Free tool
Solar Panel Cleaning Savings Calculator
Dirty solar panels quietly lose output — and on the foggy Humboldt County coast, moss, salt-fog film and bird droppings make it worse. Estimate what soiling may be costing your system each year, and what a cleaning could help you recover.
Estimated yearly loss to dirty panels
$139
About 396 kWh/year at 6% soiling on a 6 kW system.
These are rough estimates for illustration, not a quote or a guarantee. They assume roughly 1,100 kWh per kW each year for the foggy North Coast and the soiling range you pick. Your actual numbers depend on your panels, shading, tilt and how much buildup is present — which is exactly why we take before-and-after photos on every Humboldt County solar panel cleaning.
About this tool
Solar cleaning savings: common questions
How accurate is this solar savings calculator?
It's a rough estimate, not a quote. It uses your system size, a regional production figure for the foggy North Coast (about 1,100 kWh per kW per year), your electricity rate, and a soiling-loss range. Real losses depend on your exact panels, shading and how dirty they are.
How much output do dirty solar panels really lose?
It varies. Regularly cleaned panels lose only a percent or two, while heavily soiled panels — moss, bird droppings, pollen, salt-fog film — can lose 10% or more of their output until cleaned.
Does cleaning guarantee I'll recover this amount?
No. The figure is an estimate of what soiling may be costing you, which cleaning helps recover. We take before-and-after photos so you can see the actual difference on your array.