Solar charging question

But then, can he charge his camper batteries?

Seems easiest to me to set up for charging the camper batteries which he needs to do anyways, at 12v, then add a $20 transformer...

I just got a RadRover a few months ago.  Love it!  I haven't boondocked yet with the bike but I plan on using an inverter.  Rad Power Bikes seems very specific on warranty issues related to their batteries.  The batteries last a long time.  Depending on how you ride, a charge will last all day.  They do seem to take for ever to charge though, and of course, while you have plenty of time to charge overnight, that doesn't work too well vis a vis solar power.  Unless you charge your Pod battery and use an inverter to charge the bikes overnight.

TT

Motor7, depending on what you run in your pod while boondocking and how much you ride your ebikes, one or the other might be your major energy consumer. If like Tars its your pod, then the efficiency of charging your ebikes is not that important in the overall scheme of things. 

In that case I'd go with Tars' approach and install an inverter, that would allow you to charge the bikes day or night using the factory charger, so not compromising your warranty or risking incorrectly charging the Li Ion batteries (overcharging Li Ion batteries is likely to cause them to overheat and catch fire). An inverter lets you run other loads at your campsite as well. Get a true sine wave one if you go this route and consider one in the 2-3kW range so you can run larger loads like your microwave for SHORT periods of time.   

If you are using a large amount of your total energy budget for the ebikes and don't care about night charging or your warranty, then a single solar array with dual MPPT charge controllers (one set up for 12V lead acid, the other for 48 volt Li Ion) might be the way to go. You can avoid the high cost of  two series 24V modules and use one or two standard grid tie solar modules, with one controller "bucking" the module voltage down to 12V and the other "boosting" it up to 48. That would be the most efficient approach. 

Only one controller could run at a time, the MPPT functions wouldn't play well with each other. You could switch them manually or set up an automatic switch over when your prioritized battery reached full charge. 

Or you could go with furpod's approach which would be in between on efficiency but would allow for nighttime ebike charging. You would need to get into the Li Ion battery charge specs and get an adjustable 12 to 48V dc dc converter to be sure you didn't overcharge the ebike batteries. 

Bottom line is the hardware exists to do whatever you want, but you first need to decide how you want this all to work and what your priorities are.