Re: OT 12V deep cycle batt

Posted by jdemaris on April 21, 2005 at 06:01:23 from (209.23.31.231):

In Reply to: Re: OT 12V deep cycle batt posted by T_Bone on April 20, 2005 at 16:50:18:

I don't understand why two 6 volt 205 AH Trojan batteries would out-perform two 12 volt 105 AH batteries. In the former case, two 6 volt batteries in series have an output of 12 volts and 205 AH. The two 12 volt batteries in parallel also provide 12 volts but provide 105 AH X 2 = 210 AH. 210 exceeds 205. So, unless the ratings are untrue, these are almost equal situations. Quality may be a different story.
The two 12 volt batteries with a total AH output of 210 are supposed to run a 6 amp load for 35 hours. I can't say I've tried it, but I have two RVs. One has an LP furnace with electric ignition and draws a total of 6 amps at 12 volts when running. I have another that draws 4 amps at 12 volts. One case in point. One camper sits on some property I have in the Adirondacks. We have used it, so far, four days at time. Has a 6 amp draw furnace, 5 amp draw waterpump, and a few 12 volt lights. We've use a single 12 volt deepcycle battery from Walmart - cost $55 with a 115 AH rating. It's always lasted the four days without going dead. Doing the math, it should be good for 10.4 hours of continuous use of the waterpump and furnace, which comes to 2.6 hours a day and 6 minutes per hour. This is not in winter use, so the furnace does not come on much.
I've been researching batteries a bit since I will be installing some photoelectric panels soon in a remote cabin. From most of what I've read - from solar equipment dealers and actual users, the best buy - i.e. dollars per AH, is still a lead-acid battery from a place like Walmart. The Trojans are popular, but not sure if they save anything in the long run. I just bought two batteries yesterday from Walmart. Each is 12 volt, 115 amphours, and 600 CCA at $55 each.
On the subject of quality and/or longevity - I don't know. I had been buying Nautilus (spelled wrong?) and Exide which may be made by the same company. They were all crap. They'd go bad in less than two years regardless of use. So, three years ago I started buying the Walmart batteries - I have no idea who makes them. So far, no failures.

Follow Ups:

• Re: OT 12V deep cycle batt T_Bone 17:26:48 04/21/05 (4)
  • Re: OT 12V deep cycle batt jdemaris 20:16:29 04/21/05 (3)
    • Re: OT 12V deep cycle batt T_Bone 00:00:32 04/22/05 (2)
      • Re: OT 12V deep cycle batt jdemaris 05:30:11 04/22/05 (1)
        • Re: OT 12V deep cycle batt T_Bone 13:34:22 04/22/05 (0)

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