What is kW?
kW is active power: the useful electrical power consumed by the load.
Diesel Generator Capacity Calculation & Selection
Get a preliminary capacity estimate from current or power input, then use it for early diesel generator selection in industrial and standby projects.
All Calculators
Capacity with Margin
83.1 kVA
- Calculated Capacity
- 69.3 kVA
- Active Power
- 55.4 kW
- Capacity Margin
- 20%
Important considerations
- Motor loads, pumps, compressors, elevators, and equipment with high starting current may require significantly higher final generator capacity.
- Nonlinear loads such as UPS, VFD, rectifiers, and data equipment may require harmonic and load characteristic review. This calculator does not calculate those effects yet.
Preliminary estimate only
This tool is designed for preliminary capacity estimation. Final diesel generator selection should consider load type, starting current, environmental conditions, altitude, temperature, operating pattern, and manufacturer specifications.
What is kVA?
kVA is apparent power and is commonly used to express generator electrical capacity.
What is Power Factor?
Power Factor links active power and apparent power. Lower PF means more kVA is needed for the same kW.
Why starting current matters?
Some loads draw high current at startup, so the generator must be reviewed against starting behavior, not only steady operation.
Common questions
What is the difference between calculating and selecting diesel generator capacity?
Calculation gives a preliminary kVA/kW estimate from current or power. Selection is the next step and also reviews load type, starting current, environment, and supply options.
Does this calculator replace final engineering design?
No. It is only for early technical review. Final diesel generator selection needs project conditions and manufacturer specifications.
What if the load includes motors or high starting current?
The estimated capacity may be too low. Motor loads, pumps, compressors, and similar equipment often need a higher final rating after technical review.