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Old 04-01-2010, 11:51 AM   #31
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space is not a cooncern as there is plenty of room in the front comparment to fit the batteries, just the battery box size and venting is the concern. Also if the CCA and MCA are not numbers to use, how can i compare deep cycle batteries?
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Old 04-01-2010, 12:30 PM   #32
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space is not a cooncern as there is plenty of room in the front comparment to fit the batteries, just the battery box size and venting is the concern. Also if the CCA and MCA are not numbers to use, how can i compare deep cycle batteries?
CCA and MCA refer to how much power can be delivered in a very short amount of time "burst" to start an engine and have no relevance to RV use. True deep cycle batteries are not used to start engines and therefore are rated in Amp Hours. You want the highest Amp Hour rated battery you can afford.

A typical single Group 24 or 27 battery supplied with RVs will typically have between 70-105 amp hours of storage. Compare to 2 Trojan T-125 6V batteries with 240amp hours. More than double.

If you haven't yet visited the 12 Volt Side Of Life you really should as it will answer a lot of your questions in detail.
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Old 04-01-2010, 02:24 PM   #33
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ok i visted the page, and understand what it is saying however i need a baseline to go from, is there a "amp hour" rating on my curent battery? I want to make sure I at least double it. If it happens to be one of those "bigger" deep cycle batteries with 120 amp hours then it is not worth the money to me to install to 2 regular deep cycle batteries and only gain 25 amp hours
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Old 04-01-2010, 05:00 PM   #34
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I think this is the way the chart reads.

The HD24-DP will supply 11.6 amps for 5 hours.

The DCM-24 will supply 16.4 amps for 5 hours.

There is no true amp hour reading on the chart. 11.6 x 5 hours equals 58 amps per hour, and 16.4 x 5 hours equals 82 amps per hours. But if you notice, the further out you go, the total decreases with the 15 and 25 hour columns. So I figure that a true amp hour for the batteries should be above the multiplied results of the 5 hour column.....if that makes sense. A true amp hour for the DCM is above 82. The chart is probably a little more realistic than just showing just amp hours.......are you going to use 82 amps all up in 1 hours......probably not........it is going to be over time.
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Old 04-01-2010, 07:05 PM   #35
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Ampere hours (Ah)
Tested at 80 degrees Fahrenheit. It is the amount of current (in amps) a battery can deliver, multiplied by the amount of hours, without falling below 1.75 volts per cell (10.5 volts on a 12-volt). Most marine/RV-deep cycle batteries are rated on a 20-hour discharge rate. Example: a 100 Ah battery can deliver 5 amps for 20 hours (amps x hours = Ah).



So based on this, if I am understanding the math right I have a 58 Amp/Hour Battery?
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Old 04-01-2010, 09:37 PM   #36
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So based on this, if I am understanding the math right I have a 58 Amp/Hour Battery?
Basically yes but I would be surprised if it is that low, I would bet it's closer to 70 but remember that the numbers are effected by temperature too.

Also consider that 6volt golf cart batteries (Trojan T105, 125, 145 and others) are true deep cycle batteries and can better withstand a deep discharge and the resultant re-charge cycle than a starting/deep cycle battery. This is the reason they are so widely used in RVs for dry camping.
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Old 04-02-2010, 07:49 AM   #37
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Ampere hours (Ah)
Tested at 80 degrees Fahrenheit. It is the amount of current (in amps) a battery can deliver, multiplied by the amount of hours, without falling below 1.75 volts per cell (10.5 volts on a 12-volt). Most marine/RV-deep cycle batteries are rated on a 20-hour discharge rate. Example: a 100 Ah battery can deliver 5 amps for 20 hours (amps x hours = Ah).

So based on this, if I am understanding the math right I have a 58 Amp/Hour Battery?
Thanks RSL.......looks like I was reading the chart bass-ackwards.

58 hours makes sense.
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Old 04-02-2010, 02:43 PM   #38
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OK so I have decided on going with 2 intersstate gc-2 batteries with 232 amp hours each. I have a contact who will give them to me at his dealer cost so they are going to run about $70 each. i figure 464 amps hours will last at least a couple of days rnning the heat, much more then my 58 amp hour capicity. Next problem what do I do about a big enough battery box?
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Old 04-02-2010, 03:08 PM   #39
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OK so I have decided on going with 2 intersstate gc-2 batteries with 232 amp hours each. I have a contact who will give them to me at his dealer cost so they are going to run about $70 each. i figure 464 amps hours will last at least a couple of days rnning the heat, much more then my 58 amp hour capicity. Next problem what do I do about a big enough battery box?
Since the GC-2s are 6 volt batteries, you need to wire them in series, and I don't think the amp hours double in that case. Only when you have 2 12 volts wired in parrallel does the amp hours double. You still gotta a lot of power there.
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Old 04-02-2010, 03:51 PM   #40
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ok yes you are right amp hours dont double, still need help on battery box(es)
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