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Electrical Discussion of preventative/corrective maintenance and other technical issues regarding your coach's electrical system.

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  #1  
Old 05-15-2018
1derer 1derer is offline
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Default battery abuse

A couple weeks after replacing my 4 house 6v golf cart batteries that all registered more than 6 volts each when new, I let somebody use the Bird for a couple weeks. When they got back I checked the batteries and found each had under 1 volt left. The water was down a trifle in a few cells (though still covering the plates). I immediately charged them and topped off the water.

I'm wondering if any damage has been done or if their life expectancy has been shortened. I related this to the battery store that said all is well. I also came across a web site that indicates there's at least two schools of thought, one counseling not to go below 50%, the other claiming discharging to 20% is ok for deep cycle batteries like GCs. Mine got down to a little under 10 %, but fairly briefly.

I'd like to hear what anybody's got to say about this.
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Old 05-15-2018
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Ed Wimberley Ed Wimberley is offline
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1derer
Any battery that has been discharged that low has been compromised not killed but damaged
It can recover but not back up to 100%.
Battery will still have have life remaining however it 100%.
Battery shops have newer testers that can give percentage of life remaining
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Old 05-15-2018
badandy badandy is offline
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The depth of discharge affects how many charge/discharge cycles you'll get unless it was really hammered bad. I would say to do an equalization charge (15 or 16 volts, find the spec sheet for your batteries!) to clean the plates and run them normally to see how they respond. I think they will be OK if they weren't left that way for a long time.
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Old 05-16-2018
Butch Charpentier Butch Charpentier is offline
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I wouldn't loan my Bird to anybody including my kids.
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Old 05-16-2018
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rtpn60 rtpn60 is offline
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Quote:
Originally Posted by 1derer View Post
I'm wondering if any damage has been done or if their life expectancy has been shortened. I related this to the battery store that said all is well. I also came across a web site that indicates there's at least two schools of thought, one counseling not to go below 50%, the other claiming discharging to 20% is ok for deep cycle batteries like GCs. Mine got down to a little under 10 %, but fairly briefly.

I'd like to hear what anybody's got to say about this.
Keeping the batteries above 50% (abouit 12.0v) will insure the a long battery life. Keeping them above 80% will result in the longest life possible. You can drain them to 20% but at the cost of shorter life (less cycles).

I always push the 50% rule for lead acid, wet or AGM.
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Old 05-16-2018
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Quote:
Originally Posted by Butch Charpentier View Post
I wouldn't loan my Bird to anybody including my kids.


I second that. I'll loan you my daughter before I loan you my bus.
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Old 05-16-2018
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Bingo,
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