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Old 05-11-2023, 14:59   #1
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House batteries not holding charge

I replaced 4 deep cycle batteries 4 months ago . They are 6 volt lead acid wired in series - parallel. While on maintenance charge dockside try suddenly dropped well below the 12 -13 volt range and the smartcharger shutdown not being able to read the voltage.Why will they not recharge beyond 7 volts ?
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Old 05-11-2023, 16:04   #2
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Re: House batteries not holding charge

Only thing I can think of is water level. Did you check that?
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Old 05-11-2023, 16:37   #3
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Re: House batteries not holding charge

Battery charger is faulty
Battery charger wired back to front
Batteries have been flattened to below 9V (often a smart charger will not charge them when they are that flat - one potential solution is get a 12 V start battery that is charged, wire the battery charger to both the start battery and the house bank, the start battery will fool the charger and it will put out 14V to the whole system. After a while disconnect the start battery. If your house batteries will will not hold a charge after that they probably can not be revived.) There are You Tubes on this method, it may not be the best solution but it worked for me on a dead battery that would not charge.
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Old 06-11-2023, 04:28   #4
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Re: House batteries not holding charge

Quote:
Originally Posted by Battermatter View Post
While on maintenance charge dockside try suddenly dropped well below the 12 -13 volt range and the smartcharger shutdown not being able to read the voltage.Why will they not recharge beyond 7 volts ?
I've read a portable charger can sometimes bring fully discharged batteries back up to the level where a smart charger will begin to work again.

You probably need to work out why they went south while you were on shorepower, presumably with your onboard charger in float mode.

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Old 06-11-2023, 04:46   #5
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Re: House batteries not holding charge

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While on maintenance charge dockside try suddenly dropped well below the 12 -13 volt range
Short circuit or something left on somewhere that is drawing power. Disconnect the batteries from your boat draws and see if the votage bounces back up.
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