I have a battery bus where all batteries are connected to. From there there is a positive and negative 4/0 copper going to busbars about 7 feet away where the charge controllers and inverters are connected to. That 4/0 battery cable is currently protected by a 250A MCCB that disconnects both the positive and negative. What is the best/safest way to increase the charge/discharge to 500A continuous while still having a disconnect and over current protection on the main battery cable(s)?
Solutions I've been thinking about:
1) 630A Dihool 2 pole breaker. Weary of getting a breaker from Amazon/Aliexpress and trusting the safety of it.
2) Two 250A Midnite DC Breakers connected to 2 separate 4/0 copper cables. This seems simplest but would only disconnect positive side. Not sure that is acceptable?
3) This 600A switch. I would still need current protection for it and not sure what would work best.
This is for "only" 20kW+ of PV power. Surely other people must be running into this issue with much larger arrays.
Solutions I've been thinking about:
1) 630A Dihool 2 pole breaker. Weary of getting a breaker from Amazon/Aliexpress and trusting the safety of it.
2) Two 250A Midnite DC Breakers connected to 2 separate 4/0 copper cables. This seems simplest but would only disconnect positive side. Not sure that is acceptable?
3) This 600A switch. I would still need current protection for it and not sure what would work best.
This is for "only" 20kW+ of PV power. Surely other people must be running into this issue with much larger arrays.