The large EFOY fuel cell - 8.8 amps per hour times 24 hours a day - will restore over 200 amp hours per day into an RV's battery bank.
That's equivalent to bringing back up to full charge about a 430 AH lead acid battery bank that you deplete down to 50% SOC every day. It would take a healthy size RV solar panel installation (even if you could fit it on the roof) and good sun at a good angle each day to do that. If I didn't care about air conditioning, I'd save the Onan or EU3000i Honda generator cost - when buying a new motorhome or TT - and go for an EFOY, instead, for self-contained power guaranteed all the time.
I can think of worse ways for dyed in the wool drycampers to spend $4K RV dollars.
