One of the rewards of having copious solar is the ability to share excess power with others. I’ve done this before by running an outdoor extension cord to a nearby camper (at an RTR), or through the crude 12v/usb power outlet station by the side door. It’s automagically enabled when there is excess power and disables itself when house power drops below 12.9v.
But I also have extra panels, which I set out in shady areas or when insolation is otherwise particularly challenging. I’ve thought these might be put to good use by a nearby camper who had small/nonexistant solar but needed to charge a power station / solar generator thingy. I didn’t have anyone to experiment on, and after I did have a
victim co-experimenter I didn’t have a good way to get MC4 power into the devices.
The Rockpals doesn’t have any numerical displays, but I’m guessing the PWM controller can extract 50-70w from the panel (5.56A Imp x 9-12.6v, depending on state of the internal 3S lipo pack).