Hi, I'm building my first solar kit. I know that too many amps going down a thin wire can melt the wire or destroy the mppt. I plan to run the 4 100w panels in series. I think that this will increase the voltage but that my mppt should keep it at 12v so that I can run 12v devices. I know that in series that amps DO increase. My question is what size circuit breaker should I use on the 4 to 1 combiner harness. Meaning...the 4 sets of wires coming from the panels into ONE wire that goes into the MPPT. I want to put a circuit breaker after the ONE wire harness before it goes into the MPPT. I have a 40 amp circuit breaker and a 50 amp circuit breaker. However what I'm reading is the series panels will keep the amps to a total of about 5.7 amps. So should I put in just a 10 amp circuit breaker or will that keep tripping? Any help appreciated! Thanks