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Low discharge from pump

  1. Jun 19, 2012 #1
    I have a 12v DC (rotary vane type) pump that is connected to a 12v auxillary battery. The battery is 12vDC 70Ah and it charges itself with the truck's alternator, which is 12 volts, 35 amps. the pump is 1/4 hp, and it draws 20 amps max. The problem is, the discharge output of the pump is very low(8-10lpm), whereas the pump is designed to have a max discharge of upto 57lpm.
    What is the reason of low discharge?
    Is there any way to increase the speed of the pump so that the discharge rate is increased?
     
  2. jcsd
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