mppt vs pwm

All I know is when I crank up the loads I can see close to the same amps in float as I do in bulk. Not a shock load like the micro that will instantly pull down the battery but rather slowly adding loads. Even if I add one too many I can see the amps climb until the voltage starts to fall. Right before that point I see 16a+ with each panel. Then again I run 2-1 watts to Ah and float is a very early thing for us. I usually pull the extra panel off the inverter bank once it hits float unless we are going to do a long run of the microwave or air conditioner.