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Old 12-22-2010, 11:36 AM   #11
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Originally Posted by Myles6543 View Post
I have to ask. What is the advantage of 2-6 volt batteries as opposed to 2-12 volt batteries.
I noticed a huge improvement in battery run time when I switched over to the 6 volts. With my wife's schedule we can't take much time off in the summer so we camp in the fall and winter. On the two 12 volts the furnace would take them down to one light on my tank/battery panel by morning. The two 6 volts still show 3 lights in the morning. It's great peace of mind knowing the batteries won't die in the middle of the night when it's cold outside. I was able to buy the 6 volts for $75 each and get 210 amp hours, versus the 170 amp hours my two 12 volts stored.
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Old 12-22-2010, 11:56 AM   #12
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Thank You very much for that information. I will take a look at my battery compartment and see if that is a possibility. I think my compartment only holds one battery but perhaps it can be modified. More amp hours would definitely be a big plus. I assume they would have to be wired together. I have always carried 2 batteries but 1 is stored in the storage compartment.
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Old 12-22-2010, 12:21 PM   #13
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Originally Posted by Myles6543 View Post
Thank You very much for that information. I will take a look at my battery compartment and see if that is a possibility. I think my compartment only holds one battery but perhaps it can be modified. More amp hours would definitely be a big plus. I assume they would have to be wired together. I have always carried 2 batteries but 1 is stored in the storage compartment.
The 6 volts have roughly (if not exactly) the same footprint as a 12 volt, but are significantly (about 2 inches) taller. This page is an example of a set of 6 volts wired in series. As opposed to two 12 volts that would be wired in parallel. The 6 volts always have to be wired together to attain 12 volts.

Don't forget that when comparing amp hours on 6 versus 12 volt batteries, the stated value on the 6 volt won't double like it will when wiring up two 12 volts. Two 6 volts at 220 AH each run in series will give you 220 AH. Two 12 volts at 85 AH each run in parallel will give you 170 AH. I hope that makes sense.
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Old 12-22-2010, 02:58 PM   #14
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That link just helped me a great deal. I probably would have wired them in parallel and screwed up everything. Thank you very much for all that information. If I can't fit them into my present battery compartment, I may add a few more and relocate them. Thats the great thing about the Designer, tons of storage space.
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Old 12-22-2010, 04:00 PM   #15
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Here is a picture of my conversion to two six volt golf cart batteries (Trojan T-105's). I had to cut the white plastic trays to allow the taller batteries to tilt enough to install, but I didn't have to cut them all the way down to the bottom as you can see from the photo. Please note the wiring was very simple and actually used one less wire than if I was hooking up two 12 volt in parallel. I used both white leads as you can see. The original leads from the Designer aren't visible unless you look real close in the shadows, but they are totally original including length.
For what it is worth, there is 1/8" clearance between the top of the top battery and the on/off switch. Close, but it does fit.
The tie down straps were the original ones provided by Jayco.
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2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof
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