slightly different solar qx
Am looking at solar on a small class A. I currently have 3 group 27 batteries (rv/marine) for the house. (prior owners had just installed 2 new, and I had one from a trolling motor setup) they will...
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"Below 25C panel power increases while Isc declines favoring MPPT."
That 25C is panel temp, not ambient though.
The knock that PWM wastes power has no meaning because the panel goes to battery voltage, well below whatever panel voltage is at the time. Watts are of no interest--it is all about the amps.
You do get more amps using MPPT, especially in the shoulder hours, but by high noon the MPPT is only a little ahead on amps. I agree with over-panelling a bit with MPPT to get a bigger AH haul over the whole day
That 25C is panel temp, not ambient though.
The knock that PWM wastes power has no meaning because the panel goes to battery voltage, well below whatever panel voltage is at the time. Watts are of no interest--it is all about the amps.
You do get more amps using MPPT, especially in the shoulder hours, but by high noon the MPPT is only a little ahead on amps. I agree with over-panelling a bit with MPPT to get a bigger AH haul over the whole day
