Simple math (TM) says that 12*6= 72V... And if you want to charge a 12V battery, the easy solution is to apply ~14V... That's how an ICE does it... 14*6 = 84V and 84/12 = 7...
So 7 12V batteries will charge a pack of 6 12V batteries with acceptable losses... an 8 pack at 96V is even better... and even better is that it splits into two 48V packs... And a Kaneka panel will charge a 48V pack...
Two Kaneka's and 8 spare batteries makes a halfdecent charger for a 72V EV... 16 batteries is even better... And you seem to have batteries...
