Last Post 24 Aug 2014 01:38 PM by  Tim Leibel
Need help with battery selection
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Randy Hunt
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21 Aug 2014 01:08 PM

    Hello:

    I am building a sluice that will be fed with a Johnson 2200 GPH 12 V pump; it draws 7.5 amps.  Does anyone know reasonably priced deep cycle (or regular) battery that will run this pump for 6 hours or so.  Realistically, I will run the slice 6-8 times a year.  So, I don't know if I really need a deep cycle battery for this number of recharges per year.  Maybe I do??  Thanks ahead.

    Randy
    Tim Leibel
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    21 Aug 2014 07:59 PM
    I use a Sealed lead cell battery for my recirc sluice. It is a 12V 10Mah that I got for about $26 I know the local equivalent to a batteries plus has some with up to 15 Mah for under $40. You might try that. They are a lot lighter than a big deep cycle battery
    Randy Hunt
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    23 Aug 2014 06:53 PM

    I found some information on this issue that might be useful to others.

    First calculate the pump draw in Watts = battery voltage x pump amperage

    Pump run time = Battery voltage x battery amp hours / Pump draw in Watts

    So, for the Johnson 2200GPH pump run by a 50 amp hour 12V battery:

    12V x 7.5 amps (pump draws 7.5 amps) = 90W

    Run Time = 12 x 50 (for a 50 amp hour battery) / 90 = 6.67 hours

    Note this is total run time.  It will not pump at full rating for this long, maybe half.
    Tim Leibel
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    24 Aug 2014 01:38 PM
    Its nice to know the math on it.
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