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I have a 24 volt system. I have one 24v panel with72 cells (45.8 volts max, 5 amps) and two 12 volt with 36 cells each (22.6volts each, 5 amps). I will wire the two 12v in series to and then wire them in parallel to the 24v panel. Can the 75/15 run these or are there too many cells? It should send 45v and 10.9 amps to the 75/15 so volts and amps are within its capacity.
@garyartista No. 144 cells in series will give an open circuit voltage of about 90 volts. Way above the mppt's input limit of 75v.
You could series connect the 2 x 36, and then parallel them with the 72 cell panel.
Not ideal, but will charge a 24v battery.
Thanks for the reply. My wiring plan is series the 12v and then parallel them to the 24v. It should work.
Well I have an odd problem. When I wire the two identical 12v panels in series I still only get around 20 volts. I checked the wires back to the panels and it's plus to negative for sure. I wired them the opposite way, in parallel, and still the same voltage. If anyone has any thoughts, much appreciated.
