Solar Guppy wrote:
It very simple, the panel increment is what ever it takes to have the solar panels output ( vmp ) be higher than the battery charging voltage. here in Florida you should chose either
( 5 ) 12V panels in series
( 4 ) 18V panels in series
( 3 ) 24V panels in series
for 48V batterys, you need at least 60 volts vmp, in the summer heat the panels will run about 70C
Then you can put as many stings in parallel ( with fusing and combiners ) as the charge controller is rated for. When that is exceeded, just add more charge controllers
YES, now that is making sense! The key is the battery charging voltage needed.
And now it is back to the question that I'm not sure that I'm getting an unbiased and correct answer to:
For the XW6048, with two XW-60-150 charge controllers, is it allowable for one charge controller to have three strings of three Sharp 224 watt panels, and the other charge controller to have four strings of three Sharp 224 watt panels? (And yes, I may be switching from Sharp 224 panels, but I didn't want to introduce more calculations for a different panel.) The voltage from each charge controller would then be the same, only the amps would be different. Why should that be a problem? Could the one controller "overpower" the other controller and somehow feed back to it? It doesn't seem possible, but I don't really know. Even when both controllers are hooked up to the same number of panels one group could be more than the other because of shadows, so it would be delivering differing amps. I guess an unequal charge controller setup is less than optimal, but why and by how much? And the inverter shouldn't care, it is just getting the energy from the battery pack?
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