I added a second battery for house/aux loads. 92AH Deka AGM deep cycle 27M.
Blue Sea ML-ACR with cab switch for combining and separating start and house batteries.
Redarc BCDC 1225d to charge aux battery thru alternator and/or solar.
Blue Sea 6 circuit fuseblock behind start battery wired to start battery mainly for lighting needs.
Blue Sea 12 circuit fuseblock under drivers seat wired to aux battery for all interior power needs.
Multiple Blue Sea AMG and ANL blocks for compressor load and other high amp loads.
In cab Ammeter and dual voltmeter for monitoring.
Winch to start battery with 500A switch on positive.
This setup allows me:
Self jumpstarting
Isolate parked/camping electrical loads to one battery
Charging to aux battery while parked with sun using accessories (fridge, usb, radios)
Force combine batteries during winching or compressor use
Ability to float charge both batteries to 100% when parked outside
No need for occasional shore power charger to top up batteries
In the odd case of 1 battery failure, I can still start and drive the truck with other battery.
There is definitely a bit of redundancy and complexity to my setup since I added the Redarc after I had the Blue Sea ACR. I did that so I can properly charge my agm batteries. Solar is rad as well since it constantly keeps the batteries full on days I don’t drive or if I feel like using power, it’s no worries.