RV Trip Planning Discussions

Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login

Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 02-18-2019, 11:37 AM   #1
Senior Member
 
Monaco Owners Club
Join Date: Apr 2015
Posts: 296
New battery cables ?

I just bought 4 6V deep cycle batteries to replace the 2 4D 12 V batteries. Do I need to replace the existing cables that link all the batteries together and if so what gauge ? ThanksClick image for larger version

Name:	20190108_152145.jpeg
Views:	51
Size:	55.9 KB
ID:	235356Click image for larger version

Name:	20190108_152123.jpeg
Views:	54
Size:	87.2 KB
ID:	235357
__________________

__________________
Chuck and Robbin Harrison....plus 2 PB and a G Pyrenees Max,Zenie and Smokie ! 1998 38' Monaco Dynasty Duke with a 8.3 Cummins. Everyday truck is a 2010 F150 XLT 4x4 and 2016 Ford Escape. TOAD is 2004 VW Bug Conv.
Migkiller is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 02-18-2019, 11:42 AM   #2
Senior Member
 
450Donn's Avatar
 
Join Date: Jun 2006
Location: Dallas,OR
Posts: 2,871
Measure how much you need, go to a welding supply store and buy the length of 0 or 00 welding cable you need. Go buy a quantity of lugs and either get them soldered on or find someone who can swage them on. Welding cable is very flexible, so its easy to handle.
__________________

__________________
Don and Lorri
2007 Dodge 3500 dually
Resident Dummy.
450Donn is offline   Reply With Quote
Old 02-18-2019, 11:59 AM   #3
Senior Member
 
oscarvan's Avatar
 
Join Date: Feb 2017
Posts: 431
Yeah they look like they could be a little tired. Reason you want to consider new ones is because over time the strands corrode up the insulation and that creates resistance which then creates HEAT. And heat is bad.

Also you're going from 2-12V parallel to 4-6V, so you'll need to make two pair (2x2) in series, and then parallel them. If you don't know what that means find someone who does. There's a description of that on my blog of my BMK install and it does explain this. https://dragonship.blog/battery-monitoring-kit/

So, you will need MORE cables than you have now. You can order the parts on line and make them. There's 12,568 you tube videos on how... or you can order them pre-made on Amazon, or you can call these people and they will advise you and make them.

https://www.custombatterycables.com/

As far as size.... sounds like this is a house and not a starting bank so a 1 or 1/0 oughta be more than plenty. If they are not maintenance free batteries, ie need watering, make sure to size and route the cables so you can get the caps off.
__________________
2017 Berkshire 38A
https://dragonship.blog/
oscarvan is offline   Reply With Quote
Old 02-18-2019, 12:05 PM   #4
Member
 
Join Date: Nov 2018
Posts: 36
Use what you can and already have but you will need extra cable to link the 4 batteries instead of 2. You probably already know, but remember that 2 of the 4 6 volt batteries will be in series then parallel the 2 that are in series.
randyrv is offline   Reply With Quote
Old 02-18-2019, 12:17 PM   #5
Senior Member
 
Eyephoto's Avatar
 
Winnebago Owners Club
Georgie Boy Owners Club
Join Date: Aug 2015
Posts: 474
Quote:
Originally Posted by 450Donn View Post
Measure how much you need, go to a welding supply store and buy the length of 0 or 00 welding cable you need. Go buy a quantity of lugs and either get them soldered on or find someone who can swage them on. Welding cable is very flexible, so its easy to handle.
I have two cars that are on the 6v pos ground system. I made the mistake of buying 12v cables. ot or double ot cable is the way to go. 12v cable cannot carry the amperage needed.
__________________
'99 Ultimate Freedom, UKQ38KD, on a Freightliner chassis, trailer towing a 1950 Crosley Station wagon, or a '42 Pick-Up. Member of the Non-Affiliated Camping Group FMCA #F462997 RVM #146 Jon & Ellen
Eyephoto is offline   Reply With Quote
Old 02-18-2019, 12:20 PM   #6
Senior Member
 
oscarvan's Avatar
 
Join Date: Feb 2017
Posts: 431
Quote:
Originally Posted by Eyephoto View Post
I have two cars that are on the 6v pos ground system. I made the mistake of buying 12v cables. ot or double ot cable is the way to go. 12v cable cannot carry the amperage needed.
There really is no such thing as a "12V cable" but you are correct about the theory, except that it sounds like a house bank so no starter load. 2/0 would be a little unwieldy considering he has to make 6 cables.....
__________________
2017 Berkshire 38A
https://dragonship.blog/
oscarvan is offline   Reply With Quote
Old 02-18-2019, 03:14 PM   #7
Senior Member
 
Monaco Owners Club
Join Date: Apr 2015
Posts: 296
All the cables are 4/0 gauge. The charger/inverter is 2/0. I used wire to layout the connections...does it look right ? Laying out the batteries like they are was the only way I could get them to fit in the box.Click image for larger version

Name:	20190218_162934.jpeg
Views:	61
Size:	70.2 KB
ID:	235383Click image for larger version

Name:	20190218_152237.jpeg
Views:	51
Size:	71.4 KB
ID:	235384Click image for larger version

Name:	20190218_152213.jpeg
Views:	48
Size:	72.9 KB
ID:	235385Click image for larger version

Name:	20190218_160011.jpeg
Views:	45
Size:	52.1 KB
ID:	235386
__________________
Chuck and Robbin Harrison....plus 2 PB and a G Pyrenees Max,Zenie and Smokie ! 1998 38' Monaco Dynasty Duke with a 8.3 Cummins. Everyday truck is a 2010 F150 XLT 4x4 and 2016 Ford Escape. TOAD is 2004 VW Bug Conv.
Migkiller is offline   Reply With Quote
Old 02-18-2019, 03:19 PM   #8
Senior Member
 
Monaco Owners Club
Join Date: Apr 2015
Posts: 296
Quote:
Originally Posted by 450Donn View Post
Measure how much you need, go to a welding supply store and buy the length of 0 or 00 welding cable you need. Go buy a quantity of lugs and either get them soldered on or find someone who can swage them on. Welding cable is very flexible, so its easy to handle.
Thanks...I will go find a welding store in Knoxville . The existing cables say 4/0
__________________
Chuck and Robbin Harrison....plus 2 PB and a G Pyrenees Max,Zenie and Smokie ! 1998 38' Monaco Dynasty Duke with a 8.3 Cummins. Everyday truck is a 2010 F150 XLT 4x4 and 2016 Ford Escape. TOAD is 2004 VW Bug Conv.
Migkiller is offline   Reply With Quote
Old 02-18-2019, 03:32 PM   #9
Senior Member
 
Monaco Owners Club
Join Date: Apr 2015
Posts: 296
Quote:
Originally Posted by oscarvan View Post
Yeah they look like they could be a little tired. Reason you want to consider new ones is because over time the strands corrode up the insulation and that creates resistance which then creates HEAT. And heat is bad.

Also you're going from 2-12V parallel to 4-6V, so you'll need to make two pair (2x2) in series, and then parallel them. If you don't know what that means find someone who does. There's a description of that on my blog of my BMK install and it does explain this. https://dragonship.blog/battery-monitoring-kit/

So, you will need MORE cables than you have now. You can order the parts on line and make them. There's 12,568 you tube videos on how... or you can order them pre-made on Amazon, or you can call these people and they will advise you and make them.

https://www.custombatterycables.com/

As far as size.... sounds like this is a house and not a starting bank so a 1 or 1/0 oughta be more than plenty. If they are not maintenance free batteries, ie need watering, make sure to size and route the cables so you can get the caps off.
Thanks for the links...very informative ! You have a nice rig there !!!
__________________
Chuck and Robbin Harrison....plus 2 PB and a G Pyrenees Max,Zenie and Smokie ! 1998 38' Monaco Dynasty Duke with a 8.3 Cummins. Everyday truck is a 2010 F150 XLT 4x4 and 2016 Ford Escape. TOAD is 2004 VW Bug Conv.
Migkiller is offline   Reply With Quote
Old 02-18-2019, 04:49 PM   #10
Senior Member
 
oscarvan's Avatar
 
Join Date: Feb 2017
Posts: 431
OK, other eyes please look at this and correct me if I'm having a brain fart...

The best way I can fit this for you, and hope your connections are long enough is like this....

2-6V #1+#2 in series makes 1-12V....think of this as ONE 12V battery 1+2 now.
2-6V #3+#4 in series makes 1-12V....think of this as ONE 12V battery 3+4 now.

To parallel those two "12V batteries":

Connect the outside Negatives of 1+2 and 3+4
Connect the outside Positives of 1+2 and 3+4

Connect House Negative to an outside negative
Connect House Positive and Inverter Positive to an outside Positive

I see only ONE negative connection to the house so I assume the inverter negative is connected to chassis ie the ONE negative is both house and inverter.

If in your photo you are connecting the House Negative to the CENTER negative of a pair... this will NOT work. The series connection should be in the center of a pair, the 12V connections on the outside of a pair.
Attached Thumbnails
Click image for larger version

Name:	Screen Shot 2019-02-18 at 6.43.56 PM.png
Views:	34
Size:	31.2 KB
ID:	235393  
__________________
2017 Berkshire 38A
https://dragonship.blog/
oscarvan is offline   Reply With Quote
Old 02-18-2019, 04:57 PM   #11
Senior Member
 
oscarvan's Avatar
 
Join Date: Feb 2017
Posts: 431
One more thing.... I STRONGLY suggest you invest in a multi meter and that you wire the batteries together and then VERIFY voltages as you puzzle it together.
__________________
2017 Berkshire 38A
https://dragonship.blog/
oscarvan is offline   Reply With Quote
Old 02-18-2019, 05:03 PM   #12
Senior Member
 
Monaco Owners Club
Join Date: Apr 2015
Posts: 296
Quote:
Originally Posted by oscarvan View Post
OK, other eyes please look at this and correct me if I'm having a brain fart...

The best way I can fit this for you, and hope your connections are long enough is like this....

2-6V #1+#2 in series makes 1-12V....think of this as ONE 12V battery 1+2 now.
2-6V #3+#4 in series makes 1-12V....think of this as ONE 12V battery 3+4 now.

To parallel those two "12V batteries":

Connect the outside Negatives of 1+2 and 3+4
Connect the outside Positives of 1+2 and 3+4

Connect House Negative to an outside negative
Connect House Positive and Inverter Positive to an outside Positive

I see only ONE negative connection to the house so I assume the inverter negative is connected to chassis ie the ONE negative is both house and inverter.

If in your photo you are connecting the House Negative to the CENTER negative of a pair... this will NOT work. The series connection should be in the center of a pair, the 12V connections on the outside of a pair.
My bad here on the photos ! Only use the top photo that has the green wires as a reference. I had to turn around #3 so I could get the positive coach cable to reach a positive post. Thanks
__________________
Chuck and Robbin Harrison....plus 2 PB and a G Pyrenees Max,Zenie and Smokie ! 1998 38' Monaco Dynasty Duke with a 8.3 Cummins. Everyday truck is a 2010 F150 XLT 4x4 and 2016 Ford Escape. TOAD is 2004 VW Bug Conv.
Migkiller is offline   Reply With Quote
Old 02-19-2019, 04:53 AM   #13
Junior Member
 
Join Date: Aug 2018
Location: Sumter, S. C.
Posts: 24
What 450don said. The larger the cable the better. One can't hardly get too big
flattire101 is offline   Reply With Quote
Old 02-19-2019, 05:20 AM   #14
Senior Member
 
spdracr39's Avatar


 
Monaco Owners Club
Join Date: Jul 2016
Location: Cabot, Arkansas
Posts: 1,305
Size your cables to your master circuit breaker size and the distance it is from the batteries
. My cables are short and I have a 200 amp breaker so I used 2/0. You never want your wire size to be rated for less than the protection device is rated for or a meltdown could occur before it trips.

https://www.bluesea.com/resources/1437
__________________

__________________
2004 Beaver Monterey Laguna/2015 Chevy Equinox
2014 Chaparral 327RLKS 5'er (FOR SALE)
2017 GMC 2500HD SLE 6.0L Z71 4x4 Standard Bed
https://wordpress.com/posts/enjoying-life.net
spdracr39 is offline   Reply With Quote
Reply

Tags
battery, cable



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
How to run new battery cables to new inverter/charger wlf00 RV Systems & Appliances 7 11-15-2018 08:27 AM
Battery Cable Size (jumpers not same as main battery cables) CountryB Class A Motorhome Discussions 16 02-26-2018 05:26 PM
New Battery Cables Bigd9 RV Systems & Appliances 4 01-05-2016 11:38 AM
New Battery Cables?? sgtjoe MH-General Discussions & Problems 2 09-23-2011 10:02 AM
Battery Cables Against Air Line Old Scout Alpine Coach Owner's Forum 4 11-12-2007 03:34 PM

» Featured Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 03:01 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.