Solar Panel Repairs QLD 2026 - Get Free Quotes

Why Solar Repairs Are Now a Queensland Trade

Queensland took to rooftop solar earlier and harder than anywhere else in Australia, and the consequence of that head start is now arriving. Systems installed during the boom years of 2010 to 2013 are past their fifteenth summer. Inverters from that era have almost all been replaced once or are overdue. Isolator enclosures fitted in 2011 have now endured fifteen Queensland summers, and the plastics used at the time were not chosen with that in mind. Isolators have been sitting in full Queensland sun for well over a decade. The panels themselves are often still producing, but the equipment around them has aged at a very different rate.

The result is a repair market that barely existed ten years ago and is now a substantial trade in its own right. It is also a trade where the work is frequently misunderstood, because a solar system fails quietly. There is no leak, no noise and no smell. A string that has dropped out or a panel that has failed simply reduces production, and a household that is not checking its monitoring can lose a third of its output for two years without noticing anything except a power bill that crept up. By the time the bill prompts a question, two summers of generation have already gone. That is the reason a fifteen minute look at the monitoring is worth more than most maintenance.

What makes Queensland different is not only the volume of systems but the conditions they work in. Sustained heat reduces inverter and panel output and shortens component life. Coastal salt attacks aluminium mounting and steel fixings. Cyclonic wind regions across the northern coast impose mounting requirements that most of the country never has to think about. Cockatoos chew cabling with genuine enthusiasm. Hail cracks glass. Very few of these are design faults, they are simply the environment doing what it does. What separates a system that ages well from one that does not is usually the quality of the original installation instead of the brand on the panels.

There is one further complication that applies here and almost nowhere else, and it is worth reading before booking any work. A significant number of Queensland households still receive the legacy 44 cent feed in tariff, and the way a repair is carried out can permanently end that entitlement. Getting the sequence right is worth more than the repair itself. That is where this guide starts. Everything else in this guide assumes that question has already been answered.

The 44 Cent Solar Bonus Scheme and the Repair Trap

The Queensland Solar Bonus Scheme paid a feed in tariff of 44 cents per kilowatt hour to households that connected eligible rooftop solar before it closed to new applicants in 2012. It remains payable to eligible customers until 30 June 2028, which means a substantial number of Queensland homes are still receiving several times the value that a new system earns today. For those households the tariff is often worth considerably more than the electricity the system generates for their own use. It is not unusual for a small legacy system to be returning more in credits than a modern array three times its size.

Eligibility carries conditions, and the one that matters most for repairs concerns system capacity. Broadly, the entitlement is tied to the original approved inverter capacity at that premises for that customer, and increasing the capacity beyond what was originally approved generally ends the eligibility permanently. There is no reinstatement and no appeal on the basis of not having realised. This is the single most expensive mistake a Queensland household can make when arranging a solar repair. It is also entirely avoidable, since it turns on one decision made before any work begins. Nobody discovers it until the next bill arrives.

In practice the trap is set by well meaning advice. An inverter fails. The contractor points out, correctly, that a modern 5 kilowatt inverter costs barely more than a 3 kilowatt one and would let the household add panels later. The homeowner agrees because it sounds sensible. The tariff ends. Replacing a failed inverter with one of the same or lower capacity generally preserves eligibility, while going up a size generally does not, and the difference between those two decisions can run to thousands of dollars a year until 2028.

Other changes carry similar risk. Adding panels, changing the account holder in some circumstances, and moving to a different property all affect eligibility, and the rules around each are specific. Before any solar work is booked, a household on the legacy tariff should confirm the position directly with their electricity retailer and their distributor, whose answer is the one that counts. Information on the scheme is published by the Queensland Government.

Tell every contractor quoting the work that the property is on the 44 cent tariff, and put it in writing. Experienced Queensland solar electricians deal with this constantly and will quote a like for like replacement without being asked twice. A contractor who dismisses the concern or has not heard of the issue is not the right contractor for a legacy system, because the entire economics of the repair turn on it, not on the price of the inverter.

How Solar Systems Actually Fail

Failures cluster in predictable places, and they are not evenly distributed across the system. The panels themselves are the most reliable component and routinely outlast their warranty. Everything else fails earlier. Inverters are the most common single point of failure by a wide margin, followed by isolators, connectors and the wiring between them. Mounting hardware fails last but fails expensively when it does. Understanding that order helps a homeowner interpret a quote, because a contractor who leads with the panels is looking in the least likely place first.

The reason for that pattern is that panels are sealed, passive laminates with no moving parts and no electronics, while inverters contain capacitors, cooling fans and switching electronics that degrade with heat and cycling. An isolator is a mechanical switch in a plastic enclosure sitting in direct sun and driving rain for twenty years. A connector is a plastic and metal joint carrying direct current continuously through daily thermal expansion. Ranked by how hard a component's life is, the failure order makes complete sense. Nothing about it reflects poor manufacturing, and replacing an inverter at twelve years is normal, not a sign the original purchase was a mistake.

Output loss also comes in two shapes that need distinguishing. A sudden drop to zero, or a sudden drop by roughly half on a two string system, points to a discrete fault such as a failed inverter, a tripped breaker or a string that has disconnected. A slow decline over years points to degradation, soiling, shading from a grown tree, or a small number of underperforming panels dragging a string down. The two are diagnosed differently and cost very different amounts to fix. Households can usually tell which they have simply by looking at the shape of the production graph over a few years, and that observation saves a contractor an hour on site.

Age matters when setting expectations. A well built system should lose only a fraction of a per cent of panel output each year, so a fifteen year old array might reasonably produce around ninety per cent of its original figure. Anything substantially below that has a fault, not age. Households often accept poor performance as inevitable wear when the real cause is a single dead panel or a string that dropped out three summers ago.

Inverter Faults, Lifespan and Replacement

The inverter converts the direct current produced by the panels into alternating current the house and the grid can use, and it is the component most likely to need replacing during the life of a system. A typical string inverter lasts somewhere between ten and fifteen years, which is roughly half the design life of the panels it serves. Households should plan on replacing the inverter at least once, and budget for it. Treating it as a failure of the original purchase misreads what has happened. Setting aside a few hundred dollars a year against that eventual cost is a more comfortable approach than an unexpected three thousand dollar bill in a summer when the system stops.

Heat is the principal enemy. Inverters derate when they get hot, meaning they deliberately reduce output to protect themselves, and an inverter mounted on a west facing wall in full afternoon sun in Rockhampton or Townsville will both produce less and fail sooner than the same unit in shade with airflow around it. Poor siting is one of the most common installation shortcomings on older Queensland systems, and relocating an inverter into shade at the time of replacement is often worth the modest additional cost. Garages, the shaded southern side of a house and areas under eaves all work better than an exposed western wall. Ask the contractor to assess siting instead of simply refitting to the existing bracket.

Fault codes on the display or in the monitoring app are the starting point for diagnosis and are worth recording before calling anyone. Common codes point to grid voltage outside the permitted range, insulation resistance faults indicating moisture or damage in the DC wiring, isolation faults, overtemperature, and internal hardware failures. Grid voltage faults are particularly common in Queensland streets with heavy solar penetration, because when many systems export at once the local voltage rises and inverters shut down to comply with the limits set in AS/NZS 4777, the standard governing how inverters connect to the grid. These trips cluster around the middle of clear days, which is exactly when a household expects peak production.

That last point causes real frustration because the system is behaving correctly and the household still loses production. If an inverter is repeatedly tripping on grid voltage, the issue may sit with the network, not the equipment, and the distributor should be contacted. Both Energex in the southeast and Ergon Energy across regional Queensland have processes for investigating supply voltage complaints, and a documented log of trip times from the monitoring makes that conversation far more productive. Where the switchboard itself is old and the solar circuit shares space with decades of accumulated additions, a switchboard upgrade is sometimes recommended at the same time, though it should be justified on its own merits rather than bundled in without explanation.

When replacement is the answer, compatibility matters. The new inverter must suit the array's string configuration, voltage and current, must comply with current grid connection standards, and in Queensland must meet the emergency backstop requirements that apply to new and upgraded systems. Established brands including Fronius, SMA, Sungrow and GoodWE all have local support presence, which matters more than headline efficiency when a warranty claim arises five years later. Availability of parts and local technical support is the practical differentiator between brands once a system is past its first decade. Efficiency figures separated by half a per cent will not help when a unit fails and nobody can source a replacement board.

Rooftop DC Isolators and Why They Matter So Much

Australia is close to unique in having required a DC isolator to be installed on the roof next to the array, and that requirement produced an entirely predictable outcome. A plastic switch enclosure sitting on a Queensland roof endures extreme heat, ultraviolet, driving rain and thermal cycling for decades. Seals perish, water gets in, and water inside an enclosure carrying several hundred volts of direct current creates tracking, arcing and, in a meaningful number of cases, fire. The failure is slow, not sudden, which is what makes it dangerous, since a compromised isolator can sit degrading for a year before anything happens.

Rooftop isolator failure has been one of the leading causes of solar related house fires in Australia, and Queensland's climate makes it a particularly local problem. The Australian Standard covering photovoltaic array installation, AS/NZS 5033, was amended so that a rooftop DC isolator is no longer mandatory in the circumstances it once was, which reflects how much trouble the requirement caused. Standards are published by Standards Australia, and fire safety information is available from the Queensland Fire Department.

Existing systems still have these isolators and they still fail. Warning signs include visible water inside the enclosure, discolouration or browning of the plastic, a cracked or chalky lid, corrosion on the mounting screws, and any smell of burning near the array. Insulation resistance faults reported by the inverter frequently trace back to a wet isolator. Homeowners should not open one, but noticing a cracked or fogged lid from ground level with binoculars is entirely reasonable and worth doing occasionally. A photograph taken with a zoom lens gives a contractor something concrete to work from before they arrive.

Replacement is inexpensive relative to the risk, generally $250 to $600 including access, and it is one of the highest value maintenance items on an older Queensland system. Where the standard now permits it, some contractors will remove the rooftop isolator entirely rather than replace it, subject to the system meeting the relevant requirements. That decision belongs to the accredited installer assessing the specific system rather than to a general rule. Where lightning activity is a concern, which it is across much of southeast Queensland through summer, surge and lightning protection at the switchboard protects the inverter as well as the rest of the household's electronics.

Panel Faults, Microcracks and Hot Spots

Panels fail less often than everything else but they do fail, and the modes repay knowing because they are largely invisible from the ground. Microcracks in the silicon cells develop from hail impact, from thermal cycling and sometimes from careless handling during installation. They do not stop a panel working but they progressively reduce its output, and because panels in a string are wired in series, one weak panel drags the whole string down with it.

Hot spots are the more serious version of the same problem. Where a cell is shaded, cracked or has a poor connection, it stops generating and instead dissipates the energy from the rest of the string as heat. Bypass diodes are built into panels to manage this, but when they fail the affected area can reach temperatures that discolour the backsheet, the protective layer on the rear face of the panel, delaminate the laminate and, occasionally, start a fire. Thermal imaging finds hot spots quickly and is the standard diagnostic tool. It is also non invasive, which means an array can be assessed without a single panel being disturbed.

Delamination and backsheet failure show up as bubbling, cloudiness or a chalky white deterioration on the rear of the panel, and they allow moisture ingress into the laminate. Potential induced degradation is a different mechanism again, caused by voltage stress between the cells and the frame, and it can cut a panel's output substantially while leaving it looking perfectly normal. Both are age related and both tend to appear across a batch. That batch pattern is useful diagnostically, because a fault appearing on six panels installed on the same day points somewhere very different from a fault on one.

The practical difficulty with panel replacement is matching. Panel models change every couple of years, and a panel bought in 2012 is not available in 2026. A replacement must be electrically compatible with the string, meaning similar voltage and current characteristics, even if the physical size and appearance differ. Where several panels have failed and matching becomes impossible, replacing a whole string, or reconfiguring the array, is sometimes the only workable answer.

Cost per panel of $300 to $700 reflects that the labour and access dominate the figure while the panel itself is a small part of it. Replacing one panel on a single storey tin roof is a short job. Replacing one in the middle of a tile roof array on a two storey house means lifting and refitting neighbouring panels, working around fragile tiles and often reworking the mounting. Households facing several failed panels should ask whether doing them in one visit reduces the total.

Wiring, Connectors and DC Arcing

The connectors joining panels to each other and to the string cabling are a genuine and under recognised failure point. The industry standard connector type is widely referred to by a common model designation, but different manufacturers produce connectors that look identical and are not electrically compatible with each other. Mating two different brands creates a joint with poor contact pressure, which heats up, oxidises and eventually arcs. The joint often works perfectly for years before it degrades, which is why the problem surfaces long after the installer has moved on.

This matters because direct current arcs do not self extinguish the way alternating current arcs do. An AC arc breaks a hundred times a second as the waveform crosses zero. A DC arc, once established, is continuous and can sustain temperatures capable of igniting a roof. Mismatched connectors have been identified repeatedly as a cause of rooftop fires, and it is exactly the kind of shortcut that a cheap installation from a decade ago may contain.

Cable management is the other common defect on older systems. DC cabling that has been left resting on roof sheeting or tiles, rather than supported clear in UV rated conduit or properly clipped, abrades over years of thermal movement. Insulation degrades in Queensland sun faster than most installers allowed for, and once the copper is exposed the result is an earth fault at best and an arc at worst. Insulation resistance faults reported by an inverter frequently trace back to damaged cable. Faults of this kind are also weather dependent, appearing after rain and clearing as things dry out, which is a strong clue in itself. A household noticing that pattern should mention it, because it narrows the search considerably.

Any repair visit on an older array should include an inspection of connectors and cable support as well as the reported fault. It is inexpensive while someone is already on the roof and it addresses the failure that has not happened yet. Where wiring problems extend into the switchboard or the consumer mains, broader electrical fault finding may be needed to trace the issue properly.

Hail, Storm Damage and Insurance

Solar arrays sit in the most exposed position on a building and take the full force of Queensland hail. Panels are tested to withstand hail impact and generally survive smaller stones, but the large hail that southeast Queensland produces in severe thunderstorms exceeds what any panel is designed for. Damage ranges from shattered front glass, which is unmistakable, to microcracking that leaves the panel looking untouched while cutting its output. Only the first of those is visible from the ground, and the second is the more common outcome.

That second category is where claims get difficult. A homeowner may have an array that looks perfect and produces twenty per cent less than it did before the storm. Establishing that requires production data from before and after the event, and ideally electroluminescence or thermal testing that shows the crack pattern. Households with monitoring should download or screenshot their production history after any significant hail event, because that record is the evidence. Insurers and manufacturers both work from data, and production history is the only thing that shows a change objectively. It costs nothing and takes a minute.

Wind damage is the other storm mode and it usually presents at the mounting. Uplift under an array works at the clamps, the rails and the roof fixings, and a partially loosened array will move and wear before it ever detaches. Anything that has shifted needs proper reinstatement, not retightening, because the roof penetrations underneath have almost certainly been compromised. Water entering through a disturbed mounting foot runs into the roof space where nobody sees it until a ceiling stains.

Most home building policies include rooftop solar within the building sum insured, though some treat it as a specified item and a few exclude it, so confirming the position is worthwhile before an event. Damage that forms part of a wider storm claim should be scoped alongside the roof itself, and general roof repairs and solar reinstatement are far cheaper coordinated than done as two separate jobs months apart. The same applies to guttering, since a gutter replacement is easier arranged while roof trades are already engaged. Ask the insurer to include both in one scope.

Mounting, Wind Regions and Cyclonic Areas

An array is a large flat surface bolted to a roof, and in wind terms it behaves like a sail. Queensland spans several wind regions under AS/NZS 1170.2, with inland areas in Region A, the southeast coastal strip in Region B and the cyclonic coastal areas of the north in Region C. Design wind pressures increase sharply across those regions, and mounting adequate for a Brisbane roof is not adequate for a Townsville or Cairns roof.

In cyclonic regions the requirements affect rail spacing, the number and type of roof attachments, the clamps holding panels to rails, and the way loads are transferred into the roof structure as well as the sheeting. Systems installed by operators unfamiliar with cyclonic requirements, which happened during the boom, may be under fixed for the location. A repair visit is the right moment to have the mounting assessed. Owners north of Rockhampton in particular should ask the question directly.

Roof penetrations are the associated problem. Every mounting foot passes through the roof covering, and every one is a potential leak. On tile roofs the brackets sit under lifted tiles and can crack them or block water paths. On metal roofs the fixings must land in the battens or purlins beneath, the structural members the roofing is fixed to, with correct sealing washers. Leaks that appear near an array years after installation are usually mounting related, and diagnosing them means lifting panels, which is why they cost more than an ordinary roof leak.

Where a roof is nearing the end of its own life, the sequence matters. Removing and refitting an array to allow a roof restoration or a full re roof is a substantial cost, so doing the roof work first, or coordinating both in one program, saves paying for the array to come off twice. A roof that needs replacing within five years should be dealt with before, not after, any significant solar expenditure. A general roofing services assessment at the same time as a solar inspection costs little and often changes the sequence of what gets done first.

Cockatoos, Possums and What Lives Under an Array

The gap between an array and the roof is warm, dry, sheltered from rain and hidden from predators, which makes it close to ideal habitat. Pigeons and mynas nest there in large numbers across Brisbane and the coastal cities. Possums use it as a run. Rats and mice follow. The accumulated nesting material, droppings and debris blocks airflow under the panels, which raises operating temperature and reduces output, and it corrodes fixings over time. It also creates a fire load directly beneath live DC cabling, which is the part most households have not considered.

Cockatoos are a specifically Australian problem and they cause genuine damage. They chew cabling, conduit and the plastic components of the mounting system, apparently for the sake of it, and a chewed DC cable on a roof is both an output problem and a fire risk. Damage of this kind is common enough across regional and outer suburban Queensland that any fault investigation on an affected property should include a look at cable condition.

Prevention is straightforward and reasonably priced. Mesh skirting fitted around the array perimeter closes the gap without restricting the airflow that panels need underneath them, and it prevents access for birds and most mammals. It has to be fitted properly with clips that do not damage the panel frames or void warranties, which is why it is worth having done by someone experienced with arrays rather than improvised. Related work sits within bird control and proofing, and where possums are established in the roof space as well, possum removal and proofing deals with the wider problem.

Cleaning out under an array is unpleasant work and needs doing before any mesh goes on, or the problem is simply sealed in. Accumulated droppings are a health consideration as well as a nuisance and should be handled with appropriate protection. Ongoing pest control around the property reduces the pressure, though the physical barrier is what actually solves it. Once mesh is fitted the maintenance burden drops sharply, and it is one of the few solar interventions that pays for itself in both output and avoided damage.

Heat, Dust, Salt and the Queensland Environment

Panels are rated under standard test conditions at a cell temperature of twenty five degrees, which bears no resemblance to a Queensland roof in February. Real cell temperatures on a summer afternoon commonly exceed sixty degrees, and output falls as temperature rises. This is why a system often produces its highest instantaneous figures on a clear, cool, windy day in winter than at the height of summer, which surprises households who assume more heat means more power.

Airflow beneath the panels is what keeps them as cool as they can be, and anything that blocks it costs output. Nesting material, debris, an array mounted too tightly to the roof, or panels installed flush on a low pitch with no ventilation all raise operating temperature. It is a modest effect on any given day and a meaningful one across a year. Roof space temperature plays a part too, and improving roof ventilation reduces the heat load on the building generally even though it does not directly cool the panels.

Soiling matters more in Queensland than the marketing suggests. Coastal salt film, red dust in the west and centre, pollen in spring, ash after burning off and bird droppings all reduce transmission through the glass. Rain removes some of it but not evenly, and a panel with a build up along the lower edge where water runs off can lose several per cent. Systems on low pitch roofs self clean far less effectively than steep ones. Households in the western and central regions who see red dust events should expect to clean more often than the coastal average suggests.

Salt corrosion is the coastal specific issue and it attacks the aluminium framing and rails, the stainless and galvanised fixings, and the earthing connections. Dissimilar metals in contact accelerate it. On a beachfront property in the north this can materially shorten mounting life, and any repair inspection within a few kilometres of the coast should include a look at the condition of the fixings as well as the electrical components. Corroded earthing connections are a particular concern because they compromise safety, not just performance. This is the sort of finding that never appears unless someone specifically looks for it.

The Roof Underneath an Ageing Array

An array installed in 2012 has spent well over a decade shielding one section of roof from the sun while the rest weathered normally. That is not entirely a bad thing, since the covered area is protected from ultraviolet, but it creates an awkward situation when the roof itself reaches the end of its life. The area under the panels is often in better condition than the surrounding roof, and the difference can be visually obvious once panels come off. Homeowners are frequently surprised by how sharply the protected rectangle stands out against the weathered roof around it.

The more pressing issue is that nobody has inspected the roof under the array in all that time. Rusting screws and washers, corroded metal sheeting, cracked tiles, deteriorated sarking, the foil membrane laid under the roof covering, and mounting penetrations that have begun to leak are all invisible until the panels are removed. On tile roofs this can be significant, since brackets installed under tiles frequently crack them, and a cracked tile under a panel leaks into the roof space where nobody sees it.

Any repair job that involves lifting panels is therefore an opportunity worth taking. Ask the contractor to photograph the roof surface underneath while it is exposed, which costs nothing and produces a record. If damage is found, addressing it while access is available is dramatically cheaper than removing the array again later. Where roof plumbing is involved, coordinating with a licensed roof plumber for roof and gutter plumbing work makes sense at the same visit. Doing so avoids the situation where a solar contractor and a roof plumber each attribute a leak to the other's work.

Gutters below an array also deserve a look. Debris that has washed off the panels, and nesting material displaced from underneath them, ends up in the gutter and blocks it, which in a Queensland downpour pushes water back under the roof edge. Routine gutter cleaning matters more on a house with solar than on one without.

How Faults Are Diagnosed Properly

A competent solar fault investigation follows a sequence rather than jumping to a conclusion, and understanding that sequence helps a homeowner judge whether the person on site is doing the job. It begins with the monitoring data, which shows when production changed and by how much. A step change on a specific date points to a discrete event. A gradual decline points to degradation or soiling. A daily pattern that dips in the middle of the day suggests heat derating or a voltage problem. Reading that shape correctly usually costs nothing and narrows the possibilities before anyone gets on a ladder.

From there the inverter is interrogated for logged fault codes, which most units store even when they appear to be running normally. String voltages and currents are measured at the inverter and compared to what the array should be producing in the conditions on the day, and a string reading well below its partner immediately narrows the search. Insulation resistance testing identifies moisture or damage in the DC wiring, which is one of the most common findings on older Queensland systems. These measurements take an experienced contractor perhaps thirty minutes and eliminate most of the possible causes.

On the roof, thermal imaging identifies hot spots, failed bypass diodes and poor connections quickly, and it works without disturbing anything. Current voltage curve tracing, a test that plots what a string produces across its full operating range, characterises each string's actual performance against its expected curve and identifies underperforming panels precisely. Not every contractor carries this gear, and for a straightforward fault it is not required, but for an array that underperforms without an obvious cause it is what actually finds the answer. Ask in advance whether the contractor has thermal imaging available, since a second visit with the right equipment costs another callout.

A written report should follow, setting out what was tested, what was measured, what was found and what is recommended. This matters for warranty claims, for insurance and for getting comparable quotes on the remedial work. A verbal diagnosis and a figure is not the same thing, particularly when a manufacturer will require evidence before honouring a warranty.

Households can do useful preliminary work themselves at no cost. Check the monitoring history and note when production changed. Check whether the inverter display shows a fault code and photograph it. Check the switchboard for a tripped breaker, since a solar circuit breaker that has tripped is a surprisingly common cause of a system apparently dying. Note whether a tree has grown into the array's morning or afternoon sun, because shading is a genuine cause that no amount of testing will fix.

Monitoring, Output and Knowing Something Is Wrong

The most valuable thing a Queensland solar household can do is actually look at the monitoring, and most do not. Systems installed before around 2015 often have no useful monitoring at all beyond a display on the inverter itself, which means the only visible symptom of a fault is a higher electricity bill several months later. Adding monitoring to an older system, or replacing an inverter with one that includes it, changes the entire maintenance picture. Modern inverters include it as standard and report to an app, which turns a decade of guesswork into a daily number. For a household that has never had visibility, that alone often justifies part of the replacement cost.

Knowing what to expect is the other half. A rough rule for Queensland is that a well sited system produces somewhere around four to five kilowatt hours per day for each kilowatt of installed capacity when averaged across the year, with substantial seasonal variation and meaningful differences between the southeast and the tropical north. A 6.6 kilowatt system averaging well under twenty five kilowatt hours a day across a year is worth investigating. Treat the figure as a prompt to look, not a diagnosis, since orientation and shading vary enormously between properties.

Comparing against the system's own history is more reliable than any rule of thumb. Production this March against production last March, and the March before that, controls for orientation, shading and local conditions in a way that generic figures cannot. A year on year drop of more than a few per cent is a fault, not normal degradation. Screenshot the comparison before calling anyone, because it is the single most useful piece of evidence a contractor can be handed.

Bills tell the story late but they do tell it. A household whose electricity costs have risen without any change in consumption habits, and which has rooftop solar, should check the system before assuming the retailer has raised prices. This is a particularly common pattern where one string of a two string system has dropped out, since the system still produces, still shows normal looking figures on a casual glance, and delivers half of what it should. Households with electric hot water or a pool pump feel it first, because those loads were being covered by the generation that has quietly disappeared.

Licensing, Accreditation and Who Can Legally Do the Work

Every part of a grid connected solar system is electrical work under Queensland law. Work on the DC side, the inverter and the AC connection must be carried out by a person holding an electrical work licence, and the contracting must be done by a licensed electrical contractor under the Electrical Safety Act 2002. There is no homeowner exemption, and the voltages involved on the DC side of a modern array are substantially higher than household mains. Insurance is the other consideration, since unlicensed work on a system can compromise a claim if a fire follows.

Accreditation is a separate requirement layered on top of licensing. Installer accreditation for small scale renewable systems transferred from the Clean Energy Council to Solar Accreditation Australia in 2024, and an accredited installer is required where the work affects the accredited installation itself, including the design and install of a new or replacement system that claims small scale technology certificates. Many households still search for the older term, so contractors advertise both. Either description is fine provided the accreditation is current, and the register can be checked.

The practical distinction matters when comparing quotes. A licensed electrician without solar accreditation can lawfully carry out some electrical work associated with a system, but replacing an inverter or reconfiguring an array in a way that requires accreditation is a different matter, and getting it wrong can affect both compliance and the ability to claim certificates. Ask directly whether the person attending holds current accreditation as well as an electrical licence. Some larger businesses send a licensed electrician for diagnostics and an accredited installer for the work itself, which is a perfectly reasonable arrangement provided it is explained. What matters is that the right person does the right part of the job.

On completion of prescribed electrical work the contractor must provide a Certificate of Testing and Compliance. Keep it. Along with the original installation paperwork, the inverter serial numbers and any warranty documents, it forms the record that a future warranty claim, insurance claim or property sale will rely on. Where a system's original paperwork has been lost, a full electrical safety inspection at the time of repair re establishes a documented baseline.

Network Connection Rules and Emergency Backstop

A grid connected system operates under a connection agreement with the distributor, and changes to the system generally have to be notified or approved. Replacing an inverter with an equivalent unit is usually a straightforward notification, while changing capacity, adding panels or adding a battery typically requires an application and may be subject to export limits in areas where the local network is constrained. That application process takes time, and a household expecting a same week turnaround on a capacity change is usually disappointed. Ask about lead times early.

Queensland introduced emergency backstop requirements applying to new and upgraded inverter systems, requiring them to be capable of remote disconnection and reconnection so the network operator can manage minimum demand conditions. In practical terms this means a replacement inverter must be a compliant model and must be commissioned with the required communications capability, which is one reason a like for like swap of a decade old unit is not simply a matter of unbolting one box and bolting on another. The commissioning step is where much of the labour sits, and a quote that looks unusually cheap has sometimes skipped it. Compliance failures found later are the household's problem, not the contractor's.

Export limits are the other consideration, and they vary by location and network capacity. Some areas allow full export, others impose a limit, and some newer arrangements use flexible or dynamic export that varies with network conditions. A contractor should establish what applies at the address before quoting, because it affects both the equipment selected and the economics the household is expecting. Two neighbouring streets can have different limits depending on where the local transformer sits.

None of this is something a homeowner needs to manage personally, but it is something to confirm the contractor is managing. Ask who is lodging the application or notification with the distributor and whether that is included in the price. A system reconnected without the required notification creates a compliance problem that surfaces at the worst possible time.

Warranties, Insolvent Installers and Consumer Rights

Solar warranties come in three distinct layers that are regularly confused. The product warranty covers the physical panel or inverter against defect, typically ten to fifteen years on panels and five to ten on inverters, sometimes extendable. The performance warranty is separate and applies only to panels, guaranteeing that output will not fall below a stated percentage over twenty five years. The workmanship warranty is provided by the installer and covers the installation itself. Households routinely believe they hold a single twenty five year warranty when they actually hold three of very different durations and reliability.

The layer that fails most often is the installer's. Solar retail has seen a very high rate of business failure in Australia, and a workmanship warranty is only as good as the company standing behind it. Households who paid for a twenty five year warranty from a business that no longer exists frequently discover that the manufacturer will honour the product warranty but nobody will pay the labour to diagnose the fault, remove the failed part and fit the replacement.

Understand that before a repair rather than during one. Where a panel or inverter is still within its product warranty, the manufacturer or their Australian distributor will often supply a replacement free of charge while the household pays for the labour, which is why a $1,500 to $3,500 inverter replacement figure may drop substantially if the unit is covered. Any contractor attending should be asked to identify the make, model and serial number and check warranty status before quoting a full replacement.

Statutory consumer guarantees under Australian Consumer Law apply alongside any express warranty and are not limited by it. Goods must be of acceptable quality and reasonably durable, and a panel that fails at eight years against a twenty five year performance warranty may give rise to a remedy even where the express warranty process is difficult. Consumer guarantee information is published by the Australian Competition and Consumer Commission, and consumer complaints in Queensland are handled through the Office of Fair Trading.

Keep the original documentation somewhere it will survive. Manufacturer warranty claims routinely require proof of purchase, the original installation date, serial numbers and evidence that the system was installed by an accredited installer. Households who cannot produce those documents are in a much weaker position, and reconstructing them a decade later is often impossible. Scan everything and store it somewhere other than a drawer in the house, since the paperwork needs to outlast several changes of phone and computer.

Repairing an Old System Versus Replacing It

There comes a point where continuing to repair a fifteen year old system stops making sense, and the calculation is more nuanced in Queensland than elsewhere because of the legacy tariff. For a household not on the 44 cent tariff the arithmetic is ordinary. Weigh the repair cost against the remaining useful life, the current output, and what a new system of appropriate size would cost and produce. A three thousand dollar inverter on a 1.5 kilowatt array is rarely defensible, while the same inverter on a sound 6.6 kilowatt array usually is.

Older systems were typically small, often 1.5 kilowatts, because that was what the rebates of the day supported. A system that size on a modern household with air conditioning, a pool pump and possibly an electric vehicle covers a small fraction of consumption. Replacing it with a larger modern array frequently makes obvious sense on output alone, and it opens the door to a battery or to EV charger installation that a tiny legacy system cannot support. Households considering an electric vehicle should factor that in, since charging demand changes the sizing calculation substantially. At that point the job has stopped being a repair and should be scoped as solar panel installation, with its own design, accreditation and network approval steps.

For a household still receiving 44 cents, the arithmetic inverts completely. Keeping a small old system alive until the scheme ends in 2028 can be worth far more than the additional generation a new system would provide, because the tariff paid on exported energy dwarfs current rates. In that situation repairing instead of replacing is usually the right financial decision, even for repairs that would otherwise look uneconomic on a system that age. Run the numbers to 30 June 2028 rather than to the end of the current bill, because that is the horizon the decision actually sits on. Many households find the answer changes completely once they do.

Panel availability is the practical constraint on repairing very old systems. If several panels have failed and no electrically compatible replacement can be sourced, the choice narrows to reconfiguring the array or replacing it. Contractors who work on legacy systems often hold stock of older panels for exactly this reason, and it is worth asking specifically whether a contractor keeps compatible stock before assuming replacement is the only option. A contractor who works mainly on new installations may not, while a repair focused business often will.

Cleaning, Maintenance and What Actually Helps

Panels do need occasional cleaning in Queensland, more so on low pitch roofs, in coastal and dusty areas, and where birds are active. The output gain from cleaning a genuinely dirty array can be several per cent, which is real but modest, and cleaning a lightly soiled array achieves close to nothing. Sensible practice is to clean when there is visible soiling. Booking an annual clean on a steep roof in a clean area is money spent on very little.

Method matters more than frequency. Panels are cleaned with water and a soft brush or squeegee, ideally early in the morning while the glass is cool, since cold water on hot glass risks thermal shock. High pressure washing is not appropriate and can force water past the frame seals, so the equipment used for pressure cleaning driveways has no place on an array. Abrasive pads, detergents and anything that could scratch the anti reflective coating should be avoided entirely.

Nobody should walk on panels. The glass is strong in the middle of a supported panel and not strong at all elsewhere, and standing on one commonly causes the microcracking that reduces output invisibly. Roof work is height safety work regardless of the reason for being up there, and the risks are set out by WorkSafe Queensland. For most households the sensible answer is to have cleaning done as part of a periodic service visit rather than attempted from a domestic ladder.

A periodic professional service typically covers visual inspection of panels, frames and mounting, checking isolators and enclosures, testing string performance, checking the inverter and its cooling, inspecting cable support and connectors, and verifying earthing. On a Queensland system a check every two to three years is reasonable, more often near the coast or where birds are active. Pairing it with other roof access work, such as gutter cleaning, spreads the cost of getting someone up there safely. It is not glamorous work and it prevents the two failures that actually cost money. It is not glamorous work and it prevents the two failures that actually cost money, which are fire risk and years of unnoticed underproduction.

Safety and Why This Is Not a DIY Job

A solar array behaves unlike any other circuit in a house, and the difference catches people out. The panels generate direct current whenever daylight falls on them, regardless of whether the system is switched off at the inverter, at the switchboard or at the main switch. Isolating the AC side makes the house side safe and does nothing at all to the array or the DC cabling running from it. Many homeowners assume flicking the main switch has made the roof safe, and it has not.

Array voltages on a residential system commonly run to several hundred volts DC and can approach a thousand on larger installations, which is well above household mains and considerably less forgiving. Direct current at that level does not let go the way alternating current does, and a DC arc does not self extinguish. This is why the work is licensed and why there is no small job on a solar system that is reasonable to attempt personally.

After storm damage the position is more serious again. Panels with broken glass, exposed cells or torn cabling should be treated as live and left alone. Isolate at both the AC and DC isolators if they can be reached safely from ground level or a secure position, do not hose the array, and do not attempt to move or secure panels that have partly detached. Where a fire, smoke or burning smell is involved, the AC supply should be isolated and emergency services called rather than anyone investigating. Firefighters attending a house with solar treat the array as energised for exactly this reason, and telling them a system is present matters. An emergency electrician is the appropriate follow up once the immediate situation is controlled.

The reasonable homeowner tasks are all off the roof. Reading the monitoring, photographing fault codes, checking the switchboard breaker, looking at the array through binoculars for obvious damage or a fogged isolator lid, and keeping records. Everything above the gutter line belongs to a licensed contractor with appropriate height safety equipment.

What to Look Out For

The first thing to watch is any contractor who proposes replacing the whole system before diagnosing the fault. Full replacement is a larger sale than a repair, and a proportion of doorknocking and cold calling solar operators lead with it. A system that has stopped producing frequently has a single failed component, and the diagnosis should come before the recommendation. Ask what testing was carried out before the recommendation was formed, and expect a specific answer.

On a legacy tariff property, watch for any suggestion to increase capacity. It bears repeating, because it is the most costly error available and it is usually made in good faith by someone who does not know the household's tariff status. Say it explicitly, get the like for like commitment in writing, and confirm the inverter capacity being installed matches or is below the original.

Be cautious of quotes that do not identify the actual fault. A price to replace an inverter is meaningful. A price to make the system work again is not, because it says nothing about what will happen when the inverter turns out to be fine and the problem is a wet isolator. Ask what testing was done and what the measurements showed. A contractor who has genuinely tested will have numbers, and one who has not will have adjectives.

Check that warranty status has been investigated before a replacement is quoted. Panels and inverters carry long product warranties and a household should not be paying full price for a component the manufacturer would supply free. A contractor who has not looked at the serial numbers has not done that check. Serial numbers are on the panel frames and the inverter label, and photographing them takes a minute.

Finally, be alert to work that leaves the roof worse than it found it. Panels lifted and refitted on a tile roof frequently crack tiles, and mounting disturbed and refitted can compromise flashing and sealing. Ask what the contractor's position is on roof damage arising from the work, and ask for photographs of the roof surface under any panels that were removed.

How to Get Useful Quotes

Give the contractor the information that lets them price accurately, and most of it is available without anyone leaving the ground. State the system size in kilowatts if known, the approximate installation year, the inverter make and model from the label, the number of panels, the roof type and pitch, and the number of storeys. Photograph the inverter display including any fault code, and the switchboard, and include them with the job. A photograph of the array from the ground, showing the roof type, pitch and how many panels there are, is worth several paragraphs of description.

Describe the symptom and leave the diagnosis to them. There is a real difference between a system showing zero output, a system producing about half of what it used to, and a system that trips out in the middle of sunny days and recovers later. Each points at a different cause, and describing the pattern accurately gets the right contractor with the right equipment on the first visit. Note when the change happened as precisely as you can, since a date lines up against weather events, storms and network work.

State the tariff position explicitly. Write that the property receives the 44 cent Solar Bonus Scheme tariff, or that it does not, because it changes the entire approach to the repair. Include whether the original installer is still trading and whether the original paperwork exists, since both affect the warranty avenue. If the paperwork is gone, say so rather than leaving it unmentioned, because it changes what the contractor needs to establish on site.

Ask each quote to separate the diagnostic fee from the repair, to say whether the diagnostic is credited against the work, and to confirm whether warranty status will be checked before any component is replaced. Ask whether the price includes any distributor notification or application required, and whether a Certificate of Testing and Compliance and a written test report will be provided. Both should be standard inclusions, and a quote that omits them is not comparable with one that includes them.

Confirm the licence and accreditation position directly. Ask for the electrical contractor licence number and whether the attending person holds current solar accreditation, and check rather than assume. On a system that will be repaired rather than replaced, ask what the workmanship warranty covers and for how long, and get it in writing alongside the scope rather than as a verbal assurance on the day.

Rental Properties, Body Corporate and Selling

In a rental property the solar system is part of the premises and the lessor is responsible for maintaining it in good repair. Tenants who notice a system has stopped producing should report it in writing, and lessors have a genuine incentive to act promptly since a non functioning system reduces the property's appeal and, where the tenant benefits from the generation, may affect the tenancy arrangement. Queensland residential tenancy law provides the framework for both parties. Lessors should also keep the compliance and warranty paperwork accessible, since a managing agent arranging repairs will need it.

Body corporate properties raise the question of who owns the roof. In most community titles schemes the roof is common property, which means an array bolted to it required authorisation to be installed there and its repair may be a body corporate matter, not a lot owner's. Where a lot owner installed the system under an exclusive use arrangement or a by law, the terms of that arrangement usually determine responsibility for maintenance. Reading the by law before commissioning a repair avoids the awkward situation of an owner paying for work on common property. Committees can usually clarify it quickly.

Selling a property with solar brings its own considerations. Buyers increasingly ask about system age, output, warranty status and whether the paperwork exists, and a system that has not worked properly for two years is a negotiating point, not a selling feature. Having a recent service report and a documented production history is worth more than a vague assurance that the system is fine. A system with current monitoring and a clean test report is a genuine asset in a listing.

Sellers on the 44 cent tariff should be aware that the entitlement does not transfer with the property, so it should not be represented to a buyer as an ongoing benefit. This is a straightforward disclosure point and getting it wrong creates a real dispute. Buyers looking at a property with an older array should treat the system's condition as an inspection item alongside the roof, and factor a possible inverter replacement into their expectations. Adding a solar health check to the pre purchase inspection costs a few hundred dollars and occasionally saves several thousand.