I still have a question about whether we want to expand the installation correctly. Of course, it will be done by a company with permissions, I don't want to do it myself, I just want to make sure that we are doing it right.
Sofar 8.8 KTL-8
Maximum operating current 11A, short-circuit current 14A
MPPT operating voltage range 160V–960V
Full power MPPT voltage range 380V-850V
Maximum input current 1000V.
I currently have 22 310W panels installed, divided equally into 2 strings of 11 panels each.
Nominal current 9.43A, nominal voltage 32.88V, open circuit voltage 40.22V, temperature coefficient -0.30%/K
I want to add panels to this installation, hence the idea to put the old panels on one circuit and add the new panels on the second circuit.
Wouldn't 22 old panels on one circuit be too much? Can you leave them whole or would it be better to remove 2 for safety and leave 20 of them?
The new panels have a current of 12.13A and a short-circuit current of 12.9A. Will they work with the Sofar 11A/14A parameters? It's hard to find anyone in the area who has panels below 11A. I would like to add 10 or 12 such panels to the second circuit.
If I count correctly, theoretically I should not exceed 960V or 1000V. 22 panels x 40.22V open circuit x 12% voltage increase for -15°C temperature. = 991V. The question is whether this can be the case or whether it is safer to use 20 panels and the output will be 901V at a temperature of -15.
There is no problem regarding the operating voltage, we are within the range, but the open circuit voltage in frosty weather is probably a bit too high or on the limit. And then the question is how it relates to 6200W per MPPT, and if it exceeds it, it will disconnect or cut off.
please.
