Luis, Now I understand. I would recommend adding a second deep discharge=20 battery in parallel with the first one. this will double your amp hours.=20 I would also recommend that you seriously consider adding the solar=20 cells. At least during the day they will add to the charge in the=20 batteries. You can mount the solar panel on the roof of the van. Do you have a cut off device between this battery and the car=20 battery? If not you want to add such a device so that the deep discharge=20 battery is disconnected from the vehicle system except when the van is=20 running. This is very important as the battery that runs the van is not=20 designed to be run down. The cut off is wired so that when you start the=20 van up and it is running the accessory battery as I will now call it is=20 then connected to the alternator for charging purposes. Yes you will=20 need some type of charging system running off of the mains as you aren't=20 driving long enough to completely recharge your accessory battery under=20 all circumstances. I hope that this helps. Thanks, rich! BTW: I did something like this for my motorhome many years ago. rich! On 9/3/2014 3:07 AM, Luis Moreira wrote: > Hi Richard, > This is what I am doing: > > www.lmtronics.co.uk > > I now have a 110Ah Trojan deep cycle battery. I guess that the bigger and > nastier load will be the fuel removal pumps. I also run the soldering > station and the soldering iron, but this id not going to be a continuous > thing. Jobs last around 1 hour, and there is travelling time involved > before and after. > The key cutting machines are not very power hungry and only used for abou= t > a couple of minutes at the time. > Best Regards > Luis > On 3 Sep 2014 06:50, "Richard R. Pope" wrote: > >> Luis, >> A 2007 vehicle even driven 45 minutes in one direction should be >> plenty of time to recharge the battery under normal circumstances. What >> are you using your van for? Are you using the van's battery to operate >> any additional equipment? Do you have a secondary battery? >> Thanks, >> rich! >> >> On 9/2/2014 11:53 PM, Luis Moreira wrote: >> --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .