Solar Soiling Loss Calculator — Estimate PV Energy Lost to Dirt
Estimate how much solar production is lost when dust, dirt and other surface deposits reduce the light reaching photovoltaic modules.
Soiling loss inputs
How solar soiling losses are estimated
Soiling reduces the amount of sunlight reaching the photovoltaic surface. This calculator treats the entered average soiling percentage as an annual energy-loss assumption and then models partial recovery from cleaning.
Why cleaning effectiveness matters
A cleaning event does not necessarily restore a module to a perfect clean-state baseline. Residual deposits can remain, and soiling can begin accumulating again immediately after cleaning.
Why measured data can be better
Reference cells, performance monitoring and paired clean/dirty comparisons can provide a site-specific basis that is more informative than a generic annual percentage.
Cleaning decision support
The tool also estimates the value of recovered energy from cleaning and compares it with an alternative soiling scenario. This helps frame cleaning frequency as an economic decision instead of assuming that more cleaning is always better.
Frequently asked questions
Does rain eliminate soiling loss?
Not necessarily. Rain can reduce deposits, but its cleaning effect depends on local conditions and the type of material on the modules.
Can soiling loss exceed 100%?
No. The input is bounded at 100% because the calculation represents a loss from a clean-condition generation baseline.
Does cleaning cost belong in energy value?
No. Cleaning cost is shown separately so users can compare recovered energy value with maintenance expense.