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12V Electronics

Dual Batteries


This is a discussion on Dual Batteries within the 12V Electronics forums, part of the TMC TRUCK & SUV category!
I had written a post a while back about a dual battery install I wanted to do. This is what ...

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Old 03-30-2013, 04:52 PM
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Dual Batteries

I had written a post a while back about a dual battery install I wanted to do. This is what the finished product would look like. (Minus the bar over the battery.) LOL

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I'm not sure if this project will take place next week or within the month etc. For now I will be using the old stock battery and then up grade to a second Optima. I will also be upgrading WAY down the road to a Power-Gate Single Rectifier Isolator. (REAL pricey for now.)

I have a 200 amp/100 amp idle alternator I have now and will use more 0 gauge wire. I plan on this breaker:

Click the image to open in full size.

between it and this battery isolator:

Click the image to open in full size.

and this holder and a 200 amp fuse between each battery:

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Does any one see any problems with my set up brand wise or other.

Thanks
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Old 03-30-2013, 07:29 PM
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Only problem I see is that you plan to remove that fender support. Put it back when you are done, it's there for a reason.
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Old 03-30-2013, 09:05 PM
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Yup. That bar is needed. Why the isolator?
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Old 03-31-2013, 10:04 AM
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Quote:
Originally Posted by daddy View Post
Only problem I see is that you plan to remove that fender support. Put it back when you are done, it's there for a reason.
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Originally Posted by Zembonez View Post
Yup. That bar is needed. Why the isolator?
Thanks I'll double check on that. I don't know if the majority of people who do this just don't bother to put the bar back in or if the batter is in the way. I bought the tray yesterday and will be installing it today or tomorrow so I'll set the battery in and see.

As for the isolator, I was under the impression (especially if you have miss matched or way different ages of batteries) that you separate to put less stress on either battery and the alt. Another is to assure no matter how much you drain one you have enough to start the vehicle with the other. I know generally if your wenching, running extra lights jammin' to tunes (whatever) your vehicle is running anyway.

I've read articles on both POVs isolated vs. in series. It might be one of those "6 of one 1/2 dozen of the other " things.

I'm still trying to figure how I want my lay out either way. I only have extra lights (for now) but, as I add amps,a wench, power invertor, etc. I would like a more evenly distributed load between the 2.
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Old 03-31-2013, 10:17 AM
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In series works well. Once they are charged, the alternator only maintains a charge. Unless you are going to be draining them without the engine running, I don't see any reason for the added expense or complexity... but it's YOUR truck!

EDIT: IN PARALLEL ONLY! Not series...
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Old 03-31-2013, 12:12 PM
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Dual Batteries

Wiring two 12 volt batteries in series will result in 24 volts to your system. I'm not sure that's the direction you should go.


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Old 03-31-2013, 12:51 PM
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Wiring two 12 volt batteries in series will result in 24 volts to your system. I'm not sure that's the direction you should go.


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HAHAHAHA!

UH. OOPS.

Obviously they need to be wired in parallel unless you want to start a new 24 volt module frying trend...
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Old 03-31-2013, 12:53 PM
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Dual Batteries

Lol


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Old 03-31-2013, 12:54 PM
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I say wire them up in seriallel and get the best both have to ffer.
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Old 03-31-2013, 01:00 PM
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That takes three batteries and one has to be 7 volts.
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