True.
But if the panels are near horizontal, collecting dirt, leaves, and small growing things, they could be losing a LOT more than 5-10% without cleaning at very short intervals.
If it were me I'd buy 11 panels instad of 10, put the glass up, and relax for six months to six years at a time.
The whole POINT of things like electrical power is so YOU don't have to be doing a lot of work - like scrubbing stuff - using your own manual labor.
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