Crazy 400A 12V setup check
’m at the point of finalizing a campervan electrical system and would really appreciate an experienced set of eyes on it before I commit. The setup is a 12V system with a 3kW inverter and a 2×314Ah battery bank in parallel (~628Ah total).
I’m aware this is pushing into high-current territory for 12V, and that’s been a key consideration throughout the design (cable sizing, protection, busbars, voltage drop, etc.). I did seriously evaluate a 24V route. Nevertheless, due to component availability, time constraints, and budget 12V ended up being the most practical option for this build.
I’ve tried to follow best practices around protection, grounding, and load distribution, but I’d like a sanity check on the system as a whole, particularly anything that seems unsafe, or just plain wrong (like the 360A disconnect?). At this point I’ve been looking at it too long to trust my own review.
All feedback is welcome, especially critical feedback. Diagram below. The system is intended to support full-time living for two people, fully electric (no gas, no AC loads).
