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Old 08-01-2015, 03:29 PM   #1
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Default 50 percent agm voltage

hey smart people- i have a question about AGM batteries.

what voltage is considered 50 percent -just wondering
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Old 08-01-2015, 04:05 PM   #2
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Would it be different from other batteries? (which would be about 12.0) Or is that your question that I can't answer...
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Old 08-01-2015, 06:16 PM   #3
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Old 08-01-2015, 06:53 PM   #4
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Where did you get that voltage chart? It does not match the data from Lifeline AGM that I have. The 100% voltage on Lifelines is 12.8V.
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Old 08-01-2015, 06:59 PM   #5
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There are alot of variations on this chart online. Just google "battery voltage chart" and you'll see tons. I consider them a rough approximation at best.
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Old 08-01-2015, 07:17 PM   #6
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Here's a chart I found on Phillips Industries site. It was part of some load testing instructions which wanted to ensure that you recharged the battery if below 75% state of charge before load testing the battery.

Phillips State of Charge chart flooded and agm.JPG
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Old 08-01-2015, 10:02 PM   #7
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how low is an agm battery if an inverter sounds alarm at 10.5 and shuts off at 10 volts
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Old 08-01-2015, 10:45 PM   #8
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how low is an agm battery if an inverter sounds alarm at 10.5 and shuts off at 10 volts
It all depends on how much current the inverter and loads are taking out of the battery at that time.
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Old 08-01-2015, 10:59 PM   #9
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Here is a chart from Lifeline that shows what the voltage will read at a given state of charge, when being discharged at various rates.

This is a very useful chart for setting low voltage cutouts and alarms.

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File Type: jpg Lifeline volts vs discharge rate.jpg (87.4 KB, 48 views)
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Old 08-01-2015, 11:03 PM   #10
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how low is an agm battery if an inverter sounds alarm at 10.5 and shuts off at 10 volts
Low enough to destroy your battery I would think.
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