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Old 08-18-2013, 12:11 PM   #1
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When to charge batteries

How low can the batteries discharge before they must be recharged?
Also, what voltage do most of you set your AGS on to recharge your batteries?

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Old 08-18-2013, 12:26 PM   #2
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What batteries do you have, and how many? Answers may vary with the battery type and vendor.

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2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
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Old 08-18-2013, 04:53 PM   #3
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I can not give you the voltage, however there are lots of charts (google: 12 volt side of life) that will I will give you state of charge.

True DEEP CYCLE like the common six volt pairs 50%
Marine/Deep Cycle (common 12 volt sold for RV use) 70-75%
Starting batteries, 80%

Footnote: Though the six volt pairs are the most COMMON true deep cycle.. They do make True Deep Cycle 12 volt batteries as well.. I have seen some suitable for RV use and used some that...... Well.. let's just say they were more than my RV could carry.. but they worked well.
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Old 08-18-2013, 05:21 PM   #4
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I have four true deep cell batteries. They are six volt.
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Old 08-18-2013, 05:36 PM   #5
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Here is a chart I copied from another post. I unfortunately do not remember the original poster to give credit. I do not go below 50%
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Old 08-18-2013, 05:44 PM   #6
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I just set the AGS to come on when needed...it decides when/what voltage.
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Old 08-18-2013, 05:45 PM   #7
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I can give an answer but I also have a question.

12 V is normally considered minimum usable voltage or 50
% capacity, but that is always measured "at rest". At rest normally means no charge/discharge for 30 minutes.

I have read several threads Re: auto gen start. On my MH with 4 6V golf cart batteries, starting the Micro thru the inverter will draw 110 amps DC dropping the voltage to 11.5 volts immediately. Of course as soon as I turn off the micro the battery voltage returns to a higher value. Of course my Norcold with two heating elements draws 5 amps AC and 50 amps DC thru the inverter which also causes a substantial voltage drop.

What this means is that the battery voltage might be a poor indicator of when the genny should start. In practice it appears that any time you turn on an AC appliance the genny will start.

I guess if you set 11.5 V as the trigger level you will be safe but if you only have minimal drain on the batteries, the voltage might actually be 11.5 before start which might be to low.

Rereading the above I see I might be creating more confusion than help but possibly more feedback will clear the air.


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