An open battery in a string- risks

solapawasolapawa Registered Users, Users Awaiting Email Confirmation Posts: 1
We got 64 batteries of 12v 100ah in a string. 1 of the batteries seem to have the total string voltage on its terminal as 400V. what could be the cause of this


  • BB.BB. Super Moderators, Administrators Posts: 30,737 admin
    At this point, it is a failed battery. And needs to be replaced. Having ~400-768 VDC across a failed battery is just asking for risk of fire (strike/sustain an arc across the failed internal connection).

    Longer term, have you been monitoring the battery bank (volt meter across each cell/battery to make sure all of the neighboring batteries are working correctly? If flooded cell batteries, have you been checking the specific gravity of the cells ~once per month (and electrolyte levels)?

    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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