I have an 06 sprinter van set up as a limo by midwest auto designs and am making it camping able. My van came with an aux. battery under the passenger seat that I have isolated from the starter battery that provides power to the inverter for a flat screen, xbox, dvdcd player, 3 circular roof vents with fans, overhead lights that I have changed from halogen to led,s. I am adding two EON agm,s group 31, 1150 cca, 205 minutes reserve cap. each. My aux. is a vented lead acid VARTA 12 volt 100 amp hour battery for semi traction?, not suitable for jump starts, A 004 541 34 01. I have two arco PV panels that put out 41 watts each and 22 to 23 volts in direct sun. I am adding a 12 volt frig like the ARB or ENGEL or Whynter[ any info on this?] 85 quart size to be run at the frig mode. I am also adding an ESPAR D5 hydronic for cold weather engine protection and warm cabin air. I believe the frig will use less amps if it can be run at 24 volts that I could run on the agm,s or the aux. too. I believe I will need more PV panels and hopefully not more batteries[ these EONS are $330 each plus tax and are rated for dual use as deep cycle and starter capabilities. I hope to use these 2 as a backup for my starter battery if I ever need them. My concerns are about charging these two different battery types from the alternator while running down the road and charging them from my roof rack PV,s. I intend to be able to camp for extended periods independent of the ignition and motor. I do have a marine battery switch[ Guest Selector Switch with Alternator Field Disconnect, 230 amps continuous,345 amps momentary. There is a lot going on here and my local auto electric tech doesn't do any PV stuff. I am trying to buy whatever I can ahead of time so I don't have to pay retail for controllers,wiring etc. from him. The 12 volt frig will pull from 1.5 to less that 3 amp/hours. Any suggestions for setting this up and protecting these high buck agm,s from over charging would be a great help to me and my local tech. Hope you can help. Thanks.