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 > Adding a 2nd battery

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jodiesel2

Apple Valley, CA

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Posted: 01/20/19 03:08pm Link  |  Quote  |  Print  |  Notify Moderator

While dry camping in chilly weather it became apparent that I needed a second battery. I purchased an identical battery to the existing. I'll be routing large diameter cables to connect the 2 together via the posts. These units have both automotive posts and studs. All of the trailers connections are on the studs. My question is, should I split the trailer's connectors between the two batteries or keep them all connected to one battery?

Thanks


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twodownzero

NM

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Posted: 01/20/19 03:19pm Link  |  Quote  |  Print  |  Notify Moderator

You should split the trailer's connectors to make them draw more evenly. Also, if your current battery is more than a year old, I highly recommend that you change both of them, and if you have space, buy a real deep cycle battery or batteries rather than another RV battery.

Lwiddis

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Posted: 01/20/19 05:07pm Link  |  Quote  |  Print  |  Notify Moderator

Are your units true deep cycle batteries?


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nayther

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Posted: 01/21/19 07:47am Link  |  Quote  |  Print  |  Notify Moderator

twodownzero wrote:

You should split the trailer's connectors to make them draw more evenly. Also, if your current battery is more than a year old, I highly recommend that you change both of them, and if you have space, buy a real deep cycle battery or batteries rather than another RV battery.


Everything I've read says no. Connect the two in parallel, then the ground from one goes to the trailer ground and the other battery positive goes to the trailer "load" I've heard it referred to as "balanced" that way. Also if you're first battery is very old, or has been mistreated you may not get as much out of the added one as you'd like. And like twodownzero said, buy true deep cycle batteries or two 6 volt golf cart batteries.


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Farmboy666

Pisgah Forest, NC

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Posted: 01/21/19 08:56am Link  |  Quote  |  Print  |  Notify Moderator

Hook the batteries together in parallel and run everything form that. I would start with 2 new deep cycles.

bighog01

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Posted: 01/21/19 05:42pm Link  |  Quote  |  Print  |  Notify Moderator

2 New 6 volt batteries ran parallel is the way to go.

Dirtclods

Newport Beach

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Posted: 01/21/19 06:25pm Link  |  Quote  |  Print  |  Notify Moderator

Great info

http://marxrv.com/12volt/12volt.htm

lincster

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Posted: 01/22/19 06:22am Link  |  Quote  |  Print  |  Notify Moderator

2 6V's will solve your heater problem overnight.


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Farmboy666

Pisgah Forest, NC

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Posted: 01/22/19 06:57am Link  |  Quote  |  Print  |  Notify Moderator

bighog01 wrote:

2 New 6 volt batteries ran parallel is the way to go.

You have to run them in series to get 12v.

dedmiston

Valencia

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Posted: 01/22/19 10:35am Link  |  Quote  |  Print  |  Notify Moderator

bighog01 wrote:

2 New 6 volt batteries ran parallel is the way to go.


I think you mean serial, not parallel. If you connect them parallel, you'll just have one long-running 6v system instead of 12v.


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