60 Cell Panel vs 24v Bank MPPT and PWM UPDATE
UPDATE--results with MPPT posted 1 June. Got a chance to run this test today with no clouds but a slight haze up high so not quite 1000 insolation, showed as 8.93Isc vs rated 9.0, however that did ...
Forum Discussion
Don't forget there needs to be a voltage differential inside the mppt controller. It could be 1V or more. In other words, when in mppt mode, the input to the controller needs to be at least 1V greater than the output.
My mppt plot (below) has problems around noon and a bit later. Even though that's a 36-cell panel, I believe it's starting to run out of voltage headroom (Vmp-Vbat). Charging current isn't as high as it should be. At 8 in the morning the headroom is 4.3V. At 12:30 headroom drops to 1.83V. The battery voltage was held constant at 12.2V throughout the test.
My mppt plot (below) has problems around noon and a bit later. Even though that's a 36-cell panel, I believe it's starting to run out of voltage headroom (Vmp-Vbat). Charging current isn't as high as it should be. At 8 in the morning the headroom is 4.3V. At 12:30 headroom drops to 1.83V. The battery voltage was held constant at 12.2V throughout the test.
