Generator Size Calculator Singapore
Event and commercial power planning tool
Generator Size & Power Calculator Singapore
Convert kVA, kW and amperes, or add your equipment to estimate a practical generator size. Singapore presets of 230V single-phase and 400V three-phase are included.
Equipment load calculator
Add each item that may run at the same time.
| Equipment | Qty | Running watts each | Starting multiplier | Running load | |
|---|---|---|---|---|---|
| 1.10 kW |
How peak load is estimated: the calculator uses the total running load plus the single largest additional starting surge. Motors, compressors and blowers may require a manufacturer-specific assessment.
kVA to Amps
Convert generator kVA into estimated current.
Amps to kW
Convert current draw into real power.
kW to Amps
Estimate current from real power.
kW to kVA
Convert real power into apparent power.
kVA to kW
Convert apparent power into real power.
Electrical formulas used
V × A × PF ÷ 1000√3 × V × A × PF ÷ 1000kW × 1000 ÷ (V × PF)kW × 1000 ÷ (√3 × V × PF)kW ÷ PFkVA × PFImportant sizing considerations
Generator selection can also depend on motor starting method, simultaneous starting, voltage dip tolerance, harmonic loads, cable length, ambient conditions, altitude, generator phase availability and the generator manufacturer’s continuous or standby rating.
This calculator provides general estimates only. Complex or safety-critical electrical work should be assessed by a qualified electrician or generator specialist.
Generator Size Calculator Singapore – kVA, kW & Amp Power Calculator
Choosing the correct generator size is important to ensure your event equipment, electrical appliances, lighting, sound systems and machines receive sufficient power throughout your event. An undersized generator may overload, trip frequently or fail to start equipment with high power demand, while an oversized generator may increase unnecessary rental costs.
Use our free generator size calculator to estimate your required generator capacity by converting between kVA, kW and amps. This tool helps you understand your electrical load requirements and select a suitable generator size for your setup.
How to Calculate What Size Generator You Need
Generator sizing depends on several important factors:
- Total running wattage of all equipment
- Starting or surge power requirements
- Single-phase or three-phase electrical supply
- Voltage requirements
- Power factor
- Recommended safety allowance
Equipment such as motors, pumps, compressors and inflatable blowers may require additional starting power before settling into normal running consumption. For events, it is usually recommended to include a safety buffer instead of operating a generator at maximum capacity.
kVA vs kW – What Is the Difference?
Generator capacity is commonly measured in kVA (kilovolt-amperes), while many electrical appliances show their power usage in watts (W) or kilowatts (kW).
kW represents the actual usable power consumed by equipment, while kVA represents the total apparent power supplied by the generator.
The relationship between them is:
kW = kVA × Power Factor
Many generator calculations use a power factor of 0.8 as a general reference. For example, a 100 kVA generator provides approximately 80 kW of usable power.
Single Phase vs Three Phase Generator
In Singapore, temporary power setups commonly use:
Single-phase supply:
- Usually 230V
- Suitable for smaller equipment and general electrical appliances
Three-phase supply:
- Usually 400V
- Suitable for higher power requirements, larger events, industrial equipment and multiple machines operating together
Selecting the correct supply type ensures better power distribution and safer operation.
Generator Size Guide for Events
Different events require different power capacities depending on equipment used.
Small events may require power for:
- Sound systems
- LED screens
- Lighting
- Fans
- Food machines
- Small appliances
Larger events may require power for:
- Stage productions
- Concert equipment
- Carnival equipment
- Inflatable attractions
- Multiple food stations
- Air-conditioning units
- High-power machines
Always calculate your total load before choosing a generator.
Temporary Generator Rental for Events in Singapore
Carnival Wiz provides event solutions and temporary power support for corporate events, school events, family days, carnivals, outdoor activities and large-scale celebrations. If you are unsure about your power requirements, our team can help calculate your equipment load and recommend a suitable generator size for your event setup.
After calculating your estimated power requirements, view our Electric Generator Rental Singapore service for reliable event power support.
How do I know what size generator I need?
Add together the power consumption of all equipment that will operate at the same time. Include additional allowance for equipment with motors or high starting current. A safety margin is recommended to prevent overloading.
How many kW is a 10 kVA generator?
Using a common power factor of 0.8, a 10 kVA generator provides approximately 8 kW of usable power.
How many kVA generator do I need for an event?
The required generator size depends on your total equipment load. Small events may only require a small generator, while large events with lighting, sound systems, food machines and attractions may require a larger three-phase generator.
What happens if my generator is too small?
A generator that is too small may experience voltage drops, frequent tripping, overheating or failure to operate equipment properly.
Should I choose a bigger generator than my calculated requirement?
Yes, it is usually recommended to have additional capacity instead of running a generator continuously at maximum load. This provides allowance for startup demand and unexpected additional equipment.
What is the difference between kVA and amps?
kVA measures generator capacity, while amps measure electrical current. The conversion depends on voltage and whether the supply is single-phase or three-phase.
Do inflatable bouncy castles need a generator?
Inflatable equipment requires continuous electricity to power air blowers. Outdoor locations without suitable power points may require a generator.
Can one generator power multiple machines?
Yes. Multiple machines can share one generator if the total electrical load is within the generator capacity and power distribution is properly planned.
What generator size do I need for carnival equipment?
It depends on the number of attractions, inflatable blowers, arcade machines, food stations and lighting requirements. Calculate the total wattage before selecting a generator.
Do you provide generator rental in Singapore?
Carnival Wiz provides event equipment solutions and can assist with temporary power requirements for suitable event setups.
