It looks like controller efficiency goes up with cooler ambient temp at the controller. ( I am on limited data right now so can't look up those efficiency curves for the Tracer MPPT or any other's to confirm)
It does not seem to make any difference that the 230w/15a is close to the controller rating 250/20 like I thought it did.
So it is all about panel temperature that kills your amps with MPPT. I still need to run a test with the 230w panel and PWM with batts at 24v. I expect to get the panel Isc of the moment at the batts same as with 12v panels and 12v batts with PWM.
That would have made my amps 8.87 above, which is like 17.7 on 12s so it would still have beaten the MPPT/12v at 16.4 even with such low panel temps as yesterday's. If that proves out, then there could be "consequences"
