About Solar Panel Cleaning ROI Calculator
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 : Use Solar Panel Cleaning ROI Calculator from the Finance category.
- Check the inputs : Review the required values and any optional settings.
- Read the formula : Use the formula and notes below to understand how the result is produced.
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.
Inputs
- System size
- Electricity rate
- Cleaning cost
- Annual dust loss
Outputs
- Optimal cleaning interval
- Estimated daily yield
Formula
Optimal Days = √(2 × Cleaning Cost / (Daily Yield × Electricity Rate × Daily Degradation Rate))