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Old 04-16-2012, 08:51 AM   #1
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charging my house bateries

I was dry camping this weekend, and woke up Sat. am with dead house batteries...I started my generater to charge my batteries but was not sure how long I needed to run Geni. to get the batteries fully charged. Does anyone have any idea how long it takes to charge these batteries?

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Old 04-16-2012, 08:59 AM   #2
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Depends on the capacity of the batteries. My experience ranges from 1 -3 hours, depending how dead I've killed them. If you have a control center, it will show you charge rate - when it gets down to 4 amps you're probably good to go.

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Old 04-16-2012, 09:27 AM   #3
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Originally Posted by Old Navy View Post
Depends on the capacity of the batteries. My experience ranges from 1 -3 hours, depending how dead I've killed them. If you have a control center, it will show you charge rate - when it gets down to 4 amps you're probably good to go.
I agree. My four golf cart batteries with 440 amp hours of capacity would be useable shortly after the generator started. It will probably never fully recharge the batteries, but will get them to 90%.

Never having done the above from a dead battery status, I would think at least 3 hours or more to get to 90%.
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Old 04-17-2012, 09:31 AM   #4
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To fully and completely charge a battery takes 8 to 12 hours. This is needed at least once a week for battery health.

With a proper bulk charge at up to 4 watts per pound of battery, you can charge a healthy battery up to almost 90% of full in a few hours. If you monitor charging current, you'll see it get down to just a few amps after a while as 'Old Navy' notes. That is when the charger switches from bulk to the absorption stage and starts filling in the final 20% of so.

For 12v systems, you shouldn't let your batteries go below 12.0v as measured after no significant charging or discharging for at least a half hour. Letting them get below that really shortens battery life and increases the odds of battery failure.
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