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...
Forum Discussion
BFL13 wrote:It's certaintly relevant when comparing 3x100W vs 300W. Both panels panels lose about the same amount of power.
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.
Power loss is power loss REGARDLESS of how the power is used.
PWM power loss is even more relevant at lower battery voltages. For example at 13.4V float PWM can only supply Isc. So when the house load exceeds Isc the extra amps come from the battery while MPPT can supply more than Isc amps, reducing the battery draw down.
