Solar Controller (cheap china)
I started w/ accidently getting the winning bid on a $130 100 watt panel. So then I had to buy a cheap china $11 10 amp controller, right ? It all worked great, so great infact, I bought another nea...
Forum Discussion
mena661 wrote:
X2. BTW, if I were buying, I'd probably get a Sharp because of the BFL's reports of getting right at and even over his panels rating. BUT, if a panel came up on sale and it was REALLY cheap, I might be tempted to get two or more of that one instead.
Well, since we deviated into panels discussion...
Vmp/Imp exceeding the specs is not necessarily good. This Sharp in Solar Blvd guarantees +10/-5% accuracy of Vmp/Imp (and so does the unknown Perlight). -5% is a bit low if you happen to have it. +10% is too much deviation when you connect 2 panels, MPPT controller gets confused. I prefer having no more than +/- 3%. Not all the Sharps are that "bad", some models have +5/-0% tolerance. Frames of Sharp come in 4 different profiles see Figure 1 and corresponding model number, important thing when you use side brackets.
