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Water Pumping Calculator

This calculator can be used to estimate the necessary PV power for a water pumping task. Given the daily volume and lift height for the pumping job, as well as information about the pump and motor, the calculator shows the power required to do the job, how much can be pumped in case the pump is not powerful enough, and the degree to which the pump’s power is utilized. The results compare a dual-axis solar tracking system to a stationary system. The calculation uses the solar energy curve through the day and a hypothetical efficiency curve for the pump.

Units:
Total Dynamic Head: How high the water is pumped, taking losses from friction into account. There is usually only a small difference between TDH and lift height. How high the water is pumped, taking losses from friction into account. There is usually only a small difference between TDH and lift height.
Volume Per Day: The desired volume to be pumped in one day. The desired volume to be pumped in one day.
Max. Pump Power: The pump's highest recommended power input. The pump's highest recommended power input.
Min. Motor Power: The minimum power needed for the pump motor to operate. This should be directly related to the maximum pump power. The minimum power needed for the pump motor to operate. This should be directly related to the maximum pump power.
Max. Pump Efficiency: The pump's efficiency at its highest performance. The pump's efficiency at its highest performance.
Motor Efficiency: The motor's efficiency at its highest performance. The motor's efficiency at its highest performance.
VFD Efficiency: The VFD's efficiency at its highest performance. The one supplied as a part of Lauritzen Inc.'s PVVFD has about 95% efficiency. The VFD's efficiency at its highest performance. The one supplied as a part of Lauritzen Inc.'s PVVFD has about 95% efficiency.
Daylight Hours: Number of hours for which the sun is up each day. Number of hours for which the sun is up each day.
Tracking Stationary
PV Power Needed: * *
Volume Pumped: * *
The average percent of full power at which the pump is working during daylight hours. Since the pump has to rev up and down, this cannot reach 100%. The average percent of full power at which the pump is working during daylight hours. Since the pump has to rev up and down, this cannot reach 100%. Pump Utilization: * *
*The pump is not powerful enough to pump the specified volume.

Disclaimer

This calculator is designed to provide an estimate and may not reflect actual results. It uses a hypothetical model to generate results, and actual results vary depending on equipment and region. Lauritzen Inc. is not responsible for the consequences of any decisions made in reliance upon the provided results.