Solar Panel Cleaning ROI Calculator
Calculate the optimal cleaning interval for your solar panels based on efficiency loss and cleaning costs.
Optimal cleaning interval
18.8 months
Estimated daily yield
36 kWh/day
Formula
Optimal Days = √(2 × Cleaning Cost / (Daily Yield × Electricity Rate × Daily Degradation Rate))
Use the solar panel cleaning calculator to find the exact breakeven point where the cost of cleaning your panels equals the value of the electricity lost to dust and dirt accumulation over time.
How to Use
Use this calculator to find out how often you should clean your solar panels. Enter your System size, Electricity rate, Cleaning cost, and Annual dust loss. Review the Optimal interval and Daily yield outputs to determine your maintenance schedule.
- Open the calculator : Start with Solar Panel Cleaning ROI Calculator.
- Enter values : Fill in the required inputs and any optional settings.
- Review the result : Read the output and use the about page for more detail if needed.
Common Questions
How much electricity does a typical solar panel system produce?
Energy production varies by geographic location, shading, and equipment efficiency, but a standard residential system generates roughly 4.5 peak kilowatt-hours (kWh) per day per kilowatt (kW) of installed capacity under full sun.
What is a realistic number for annual dust and soiling loss?
For most suburban environments with regular seasonal rainfall, an annual efficiency loss of 5% to 7% is standard. If you live in an arid, desert climate, near heavy agricultural dust, or downwind from active construction, your losses can climb to 10% or even 20%.
Does rain completely replace the need for manual cleaning?
While light rain clears away loose dust, it does not remove heavier materials like baked-on bird droppings, sticky tree sap, or industrial film. If these stubborn elements are left on the panels, they continue to cause localized efficiency drops even after a rainstorm.
Where can I find my current electricity rate?
Your electricity rate can be found directly on your recent utility bill, usually listed as the cost per kilowatt-hour ($/kWh). If your utility relies on complex Time-of-Use (TOU) or tiered pricing, using your average off-peak or mid-peak rate is a reliable baseline for this calculation.