the full white paper is informative although I believe biased as one can see in the graph fig 15 (chapter 7). The problem is their comparison includes series connected panels for MPPT! Well additional voltage above batt from somewhere!
"Let us now assume that the MPPT controller is connected to a solar array with sufficient cells in series to achieve an MPPT voltage several volts higher than the highest battery voltage."
Full white paperIt is hot here! All I need to do is look at fig 15 and see that PWM is above the 90% line in the temps of concern. The MPPT line should mimic PWM when Vmp is less than batt voltage as seen in chapter 5. Vmp drops with heat!
"Most MPPT controllers cannot transform a lower voltage to a higher voltage, as that’s not what they are made for. If the MPPT voltage Vm becomes lower than Vbat, they will therefore operate like a PWM controller, connecting the panel directly to the battery."
to me the 90% line represents the bucking eff. With regular controller limiting power in abs and float it just don't matter much then you go series (wiring. light and heat) and ya need MPPT.
