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Old 10-17-2018, 07:50 PM   #1
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Need Battery Help

We have a 2006 Monaco Diplomat. We've been plugged into shore power for the last couple of months. Yesterday we moved & stopped overnight at Walmart. As soon as we arrived we had low battery lights flashing on our panel & our readings were 10.5. started the generator right away & ran til it got to float charge. When we turned it off, the battery voltage dropped right away. We figured the batteries were shot (4.6 years) so today we bought new batteries (4 - 6V golf cart batteries). the voltage dropped quickly & we figured they might not have been well charged so we started the generator. Just turned it off at float charge & the battery voltage dropped again to about 12.3. Anyone have any suggestions as to what might be going on. We got a new inverter/charger about 6 months ago. TIA
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Old 10-17-2018, 08:31 PM   #2
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There may be a tripped Reset button on the inverter/charger.
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Old 10-17-2018, 10:45 PM   #3
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Reset it but doesn't seem to make any difference.
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Old 10-18-2018, 06:14 AM   #4
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Look for something that has a high draw, running off the inverter. Water heater, engine block heater, portable electric heater....

You could also see if turning off the inverter stops the voltage from dropping.
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Old 10-18-2018, 06:22 AM   #5
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Can you read the voltage right at the batteries. You should be seeing from 13-15 volts. Do you know if the inverter/charger worked when it was first changed 6 months ago?
Do you have a meter/shunt so that you know the amp draw at all times.
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Old 10-18-2018, 06:52 AM   #6
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You may want to check the water level in those batteries.
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Old 10-18-2018, 07:16 AM   #7
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New batteries are reading higher now but I suspect you have not charged them nearly long enough. If you have four batteries it could take four hours or more to come close to being full depending on the charger.

It takes me two hours in the am and two in the evening to keep my four batteries up to speed. That is after they are charged properly in the first place. My charger can put out 100 amps.
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Old 10-18-2018, 09:18 AM   #8
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Quote:
Originally Posted by karencollins View Post
Reset it but doesn't seem to make any difference.
What make and model of inverter do you have? It could be that the inverter was not set up properly to fully charge your batteries.
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Old 10-18-2018, 05:06 PM   #9
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Ran the generator all night, still had the same problem this morning. Found an RV shop to take us. They said they checked everything & best they could come up with was a bad solenoid, which they changed. We'll see what happens. It's about time to charge them. We have a Magnum Energy Inverter.
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Old 10-18-2018, 09:36 PM   #10
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Ok, Ran the generator again this evening. got it to 13.6 & as soon as I turned off the generator it dropped to about 12.4. after about 2 hours it's still at 12.2. Obviously, it wasn't the selonoid. any other thoughts.
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Old 10-18-2018, 09:58 PM   #11
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karencollins said:

"We got a new inverter/charger about 6 months ago"

Were you having the same problem before? Is that why you replaced the inverter?
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Old 10-18-2018, 10:22 PM   #12
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At this point I would start to divide and conquer. Get the battery as charged as you can. Then pull all 12 volt fuses, make sure you note which one came from each socket. Monitor the battery voltage with a meter directly on the battery terminals. If the voltage drops, recharge and pull the ground off the battery, plus any other leads on that post. Monitor again, unless there's a bad battery, the voltage should not drop. Now reattach the battery ground.

How many leads are stacked on the pos battery post? Can you ID the cable that goes to the 12 volt fuses panel? If so attach only that one and add one fuse back in at a time. You may have a circuit that is draining the battery, this should find it.

If you have multiple leads on the Pos post anyone of them could be the problem.



This will take some time but should pinpoint the problem, or keep on throwing money at the problem one thing after another.
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Old 10-19-2018, 06:13 AM   #13
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This article might help you better understand what needs to happen. Of course, Handy Bobs #1 rule is you need to have a quality meter/shunt. With a proper battery meter you will always know what is going into and out of your batteries. The problem you're likely experiencing is that you can have quality components but if they aren't hooked up correctly or something isn't setup right than the whole system doesn't work.

For what it's worth. Your last description 12.4 than 12.2 after two hours could be totally normal. Let's say you pretty much have the batteries charged (80% or so) but you're trying to run a residential fridge and some other draw that's using the batteries. 12.2 displayed (might be higher after a rest period) could be about right.

https://handybobsolar.wordpress.com/...ging-puzzle-2/
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Old 10-19-2018, 07:20 AM   #14
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What items are you running. For example, is your refer running on DC or is it a residential running on an inverter? Is it the original and is running on propane?

If you have an inverter, NOT converter then turn the inverter off for a couple of hours and monitor.

If you have the original light bulbs in the ceilings how many of those do you have one? Those things are power hungry and you have over 20 of them in the coach.

You can easily run a bank of four batteries down in a couple of hours if you have lots ot lights on and something running off an inverter.

Our 2008 Endeavor 40 footer was used for boondocking the first five years of life. The large tv and lights drew a lot of current.

Where are you taking those voltage measurements. If not at the battery then they are not telling the real story.
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