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Old 09-15-2010, 09:23 AM   #1
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Battery Drain

New to me 2004 35 Winnebago Adventurer. I have noticed if I leave the coach sit for a day or two the coach batteries are down. I have check to make sure everything is off. I have tested it a couple times. I plug it in and have a good charge on the batteries. Then unplug for a few days and they are way down. I know I can shut the power down as you go in and there is a blade kill on the batteries but I figured I should be good for a few days.

It does have the rack of CB as you go in the door that seems to be powered all the time. Maybe I need to add a switch for the charger. I have to double check the inverter to see if I have that off. Pump is off and most everything I can think of is shutdown.

I guess I could have bad batteries but wonder if I'm missing something. It does have a solar panel and in the hallway the panel says its charging.

Craig
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Old 09-15-2010, 10:02 AM   #2
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There are phantom loads on house batteries that you should check...propane detector..co2 detector...clocks...radios...amplified antenna switch if left on...some refrigerators use power even though they are off..etc..Any one of these can kill batteries in a few days...Fully charge the batteries then turn your battery disconnect switch off and see what your reading is after a few days...12.6 volts is a fully charged battery...You should also check them with a hydrometer...Change them all if one is bad...
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Old 09-15-2010, 11:25 AM   #3
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Thanks for the ideas. Will charge up and then do the battery disconnect. I wonder what side of the disconnects the solar charger is on? I have the entry rocker disconnect and then right at the batteries.
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Old 09-15-2010, 11:31 AM   #4
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I'd vote for picking up a cheap battery specific gravity tester and taking a look at what it tells you. You could chase ghosts for a long time when you might just have worn out batteries.

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Old 09-15-2010, 11:37 AM   #5
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Batteries looked sealed. Not sure have to double check.
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Old 09-15-2010, 11:46 AM   #6
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Originally Posted by cef2lion View Post
Thanks for the ideas. Will charge up and then do the battery disconnect. I wonder what side of the disconnects the solar charger is on? I have the entry rocker disconnect and then right at the batteries.
Remove the batteries cables from the batteries. This way you have no confusion.
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Old 09-16-2010, 02:22 PM   #7
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Batteries looked sealed. Not sure have to double check.
Perhaps batteries are not true deep cycle house type unless they are "AGM's".
If not deep cycle they will drain much quicker.
Can you post more info (brand , model, quantity,etc.)?
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Old 09-16-2010, 03:09 PM   #8
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Perhaps batteries are not true deep cycle house type unless they are "AGM's".
If not deep cycle they will drain much quicker.
Can you post more info (brand , model, quantity,etc.)?
Good catch! Isn't it unusual for non-AGM Deep Cycle batteries to be sealed?

Also, speaking from experience, "maintenance free" batteries aren't always maintenance free. My chassis batteries were supposed to be but.....
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Old 09-16-2010, 10:22 PM   #9
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I would do as movin-on suggests. I had a similar condition last winter with the batteries disconnected via the shutoff switch. They would go down to 12.2 after a week. What I did was charge them up and then disconnected them from each other and the coach. One went down and the other remained at 12.6. That quickly identified the bad battery that was pulling the pair down. I ended up replacing both and moved the good one to my boat as a second battery.

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Old 09-17-2010, 07:02 AM   #10
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The batteries are the same. They are labeled Autocraft Marine Starting deep cycle. There is nothing at all on the top to open them up.

I'm going to do as suggested after using it this weekend. I will charge the batteries. Isolate them and take voltage readings. Followed by voltage readings afterward.

Thanks,

Craig
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Old 09-17-2010, 02:01 PM   #11
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So what does the battery cutoff switch NOT cut off? I've noticed the Propane detector - but what else? In my previous rig, a National, when I pushed that button EVERYTHING was dead. In my Winnebago my steps still work, as does the propane detector. Someone said the power antenna? Could the entertainment system items above the dash not be on the cutoff?
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Old 09-17-2010, 02:36 PM   #12
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The cutoff switch kills power to your house batteries not the chassis batteries if that is what you are asking...Items wired to your chassis batteries will still work...
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Old 09-17-2010, 02:37 PM   #13
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When I park the coach in storage. I put the switch at the entry on OFF and the same for the switch in the battery compartment. It appears that everything is off this way. No problems so far. Happy travels, Joe
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Old 09-17-2010, 08:51 PM   #14
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So what does the battery cutoff switch NOT cut off? I've noticed the Propane detector - but what else? In my previous rig, a National, when I pushed that button EVERYTHING was dead. In my Winnebago my steps still work, as does the propane detector. Someone said the power antenna? Could the entertainment system items above the dash not be on the cutoff?

The cutoff switch kills everything 12V in the coach area including the propane detector on my RV with the exception of the stairs. Even the inverter in the entertainment center so none of that will work either.

The chassis battery powers everything in the dash area including the tuner memory presets on the radio. This and the stairs plus any other fantom loads I'm not aware of put a small drain on the chassis battery over time. The 5 Watt solar panel connected to it can't keep up with the drain in the winter months here in the Northwest That is why I put a battery disconnect switch on the chassis battery.

I purchased it from my local Harbor Freight store.

Battery Disconnect Switch link

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