My FFR had all the 24v batts and the cranking battery ripped out and a 12v RFSV style dual battery system installed in the passenger side battery locker, so my system is similar to yours I guess...
I have a pair of anderson connectors coming off my deep cycle "house" battery (which is an AGM type) which are routed into the rear cabin. I usually run a 12v fridge freezer off it while travelling, but it works for both input and output.
If I'm propped in one spot camping for more than a few days I'll usually break out the solar kit which in my case consists of:
- 135aH slim AGM battery - housed in a 20mm ammo box with styrofoam or sprayfoam padding to stop the battery sliding around inside the box. I have three of these battery boxes.
- Each battery has a fused cable with anderson connector on one end bolted onto the battery terminals.
- 200W folding solar blanket with anderson connector. I have three of these.
- Cheapie charge controller with anderson connectors (seeing a pattern here yet?). I have four of these - they are cheap after all, so they will crap out sooner or later.
- Various adapters and cables to suit the equipment I run off the system (fridge/freezer, LED bar or strip lighting, laptop charge adapter, drone charge adapters, USB power hubs for recharging camera batteries, etc. Occasionally I'll also run a 12v pump for shower or transferring water between drums.)
The battery boxes can also be charged from the vehicle via anderson cable or from a small petrol generator I sometimes carry if there's going to be prolonged periods of rain and/or cloud cover.
It's not the most high-tech system, but it works for me and might give you some ideas.
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