SolarDIY
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That's the most important part, IMO.
I was in the boonies once with another camper and rigged up something similar for them. The goal of this one was to run small loads off the inverter while the sun was out. I had a spare motorcycle battery from another project, a small spare inverter, and a relay. The battery was basically just a way to stabilize the solar charge controller and was not intended to run loads in the normal sense.
Basically whenever the sun was out they could run their small loads. When the battery voltage dropped below 12.7v (ie, sun no longer out) the relay would turn off the inverter and the loads would no longer be powered.
Since the controller was a single statge charger I set it to the Vabs of the battery, 14.5v.