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Old 04-27-2013, 06:02 PM   #1
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House batteries question

Running on just house batteries w/inverter on. Readings on panel say 11.50 - so how low should I allow this to go before I fire up the generator?
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Old 04-27-2013, 06:06 PM   #2
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Now
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Old 04-27-2013, 06:34 PM   #3
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Yep, right now. You should not let deep cycle batteries get below 40% each time you do you shorten the battery life a little.
Here is a good chart. I got this from one of the forums but I don't remember which one.
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Old 04-27-2013, 07:10 PM   #4
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good chart - now
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Old 04-27-2013, 07:52 PM   #5
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Agreed..now! You really shouldn't go below 50% discharge or around 12.1V.
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Old 04-27-2013, 08:05 PM   #6
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I have that same chart taped to the side of my monitor panel.
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Old 04-27-2013, 08:17 PM   #7
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Shouldn't the batteries have no draw to get an accurate reading, like sitting idle to 90 minutes or so?

If I pull a heavy draw on my battery bank, I could see 11.6 for a few seconds...Then return to over 12.4..


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Yep, right now. You should not let deep cycle batteries get below 40% each time you do you shorten the battery life a little.
Here is a good chart. I got this from one of the forums but I don't remember which one.
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Old 04-27-2013, 08:29 PM   #8
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I agree with Us3here, but it gives me an idea of how close to 1/2 empty/charged they are.
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Old 04-28-2013, 08:14 AM   #9
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Shouldn't the batteries have no draw to get an accurate reading, like sitting idle to 90 minutes or so?

If I pull a heavy draw on my battery bank, I could see 11.6 for a few seconds...Then return to over 12.4..
Ideally yes. The chart is technically accurate only for batteries "at rest" I.e. with no load and having sat around for a while like that.

But it gets pretty close unless you're drawing a heavy load. If you're below 12V with most stuff in the coach turned off, it's generally time to recharge.
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Old 04-28-2013, 11:30 AM   #10
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Ideally yes. The chart is technically accurate only for batteries "at rest" I.e. with no load and having sat around for a while like that.

But it gets pretty close unless you're drawing a heavy load. If you're below 12V with most stuff in the coach turned off, it's generally time to recharge.
A very correct statement. Make sure you have an accurate meter. Do NOT rely on a $2.98 meter from a Warehouse supplier.
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Old 04-28-2013, 11:57 AM   #11
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I believe my AGS came factory set at around 12 volts -- I never saw a reason to change from that.

So, yeah, now would be good.
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Old 04-29-2013, 10:46 AM   #12
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A very correct statement. Make sure you have an accurate meter. Do NOT rely on a $2.98 meter from a Warehouse supplier.
For an excellent treatise on RV 12V systems see The 12volt Side of Life (Part 1)

This is a 2-Part text that will tell you more than you can understand in one reading.
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Old 04-29-2013, 04:07 PM   #13
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A very correct statement. Make sure you have an accurate meter. Do NOT rely on a $2.98 meter from a Warehouse supplier.
Why would someone spend THAT much money on a meter??? HA! Just kidding!!
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Old 04-29-2013, 04:30 PM   #14
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A very correct statement. Make sure you have an accurate meter. Do NOT rely on a $2.98 meter from a Warehouse supplier.
I probably have 5-6 around for general testing. A Fluke 117 True RMS when I get serious.
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