Almot wrote:
Somehow I missed this:
The good news is the solar kit I bought is easily scalable to 400 watts without any other modifications
Yes, if you route the cable from panels to controller beefy enough for 400W. Especially with PWM controllers.
Kinda getting off-topic but I never understood this. Even at 12V, 400W = 33A. 10AWG is capable of that, and 8AWG, like I have, is rated to 40A. In reality, panel voltages are higher, which translates to less current, which only improves this.
I guess what I am driving at is I don't understand why people are running 4AWG cable to their panels when they have a 400W array.
Are they just doing it to minimze resistance?