I kinda like the idea of a portable suitcase style solar panel setup. I guess they come with a built-in SOLAR CONTROLLER and all you need to do is just connect the setup to your battery bank and set the panels in full sun. If the solar controller is built-in to the panels I wonder how the controllers are powered up. External DC ???
4-5 AMPS DC Current from a 100W Panel should be a good Battery Bank top-off charge for you during the high sun day... Certainly would be a good SOLAR PLAN B thing...
My future planned upgrade thinking will include having one of these 2-pin Chassis cable connectors on both my trailer and truck. This portable solar panel could be adapted to plug-in either spot to top-off the battery banks installed in these locations... These ETRAILER POLLAX PK12800/PK12801 connector and plug is an overkill but since they would already be used on both the trailer and truck would be a neat way to get to the battery banks in both places.
NOTE: I got my answer about the solar controllers from looking up the manual... Had a quick chuckle where it read if your battery is down below 9VC then recharge the battery by other means before using the portable solar panels hehe...
PORTABLE SOLAR PANEL KIT Roy Ken