Solar Panel Wiring

[Hamiltonian]

I have a 2020 GD 290BH. In the front compartment there is a wire labelled "Solar". Where does it go? I know I'll have to wire in a controller before the battery and all that, I am mostly curious about where the particular wire goes and how I would be able to access it.

 

[Grandesigner]

There should be a solar wart on the roof to hook up to...