Case, great idea, I have been designing and using solar power on my RV's for years !!!!!! Currently have 940 watts of solar, 50 Amp MPPT Solar Charge Controller, 520 Amp Hours of AGM battery storage, 2000/4000 Watt PSW Inverter, 4KW Generator...
A few things in the interest of Codes and safety and fire and battery protection are as follows:
1) When you run wiring FROM the batteries TO any devices (say solar charge controller or other loads or equipment) YOU MUST PROVIDE PROPER OVERCURRENT PROTECTION to protect the wiring and it needs to be located at or near the energy source IE the batteries NOT far away downstream...…….
2) In order to be able to shut off the solar panel from the solar charge controller I ALWAYS HAVE A SWITCHING DEVICE there at the solar charge controller. I use a manual reset DC circuit breaker there.
3) "Some" people place overcurrent protection right at the solar panels output but since that energy is somewhat self limiting and less of any risk or hazard, "some" do not THATS YOUR CHOICE
4) Size the wires for adequate ampacity and if voltage drop becomes an issue they might need re sized
In a nutshell I would have a shut off on the solar charge controller input and place proper overcurrent protection (fuse or breaker) where wires feed off the battery. NOTE an MPPT solar charge controller can yield more energy harvest then a PWM but they cost more
John T Retired Electrical Engineer and 49 year RV owner
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