mppt vs pwm

In my controller, MPPT is used in the bulk stage only since once you get to the absorb and float stages the battery voltage is high enough and the battery acceptance rate is low enough that MPPT isn't needed and the extra amps wouldn't go into the battery anyways.

The buck converter is always active even in float which is good. At altitude each of my three panels produce a Isc of around 10a but I can pull a load of close to 50a without pulling the battery out of float.