30A or 40A controller?
I’m going to mount 2 160w panels rated at 9.5 isc amps to feed 2 6v batteries…260ah. If I were to mount a 3rd panel I’m still under 30amps so a 30 amp controller should work fine….or should it. I’ve ...
Forum Discussion
grizzzman wrote:
The panel i chose has a VMP of 17.40 volts and a IMP of 5.75 amps. A solar panel has voltage drop as temps rise, The trick is to let the volts drop a bit to closer to charging voltage. This will get the PWM controller the most efficient. A higher VMP will have a lower IMP and will deal with higher temps better but with less efficienty. Am I clear as mud?
Bypass diodes are in most panels. The number one reason they are there is to protect the manufactuers warranty.
I prefer the shade, but the panels and wife prefer the sun....I'm outnumbered. :)
The panels I'm looking at have VMPP @ 18.5v and IMPP @ 8.65a I thought bigger was always better. :B
My limited understanding of bypass diodes was that (besides the blocking function)they isolated shading losses to cells that had those diodes. If a 4 x 9 array of 36 cells had 36 diodes, any one cell could be shaded and all others would still pass power. If the panel had just a couple of diodes a whole row or two's power might be blocked just because of shading on one cell. This may be an oversimplification....or....just totally wrong, but it's what I've been led to believe and why I wonder why there's not more emphasis placed on panel diode quantities.
