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Old 06-02-2019, 10:36 PM   #1
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House Batteries

I have a 2017 BayStar 3124. The house batteries ( Interstate flooded acid ) are starting to lose their charge. That is they seem to not want to hold a charge. For example the batteries were purchased new in April 2017 and have been very reliable until recently. Today they are at 11.7. I suspect new batteries may be needed. I am hooked up to a thirty amp electric. What replacement batteries do you suggest? Something better than Interstate?
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Old 06-03-2019, 01:15 AM   #2
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Quote:
Originally Posted by fhmac View Post
I have a 2017 BayStar 3124. The house batteries ( Interstate flooded acid ) are starting to lose their charge. That is they seem to not want to hold a charge. For example the batteries were purchased new in April 2017 and have been very reliable until recently. Today they are at 11.7. I suspect new batteries may be needed. I am hooked up to a thirty amp electric. What replacement batteries do you suggest? Something better than Interstate?
Interstate batteries are fine and if properly maintained should certainly last longer than two years
How have they been maintained?(water levels and specific gravity checked regularly, batteries kept charged & desulfated).
What is the voltage reading after they've been fully charged then again after they've sat idle for 24 hours?
Are you sure your charging system is operating properly?
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Old 06-03-2019, 04:05 AM   #3
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If your hooked up to 30 amp service, you should be seeing 13.5 volts or more.

Make sure you leave your battery disconnect switch on ( Use position ) when on shore power.
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Old 06-03-2019, 04:36 AM   #4
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You can't go wrong w GCs for house... Read through this...
https://marinehowto.com/wp-content/u...le-Battery.jpg
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Old 06-03-2019, 04:58 AM   #5
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I have not had good service with Interstate batteries in he past, but, it sounds like you have a charging issue.
I am good at keeping my batteries serviced. My boat batteries are 6 years old and still performing. They are Continental from the same lot build and sequential serial numbers.
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Old 06-03-2019, 05:32 AM   #6
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Two-year-old batteries should still be fully functional if they've been maintained. Sounds like you're either pulling more out of your batteries than your charger can put back, your batteries have maintenance issues, or something in your power management system is not set properly.
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Old 06-03-2019, 05:59 AM   #7
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Hi fhmac,
Not sure how you are technically. Before you spend money on new batteries consider:
1. With a meter and the coach connected to shore power take a reading across the battery terminals. 13.5 + should be the reading. If no, stop there. You have a charging problem. Could be a variety of items. post here it you need additional info or call a mobile RV tech.

2. If #1 is okay, make sure the water level in the batteries is correct.
3. Connect an external charger to the batteries and fully charge them.
4. Purchase a battery load tester at the automotive parts store of your choice. Not expensive. My tester is 130 AMP rated
5. Make sure the batteries are fully charged.
6. Disconnect the external charger.
7. Disconnect the batteries from each other and the coach.
8. Follow the instructions that came with the tester. The test takes about 15 seconds per battery. The test will tell you if the batteries are bad. The test tells you the power in the battery. That is really what you want to know.

Gut feel says you have a charging problem with a component in the coach charging system.
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Old 06-03-2019, 07:23 AM   #8
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I am using 4 NAPA AGM batteries. They are five years old and work as well as new. I have not had good luck with Interstate but they are certainly not terrible. I agree that your charging and maintenance system must be out of kilter. If it is a good Zantrex or something similar. You can phone the company and get excellent specific tech help with proper setup and use. Read the manual or get one. Replace the charger if you must. Don't buy batteries until the charger is working well. After that you can see how the batteries are working and replace them of needed.
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Old 06-03-2019, 07:59 AM   #9
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Thanks to everyone for this input.
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