VSD Compressor Savings Calculator

Energy savings from variable speed drive vs load/unload.

Compressor HP

Average load (%)

Electricity rate ($/kWh)

Operating hours/year

Motor efficiency (%)

Tab to move between fields

Annual energy savings ($)

$2,554.24

Savings (%)10

Load/unload annual cost ($)$25,542.39

VSD annual cost ($)$22,988.15

Annual kWh savings25,542

Simple payback (years)3.7

CO₂ reduction (lbs/yr)21,839

How to Use This Calculator

Enter the current fixed-speed compressor horsepower and motor efficiency.
Set the average load factor (percentage of full-load operation).
Input your electricity rate and annual operating hours.
Enter the VSD compressor cost and expected savings percentage from variable-speed operation.
Review annual energy savings, simple payback, and 5-year NPV to justify the capital investment.

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