My new Cherokee said the same thing. When i asked the dealer, they said, are the lights working in the trailer? Well yeah, the lights were working and the radio was working. Went and looked at the trailer and found no plug in and no battery installed. But the lights were on and the radio was working. So yes, the one 50w solar panel on the roof works. At least in my situation. There was a device in the front cargo area also.
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"Take The Road Less Traveled"
2020 Cherokee 294BH
2021 Chevy Silverado 2500HD 6.6 Duramax Diesel
I've been an RVer since 2007, Lifetime Camper
Gotta love the Outdoors, Disconnect and Enjoy Nature!