I hosed down and scrubbed the PV panels this afternoon. They pick up quite a bit of dirt it seems. Maybe it's a combination of tree pollen and dust this time of year.
Today had intermitten clouds, the kind that really block out the sun and it gets cold fast. Cumulous? Sweater on, sweater off, all day today. Consequenty, I can't compare the benefits of washing the panels from one day to the next. I really want to know if it's worth my effort to do so.
I don't use anything other than the front display on the Sunny Boy inverter to tell me what my daily production is...and timing is everything. To be accurate, you have to read the display while the sun is still up and the inverter is at/near zero output, but before it shuts down. I dunno, maybe a 1/2 hour window. And I'm not good at remembering such things.
The best day so far was, as I recall, was a day in the first week of March with a daily production of 10.2 kWh. What would I have gotten if I had washed the panels the day before...10.3 kWh?
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