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04-16-2020, 06:29 PM
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#1
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Junior Member
Join Date: Feb 2014
Posts: 1
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Country Coach 8D house batteries
Hi Everyone, I want to replace my 2 coach 8D house batteries and go with 4 6volts batteries can someone give a diagram as far as doing the batteries in parallel and if someone has a pic of this that would be great.
-Paul
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04-16-2020, 06:48 PM
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#2
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Senior Member
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 4,537
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A quick search got to this one first.
There are many others on the web.
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Dean
1995 38' CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
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04-17-2020, 06:22 AM
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#3
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Registered User
Join Date: May 2005
Location: Milford,CT.
Posts: 2,052
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04-17-2020, 06:41 AM
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#4
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Senior Member
Join Date: Jul 2014
Posts: 22,496
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Your have 2, 8 D batteries and they are already in parallel.
That cabling does not change.
All you need is 2 short jumpers to make 2, 6 volt batteries into one 12 volt battery.
The jumpers should be near the same thickness ( Gauge ) as the ones you have. 
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04-17-2020, 07:09 AM
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#5
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Member
Join Date: Aug 2015
Posts: 96
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I to have the 8d’s. What is the benefit of what you were doing?
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36’ 2000 CC Intrigue
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04-17-2020, 07:22 AM
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#6
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Registered User
Join Date: May 2005
Location: Milford,CT.
Posts: 2,052
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Quote:
Originally Posted by stonegully
I to have the 8d’s. What is the benefit of what you were doing?
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I would guess more AH,easier to handle due to weight,true deep cycle and can be found cheaper.
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04-17-2020, 07:28 AM
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#7
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Senior Member
Country Coach Owners Club Winnebago Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 36,841
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You can buy 12V deep cycle batteries. I went with 4 8D Lifeline AGM batteries. Give the same AH's as 6 volt deep cycles and require little to no maintenance.
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2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '14 Jeep JKU Dragon Edition
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04-17-2020, 08:12 AM
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#8
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Senior Member
Country Coach Owners Club
Join Date: Aug 2014
Posts: 146
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I am a touch confused. My 8d's are 240 AH at 12v. 2ea 6 volt batteries rated at 240 AH in series produce 12v@240 AH. In parallel they would produce 6v and 480ah so other than possibly price and handling I do not see an advantage. and perhaps a disadvantage in that you have more cable connections to go awry.
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Jim E
2007 Country Coach Affinity
2015 Jeep Grand Cherokee
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04-17-2020, 08:37 AM
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#9
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Senior Member
Join Date: Nov 2006
Location: Western NY
Posts: 2,925
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Quote:
Originally Posted by jwlce
I am a touch confused. My 8d's are 240 AH at 12v. 2ea 6 volt batteries rated at 240 AH in series produce 12v@240 AH. In parallel they would produce 6v and 480ah so other than possibly price and handling I do not see an advantage. and perhaps a disadvantage in that you have more cable connections to go awry.
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8Ds usually are not a true Deep Cycle batty - GC's are one of the best large volume, readily available, reasonably priced ($/AH) batteries available.
https://marinehowto.com/what-is-a-deep-cycle-battery/
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Don & Marge
'13 Newmar Ventana 3433 - '14 CR-V TOAD
'03 Winnebago Adventurer 31Y - SOLD
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04-17-2020, 09:06 AM
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#10
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Senior Member
Join Date: Aug 2010
Location: Over the next hill, around the next curve...
Posts: 4,768
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One of the things I've helped some owner's with, is the learning that you don't double the C20 AH ratings of X's 2 GC2 batteries. (Many thought that when connected together, the AH's added together to yield higher AH output then a 12V. (As has already been stated and explained, nope... They don't  !).
The other common reason for going to 6V over 4D or 8D batteries, is the weight to handle for installation is easier. (As has also already been stated !) Price, as in Costco and Samsclub or Walmart, is another incentive too...
Only the OP can tell his reason ! Looks like he joined IRV2 in 2014, but it looks like his first post(?) - so delayed welcomed !
Best to all,
Smitty
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Roo II is our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...
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04-17-2020, 10:14 AM
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#11
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Senior Member
Join Date: Jun 2016
Location: Minden nevada
Posts: 595
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Why do some isc coaches have 2 8D starting batteries ? Mine had 1 4D when I bought it but I have since replaced with an 8.D. I could pick up the 4D myself but not the 8D. Using 4 Costco golf cart for the living area.
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2002 country coach allure 32 foot dual slide 350 cummins ISC
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04-17-2020, 12:09 PM
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#12
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Senior Member
Country Coach Owners Club
Join Date: Apr 2015
Location: Alberta
Posts: 1,302
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Quote:
Originally Posted by Winemaker2
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The Lifeline 8Ds are true deep cycle. Clicky here.
My Discover Energy 8Ds are also deep cycle. Clicky here.
8D is simply a BCI (Battery Council International) designation - standardizes dimensions, and lug connections. Nothing to do with type of battery
__________________
Towr: 2007 Country Coach Allure 470 - 37 Sunset Bay Cummins 400 ISL
Toad: 2016 F150 King Ranch - 3.5L EcoBoost 4x4 Supercrew (curb weight 4,775 lbs)
Toad: SOLD 2007 Jeep Grand Cherokee (yes, it has a Hemi) (curb weight 4,720 lbs)
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04-17-2020, 02:48 PM
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#13
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Senior Member
Join Date: Nov 2006
Location: Western NY
Posts: 2,925
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Quote:
Originally Posted by BrianGlenn
The Lifeline 8Ds are true deep cycle. Clicky here.
My Discover Energy 8Ds are also deep cycle. Clicky here.
8D is simply a BCI (Battery Council International) designation - standardizes dimensions, and lug connections. Nothing to do with type of battery |
 I know there are both available out there but not everyone understands the difference and was the point of the post / link
Thanks for the links - good info.
I have AGM 8Ds in my boat now and thinking of switching to AGM GCs when it's time for replacement so allow a 1 man job vs needing a gang of friends to change them out.
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Don & Marge
'13 Newmar Ventana 3433 - '14 CR-V TOAD
'03 Winnebago Adventurer 31Y - SOLD
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04-17-2020, 04:18 PM
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#14
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Senior Member
Country Coach Owners Club
Join Date: Apr 2015
Location: Alberta
Posts: 1,302
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Quote:
Originally Posted by Winemaker2
I know there are both available out there but not everyone understands the difference and was the point of the post / link
Thanks for the links - good info.
I have AGM 8Ds in my boat now and thinking of switching to AGM GCs when it's time for replacement so allow a 1 man job vs needing a gang of friends to change them out. |
Thanks for replying. I went back and re-read and saw the word “usually”. Too late to edit my original post.
Love your username, btw.
Brian
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__________________
Towr: 2007 Country Coach Allure 470 - 37 Sunset Bay Cummins 400 ISL
Toad: 2016 F150 King Ranch - 3.5L EcoBoost 4x4 Supercrew (curb weight 4,775 lbs)
Toad: SOLD 2007 Jeep Grand Cherokee (yes, it has a Hemi) (curb weight 4,720 lbs)
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