I'm installing a Magnum MS2812
inverter. I have 3 SOK LiFePO4 batteries, but I managed to make room for a fourth. When it arrives in Sept., I'll add it in. I'm going to run 4/0 cables to everything.
My question is in regards to hooking up the existing trailer's 12v wiring onto the buss bar/distribution block. I'm just planning on using the existing cable that goes to the existing batteries up front. I'm not sure of the gauge of that wire. I believe it's 6 or 8 gauge. I want to run an additional circuit breaker just off the the buss bar. The small circuit breakers under the trailer do not make much since. The main wire coming in has a 30 amp breaker. Then it spits off into different circuits. One of these circuits has a 40 amp breaker. So, something isn't quite right down there. That's not unusual from what I've read here. I plan on checking everything out while cleaning everything up down there. But I still want to protect it just off the buss bar. A 50 amp CB would probably do the trick. A 100 amp is just a few dollars more and would allow room to add things latter without taxing the original wiring and loads.
Perhaps I'm overthinking this. I can get 3 x 70 amp anl fuses with a fuse block for 10 bucks at the big river. This might be an option as well.
Is there a way to tell what the total 12v max draw is on the original trailer wiring? Just adding up the fuse rating in the fuse panel inside puts the amp draw above what the original battery cable could adequately provide.