The main advantage of 24 over 12 is that it is cheaper for wire and solar controller because you are moving your electrical using volts instead of amps. You tube has good explanations of this and other aspects of solar powering. The system you described is way overkill for the average rvr. I have 720 watts of panels, and 3 100 amp hr lithium batts. We use our solar exclusively for electric all winter in the SW USA. We run atoaster, a Keurig coffee maker, the microwave for short times, tv 3 hrs per day, plus of course all 12 volt applications, my power tools when needed, etc. In other words everything we need. Again, YouTube is a wealth of information for those new to solar power.
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Gayle and John Devall
2017 Legacy 3720 IS and Disc brakes
1120 watts solar panels and 300 AH lithium batteries
2011 Ford f350 srw long box Lariat with B&W Patriot hitch. Residential Fridge.
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