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Old 04-23-2016, 11:10 PM   #1
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Battery Replacement- 12V vs 6V, WFCO replacement

Our 2006 Sunseeker 3100SS seems to have weak batteries. The unit has two 12-volt batteries of indeterminate age, connected in parallel. Whoever installed them did not remove the little month/year indicators, but the thick layer of dirt shows them to be a bit old.

The batteries are nominally at 11.9 volts but dropped down to 10.9 when we started the television, a Jensen 28-inch 12V model.

We're contemplating replacing them, but are undecided on using 12V batteries in parallel, or 6V batteries in series. I've read on the forums until my eyes went bleary, but cannot see a clear benefit one way or another.

We're also thinking of replacing the WFCO 8955 with a Progressive Dynamics unit. The WFCO only generates 13.1 volts; the truck engine generates 13.6V. After looking at a YouTube movie of someone replacing his WFCO with a PD4655 the job looks less intimidating than I originally thought.

Any thoughts, on either 12V vs 6V, or WFCO replacement?

K-R.
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Old 04-23-2016, 11:30 PM   #2
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Battery Replacement- 12V vs 6V, WFCO replacement

11.9 on the batteries is about 40% charged-not good. You may have a dead cell in one of them.

So...big question is do you dry camp more or usually hook up?

If you mostly dry camp, go with the 6v's as they will give you more ampre hours capacity then go with progressive dynamics 4655- I have done the switch from WFCO and a dramatic difference in power output for charging batteries when we are dry camping.

If you mostly hook up, save your money and keep the WFCO but get 2 new 12v's like group 31's.




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Old 04-23-2016, 11:47 PM   #3
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Old 04-23-2016, 11:48 PM   #4
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Originally Posted by HONDAMAN174 View Post
11.9 on the batteries is about 40% charged-not good. You may have a dead cell in one of them.

So...big question is do you dry camp more or usually hook up?

If you mostly dry camp, go with the 6v's as they will give you more ampre hours capacity then go with progressive dynamics 4655- I have done the switch from WFCO and a dramatic difference in power output for charging batteries when we are dry camping.

If you mostly hook up, save your money and keep the WFCO but get 2 new 12v's like group 31's.
Don't know, just yet. This is our first RV, and we've owned it for five months. I'd like to keep my options open, either way. So it looks like 6V batteries and the 4655 charger.

On a recent trip to a county park for three days/two nights we had to run the generator on the second morning. I like the 4655's fast-charging capability.

K-R.
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Old 04-24-2016, 12:04 AM   #5
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Battery Replacement- 12V vs 6V, WFCO replacement

The 6v would be a good choice if you have the room. Just have to decide if you want 2 or 4. A lot of people here like the trojen brand.

The progressive upgrade would be a smart choice regardless. It will put out high amps when needed and actually saves the batteries by desulfate ing them automatically when plugged in. I am glad I made the switch


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Old 04-24-2016, 12:29 AM   #6
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Mount your new Progressive converter within 2-3 feet of the battery.

Most campers, including mine, have the power converter 25 feet away from the batteries running via 6 gauge wire. Too thin of wire and too long of distance often means that the batteries will NEVER charge to 100% due to voltage drop form wire length and gauge.
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Old 04-24-2016, 01:14 AM   #7
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On our Sunseeker the converter is under the bed on the left side of the unit and the batteries are directly across on the right side, for a cable length of about 7 or 8 feet.

In the battery compartment is a fat red cable heading toward the converter. I'm sure it's bigger than 6-gauge, it looks like a small garden hose. Haven't seen the other (converter) end of it but I assume it goes all the way.

The replacement I'm thinking of is a board that replaces the WFCO board, so it would be the same 7-8 feet distance.

Thanks for all the advice.

K-R.
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Old 04-24-2016, 08:10 AM   #8
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If you are positive that the WFCO only generates 13.1 volts then you should definitely replace it. 13.1 will never give you enough charge current to get the batteries to full charge. I agree with the other posters, get it as close to the batteries as you can and make sure that you have at least #4, even for the 7 foot run. You will probably never see the full 55 amps from the new converter but you need every last volt to keep your batteries up to charge. My converter is 22 feet from the battery bank and is #6. Most I have ever seen from my 70 amp PD is maybe 35 amps and 14.1 volts. Not happy with either of these numbers.

All things being equal I would use two 6 volt batteries in series. Trojan's are the best but there are others that are equivalent.
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Old 04-24-2016, 08:30 AM   #9
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Down side to 6V systems is if you drop a cell, you're not putting out 12V. Desulfators are unproven read Answer To The Question: Battery Desulfators - Do They Work? - Blog | Impact Battery Blog (from a forum member). Double check your WAFCO's output, at initial output, not connected to your current spent battery set-up, if it is putting out 14+ V. If thats the case, why replace something that works, just dsayin'
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Old 04-24-2016, 09:47 AM   #10
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Down side to 6V systems is...
While that is certainly true, if you have 2 12 volt units in parallel and you drop a cell, the good battery will discharge into the damaged battery. There is really no simple win here.
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