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Old 09-24-2015, 05:24 PM   #1
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Battery replacement. Standard 12 volt or 6 volt

The standard 12 volt interstate battery has gone bad in my parents 2014 Forest River 8289WS TT.

Debating if I should replace the battery, replace the battery and add a second 12 volt battery or upgrade to two 6 volt cart batteries like I have on my toy hauler.

The trailer will be plugged in most of the time when it is being used but there will be times when power will not be available.

I am not familiar with the electrical setup on the forest river.

Can upgrading to two 6 volts cause any problems or void warranty?
Any opinions?

Thank you for your time
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Old 09-24-2015, 08:15 PM   #2
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Quote:
Originally Posted by Leichardti View Post
The standard 12 volt interstate battery has gone bad in my parents 2014 Forest River 8289WS TT.

Debating if I should replace the battery, replace the battery and add a second 12 volt battery or upgrade to two 6 volt cart batteries like I have on my toy hauler.

The trailer will be plugged in most of the time when it is being used but there will be times when power will not be available.

I am not familiar with the electrical setup on the forest river.

Can upgrading to two 6 volts cause any problems or void warranty?
Any opinions?

Thank you for your time
I wouldn't exactly call 2 x 6 vdc rather than a 12 vdc battery an upgrade. Given the room, I would go with two 12 vdc TRUE deep cycle batteries. Much more amp hrs available and they weigh less plus the core charges. IMHO, but that fits me and may not fit anyone else.
It shouldn't cause you any problems as it all looks the same to the converter and house. 12 vdc is 12 vdc regardless how you get there.
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Old 09-24-2015, 08:19 PM   #3
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Thanks for the info. Could adding a second deep cycle battery cause any warranty issues?
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Old 09-24-2015, 09:28 PM   #4
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Nope.
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Old 09-24-2015, 09:41 PM   #5
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Nope X 2
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Old 09-25-2015, 06:18 AM   #6
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Just be sure to wire 2x 12v in parallel, not series. You want "more 12v juice" not 24v
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Old 09-25-2015, 06:54 PM   #7
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Positive to positive (+to+) and negative to negative (-to-) use the same gauge wire as what's on the unit now. Probable single aught or 0. Insulate the terminals like what's on the batteries now
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Old 09-26-2015, 07:49 AM   #8
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Do a little research regardless which way you go on wiring them.

You will wire the 12V differently than the 6V. Both are simple but it's important to get it right.
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Old 09-26-2015, 09:11 AM   #9
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Quote:
Originally Posted by Leichardti View Post
The standard 12 volt interstate battery has gone bad in my parents 2014 Forest River 8289WS TT.

Debating if I should replace the battery, replace the battery and add a second 12 volt battery or upgrade to two 6 volt cart batteries like I have on my toy hauler.

The trailer will be plugged in most of the time when it is being used but there will be times when power will not be available.

I am not familiar with the electrical setup on the forest river.

Can upgrading to two 6 volts cause any problems or void warranty?
Any opinions?

Thank you for your time
I have done some research and a true deep cycle 6v battery has way more capacity than any 12v deep cycle battery. look at the 20hr capacity and the amp hrs it will deliver. If it was for my truck than I would look at the cold cranking amps. When it's time for me to change it will be 2 6v golf cart batteries in series = 12v. 2 decent 6v deep cycle batteries would definitely be an upgrade.
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Old 09-26-2015, 10:21 AM   #10
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but is it twice as much ?
If you put 2x 6v batteries, with say 80Ah capacity (random value) in series, then you get 12v at 80Ah, so 960Wh
If you put 2x 12v batteries, with say only 50ah capacity each in parallel, then you get 12v at 100Ah, so 1200Wh
The Amp-hour rating of the 12v batteries would have to be less than half of the capacity of the 6v batteries to make 2x 6v batteries be more effective than 2x 12v batteries

Now, if space or weight is a concern, then two high-capacity 6v batteries may make more sense than two average-capacity 12v batteries, since they might be close to the same power but the 12v batteries will like be larger and heavier
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