It has several charging options. They all can be charged really fast at the bus voltage of 380V at one of the quick-charge stations. Supposed to be under 30 min to get to 80% charge from near zero.
They all also come with a 115V 15 amp compatible (uses 12 amps) built-in charger which will charge up the car from zero in about 21 hours. If you have a lot of solar, generating 115V at 12 amps (which is about 1400 watts) is not out of the realm of possibility. 2kW of panels would do it even with solar converter and inverter losses. We carry 1100 watts but could easily bump that to 2kW.
A Honda EU3000iS
generator could charge it.
Almost all pay campgrounds have 115V 15 amp outlets, even the cheap army corp campgrounds.
The point is that it is a huge battery bank. Probably enough juice to run a rig for a week with no sun or generator. Not practical for the van camper maybe, but for a person who was considering a big lead-acid bank in a big rig...
Experience is what you get when you didn't get what you want.