Panel cleaning ROI calculator

Dust, sand and dirt quietly steal energy from your panels every day. This calculator estimates your losses and shows whether scheduled cleaning pays for itself.

Your total installed solar capacity.

Average daily peak sun hours where you live (4.5–6.5 in most sunny regions).

What each kWh from the grid costs you.

Typical 5–15% in mild climates, 20–30% in sandy or desert areas between cleanings.

Professional service price, or zero if you clean it yourself.

How often the system gets cleaned.

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Lost energy per year (kWh)
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Lost money per year ($)
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Cleaning cost per year ($)
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Net benefit vs cleaning ($/yr)

What the calculator measures

Dust settles on panels and blocks light. The loss depends on your environment: mild climates see 5–15% losses, while sandy and desert areas can reach 20–30%. Regular cleaning recovers most of that energy — the question is whether the recovered value beats the cleaning bill.

Clean panel 100% output Dusty panel loss

Annual recovery vs cleaning cost

This chart updates with your inputs. The green bars show how much money the lost energy is worth each year if never cleaned; the blue dashed line is what cleaning costs per year at your chosen frequency. When the green bar towers over the blue line, cleaning clearly pays for itself.

Annual energy loss value versus annual cleaning cost.

Panel cleaning ROI explained

Why dirty panels cost you money

Every layer of dust on a solar panel blocks a little light. Individually the effect is small, but it compounds: by the time a storm-season layer builds up, the system may be producing 10–20% less than it should. On a 5 kW system in a sunny area, that can mean 1,000 kWh or more of wasted energy per year — often worth several hundred dollars.

Does my region matter?

Yes, more than almost anything else. Arid, sandy and desert regions with frequent dust storms see the fastest soiling, while humid areas with regular rainfall see slower buildup. Agricultural land adds pollen and straw dust, and coastal sites add salt spray. If you live near a dirt road, construction site or open field, expect faster losses.

How often should you clean?

A sensible starting point is twice a year — once after the dustiest season and once mid-year. Quarterly cleaning makes sense in heavy sand or agricultural areas. Use the frequency selector above to compare costs at each level and pick the frequency with the highest net benefit.

Professional or DIY cleaning?

Professional service typically costs $40–$150 per visit depending on system size and roof access. DIY cleaning with plain water and a soft brush costs almost nothing and recovers most of the same energy on ground-mounted or easily reached systems. The calculator treats your cost per session the same either way — put zero for DIY.

Is cleaning really worth it?

On most systems in dusty regions, yes — the recovered energy often exceeds the cleaning bill several times over, especially as electricity prices rise. On small systems in rainy climates the margin is thinner, which is why the calculator shows the net benefit directly instead of just the loss.

Related tools and guides

Plan the rest of your system around clean performance: the solar panel calculator sizes your array, the savings calculator projects long-term savings, and the solar ROI calculator compares full project economics. For storage planning, the battery calculator shows how much backup you need. On the buying side, the inverter buying guide and the battery bank design guide cover matching equipment.