Comment Re:Central planning failure (Score 1) 231
I know most PWM charge regulators are of shunt type, so they short the panel. That will slightly increase the losses on the cables (but not to much, since the current doesn't increase that much betweet MPP and Short-circuit), but the power output by the panels will still be very low, maybe 10% or the available capacity.
I don't know about the effect you talk, but I wonder if shorting the panels improves lifetime.
I also don't know if MPPT trackers (either grid-inverters or charge regulators) also do the same when they don't need the full power (i.e., if they are configured to move to the "right" or to the "left" of the MPP).