Is Solar Panel Cleaning Worth It?

Short answer: for most South Bay homes with a 5 kW+ system, yes — professional cleaning pays for itself within the first year, often within the first few months.

How the math works

A 6 kW system in Southern California produces around 9,000 kWh per year. Dirty panels typically lose 10–25% output. At LADWP/Edison rates, even a 15% loss is roughly $400–$600 per year in wasted production. A professional cleaning is a fraction of that.

When it's especially worth it

Homes near the coast (marine-layer film), under trees (sap and droppings), near freeways (heavy dust), or with NEM 2.0/3.0 export credits where every kWh counts.

When it's less urgent

Very small systems (under 3 kW), brand-new installs in their first 6 months, or properties that get heavy seasonal rain. Even then, an annual clean is cheap insurance.

How to verify the ROI

Check your monitoring app the week before and the week after a cleaning. South Bay homeowners commonly see 10–20% production jumps after the first clean — measurable, repeatable, and visible on your next bill.