If you're serious about LiFeP04 batteries, look at
http://www.electriccarpartscompany.com. I was able to get 12 volts, 390 amp hours, for about 1600. (8 times 195 amp hour 3 volt batteries). I will use a 400 amp alternator-to battery charger (Sterling:
http://sterling-power-usa.com/12volt400 ... arger.aspx), fron the Sprinter 250 amp alternator. I'm also using Sterling's 2500 watt inverter/charger
http://sterling-power-usa.com/Procombi- ... 20vac.aspx.
John
'14 Sprinter, in process of homegrown conversion