Solar Panel Dust & Soiling Loss Calculator (Australia)
Estimate annual energy lost to red dust, salt spray and ash on Australian solar panels. Calculates baseline soiling loss, kWh recovered by cleaning, and whether a paid clean pays back at your feed-in tariff.
Solar Panel Dust & Soiling Loss Calculator
Baseline (no cleaning)
2.5 %
Avg soiling loss
2.1 %
Energy recovered
35 kWh
Annual value recovered
$11
Net annual benefit
-$429
Recommended cleanings/year
0
How to use this calculator
Enter eight inputs and the calculator returns the baseline annual soiling loss with no manual cleaning, the average loss with your chosen cleaning frequency, the kWh recovered, the A$ value of that energy, the net benefit after paying for the cleanings, and the cleaning frequency that maximises net benefit.
- System size (kW) — DC nameplate. Typical Australian residential system is 6.6 kW (the STC sweet spot) or 10 kW.
- Annual generation (kWh) — actual or modelled. Pull from your inverter app, your AGL/Origin/Synergy meter data, or the Clean Energy Regulator’s PVGEM tool. Brisbane yields 1,500–1,700 kWh per kW; Hobart 1,000–1,200.
- Array tilt (°) — fixed-tilt angle. Most Australian roofs are 22°–30°; flat commercial systems sit at 10°.
- Electricity rate (A$/kWh) — your blended import + feed-in value. 2026 NSW/VIC/SA averages A$0.30–A$0.40/kWh import, A$0.05–A$0.10/kWh feed-in. Use a weighted average if you export much.
- Soiling environment — pick the preset matching your site (coastal “light”, suburban “moderate”, farming/rural “high”, mining/inland arid “severe”).
- Rain-clean events/year (≥5 mm) — count of meaningful rain storms from BoM data. Sydney 25–35; Brisbane 30–40; Perth 30–40; Adelaide 25–30; Melbourne 30–35; Hobart 45–60; Darwin 60–80 (wet season concentrated); Alice Springs 8–15.
- Manual cleanings/year — your cleaning frequency.
- Cost per clean (A$) — typical Hipages or Service.com.au cleaner charges A$120–A$300 for residential.
Why Australian soiling is different
Australia has the most varied PV soiling environment of any developed market:
- Mining and arid inland sites (Pilbara, Goldfields, Mt Isa, central NT) — among the world’s highest soiling rates. ARENA DeGrussa data shows 0.4–0.6%/day in dry season.
- Wheat and sheep belt (Wimmera, Mallee, WA wheatbelt, Riverina) — high seasonal dust during harvest (Oct–Dec).
- Coastal urban (Sydney, Brisbane, Gold Coast, Perth, Adelaide) — salt aerosol forms a sticky film that doesn’t fully rinse off in light rain.
- Cyclone/monsoon north (Darwin, Cairns, Townsville) — heavy seasonal soiling in dry season; intense washing in wet season.
- Cool-temperate south (Hobart, southern VIC, Tassie) — low soiling, frequent rain.
- Bushfire ash — episodic spikes across south-eastern Australia in summer.
The Clean Energy Council’s Solar Accreditation maintenance guide and CSIRO Energy’s PV Performance Modelling reports calibrate these zones for installers.
The Australian feed-in tariff problem
Soiling cleaning ROI in Australia is heavily skewed by your self-consumption ratio:
- High self-consumption (battery, EV, pool pump, day-active household) — every recovered kWh is worth your full A$0.30–A$0.40/kWh import rate. Cleaning pays back fast.
- Low self-consumption (export-heavy, no battery, working household) — every recovered kWh is worth only your A$0.05–A$0.10/kWh feed-in. Paid cleaning rarely pays back unless soiling is severe.
For most NSW/VIC/QLD/SA households with 30–50% self-consumption ratios, the blended value of a recovered kWh is around A$0.15–A$0.20. Plug that into the calculator and the recommendation usually drops to 0–1 cleanings/year for suburban sites, 2 for rural.
Cleaning costs and providers
| Service tier | Typical A$ cost | What you get |
|---|---|---|
| DIY rinse | A$50 one-off (water-fed pole) | Effective for pollen, salt haze, light dust |
| Hipages handyman | A$120–A$200 per visit | One-storey residential, soft brush + DI water |
| Solar-specialist firm | A$250–A$400 per visit | Includes IR scan, junction-box check, performance report |
| Commercial robotic | A$0.01–0.03 per W/year ongoing | For commercial / farm-scale arrays |
Hipages, Service.com.au, Oneflare and TaskRabbit Australia are the main residential channels. Solar-specialist firms (Sunboost Solar Cleaning, SunClean, Australian Solar Cleaning) operate in capital cities and major regional centres.
Cleaning safety and warranty
- AS/NZS 1891 fall-protection applies to any roof work above 2 m. WorkSafe state regulators (SafeWork NSW, WorkSafe VIC, etc.) enforce this on paid contractors.
- Walking on modules voids most CEC-listed module warranties (Jinko, Trina, REC, JA Solar, Q-Cells). Use the water-fed pole from a roof walkway or from ground level.
- Pressure washers void warranties and can crack module glass during thermal mismatch. Cap pressure at 50 bar (700 psi); most warranty terms cap at 30 bar.
- Hot-module cleaning can thermally shock glass. Clean early morning or late evening, never on a hot module in direct sun.
Bushfire-ash protocol
After a significant fire event affecting your area:
- Wait until ambient air quality returns to AQI under 100.
- Within 30 days, perform a single rinse with rainwater or DI water. Do not let alkaline ash sit through humid weather.
- Inspect for visible cracks in module glass — falling ash containing burning embers can crack modules.
- Reset your inverter performance baseline; if generation hasn’t recovered to within 95% of pre-event levels, get a professional IR scan.
This is per Clean Energy Council and Fire and Rescue NSW post-disaster guidance after the 2019–20 Black Summer fires.
Sources
- Clean Energy Council — Solar PV Maintenance Guide — installer and owner maintenance standards.
- CSIRO — PV Performance Modelling — Australian soiling rate calibration data.
- ARENA — DeGrussa Solar PV Project Report — high-soiling mining-camp case study.
- Bureau of Meteorology — Climate Data Online — rainfall event data.
- Australian Energy Regulator — Default Market Offer — current retail electricity rates.
- Hipages & Service.com.au — Solar Panel Cleaning Listings — current Australian cleaning labour rates.
Frequently asked questions
How much do Australian solar panels lose to dust?
CSIRO and UNSW Tyree Energy Technologies Building monitoring (2018–2023) measured 2–8% average annual soiling loss across Australian rooftops, with rural inland sites in the Mallee, Riverina, Pilbara and central Queensland reaching 10–15%. Clean Energy Council guidance to installers notes that bushfire-ash years (2019–20, 2024–25) add 3–6% one-off loss across south-eastern Australia. Coastal Sydney and the Gold Coast sit around 3–5% due to salt aerosol and pollen, while Hobart and Tasmanian sites are typically 1.5–2.5% with regular winter rain.
When does professional cleaning pay back in Australia?
Use the calculator's net-benefit output. Rules of thumb at 2026 retail rates of A$0.30–A$0.40/kWh (NSW, VIC, SA) and feed-in tariffs of A$0.04–A$0.10/kWh: rural farm systems within 500 m of unsealed roads, harvest activity or red-dirt paddocks typically justify 2 cleans/year. Suburban systems in coastal Sydney, Brisbane, Adelaide and Perth typically justify 1 clean/year for the salt-haze layer. Tasmanian and inner-Melbourne systems usually don't justify any paid cleaning at all — rain handles it. The lever is your self-consumption ratio: if you export most generation, paid cleaning rarely pays back at FiT rates.
Will a Pilbara mining-camp PV system actually lose 15% to dust?
Yes — and routine weekly cleaning is standard at FMG, BHP, and Rio Tinto remote-camp PV+diesel hybrid systems. The Australian Renewable Energy Agency (ARENA) DeGrussa and Sandfire case studies show that without cleaning, soiling losses can reach 18–25% in the dry season. With automated robotic cleaners (Ecoppia or Solar Cleano) deployed daily, losses stay under 3%. Residential analogues are sheep stations and grain farms inland of Dubbo, Mildura, Mount Gambier and Geraldton — annual paid cleaning makes economic sense at those sites.
Can I clean my own panels safely on an Australian roof?
Yes for single-storey homes with safe roof access. Use a soft brush, a fibreglass water-fed pole, and rainwater or filtered water (Australian tap water often has high mineral content that leaves residue). Avoid pressure washers (void Clean Energy Council–compliant warranties from Trina, Jinko, REC, Q-Cells). For two-storey, steep pitch (>30°), or any system where you'd need to walk on the modules, WorkSafe Working at Heights regulations apply — hire a professional. Typical Hipages or Service.com.au cleaner charges A$120–A$300 per visit for residential, depending on system size and access.
Does the calculator account for bushfire ash?
Not directly — bushfire ash is treated as a temporary 'severe' environment for the affected months. After a major fire-season ash deposition, do one cleaning rinse to remove the alkaline ash layer (which can etch glass anti-reflective coatings if left through humid weather). The Clean Energy Council recommends a single rinse with rainwater within 30 days of a heavy ash event, regardless of normal cleaning schedule. The calculator's 'severe' preset over-estimates non-ash-year soiling for most NSW/VIC/SA homes — use 'high' instead and add a one-off clean if there's been a regional fire.