I have a 75 | 15 MPPT controller and want to know if it's safe to connect directly to the battery. I have a tiny stretch of 14 AWG aluminium wire to connect the controller to the battery and the controller to my solar array.
If this is relevant my solar array is currently 300W of panels in series @ around 25VOC but going to add another 100W and maybe do 50VOC at less amperage.
EDIT:
I have some larger gauge wire however it won't fit inside the charge controller ports.
Currently using some wire from aliexpress which is fine stranded but the insulation is not double. Claims to be tinned copper but I think it's aluminium.
Waiting on some better wire from amazon.
The battery is 12V 120Ah. I'm loosely following mobile-solarpower.com where Will uses a 50Amp circuit breaker for a 40Amp charge controller. Can you use any size circuit breaker above what the charge controller is? Could you use a 180A circuit breaker with the Victron 75 | 15 for example? Is it meant to protect the battery or the controller?
