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Old 05-06-2012, 08:56 PM   #1
chopshop
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Group 24, 27 & 29 Batteries??

I'm looking to purchase a new battery for our trailer. It currently has one group 24 from the dealer. I was looking to purchase a group 29. I looked in my TT manual today under the battery section and it stated to use a group 27 battery only and nothing larger......... Anyone have any advise on this subject?

And also, what's the difference between the groups?
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Old 05-06-2012, 09:02 PM   #2
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Basically, the difference is amp-hour capacity and physical size. Group 29 being the largest of the ones you mentioned, on both counts. I'm going to guess, the group 29 may not physically fit the stock mounting location.
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Old 05-06-2012, 09:43 PM   #3
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I would use the largest battery that fits your box.
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Old 05-07-2012, 06:21 AM   #4
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Be aware of the weight and its impact on your tongue weight. The larger the battery, the heavier it gets.
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Old 05-07-2012, 07:48 AM   #5
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Based on the responses, the group size has nothing to do with with the converter. I would have to look it up again, but in the manual they made it sound as though a larger group size wasn't good for the converter. If anyone has any thoughts on the group size in conjunction with the converter, please advise. Thanks.
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Old 05-07-2012, 08:07 AM   #6
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I would suggest that the converter will take longer to charge the larger battery. Also, the newer converters from Progressive Dynamics have a "maintenance" function that automatically comes on every 21 hours. As a battery is increased in size, the effectiveness of this will diminish. It will not be a black and white answer, but rather shades of grey. If your converter is made by Progressive Dynamics, you may want to contact them for a more precise answer.
http://www.progressivedyn.com/all_in_one_pd4000.html
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Old 05-07-2012, 08:10 AM   #7
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Chopshop,

The type of camping you do may influence your next battery purchase. If the majority of your camping has shore power available, then IMO just consider a standard group 24 Marine/RV battery similar to your existing battery.

On the other hand, if your camping involves frequent boondocking (no shore power) then you may want to consider a "true" deep cycle battery (12V or 6V set-up). True deep cycle batteries cost more, but they have capacity and longevity advantages over a standard Marine/RV battery.

I'm not aware of a compatibility issue with a given converter/charger and a particular battery size..., other then a larger capacity battery may take longer to charge to full capacity. Many newer converter/chargers are three stage units (in lieu of two stage) and have enhanced charging characteristics.

Bob
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Old 05-07-2012, 09:55 AM   #8
Diesel Donnie
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Quote:
Originally Posted by chopshop View Post
I'm looking to purchase a new battery for our trailer. It currently has one group 24 from the dealer. I was looking to purchase a group 29. I looked in my TT manual today under the battery section and it stated to use a group 27 battery only and nothing larger......... Anyone have any advise on this subject?

And also, what's the difference between the groups?
As others have stated, your choices are multiple, dependent on how you use your rv- In our case, we had the space to install 4 6 volt deep cycle batteries- Obviously, we boondock more than others- The existing converter did a good job keeping the batteries charged so that was not an issue for us- We also had a 2k inverter so we could use limited 110 power [morning coffee is a must for us]- JMHO DD
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Old 05-07-2012, 11:08 AM   #9
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I can't see where the battery size would make a difference from the converter perspective. My guess is they recommend a size based on the battery box size. If you are willing to do some bracket mods and can take the additional tongue weight, then go for it.

Another option not as convenient - carry a spare battery in your TV if you can and hook up as needed.
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Old 05-07-2012, 03:36 PM   #10
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Terry,
Here is a more technical explanation;
Itís because of the source resistance of the converter vs the internal resistance of the battery.
Larger capacity batteries have lower internal resistance, and require a converter (charger) with a lower source resistance for the same performance. Larger capacity converters have that lower source resistance. Each has a range within which proper performance can be achieved, and sounds like his manual is drawing the line at group 27 size battery. Not that group 29 would not work at all, just the charging performance would be reduced to the point they donít recommend it.
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