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Old 11-21-2009, 10:32 AM   #1
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New batteries?

I am going to get new batteries for my 82 winnie brave. Right now it has 4 12v car batteries, 2 for the engine and to for coach. I want to get 2 new deep cycle batteries for the coach, but dont no if it would be better to get 4 new ones? And does anyone have any suggestions of what type of batteries to get?

thanks
Justin
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Old 11-21-2009, 10:47 AM   #2
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Hi Justin,
I used to have a 78 Brave. From your OP, my assumption is you need to replace the coach batteries. Consider getting 2 6 volt deep cycle batteries for the coach. One can purchase flooded (need to check and add water) or AGM (sealed, no water to check or add). The choice is personal preference. As far a capacity goes, buy the largest that will fit in the battery compartment.

If you do this, the new batteries will need to be wired in series. This is different that the wiring you have now (12 VDC wired in parallel). It's not difficult, post here if you need information.
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Old 11-21-2009, 11:03 AM   #3
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I didnt no I could go to 6v I thought i would have to stay with the 12v. Thats awsome cause the 6v have more amp hrs. Would it make any differance if the engine charges all the batteries when it is on? Whats about the trojan deep cycles I heard they were pretty good batteries?
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Old 11-21-2009, 12:14 PM   #4
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Hi Justin,
The 6 VDC batteries, wired in series, will provide you 12 VDC. The converter/charger and the engine should not care, if the batteries are wired in series. Trojan is a brand name. I've never used them. Go to The 12volt Side of Life (Part 1) to read about batteries for RVs. There are diagrams for correctly connecting the batteries.
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Old 11-21-2009, 12:18 PM   #5
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I didnt no I could go to 6v I thought i would have to stay with the 12v. Thats awsome cause the 6v have more amp hrs. Would it make any differance if the engine charges all the batteries when it is on? Whats about the trojan deep cycles I heard they were pretty good batteries?
As GaryKD said. if you use two 6 volt batteries you must connect them in series. wire the positive of one 6 volt battery to the negative of the other 6 volt battery. Then connect the original 12 volt battery positive post to the cable that was on the original 12 volt battery positive the 6 volt battery positive that you didn't use on the 6 volt battery and the negative cable from the original 12 volt battery to the 6 volt battery that doesn't have a cable on it. The two 6 volt batteries are connect in series and that series pair is then in parallel with the coach and chassis 12 volt systems.

Series and Parallel RV battery wiring

As for Trojan batteries, I have two and find they are twice as expensive and no better than the GC2 golf cart batteries from Sam's Club.
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Old 11-23-2009, 03:23 AM   #6
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Originally Posted by TheDubs View Post
I am going to get new batteries for my 82 winnie brave. Right now it has 4 12v car batteries, 2 for the engine and to for coach. I want to get 2 new deep cycle batteries for the coach, but dont no if it would be better to get 4 new ones? And does anyone have any suggestions of what type of batteries to get?

thanks
Justin
i am happy with my 2 6v gpl-6ct lifeline agm batteries hooked up in series for my coach system. i got them from bd batteries online about 18 mo. ago
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Old 12-01-2009, 09:39 PM   #7
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You also can get two Trojan 12v deep cycle batteries. Trojans are excellent batteries, I have 3 J-185H's for 645 Ah of power.
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Old 02-13-2010, 09:47 PM   #8
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2 6v and 1 12v?

We purchased our 09 Hurricane, we had them install our two trojans 6v in series then the rv tech offered to install the 12v. Can you do that? yes he replied 6v in series and the 12v parallel. They seem to work ok but I have a question? where would you hook up the smart charger? 2 6v in series then the 12v + to the end 6v+ and the 12v - to the other 6v -. Make since, I hink I'm getting confused? bill
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Old 02-13-2010, 11:12 PM   #9
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They seem to work ok but I have a question? where would you hook up the smart charger? 2 6v in series then the 12v + to the end 6v+ and the 12v - to the other 6v -. Make since, I hink I'm getting confused? bill
with a smart charger, you should disconnect the 12v battery and charge it separately. otherwise, one or the other battery sets will never reach full charge. it is ok to charge the 2 6v batteries hooked up in series with a 12v charger. 2 6v batteries in series looks the same as 1 12v battery to your smart charger. some folks do reverse the connections occasionally.
check this website:
www.dcbattery.com/faq.html#1
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Old 02-14-2010, 11:35 AM   #10
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For the house I would recommend 6 volt GC batteries as well.. Remember though when computing amp hours that you take six volt batteires in pairs. Each pair, is treated as though it were a single 12 volt battery (I like to say there are no six volt batteries in RV's because of this)

And two Interstate U-2200 230 amp hour six volt batteries.. Thus become one 230 amp hour 12 volt pair.. You add voltage when you wire them in series, NOT capacity.

Why do I like golf car batteries.. Mostly they give you the most bang for your buck as a house battery.. Long life in that type of service and low cost are their features.
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Old 02-14-2010, 12:13 PM   #11
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battries

Then 12v is a deep cell interstate, the 6v are showing sign of getting old. Have room for 3 batteries, rather then un-hook them to charge, what would yall say about buying two new 12v? This way I would have 3 12vs. And if I did this how would charge these? bill
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Old 02-15-2010, 12:11 AM   #12
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Then 12v is a deep cell interstate, the 6v are showing sign of getting old. Have room for 3 batteries, rather then un-hook them to charge, what would y’all say about buying two new 12v? This way I would have 3 12v’s. And if I did this how would charge these? bill
all 3 12v will charge from your converter so-so. if one is weaker, the other 2 will not charge as well.
remember, you can install agm batteries on their sides. you might have room for 4 6v agm batteries? weight may be a consideration also. my lifelines weigh 90# each. i actually have room for 4 lifelines in my battery box, but do not think my battery box can support the weight.
agm batteries rarely require an equalization charge.
before i bought my 6v lifeline agms, i had 2 12v flooded cell deka marine batteries hooked up in parallel. they did not charge equally while hooked up in parallel. the lower capacity battery took most of the charge.
i had to disconnect them frequently and charge them individually to do an equalization charge.
that is one reason i went with 2 large capacity 6v agm batteries.
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Old 07-08-2010, 07:05 PM   #13
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I am confused...

Hi All. New to the forum, and to RV's. I have just bought a 1999 Coachmen Mirada and it has one 12v battery for the coach and 2x 6v batteries in series for the levelling legs.

What I am confused about is that the batteries are simply a storage device for electrical energy. Why are 2x 6v in series better than 2x 12v in parallel? Surely 2x 12v must store more energy? I was hoping to put 3x 12v in parallel to maximise storage so I can free camp (I think you call it boondocking) for up to a week at a time.

I have also heard that the AGM batteries, apart from the no maintenance issues, also lose their charge much more slowly when not in use (1-3 % a month) compared with liquid batteries (3-10 % per week). Is this true in your experience?

As always, it is better to find answers from people who know the value of the saying "In theory, there is no difference between theory and practice, but in practice, there is".
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Old 07-08-2010, 09:49 PM   #14
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I would reccommend two or four (better) Trojan T-105 batteries. As has been previously posted they must be wired correctly and with the proper size wire.
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