Today I finished my house battery bank install (need to tidy up wiring around the dcdc chargers). All I need to do next is install a battery selector switch at the switch board so I can run the house from either the house bank, or engine bank. The install consists of 4x200ah batteries, 2x40amp dcdc chargers, 1x40amp 240v charger, 500amp shunt and battery monitor, 3000 watt inverter, 400amp fuse for inverter, 80amp circuit breaker for supply circuit, 2x600amp buss bars. All battery cables up to buss bars are 95mm2, same to inverter, and 70mm2 from buss bars to switch board.
The inverter is overkill for now, but long term I’ll be adding desal, chest freezer and maybe an aircon.