Suggested Standard UPS Size
80 kVA
Insufficient
100 kVA
Recommended
120 kVA
Consider where future load growth is expected.
Typical UPS brands Emerald works with include Delta, Eaton, APC, Riello and Huawei.
TECHNICAL CALCULATOR
kVA / kW / Amps Calculator
Convert between kVA, kW and amps for single-phase and three-phase AC systems using voltage and power factor.
AC Power Converter
Convert kVA, kW And Amps
Technical Recommendations
Typical equipment recommendations based on your calculated load.
- kVA
- 100,0 kVA
- kW
- 80,0 kW
- Amps
- 144,3 A
- Voltage
- 400V
- Phase
- Three Phase
- Power Factor
- 0,80
Typical Generator Starting Point
Generator design basis: 125,0 kVA
100 kVA
Likely undersized
125 kVA
Typical starting point
150 kVA
Consider for motor starting or future expansion
Typical generator engine and alternator brands include Perkins, Scania, Cummins, Volvo Penta, Caterpillar, Baudouin and Mecc Alte.
Generator selection must consider motor starting currents, UPS rectifier behaviour, nonlinear loads, battery charging, load step changes, altitude and ambient temperature.
Indicative Supply Breaker
125 A
Too small
160 A
Indicative next standard size
Supply breaker selection must be coordinated with cable size, equipment requirements, fault level, discrimination, installation method and applicable standards.
These recommendations are based on standard commercial equipment ratings and should be confirmed during the technical design process.
UPS Systems
Avoid loading a UPS continuously near full capacity where future growth is expected. Allow spare capacity for load growth, battery charging and redundancy where applicable.
Generator Systems
Generator sizing must be verified against motor starting, nonlinear loads, UPS input behaviour, harmonics, altitude, ambient temperature and load step requirements.
Electrical Distribution
Breaker and cable sizes must be coordinated. Final design must confirm cable rating, voltage drop, fault level, discrimination and installation conditions.
This calculator provides a technical estimate only. Final equipment selection and electrical design must be confirmed by a qualified electrician or engineer in accordance with load characteristics, site conditions, manufacturer requirements and applicable standards.
Technical Assessment
Need a detailed design or quotation?
Send your calculated load information to Emerald and our team can assist with UPS, generator, cable, breaker and battery sizing.
Technical Notes
Power Conversion Considerations
Three-phase calculations use the square-root-three relationship between line voltage and phase current.
Power factor is required when converting between real power in kW and apparent power in kVA.
Voltage and current values should reflect the actual supply configuration and connected load.
Final breaker, cable and protection selections must be confirmed through proper electrical design.
ELECTRICAL DESIGN SUPPORT
Need Help Confirming Electrical Loads?
Emerald can assess your power requirements, supply configuration, breaker sizing, cable routes and critical infrastructure loads.