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
It was a good call by CA Traveller. You might be able to get mppt on certain occasions, but it's severely limited.
Using a pwm controller would be more efficient when connected to a 24V battery. But you still will run into problems. Usually line losses aren't a problem when using pwm. Since you don't have much voltage headroom, line drops as well as heat become an issue. The pwm controller is probably operating on the right side of Vmp on the IV panel curve. You will get less than Isc. All because you only have 60 cells.
Using a pwm controller would be more efficient when connected to a 24V battery. But you still will run into problems. Usually line losses aren't a problem when using pwm. Since you don't have much voltage headroom, line drops as well as heat become an issue. The pwm controller is probably operating on the right side of Vmp on the IV panel curve. You will get less than Isc. All because you only have 60 cells.
BFL13 wrote:
So that is two possible wrinkles out of the way
1. It was questioned (By CA Traveller?) whether a 60 cell panel could do that at all, and
2. could a PWM do it but not an MPPT due to panel voltage being limited to Vmp by the MPPT
