As far as I know it is a Furian recepticle that is wired directly to your battery/batteries. No regulator etc, I think it is a sales gimmic more than anything else. It was a cheap way for Keystone to include solar ready in their sales pamphlet. There is no wires etc up in the roof rafters for future panels. If you buy a panel with the correct plug you could set it up and plug it in. The recepticle is located in the top part of convenience panel along with the water valveing controles.
Do a search about solar and there is some good information available.
Tom Marty
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