Strange, I thought panels made no electricity after dark.
The big banks of panels would offer an excellent roi. Can't see the residential market for cleaning taking off somehow - not at the £5 per panel some guys expect. I don't see them as any harder to clean than a velux window to be honest so £1 a panel could still be profitable for me as I have the equipment anyway. Customers can't see if they are clean anyway.
I have noticed a 100% increase in performance since I cleaned them in the dark. Think I'll put that on my website.
They do produce in the dark, it's just less.
£5 per panel is an outrageous price, you're right.
Just because customers cannot see if they are not clean does not mean we should not do a thorough job. I can't speak for others, but we take great pride in offering a professional service to clients, even on the parts of he property they cannot see. I'd want a roofer to be thorough on my house, even though I couldn't check his work easily.