A 5 watt solar panel is not going to do much toward recharging your batteries.
Most folks use solar systems capable of providing 100+ watts at a minimum.
It would probably be most useful for keeping the batteries topped off, while in storage, provided the parasitic load is not too high in the camper (stereo back-light, LP detector, etc) or is you have a battery cut off.
-Brian
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2014 Bullet Premier 22RBPR - let the camping commence!
2013 F150 Platinum - 5.0 - 3.55 ELD + towing package
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