Why clean your panels every year?? Check out this video to see, how a simple 5 minute cleaning can significantly boost your power output!
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We hooked up a dirty solar panel to a constant voltage DC electronic load. We set the voltage to 36V and found that our dirty panels were outputting about 4 Amps which is equivalent to about 145 Watts. Once we cleaned the panels, we saw in increase to 5.1 Amps (183 Watts), which is the full power you can expect in typical conditions.
The amperage data was linearly mapped to a visual power meter to show the decrease or increase in power in real time.
The dirty panels were outputting 26% less power than when fully clean.