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6 volt deep cycle house battery bay

Posted 11-26-2015 at 01:01 PM by ladagobago
Updated 11-27-2015 at 02:18 PM by ladagobago (add info)

there are more opinions about 6 Volt vs 12 Volt house batteries, than peas in a pod. I have my own thought too and it is that 6 VDC are the only real deep cycle battery. I had all kinds of "marine deep cycle" on my boats and none of them were true deep cycle. They all were used for starting 454 engines and keeping lights on at night while at anchor. They did what we needed but none lasted more than three years.

Once I went to a true deep cycle battery system I was able to run my residential refrigerator, stand alone ice maker and watch tv or run the stereo. I tried going with 12 VDC for house batteries and they crapped out in no time like two years. I went back to 6 V DC batteries and they are just great.

I still prefer the flooded batteries = 6 volt for house battery. See Picture below - notice there are no extra patch cables. I made buss bars out of aluminum stock and wrapped with tape to insulate in the event of a dropped tool etc. at less than $100 each they offer the best balance of bucks for battery or dollars for amp hours.

There is more to the design than just more lead. The composition of the Grid is also of improved material allowing for expansion during discharge, as well as the density of the surface material for a different rate of discharge which really makes it a deep cycle battery. So thicker and better relate to longer life. The space below the grid is greater which allows for more space below the grid, for material that will slough off the plates, to accumulate harmlessly before shorting out the plates and ending the life of the battery.

Most (90%) of 12 v so called marine deep cycle are designed to be able to support the high rush current required for starting large long cranking engines like the 454 cu in commonly found on boats and RV's. These batteries are a compromise of engineering to TRY and meeting the needs of both worlds. High Current and Slow discharge. Since they try to pack this into the group 31 or 27 you will find the physics and science just will never equal that of other types of batteries. This is why they generally do not deliver the expected result over the course of time.

I prefer dedicated batteries for specific usages.
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  1. Old Comment
    Great idea. We are picking up our '96 Monaco Sunday. I checked the batt compt and there are two 12V deep cycle batts in it. I was thinking seriously about doing the same thing you did. Could you label the pos/neg terminals. It's hard to make out the connections. I'll keep that pic if you don't mind. Thanks again.
    Posted 03-01-2016 at 05:38 PM by oojimmyc oojimmyc is offline
  2. Old Comment
    I am also going to deep cycle 6 volt batteries.
    I have to build a bigger place to fit 6-6 volt batteries.
    I have 3-12 volt batteries now.
    Posted 05-07-2017 at 01:49 PM by Old Truck Driver Old Truck Driver is offline
  3. Old Comment

    6 volt batteries.

    I have two 6 volt "Supper Start Fleet and Heavy Duty" batteries that were purchased in Jan 2022. I made the mistake of leaving the lights on for two days and discharged them both. Are these a good battery and will I be able to recharge them? If not what brand do you folks recommend?
    I wanted to post a picture here but did not know how.
    Posted 09-12-2022 at 09:53 AM by garyw148 garyw148 is offline
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