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
My expensive Sharp panel is rock solid supplying its 8.2 Isc while my cheaper Sun panels are all over the map (except above rating) for Isc.
Sun 100w is rated at 6.4a Isc, and say the "tolerance" is 5%. but I have measured anywhere from 6.0 to 6.4 while the Sharp is doing its steady 8.2 or 8.3 (so it is not haze or whatever keeping the Sun Isc low at the time) perhaps the Suns are more affected by temperature change or whatever, no idea.
But I do get at least 12a from the two 100s, adding whatever Isc they each feel like that day :) and am not upset over the missing 0.8 amp I should be getting with two 6.4s adding. Mena is right--the price is so good, you can live with these little things.
The Sun panels are physically light-weight per watt compared with the Sharp and part of that is having smaller gauge frames, but I suspect also their cells are not as thick or whatever. BUT, they work ok and were a great price. The Sharp panel also has a junction box with more diodes and terminals. Sharp stopped making these 12v panels a couple ago and now concentrate on the grid-tie market with big panels.
Sun 100w is rated at 6.4a Isc, and say the "tolerance" is 5%. but I have measured anywhere from 6.0 to 6.4 while the Sharp is doing its steady 8.2 or 8.3 (so it is not haze or whatever keeping the Sun Isc low at the time) perhaps the Suns are more affected by temperature change or whatever, no idea.
But I do get at least 12a from the two 100s, adding whatever Isc they each feel like that day :) and am not upset over the missing 0.8 amp I should be getting with two 6.4s adding. Mena is right--the price is so good, you can live with these little things.
The Sun panels are physically light-weight per watt compared with the Sharp and part of that is having smaller gauge frames, but I suspect also their cells are not as thick or whatever. BUT, they work ok and were a great price. The Sharp panel also has a junction box with more diodes and terminals. Sharp stopped making these 12v panels a couple ago and now concentrate on the grid-tie market with big panels.
