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Old 04-29-2015, 09:20 PM   #1
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Adding second battery

If I want to add a second battery do I just put them in parallel with each other and the converter will charge them together or is it more complicated than that?


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Old 04-29-2015, 09:28 PM   #2
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While it is pretty much that simple, it can get complicated when you start talking about the "best" way to do it. What you describe will work just fine.
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Old 04-29-2015, 09:41 PM   #3
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Nope. It's pretty much just that simple. :-) The only thing you really want to watch out for is ensuring that the cable runs are equal in length. The converter/charger with be charging both batteries at the same rate.
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Old 04-30-2015, 12:40 AM   #4
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HMmm... That sounds familiar. I would still like to know the drawbacks to adding a second battery
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Old 04-30-2015, 12:59 AM   #5
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Adding second battery

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Originally Posted by doitdaily View Post
HMmm... That sounds familiar. I would still like to know the drawbacks to adding a second battery

I can't think of anything other than space or maybe if weight was a concern. Jerry


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Oh and make sure it's the same battery and close to the same age as the current battery. A new battery ran in parallel with an old battery will lessen the lifespan of the new one.
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Old 04-30-2015, 01:06 AM   #6
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HMmm... That sounds familiar. I would still like to know the drawbacks to adding a second battery
The only drawback to a second battery that I could even think of would be weight. You might be looking at adding another 60-70 pounds. If you are only using a battery while driving from A to B, it's probably not needed, but a full 24 hours without hook-ups might leave you in a pinch without the additional capacity.
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Old 04-30-2015, 07:11 AM   #7
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Nope. It's pretty much just that simple. :-) The only thing you really want to watch out for is ensuring that the cable runs are equal in length. The converter/charger with be charging both batteries at the same rate.
AND the positive from the camper goes to the positive of the first battery and the negative from the camper's frame goes to the last battery in the stack to keep the battery usage (charge/discharge) equal.

The wires in between the batteries should be exactly the same length and gauge; as well as the heaviest you can buy to keep the current loss between batteries as low as possible. The OEM wires to the converter and the frame don't matter as they are properly sized for the camper's current draw. The middle graphic implies that the camper wires also need to be equal length, but that is not correct.

As stated before, the only "drawbacks" are weight and cost. They also must be replaced in pairs if a two battery stack (all 4 if a 4 battery stack) when even one goes bad to keep the stack balanced.
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Old 04-30-2015, 07:34 AM   #8
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Herk,

That first picture won't work for me.


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Old 04-30-2015, 08:09 AM   #9
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There seems to be two different post at the same time asking the same Question? Maybe the moderators can combine them. It's called adding a second 12v battery. All answers are equally important.
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Old 04-30-2015, 10:12 AM   #10
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Herk,

That first picture won't work for me.


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The first photo is a screen shot from the attached PDF. You can read it there.
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