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Old 06-27-2022, 04:56 PM   #1
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RV Batteries

have a 1995 safari ivory class a with the bigger cummings engine, what chasse
battery's are you using . looks like the battery's that came with it are all deep cycle. cab and chasse.
Thanks IN advance, Charles
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Old 06-27-2022, 05:22 PM   #2
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Not sure about engine batteries, but coach need to be at a minimum AGM’s.

You also need to check your convertor and make sure it is not an old linear design (MagnaTek is one of the brands) - they cook your batteries.

Take a look at replacing with a 4 stage microcontroller based convertor - Progressive Dynamics and a few others make drop in replacements for the old designs. Best price I’ve gotten for a PD the two times I’ve bought is Amazon.
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Old 06-27-2022, 10:51 PM   #3
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A lot of diesels use group 31 HD Industrial /Farm batts. Look like deep cells and have studs.
https://www.menards.com/main/tools/a...026994&ipos=22
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Old 06-29-2022, 03:10 PM   #4
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Typical would be a pair of 900-1000 CCA 12v batteries, which would likely be the Group 31 case size. Some coaches of that vintage used the somewhat larger 4D size, rated around 1200 CCA.


If you don't ever expect to be starting the engine at sub-freezing temperatures, you can save some $$ by buying a lower CCA rating (CCA is measured at 0 F). Plain CA, sometimes called MCA (Marine Cranking Amps), is measured at 32 F. That's usually more than sufficient for a motorhome battery.
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Old 06-29-2022, 03:59 PM   #5
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Quote:
Originally Posted by Gary RVRoamer View Post
Typical would be a pair of 900-1000 CCA 12v batteries, which would likely be the Group 31 case size. Some coaches of that vintage used the somewhat larger 4D size, rated around 1200 CCA.


If you don't ever expect to be starting the engine at sub-freezing temperatures, you can save some $$ by buying a lower CCA rating (CCA is measured at 0 F). Plain CA, sometimes called MCA (Marine Cranking Amps), is measured at 32 F. That's usually more than sufficient for a motorhome battery.
Gary's advice is sound.

When our MH was new to us and our first diesel, the engine start batteries died when boondocking. With more experience I would have know that they were not cranking up to par. At the same the voltage regulator went out on our generator but fortuately has a old portable generator to fully charge the relatively new 4 GC2 house batteries. Used the 'boost switch' to start the engine.

When we finally got to Costco it was close to closing time and I got two smaller start batteries than was installed because that is what they had.

These batteries are now 4 years old. While I try to avoid cold weather, at one stop it was about 20 degrees F when I started a cold engine with out plugging the engine heater in.

In summary, you need two large start batteries for the diesel. My coach has 4 GC2 deep cycle batteries that can assist via the 'boost switch' assuming they are not delpleted from camping.
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Old 06-30-2022, 05:25 AM   #6
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If they fit, many owners report 10 yrs from GP31 commercial . The warranty is only 12-18mo though.
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