This is not a RV application but there seems to be a lot of solar knowledge on here so I thought I would ask. I run a 12V system in my remote cabin for LED lights and RV size water pump and CD play...
I believe BFL was suggesting supplementing the use of a more appropriate charger (on generator power), with the small panel, for continuous maintenance between charge cycles. The charger I suggested would indeed get the job done well within the OP's specified time frame of 8 hours.
The OP appears to only want to supplement generator charging with solar, not replace it.
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