Solar Panel Cleaning Perth 2026: How Often, What Damages Output, and How PES Monitors Your System

Solar panels are one of the lowest-maintenance investments you can make in your home. No moving parts, no fuel, no annual service like a ducted air conditioner or gas hot water system. But low maintenance is not the same as zero maintenance — and in Perth, a few specific environmental factors mean that doing nothing is not the right approach either.

The bigger question is: how do you know when something needs attention? Most solar owners have no reliable answer to that, because they are relying on visual checks or manually logging into a monitoring app. Positive Energy Solutions approaches this differently. Every system we install is backed by Omnidian, a dedicated performance assurance company that monitors output continuously and contacts customers directly when something needs attention.

This post covers what Perth homeowners need to know about solar panel cleaning and long-term maintenance — and how the Omnidian partnership changes what maintenance actually looks like for a Positive Energy Solutions customer.

1. Why Perth Is Different From the Rest of Australia

Perth’s solar performance stats are exceptional — more peak sunshine hours per day than any other Australian capital city, a dry Mediterranean climate, and some of the best rooftop conditions in the world. But those same conditions create a maintenance environment that is distinct from the east coast:

• Hot, dry summers with minimal rainfall: Perth’s wet season is concentrated in winter. From October through to April, most suburbs see little to no rain for weeks at a time. Without rainfall to rinse panels naturally, dust, pollen, and airborne particulates accumulate steadily across summer — exactly when output should be at its peak.
• Salt-laden coastal air: Suburbs from Cottesloe to Quinns Rocks and Rockingham to Mandurah sit in a coastal salt zone. Salt deposits on panel glass attract moisture and create a film that compounds soiling effects. Coastal panels typically need cleaning more frequently than inland properties.
• Dust from the east: Properties in the Perth Hills, Midland corridor, and semi-rural fringe see higher dust loads from easterly winds, red earth movement, and proximity to unsealed roads. Dust accumulation can be significant after a strong easterly event.
• High UV year-round: Perth’s UV index sits at extreme or very high for much of the year. Bird droppings, tree sap, and pollen that might wash off in a humid climate harden and bake onto panel glass quickly in Perth’s heat — making them harder to remove and more damaging to output.

2. How Much Does Dirt Actually Cost You?

The honest answer is: it depends on what kind of dirt, and where it sits on the panel.

General dust accumulation reduces panel output by roughly 5 to 15 percent depending on severity. For a typical 10 kW system in Perth generating around 15,000 kWh per year, a 10 percent loss is 1,500 kWh annually. At Synergy’s current rates, that is around $480 in lost savings each year.

Bird droppings are more damaging than dust, and not just in proportion to their size. A dropping that lands on part of a panel can create a hot spot — a localised area where blocked cells overheat and force other cells in the same string to compensate. This causes disproportionate output losses and, over time, can cause micro-cracking or cell damage that is not reversible with cleaning. One dropping in the wrong place can reduce a panel’s output by 30 to 40 percent until it is removed.

Shading from leaves, lichen growth, and tree sap operate similarly. Even a small obstruction on a standard panel can affect an entire string depending on how your inverter handles partial shading.

Note: SunPower P-Series panels installed by Positive Energy Solutions use a shingled cell architecture without visible busbars. The design reduces hotspot risk compared to conventional multi-busbar panels, but cleaning is still important for maintaining peak output.

3. How Positive Energy Solutions Customers Find Out About Performance Problems

The conventional answer to how do I know if my panels need cleaning is: log into your monitoring app and check your output against historical data. If it is lower than expected on a clear day, it might be time to clean.

That is a reasonable approach, but it has a significant limitation. It requires you to remember to check, know what expected output looks like for the current season, and interpret the data correctly. Most homeowners do not do this reliably, and output losses from gradual dirt accumulation are easy to miss precisely because they are gradual.

Positive Energy Solutions customers have a different arrangement. Every installation is backed by Omnidian, a dedicated performance assurance company that monitors system output continuously. Omnidian’s Resolve AI platform analyses performance data in real time, benchmarks it against weather-adjusted expected output, and flags deviations that warrant investigation.

If your system starts underperforming — whether from dirt accumulation, a failing component, a shading issue, or an inverter fault — Omnidian detects it and contacts you directly. Omnidian is your point of contact for any performance issue they identify. You do not need to notice the problem yourself or log into an app to catch it. The monitoring is happening in the background, all the time.

This is the core difference between performance monitoring as a feature and performance assurance as a service. An app tells you what your system is doing. Omnidian takes action when something is wrong.

For customers who want to actively track their own output, the best tool is your inverter monitoring portal. For Fronius GEN24 PLUS systems this is Fronius Solar.web; SigEnergy systems use the SigenStor app; iStore has its own customer portal. These portals give you a live and historical view of daily generation, self-consumption, grid export, and battery state. They are the most detailed window into your system’s performance available to you as a customer, and checking them periodically — particularly comparing the same month year on year — is a good habit. But you do not need to rely on them to catch faults. That is what Omnidian is for.

4. Cleaning Frequency — What to Expect in Perth

For most Perth residential solar installations, professional cleaning once every 12 to 18 months is sufficient to maintain peak output. However, several factors push that frequency higher:

• Coastal properties (Fremantle, Scarborough, Cottesloe, Mandurah, Rockingham): Salt accumulation is ongoing. Every 6 to 12 months is a better guide.
• Dusty or semi-rural areas (Hills, Midland, Mundaring, Byford, Ellenbrook): Clean every 6 to 12 months, or after any significant easterly dust event.
• High bird activity: If you have significant bird traffic on your roof — particularly cockatoos, magpies, or seagulls — clean more frequently.
• Panels under or near trees: Leaf drop, sap, and pollen accumulate quickly. Clean every 6 months if panels are shaded by or adjacent to trees.
• Standard suburban Perth (limestone, low bird activity, minimal trees): 12 to 18 months is generally adequate.

Because Omnidian monitors output continuously, customers will often be contacted about a performance drop before the cleaning schedule would have suggested it. If Omnidian has been in touch about underperformance, a clean is often the first recommended step.

5. DIY Cleaning — What Is Safe and What Is Not

Cleaning solar panels yourself is possible, but there are important limits on what is safe for your panels and your warranty.

What is safe:

• Rinsing panels from the ground with a standard garden hose — particularly early in the morning before panels heat up. The temperature contrast between cool water and hot glass can cause micro-cracking on lower-cost panels. However, this is generally safe for quality panels on a mild morning.
• Using a soft brush on an extendable handle with clean water, if you can reach panels safely without walking on the roof.
• Wiping individual panels with a soft, damp cloth if you have safe roof access and are physically confident doing so.

What is not safe:

• Pressure washers — the force can crack panel glass, damage seals, and force water into connections. This will void your panel warranty.
• Abrasive cleaning materials — scourers, steel wool, or gritty cleaning compounds will scratch panel glass, increasing light diffusion and reducing output permanently.
• Household cleaning chemicals, detergents, or solvents — these can leave residue and in some cases damage the anti-reflective coating on panel glass. Clean water is almost always sufficient.
• Walking on solar panels — panels are not designed to be walked on and doing so risks micro-cracking and structural damage. It will void your warranty.

For anything beyond a gentle hose-down from the ground, use a professional solar cleaning service. They carry insurance, use deionised water, and have the equipment to clean safely without voiding your warranty.

If you are unsure whether an issue is a cleaning problem or a component fault, Omnidian’s monitoring data will already indicate whether performance is below expected. If Omnidian has been in touch, follow their guidance. For warranty-related concerns, contact Positive Energy Solutions.

6. SunPower P-Series and Long-Term Performance

Positive Energy Solutions installs SunPower P-Series panels on most residential projects, and the panel’s construction has direct implications for long-term maintenance.

The P-Series uses a glass-glass construction — a tempered glass front sheet and a tempered glass rear sheet, in place of the polymer backsheet found on most conventional panels. Glass-glass panels are more resistant to moisture ingress, UV degradation, and microcracks, all of which are relevant to Perth’s environment. The construction also reduces the risk of potential-induced degradation (PID), a performance issue that can affect conventional panels in hot conditions.

SunPower’s warranted degradation rate is 0.40 percent per year maximum — the industry standard is typically 0.5 to 0.7 percent. At 0.40 percent, a Positive Energy Solutions SunPower system producing 100 percent in year one is warranted to produce at least 89.4 percent in year 25 and 87.4 percent in year 30. This is covered by a 30-year product, performance, and service warranty.

From a maintenance perspective, glass-glass construction means the panels are easier to clean safely and more likely to hold their output through their 30-year life without developing the microcrack and delamination issues that affect older technology.

The 30-year warranty also provides a clear escalation path if a panel develops a genuine performance issue that cannot be resolved by cleaning. Contact Positive Energy Solutions for any warranty-related matter — we manage the manufacturer warranty process on your behalf.

7. What Voids Your Solar Warranty

This is worth understanding clearly, because warranty terms are where DIY maintenance choices can create problems.

• Panel warranty: Most manufacturers, including SunPower, will void the product warranty if panels show evidence of physical damage caused by cleaning (pressure washing, abrasive materials, walking on panels) or unauthorised modification.
• Inverter warranty: Inverter warranties are voided by physical tampering, installation outside the manufacturer’s specified temperature and ventilation parameters, and water ingress caused by external damage.
• Workmanship warranty: Positive Energy Solutions provides a workmanship warranty covering the installation itself. Issues caused by third-party modifications or tampering with installed wiring are not covered.
• Performance warranty: SunPower’s 30-year performance warranty covers output degradation beyond the warranted rate under normal operating conditions. It does not cover output reduction caused by dirt, shading, or external damage.

If you are unsure whether a maintenance action is safe, contact Positive Energy Solutions before doing it.

8. Summary — Maintenance for a Positive Energy Solutions Customer

If you have a solar system installed by Positive Energy Solutions, your maintenance picture looks like this:

• Omnidian monitors your system output continuously. If something is wrong — whether it is dirt-related, component failure, or a grid issue — Omnidian will contact you directly. They are your point of contact for any performance issue they identify.
• For customers who want to self-monitor, your inverter portal is the best tool — Fronius Solar.web, the SigenStor app, or the iStore portal depending on your inverter. These give you the most detailed view of your generation, self-consumption, and battery data. Checking them month to month is worthwhile. But you do not need to rely on them to catch faults — Omnidian is already doing that.
• For cleaning, a professional clean every 12 to 18 months is appropriate for most Perth suburban locations. More frequently if you are coastal, dusty, or have significant bird activity. Use a qualified solar cleaning service that uses deionised water and soft equipment.
• For any warranty issue — panel, inverter, or workmanship — contact Positive Energy Solutions. We will triage the issue and manage the warranty process with the relevant manufacturer.

The goal is a system that produces at its warranted level for 25 to 30 years. With Omnidian monitoring in the background, your inverter portal available for self-tracking, and Positive Energy Solutions handling warranty matters, the ongoing management burden on you as a customer is minimal.

Talk to Positive Energy Solutions About Your System

For homeowners with a Positive Energy Solutions-installed system who have a warranty concern or a question about their installation, contact us. For performance issues flagged by monitoring, Omnidian will be in touch with you directly.

For homeowners considering a new solar or solar-plus-battery system, Positive Energy Solutions only installs systems it is prepared to stand behind — with Omnidian monitoring included as standard and the 30-year SunPower warranty backed by our own workmanship guarantee. Get in touch to discuss your home and situation.

Related guides

• North, East, or West Facing Solar Panels in Perth: Which Direction Is Best for Your Home?
• Before Your Solar Is Installed in Perth: What to Expect From Sign-Off to Installation Day
• How Much Solar Battery Storage Do I Need? Perth 2026 Guide
• How to Choose a Solar Installer in Perth: What to Look For (and What to Watch Out For)

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Frequently Asked Questions

How do I know if my solar panels need cleaning?

If your system is underperforming, Omnidian will detect it and contact you directly. For customers who want to check themselves between contacts, the best tool is your inverter monitoring portal — Fronius Solar.web, the SigenStor app, or the iStore portal. Compare your current output against the same period last year. If your system is producing noticeably less on clear sunny days than expected, cleaning is a logical first step. For coastal and dusty Perth locations, a professional clean every 6 to 12 months is a reasonable baseline regardless of what the monitoring shows.

Can I clean my solar panels with a pressure washer?

No. Pressure washers can crack panel glass, damage seals, and force water into connections — and doing so will void your panel warranty. A garden hose with a gentle spray is safe for a basic rinse from the ground. For anything more thorough, use a professional solar cleaner who uses deionised water and appropriate equipment.

Will cleaning my panels void the warranty?

Cleaning with water and a soft cloth or brush will not void your warranty. Using pressure washers, abrasive materials, or chemical solvents can void it. Walking on panels or physically modifying the array in any way also risks voiding warranty. If in doubt, contact Positive Energy Solutions before undertaking any maintenance.

Omnidian has contacted me about a performance issue — what happens next?

Omnidian is your point of contact for performance issues they identify through monitoring. They will advise on the appropriate next step, which may include recommending a professional clean, arranging technical support, or escalating a component issue. For anything related to your installation warranty, contact Positive Energy Solutions.

How long will my solar panels last with proper maintenance?

SunPower P-Series panels installed by Positive Energy Solutions are warranted to produce a minimum of 89.4 percent of their original output at year 25, and 87.4 percent at year 30, with a 0.40 percent maximum annual degradation rate. This is covered by a 30-year product, performance, and service warranty. With regular cleaning and Omnidian catching any issues early, these panels are designed to produce close to their warranted output levels throughout their 30-year life. The inverter will likely need replacement at some point in that period, but the panels themselves are built for the long run.

About the Author

Jason Wiktorowicz
Sales Manager, Positive Energy Solutions | Perth, WA

Jason has been at the centre of Western Australia’s energy transition for over a decade. As Orchestration Lead on Project Symphony — WA’s largest virtual power plant pilot — and Stream Lead on Project Encore, he worked directly with AEMO, Western Power and Energy Policy WA to shape how distributed energy resources connect and operate on the SWIS. That work included developing and rolling out CSIP-AUS, now mandatory for all new WA grid connections. He also led Emergency Solar Management (ESM), the first program of its kind in WA, VPP for Schools (VPP4S), which provided direct market benefits through Supplementary Reserve Capacity, and REBAR, the WA Residential Battery Rebate scheme.

His earlier career spanned Synergy, Infinite Energy and Curtin University’s Sustainability Policy Institute, where he co-authored peer-reviewed research on net-zero urban precincts, solar integration and peer-to-peer energy trading, published in the journal Urban Planning in 2018.

At Positive Energy Solutions, Jason leads sales with a focus on system design accuracy and long-term performance. Positive Energy Solutions installs solar and battery systems, EV chargers and heat pumps, and holds partner accreditations with Fronius, SigEnergy, iStore and SunPower. Connect with him on LinkedIn.