Troubleshooting Low Pump Discharge: Tips to Boost Speed and Output

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SUMMARY

The discussion focuses on troubleshooting low discharge rates in a 12v DC rotary vane pump, which is experiencing a discharge output of only 8-10 liters per minute, significantly below its maximum capacity of 57 liters per minute. The primary cause identified is excessive voltage drop due to the use of too thin and excessively long wires. To resolve this issue, it is essential to refer to a wire sizing table to ensure that the wire gauge is adequate to maintain a voltage drop of no more than 3% at 20 amps.

PREREQUISITES
  • Understanding of 12v DC pump specifications
  • Knowledge of wire gauge sizing and voltage drop calculations
  • Familiarity with electrical systems in automotive applications
  • Experience with troubleshooting electrical performance issues
NEXT STEPS
  • Research wire gauge sizing tables for 12v DC applications
  • Learn about voltage drop calculations in electrical wiring
  • Investigate alternative pump types for higher discharge rates
  • Explore methods to improve battery performance and charging efficiency
USEFUL FOR

This discussion is beneficial for automotive technicians, electrical engineers, and DIY enthusiasts working with 12v DC pumps and seeking to optimize pump performance and discharge rates.

prasan_y2k
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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?
 
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Most likely, the low performance is because of excessive voltage drop in the wire. Too thin wires, combined with too long wires. Here is a table you can use to size wire so that the voltage drop is never more than 3%. Look up 20 amps, your required length, and the table gives the required wire gauge.

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