Troubleshooting Low Pump Discharge: Tips to Boost Speed and Output

In summary, There is a 12v DC pump connected to a 12v auxiliary battery that charges with a 12v, 35 amp truck alternator. The pump is 1/4 hp and has a maximum draw of 20 amps, but the discharge output is only 8-10lpm, despite being designed for up to 57lpm. The likely reason for this low discharge is excessive voltage drop in the wire, caused by using too thin and/or too long wires. It is recommended to use a wire gauge that can handle a 3% voltage drop for 20 amps and the required length.
  • #1
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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  • #2
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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What causes low discharge from a pump?

There are several possible causes for low discharge from a pump. It could be due to a clogged or damaged discharge pipe, a malfunctioning impeller, or low power supply to the pump. It could also be caused by insufficient water supply to the pump, or air in the system.

How can I fix low discharge from my pump?

The solution to low discharge from a pump depends on the root cause. If the discharge pipe is clogged or damaged, it will need to be replaced or cleaned. If the impeller is malfunctioning, it may need to be repaired or replaced. In the case of low power supply, check the electrical connections and ensure the pump is receiving enough power. If there is insufficient water supply, you may need to adjust the water source or install a larger pump. Lastly, if there is air in the system, it will need to be flushed out.

Can low discharge from a pump be prevented?

In most cases, low discharge from a pump can be prevented by regularly maintaining and inspecting the pump and its components. This includes cleaning or replacing the discharge pipe, checking and repairing the impeller, and ensuring the pump is receiving sufficient power. It is also important to have a reliable water supply and to properly prime the pump before use.

What are the potential consequences of low discharge from a pump?

If left untreated, low discharge from a pump can lead to decreased efficiency and performance of the pump. It can also cause damage to the pump and its components, resulting in costly repairs or replacements. In some cases, it may also affect the overall functioning of the system the pump is a part of.

When should I seek professional help for low discharge from a pump?

If you have tried troubleshooting the issue and the low discharge from your pump persists, it may be necessary to seek professional help. Additionally, if you are unsure of the cause of the low discharge or do not have experience with pump maintenance and repair, it is best to consult a professional to avoid causing further damage to the pump or system.

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