Home/Calculators/VFD Energy Savings Calculator
CALCULATOR Free · indicativeWhat could a VFD save on your fan or pump?
Compare today’s throttled or bypass control with variable-speed control. See the kWh, rupees and CO₂ saved and how soon the drive pays for itself.
You’ll get
- Energy and rupee savings
- Payback in months
- CO₂ avoided
Your inputs
Advanced assumptions
Result
-kWh / yr
Average power today-
Average power with VFD-
Saving per year-
VFD cost (indicative)-
Payback-
CO₂ avoided / yr-
Average electrical power
Indicative estimate only. Real results depend on your equipment, site conditions and applicable standards. This is not a design or an offer.
Want this checked by an engineer?
Send us your result and we’ll review it and prepare a recommendation and quotation.
Chat on WhatsApp insteadHow we calculate
Method & assumptions
- Today (throttle)Power ≈ rated × (0.55 + 0.45 × flow) - a typical throttled-system curve.
- Today (bypass)Power stays near full load regardless of flow.
- With VFDPower ≈ rated × flow × (static + (1 − static) × flow²), plus 3% drive losses.
- SavingsPower difference × hours × tariff; payback on the drive cost entered.
- ImportantReal savings depend on the load profile, system curve and drive; a site study gives a firm figure.
FAQ
About this calculator
Which loads save the most?
Centrifugal pumps and fans that run at partial flow - savings fall quickly as speed approaches 100%.
Does it help constant-load machines?
Not much for energy; a VFD may still help with soft starting and process control.
Will a VFD reduce motor life?
Use inverter-duty motors or output filters where needed. We specify the combination.
Do you supply drives and panels?
Yes - VFD and soft-starter panels are in our catalogue.
Related products