Solar Panel Output Over the Years Calculator

Panels slowly lose output. Here is how much.

Find the degradation figures in the panel's performance warranty. Everything is worked out in your browser. Nothing is saved or sent anywhere.

1. Array

First-year output (kWh/year)

First-year loss (%)

Loss each year after (%)

Year to check

This uses the "first year" figure as the drop from the label output. Warranty wording varies, so check yours.
Safety: in Australia, any work on 240V AC wiring, including connecting an inverter, battery or solar system to a home's switchboard or fixed wiring, must be done by a licensed electrician.

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