Motor Replacement Savings Comparator — Compare the Old Motor With Its Replacement
Compare the old and replacement motor on the same useful load and operating schedule. See annual electricity savings, operating-cost difference, replacement premium and simple payback.
Project assumptions
Existing motor
Replacement motor
Why this comparison is different from a simple payback calculation
The replacement decision can include more than electricity. This comparator shows annual energy cost and maintenance together, then subtracts the replacement investment to determine the simple payback.
Same useful output
The model keeps useful motor output constant so the efficiency comparison does not accidentally reward a larger or smaller useful workload.
Maintenance matters
A replacement with lower electricity use can also have a different annual maintenance assumption. Enter both values to see the combined operating-cost effect.
Worked example
At 22 kW useful output and 75% average loading, the modeled useful output is 16.5 kW. Raising efficiency from 89% to 94% lowers electrical input and creates annual energy savings when the motor is heavily used.
Limitations
Actual project economics may include downtime, financing, residual value, tax treatment, demand charges and changing electricity prices.
Frequently asked questions
Does the calculator assume both motors deliver the same output?
Yes. The useful output entered is held constant.
Does it include maintenance savings?
Yes. The annual maintenance difference is included.
Does payback include financing?
No. It is simple payback from the entered replacement cost and annual operating savings.