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Not exactly sure what your prep package is...
If it is wired for solar, then you probably have a wire from the roof to the battery. Some prep packages called ready for solar just have a short wire from the battery to a plug next to the battery. Some of those plugs are proprietary to get you to buy their brand.
To add solar, yes, you need a solar panel, a charge controller and a battery. Solar is by far the best modification I have done to my RV, but I’m regularly camping without any hookups.
Lots of threads on this subject, lots of info.
Amazon prime days have had good deals on Renology solar panels for the last 3 years in a row. A 100 watt panel has been around $70, normally $120. I have 3 now, probably buy another one if they are on sale again.
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