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Old 01-26-2015, 11:02 PM   #15
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At 12.3 volts your batteries state of charge was around 65% when you started. Two hours of running the generator is not long enough to fully charge the batteries.
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Old 01-26-2015, 11:11 PM   #16
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2 years shouldn't be too old, our OEM Interstate U-2200's went just short of 10 years, but I added 4 oz of mineral oil to each cell when they were 2 years old. Always kept the fluid level right at the interior level markers.
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Old 01-26-2015, 11:19 PM   #17
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Your biggest problem was length of charge. It would take 10-12 hours to bring it from 65%.
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Old 02-06-2015, 12:37 AM   #18
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have been parked on shore power for several days now. As a test, I shut down the power post and left the coach for 6 hrs. Fridge running and gas furnace cycling. After 6 hours my coach batteries were at 11.85 volts. They started at 12.85

This is not what I should expect if these batteries were healthy, correct?

For review, these batteries were strong right out of winter storage. They ran slides in and out. They started the generator, etc.

As routine maintenance, I topped them off with distilled water to cover the cells completely. They have been like this ever since.
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Old 02-06-2015, 01:00 AM   #19
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Your biggest problem was length of charge. It would take 10-12 hours to bring it from 65%.
Yep, I run our gen set for two hours twice a day and that only brings the batteries to about 80%.
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Old 02-09-2015, 08:10 PM   #20
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I suspect you have a hidden current draw. If you don't have one, rent a DC clamp-on ammeter, clamp it on the positive cable to determine what's happening.
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Old 02-10-2015, 01:17 AM   #21
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have been parked on shore power for several days now. As a test, I shut down the power post and left the coach for 6 hrs. Fridge running and gas furnace cycling. After 6 hours my coach batteries were at 11.85 volts. They started at 12.85

This is not what I should expect if these batteries were healthy, correct?

For review, these batteries were strong right out of winter storage. They ran slides in and out. They started the generator, etc.

As routine maintenance, I topped them off with distilled water to cover the cells completely. They have been like this ever since.

I assume your reading of 12.85 was taken after you shut off the shore power. This is normal.
What was the battery voltage when plugged in? 13.5-13.8?

I also assume you are running a residential fridge and you only have four house batteries? If this is the case, I don't think a drop to 11.85 is out of line. Unless of course you have six house batteries.

The only way to confirm for sure would be to have them load tested. Not trying to talk you out of new batteries but hate to see you toss them if they are OK.


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Old 02-12-2015, 07:28 PM   #22
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11.85volts is a nearly dead battery. I started at almost 13 volts on TWO interstate 6 volt batteries. Running only the fridge and carbon monoxide units. Also let the furnace fan cycle about 6 times. In only a few hours, the batteries were almost dead.
I replaced them with 2 Excide brand 6 volt deep cycle batteries. Huge, heavy, tall things.
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Old 02-12-2015, 09:57 PM   #23
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have been parked on shore power for several days now. As a test, I shut down the power post and left the coach for 6 hrs. Fridge running and gas furnace cycling. After 6 hours my coach batteries were at 11.85 volts. They started at 12.85

This is not what I should expect if these batteries were healthy, correct?

For review, these batteries were strong right out of winter storage. They ran slides in and out. They started the generator, etc.

As routine maintenance, I topped them off with distilled water to cover the cells completely. They have been like this ever since.

I think you may be expecting too much from 2 6 volt batteries. You've got a total capacity of about 225 amp hours total and should never draw them down more than 50%. Given that you are most likely not starting from a 100% charge on batteries that have a few deep discharges on them, this may be normal. The RV frig is a power hog on electric. The 12 volt blower on the furnace is a pretty good draw also. Starting the generator may not mean anything. Most coach builders start the generator from the chassis batteries.


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Old 02-12-2015, 09:57 PM   #24
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2 batteries is not enough.
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Old 02-12-2015, 10:04 PM   #25
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2 batteries is not enough.
x2
I have 8 T105's for the house and 690 watts of solar, it will keep me going for 2 cloudy/wet days. You have 1/4 of that capacity and it will not get you through 1 night............. the voice of experience
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Old 02-12-2015, 11:27 PM   #26
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Buy a hydrometer and test each cell.

Wilmar W1653C Professional Battery Tester - Walmart.com
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Old 02-13-2015, 11:35 AM   #27
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He didn't say he had a residential fridge. Unless he swapped one in, a 2012 36LA has a "normal" RV fridge....
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Old 02-13-2015, 11:15 PM   #28
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Yeah, absorption fridge uses very little amp hrs. The 12 volt furnace fan uses about 3amp hours. My batteries were as charged as they were ever going to get as I already stated. So, to me, they are FULL. They went dead in a few hours. I have no unwanted draws, no bad connections, I have been all over the place with wrenches and meters.
Couldn't imagine not replacing the batteries, so I did. Now, they last like they are supposed to based on some limited testing.
With the new batteries, after several hours running fridge and furnace, I couldn't measure a decrease in charge.
Appreciate all the input... Done with thread..
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