mppt vs pwm

brulaz wrote:

BFL13 wrote:
Well somebody please nip out there and measure panel voltage during Absorb/Float while running a load that puts amps above array total Isc.
...

In that situation, the Rogue controller will not be able to maintain the absorb/float voltage at the batteries and will switch to MPPT mode.

To clarify: To maintain the battery absorb/float voltage the controller has to put out the same power being absorbed in or removed from the battery. It does that by adjusting the array voltage. Figure 6.1 of the Rogue manual shows a nice linear increase in power as a function of array voltage up to the Max power point.

If the amount of power needed to maintain the battery setpoint voltage exceeds the Max power point, the controller drops into MPPT mode.

I'm not sure what the load current (at the battery voltage) exceeding the panel Isc has to do with it, as potentially the panel voltages can be much higher than the battery voltage (Voc=44v for mine) so power can be maintained. As long as the power required does not exceed the Max power point, the battery voltage can be maintained.