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Old 03-07-2010, 08:59 AM   #15
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Question 6v negative...

Is it not true?...one 6v dies and 'yer out'a luck!!
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Old 03-07-2010, 09:16 AM   #16
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Quote:
Originally Posted by ROBERT CROSS View Post
Is it not true?...one 6v dies and 'yer out'a luck!!
Pretty much. But if you only have one 12 volt battery, and a cell croaks, it also sucks to be you...
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Old 03-07-2010, 09:25 AM   #17
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Costco sells deep cycle batteries for much less than RV or battery stores. The golf cart batteries I bought there were only $70. They are made by Johnson Controls.
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Old 03-07-2010, 09:47 AM   #18
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Originally Posted by overlander63 View Post
Pretty much. But if you only have one 12 volt battery, and a cell croaks, it also sucks to be you...
Yes...but don't you need two 6v to make one 12v?

it would suck for you to be me.
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“After all these years the reason I continue to love Thanksgiving.....I still sit at the kids table.”
RLC

Sandra wanted to go to Cleveland on vacation,
but I’m the Husband, so we went to Cleveland.
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Old 03-07-2010, 09:57 AM   #19
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We have had the best luck with Auto Zone Duralast 12V marine duel purpose battery.
They have lasted us boondocking hard the best and are $$$ less than Optima.
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Old 03-07-2010, 10:06 AM   #20
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Had a 79 31' with 2 battery compartments with deep cycle Interstate batteries. To add extra capacity I installed 2 6v golf cart batteries in a battery box mounted between frame rails just behind propane tanks. Battery box was mounted on 2 pieces if 1" angle aluminum bolted to bottom of frame. You have to move propane tank mount 1" forward and re-weld to frame to fit. Should give you all the power you need for a weekend of boondocking. I bought battery box online from a supplier in Washington state. Ran 8ga wire from 6v thru vent for univolt to fuse panel. Worked well for me.
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Old 03-07-2010, 10:12 AM   #21
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Originally Posted by ROBERT CROSS View Post
Yes...but don't you need two 6v to make one 12v?

it would suck for you to be me.
Batteries are made up of a series of 2 volt cells.

A 6 volt battery has 3 and a 12 volt has 6 cells. There is nothing that can be done to alter that.

However, when you put batteries or lights as an example, in series, when one fails, they all fail, just like the old Christmas tree lights.

As an example, take 2 100 amp 6 volt batteries, 600 watts each and put them in series. You will have 12 volts at 100 amps, or 1200 watts.

Then take 2, 50 amp 12 volt batteries and put them in parallel. You will now have 12 volts at 100 amps, or 1200 watts.

The big draw back with the two 6 volt batteries in series is when one quits, your done. When batteries are in parallel, when one quits, you remove it, and you still have a source of power.

"IF" 2 six volt batteries was a better deal than two 12 volt batteries, Airstream would have switched to that many years ago.

The odds of power failure with 2 six volt batteries in series, is "TWICE" that of 12 volt batteries in parallel.

Twelve volt batteries are easily found, not so any more with 6 volt batteries.

Go to Costco, and see how many of each they have on display.

Lastly, more than likely a battery will fail when on a trip. With the 6 volts, your done, no matter what you do. Now your trip has a problem, because you will have to search for 2 batteries.

With the 12 volts, remove the bad one, and replace it when you get around to it, perhaps not until you get back home.

The only test equipment needed for the 12 volt battery setup, is a cheap volt meter.

Andy
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Old 03-07-2010, 10:15 AM   #22
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I purchase my batteries from an Interstate wholesale supply house locally. I usually get "blems" that have a scare on outter case, but batteries are new with warranty. Cost on the 2 12v were $30 each, 6v were $40 each. Beats the retail prices and allows you to repalce as necessary without breaking the bank.
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Old 03-07-2010, 10:25 AM   #23
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Pretty much. But if you only have one 12 volt battery, and a cell croaks, it also sucks to be you...
Why would you only have one 12 volt?
If you have room for two 6 volts. you've got room for two 12 volts.
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Old 03-07-2010, 10:29 AM   #24
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On my current 31, it had only a single battery. The external box hatch was intact but inner plastic box was missing. I bought 2 covers with plastic boxes from a wrecked 06 Classic. Had to modify the box to hatch connection due to angle of cover, but now have an enclosed battery box to contain battery gases from entering the cabin. The support wire on cover was too short to allow the hatch to open a full 90 degrees. this made fitting type 78 deep cycle from fitting. I had to lengthen it. The support wire was not really necessary because hatch will be stopped by frame a little over 90 degrees anyway. I am still contemplating wether I am going to put in the additional 2 pack of 6v batteries on this one.
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Old 03-07-2010, 10:34 AM   #25
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Do your batts have handles?

This is not the brand or style battery I use...(best picture though). I struggled with the same problem til I fastened a pull strap attached to the end of the battery where the handle is attached.
Lift up and slide out, it still ain't easy with a heavy AGM but it is doable..

...
Good idea. I am going to look into that. I use a strap horizontally around the battery, but your method looks like it would work better. I also have a thin piece of slick plastic to help the battery get up over the lip of the compartment.

Regards,
Ken
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Old 03-07-2010, 10:50 AM   #26
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Battery testing.

First of all, let me establish my credentials - I am not a battery expert and make no claim to be.

The only reliable way, that I am aware of, to test a battery's condition (not just whether it is charged or not) is to fully charge it and hook it up to a known value load. Then plot the voltage over time as it discharges. Compare that to the specifications. I have a device that does that. It connects to a laptop computer and plots a chart of the battery's performance. I have only used it a few times. What I learned is, that by the time I think it is worth doing, I pretty much know the battery needs to be replaced anyway.

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Old 03-07-2010, 10:51 AM   #27
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Originally Posted by w7ts View Post
Good idea. I am going to look into that. I use a strap horizontally around the battery, but your method looks like it would work better. I also have a thin piece of slick plastic to help the battery get up over the lip of the compartment.

Regards,
Ken
Yeah...that little 1/4" lip is a real PITA......I'll find that piece of plastic and give it a try, that with the lift strap==piece of cake.

Thanks....Bob
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Old 03-07-2010, 02:38 PM   #28
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Is the "Point" of a battery blade to disconnect it when connected to A/C?
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