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Lead acid batteries

Rob Eagle

Is there any limit to how long a lead acid battery can continuously supply a load, this is assuming that the capacity of the battery is capable of supplying the load for the period of whatever it may be.

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  • Former Community Member
    0 Former Community Member

    Lead-acid car batteries must stay >70% charged to reach their rated number of charge/discharge cycles.  For Lead-acid Leisure, or ‘deep cycle’, batteries it's >50%. Ball park; self-discharge is around 3% per month, so if we assume your load takes 3% capacity per month out of the battery, we are losing 6% per month so hit the 30% limit in 5 months for a car battery and the 50% limit in 8 months for a leisure battery.

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  • Former Community Member
    0 Former Community Member

    Lead-acid car batteries must stay >70% charged to reach their rated number of charge/discharge cycles.  For Lead-acid Leisure, or ‘deep cycle’, batteries it's >50%. Ball park; self-discharge is around 3% per month, so if we assume your load takes 3% capacity per month out of the battery, we are losing 6% per month so hit the 30% limit in 5 months for a car battery and the 50% limit in 8 months for a leisure battery.

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