jrnymn7 wrote:
12thgenusa wrote:
jrnymn7 wrote:
But shouldn't panel and output amps be pretty much equal when only bucking?
No. That is one of the advantages (some might say differences) vs a PWM controller.
soooo much to learn... thanks for your help!
Also you have 24-12 vs 12-12. But the question is what happens when the controller that has the buck converter in it goes from MPPT to just PWM and there is no other load except the battery?
The controller adjusts "to meet the demand" going off Vmp to a higher V so output amps fit the demand. The controller efficiency would need input watts to be higher than output watts. Input V is panel voltage (say 34 in 24-12 or 17 in 12-12) Output V is battery voltage, say 14.8 at Vabs now in Float at 14.8.
Ignoring controller efficiency, with input watts equal to output watts, and input V higher, then input I must be lower. But there is controller inefficiency, so output watts is lower along with the output V, so could there be a situation where the Is are now equal? (no other load except battery)
