Forum Discussion
BFL13
Dec 18, 2015Explorer II
DAS26miles wrote:
When using those calculators, do you use 12 volts or 17 volts which is the output voltage from the panels to the controller. The wires from the panel to the controller are the longest length. It's going to be the panel output right? And from the controller to the batteries is going to be the limit set in the controller like 14.6 volts bulk charge and 15.5 volts equalization????
With PWM, your amps from panel through the controller and on to the battery is the Isc of the panel or their total Isc if panels in parallel.
With MPPT you have a buck converter, so now the amps from panel to controller input is Imp and then from controller it is output amps to the battery. If the MPPT is doing "24-12" you might see nearly twice the amps after the controller as from the array.
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