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Old 10-18-2018, 01:32 PM   #1
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Chassis Batteries C31

Mine are three years old and getting weak based on the low voltage at startup after sitting. Since we travel in the cold weather most of the time thinking about changing them. Currently they are AGM and will be going back with AGM.

Just changed the house batteries to Trojan 105 AGM

Saw C31 AGM at Sam's and wondered if anyone had used them as well

Would like to hear what worked for several years

Thanks
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Old 10-18-2018, 03:06 PM   #2
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You batteries may be fine. In cold weather, the intake air grid heaters run longer, suppresing the voltage untll they are done cycling.
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Old 10-18-2018, 03:38 PM   #3
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Its normal and expected behavior to sometimes get a low chassis battery warning upon starting the propulsion engine. There is a intake air heater that kicks in when starting the engine (takes the place of glow plugs). It pulls a lot of current and sags the chassis batteries. Soonest the engine starts the engine alternator charging recovers the batteries. As the batteries age you may see it more often.
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Old 10-18-2018, 05:10 PM   #4
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I have the Group 31 AGMs for my house batteries from Sams Club. In my 5th year and still performing well although I have 400watts of solar charging them. They are excellent batteries from my perspective. I have no experience with their starting AGMs however.
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Old 10-20-2018, 10:35 AM   #5
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Quote:
Originally Posted by twinboat View Post
You batteries may be fine. In cold weather, the intake air grid heaters run longer, suppresing the voltage untll they are done cycling.
You may be right, it does bounce back up, going to check it out on the November trip, thanks
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Old 10-20-2018, 10:41 AM   #6
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I have the Group 31 AGMs for my house batteries from Sams Club. In my 5th year and still performing well although I have 400watts of solar charging them. They are excellent batteries from my perspective. I have no experience with their starting AGMs however.
Thanks Bob, the battery they carry at our local Sam's is a dual purpose starting and storage. I don't know anyone in the area that has them installed. They have the stud and standard post. That is the one I was thinking about. Current batteries are just stud and AGM.

Based on the response from the post I am going to wait and see. With the new House batteries, starting in cold weather should be much easier/safer. We expect to be in weather with night temperature down to zero or so.

Just curious as to what to go back with. Havent seem much on the forums about the group 31's mostly the House batteries.
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