12 ,15 ,7 amp? For the 12 volt. What trickle would be best for someone who is out of the van for 12 ,13 hours? I plan on 2 agm batteries for now. They will be connected to the starter battery but don't plan on driving more than 1/2 hr. a day. Battery size together may be 400 amp/hrs? Still not knowledgeable about what battery size to get so let me know how many amps I would need for (in the summer) to run about 400 watts? In the winter probably half. On another note my brain must be getting the daily requirement for getting the cells recharged LOL They say the more you learn when your older you lose less cells in there. I can't believe all that I've learned with you guys in a couple of months. Thanks <img border="0" align="absmiddle" src="https://vanlivingforum.com/images/boards/smilies/smile.gif">