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 > Battery charge

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Yuma

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Posted: 04/17/20 11:24am Link  |  Quote  |  Print  |  Notify Moderator

My TT has been plugged in 30 amp shore power for two months . Water level is fine when I tested the voltage it was 12.54 which is a little over 75% .My question is why did it not test 100% full. The battery is only one year old. Thanks for your help

naturist

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Posted: 04/17/20 11:31am Link  |  Quote  |  Print  |  Notify Moderator

Battery voltage only gives you a useful reading if the battery is not hooked up to anything. If there is any drain, at all, the voltage will drop in proportion to the draw, and give you a false reading. If you want an accurate reading, you have to disconnect one terminal and give it 5 minutes or so to rest/stabilize. If you tested the voltage while the battery was still connected to the converter, there are draws, not least of which is the converter itself.

If your test was done with such a disconnection, now you do have a mystery.





Lwiddis

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Posted: 04/17/20 11:43am Link  |  Quote  |  Print  |  Notify Moderator

Is your converter a good one?


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2oldman

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Posted: 04/17/20 12:15pm Link  |  Quote  |  Print  |  Notify Moderator

What does it test with the charger on it?

garym114

Bluff Dale, Texas

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Posted: 04/17/20 02:06pm Link  |  Quote  |  Print  |  Notify Moderator

Your charger should supply a float voltage of around 13.2 -13.4 volts for a lead acid battery. If that 12.5 voltage was measured with the charger on and the battery connected the float voltage is to low from your charger.


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wopachop

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Posted: 04/17/20 05:32pm Link  |  Quote  |  Print  |  Notify Moderator

Sure its not as simple as your battery disconnect switch turned off?
Unplug the trailer and toss on some lights. Then plug the trailer back in and measure battery voltage again.

ken56

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Posted: 04/17/20 07:57pm Link  |  Quote  |  Print  |  Notify Moderator

Was having the same issue and turned out to be the converter. 75% is enough to make everything work but its not a strong full charge. Your converter is not doing its job properly. If you can afford it and your converter is a WFCO change it out for a Progressive Dynamics one of suitable size for your trailer. Save youself future problems now.

time2roll

Southern California

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Posted: 04/17/20 10:00pm Link  |  Quote  |  Print  |  Notify Moderator

If you measured 12.54 volts while plugged in you have a problem. Could be the converter is shot, lose connection, open fuse, open switch. Need to find the problem.


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2oldman

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Posted: 04/18/20 08:07am Link  |  Quote  |  Print  |  Notify Moderator

Drive-by post.

CarnationSailor

Carnation,WA

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Posted: 04/18/20 10:05am Link  |  Quote  |  Print  |  Notify Moderator

I am going to assume that you read the voltage with the trailer unplugged and everything turned off in the trailer. If this was the case, there are numerous battery charge tables on the web that indicate 12.54 volts to be about 95% charged, and anything over 12.6 volts is considered to be 100%. I don't think you have a problem.


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