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Thread: Battery testing

  1. 01-29-2019 09:47 PM #1
    Colwyn D
    Colwyn D is offline Senior Member
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    Battery testing

    I have 4 group 31 agm's as a house bank and would like to test them as I believe one may be failing. Is there a way to test battery capacity/health when the specific gravity of the acid cannot be taken?
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  2. 01-29-2019 09:53 PM #2
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    oscarvan
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    Re: Battery testing

    https://www.amazon.com/Calculated-Industries-8715-AccuMaster-Resistance/dp/B07CL8RPDS/ref=sr_1_21?ie=UTF8&qid=1548816768&sr=8-21&keywords=battery+tester

    A    side from that, you can charge them completely, and then fully disconnect them and simply measure voltage over time.... Should stabilize at 12.6 after about an hour. If one starts dropping faster than the others, there's your problem. Does not guarantee the others are 100% though, but if they fail this test they ARE bad.
    Last edited by oscarvan; 01-29-2019 at 09:55 PM.
    1978 53' Motor Yacht "LADY KAY V"
    Hull number 524
    Chesapeake Bay
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  3. 01-29-2019 10:15 PM #3
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    Boatsb
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    Re: Battery testing

    Pulse tech makes a nice unit for about $250.00
    Scott
    41C117 "Hattatude"
    Port Canaveral Florida.


    Marine Electronics and Electrical Products Distributor.
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  4. 02-04-2019 02:35 AM #4
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    Reefgeorge
    Reefgeorge is offline Senior Member
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    Re: Battery testing

    You fully charge the batteries. Knock off the surface charge with a light load, then isolate each battery and apply a known high load, monitor the voltage and compare the result to the battery spec:

    https://www.amazon.com/OTC-3180-Batt...ry+load+tester

    Many battery issues are the result of charging issues so make sure that your system is capable of getting all of the batteries to 100% charge level.

    George
    Florida
    2002 Cabo 47
    MAN mechanical 800/8's

    "You can avoid reality, but you cannot avoid the consequences of avoiding reality"
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  5. 02-04-2019 05:12 AM #5
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    oscarvan
    oscarvan is offline Senior Member
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    Re: Battery testing

    And.....when was the last time they were equalized?
    1978 53' Motor Yacht "LADY KAY V"
    Hull number 524
    Chesapeake Bay
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