I'm in Oakland California. Did you hear that CA is burning? We've had 4 days of ash fall and blocked sunlight. Today we got some sunlight, so I cleaned the ash of my roof top panels to see what difference it made. Used a hose and a brush and I cleaned 10 out of 14 rooftop panels. See below photos of the panels before cleaning so you can see how dirty, and the energy generated graph. It's not very a scientific test, but I am surprised that dirty panels work almost as good as clean ones.
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