Ah... I get it now. So if production was down 10% he got back 6 - 8% not 10% and he's not losing 66 - 75% from dirt. ok. IMHO you're into 'margin of error' territory there.
That's why I just wait for rain. If I'm super bored I'll wash the panels but the production gain is lost in <2 weeks.
That's why I just wait for rain. If I'm super bored I'll wash the panels but the production gain is lost in <2 weeks.
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