Enter the motor, its efficiency class, the control method and the flow profile to compare a motor replacement, a drive or both, with energy use, savings and payback.
Pre-sizing and estimating tool: results do not replace design, calculations or reports signed by a licensed professional, nor verification against the applicable codes and standards.
Comparison of the current setup, new motor only, drive only and both together.
How much each option spends per year and how much it saves versus the current setup.
Estimated curves for the current and new motor; points show where each operates.
Cash flow of the improvement: investment in year 0 and annual savings escalated at the rate entered, discounted at the MARR.
The report gathers this page's inputs, results, equations, assumptions and references, with fields for project, engineer and revision. In the print dialog, choose Save as PDF.
It depends on running hours and efficiency gap. Motors with long annual hours, old or rewound several times often pay back in 2 to 4 years. With few hours, replacing on failure usually makes more sense.
On pumps and fans with variable flow and little static head, power falls roughly with the cube of flow. Running at 80% flow needs about half the power. With this page’s default profile, savings exceed 30%.
No. Under 10 CFR 431, most general-purpose motors from 1 to 500 hp sold in the US must meet NEMA Premium (IE3) efficiency since June 2016.
Important notice: Indus Metrics tools produce estimates and pre-sizing results from the data you enter and from published engineering methods. They do not replace design, calculations or reports signed by a licensed professional engineer (PE), nor verification against the applicable codes, standards and regulations, such as OSHA rules and the ASME codes. Material and fuel properties vary: check manufacturer data or your own process analyses before deciding. By using this site you agree to the Terms of Use.
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