"So if this ever flies, a PWM with max input V of over 55V is what I need. Or go with a cheap mppt. Neither has to be fancy.You need to be very aware of the CC Voc maximum with cold temperatures especially if Ontario implies Canada.
"I posted about my 60 cell on 24-24 stalling out at 30v, which was just ok to meet the 14.8 spec." A successful experiment but CC mfgs recommend 72 cells as there is no head room for 60 cells. A 3 percent wiring loss yields 29.1V which is below the flooded bulk charging voltage.
