Energy Saving Calculator.

Enter the pump motor and operating information below to obtain a preliminary estimate of annual electricity and cost savings for a centrifugal pump controlled by a variable frequency drive.

Pump system information

Results update automatically as the values change.

Pump motor power

Use the rated motor power shown on the nameplate.

Operating hours per day

hours

Operating days per year

days

Rated system frequency

Local electricity price

/ kWh

Estimated average operating frequency 37.5 Hz

Use the expected average running frequency. For example, 37.5 Hz on a 50 Hz system equals 75% average speed.

Pump system head condition

A general planning adjustment is applied. Select a known system condition for a more suitable preliminary estimate.

Estimated annual savings

A preliminary planning range, not a guaranteed performance result.

Estimated electricity cost saved per year — Planning value: —

Estimated saving-rate range — Planning value: —

Energy saved per year — Planning value: —

Fixed-speed annual consumption — Rated power × annual operating hours

Estimated VFD annual consumption — Based on the planning midpoint

Annual energy comparison

Fixed-speed operation —

Estimated VFD operation —

Calculation basis: the calculator uses the centrifugal-pump affinity relationship between speed and power, then applies a preliminary planning adjustment for the selected system-head condition. Static head, pump curves, pressure requirements, pump efficiency, minimum speed and control strategy can materially change the actual result.

For a more reliable recommendation, send us the pump nameplate, operating frequency, pressure requirement and application details.

Request a Pump VFD Recommendation

Preliminary estimate for centrifugal pump applications only. Actual savings must be verified using pump-system data and electricity-meter records before and after installation.

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