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Old 02-10-2016, 08:03 PM   #1
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Best Value True Deep Cycle 12V Battery

Hi All:
My dealer equipped my trailer with a marine-type deep cycle battery which I ruined by completely discharging it a few times (I am new to RVing!). I do not want to make the same mistake again, and would like to modestly upgrade my boondocking capacity for overnight stays at Walmart.

Does anyone have suggestions for *economical* true deep cycle 12V batteries? I do not need more than a full day's capacity for the water pump and furnace. I do not want to go the 6V in series route because of the added tongue weight. A single true 12V deep cycle that I could occasionally discharge below 50% would be ideal.

I am going to install a low voltage disconnect and manual cutoff switch, so I am hoping to get a few years out of the next battery.
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Old 02-10-2016, 09:38 PM   #2
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might want to check on a Optima yellow top battery. Little costly but works good. Had one in my Jeep and never had a problem.
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Old 02-10-2016, 09:49 PM   #3
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Trojan Battery has several deep cycle 12 v batteries depending on how much capacity you want.

24TMX 1.13 kWh 47 lbs
27TMH 1.54 kWh 61 lbs
31XHS 1.73 kWh 67 lbs
T-1260 1.86 kWh 78 lbs
T-1275 1.99 kWh 82 lbs

As your TT probably came with a BCI Group Size 24 battery you will need a larger battery box for all but the 24 TMX battery. As you can see from the above list the capacity of a lead acid battery is directly proportional to the weight.
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Old 02-10-2016, 10:23 PM   #4
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Thanks for the info, I did not realize that Trojan made 12v deep cycles. My understanding is that traditional flooded cell deep cycles should not be discharged below 50% and AGM deep cycles can be discharged to 80%.

Trojan makes 12 AGM deep cycles, should I consider them? If I do a comparison, the AGMs are relatively cost effective given an 80% discharge versus 50% for flooded.

Quote:
Originally Posted by ODH View Post
Trojan Battery has several deep cycle 12 v batteries depending on how much capacity you want.

24TMX 1.13 kWh 47 lbs
27TMH 1.54 kWh 61 lbs
31XHS 1.73 kWh 67 lbs
T-1260 1.86 kWh 78 lbs
T-1275 1.99 kWh 82 lbs

As your TT probably came with a BCI Group Size 24 battery you will need a larger battery box for all but the 24 TMX battery. As you can see from the above list the capacity of a lead acid battery is directly proportional to the weight.
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Old 02-10-2016, 10:51 PM   #5
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The AGM batteries have a lower energy storage capacity (kWh) than the lead acid batteries for the same BCI size. Therefore you only get about 20% more energy out of them at the 80% discharge point. AGM batteries have other characteristics that may or may not be important to you, but for the same size they will cost more.
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Old 02-11-2016, 12:55 AM   #6
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I have a group 31 AGM battery on my TT now but still have the group 24. I was also given two brand new 6 volt golf cart batteries that I transport in my truck and hook up if I am dry camping more than a few days. AGN batteries cost more but require less maintenance.
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Old 02-11-2016, 12:03 PM   #7
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Quote:
Originally Posted by motorbreath View Post
Thanks for the info, I did not realize that Trojan made 12v deep cycles. My understanding is that traditional flooded cell deep cycles should not be discharged below 50% and AGM deep cycles can be discharged to 80%.
Here is the Trojan AGM Life Cycle Chart and why you do not want to take an AGM to 80%

Don
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BATTERY - AGM Life Cycle Chart Graph.jpg  
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Old 02-12-2016, 10:48 AM   #8
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I've had very good service from Interstate G24 batteries. Never had one fail.
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Old 02-12-2016, 04:16 PM   #9
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trojan and optima are not what I would call economical... heard lots of good about interstate deep cycle and Costco for the price.
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Old 02-12-2016, 06:20 PM   #10
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I have a pair of Interstate 6V Deep Cycle batteries going on 5 years old, preformed great......., about 60% boondocking.

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