TECHNICAL CALCULATOR
Generator Sizing Calculator
Estimate standby generator capacity based on connected load, power factor, motor starting allowance, diversity and future expansion.
Standby Power Estimator
Calculate Recommended Generator Capacity
Technical Notes
Generator Sizing Considerations
Generator loading should avoid long-term underloading
Altitude and temperature can derate generator capacity
UPS and inverter loads may affect generator performance
Final sizing should be based on site-specific load assessment
Worked Example
Typical Generator Sizing Example
Example Inputs
- Connected Load
- 100kW
- Diversity
- 80%
- Motor Starting Allowance
- 25%
- Future Expansion
- 20%
- Target Loading
- 80%
Calculated Result
- Diversified load
- 80kW
- Motor allowance
- 20kW
- Expansion allowance
- 16kW
- Required load
- 116kW
- Recommended generator
- 145kW
Suggested generator size: approximately 200kVA depending on power factor and manufacturer rating.
GENERATOR DESIGN SUPPORT
Need Accurate Generator Sizing?
Emerald can assess your essential loads, motor starting requirements, site conditions and standby power requirements to design the correct generator solution.