Generator Power Calculator

Generator Power Calculator

If you require assistance with this Power Calculator or what generator will best suit your requirements, please don't hesitate to contact us.

Guide to units:

 HP = Horsepower 

 kW = Kilo Watts 

 kVA = Kilo Volt Amps 

 I = Ampere or Current 

 V = Volts 

 PF = Power Factor 

Calculating Ampere (I), given kVA
Phase
1, 2, 3
Generator
kVA
Volts
Required
= Ampere
I
Converting kVA to kW
kVA = kW
Converting kW to kVA
kW = kVA
Converting kW to HP
kW = HP

What size genset is needed to start a 3 phase electric motor Direct on

Line (DOL) start
HP of
Motor
= Generator
kVA Required

Generator Size to Start Motors

Instructions: Fill in the HP of the motor(s) in their starting sequence, select the start method (DOL - Direct On Line or Star Delta) and press Calculate. The required generator size will then be displayed at the bottom.

Starting Sequence Motor HP Start Method DOL / StarDelta Run Variable Phase Current Starting Value Total Run Current Total Start Current
1 /
2 /
3 /
4 /
5 /
6 /
Generator Size for Starting with:
Generator Size for Running with:
Generator Size Recommended:

* Please NOTE the above calculations are an estimate only because other factors such as site conditions, motor efficiencies and iron losses are not taken into consideration.

Power Consumption Calculator

Appliance Rated Watts Rated kVA Rated kVA
  (Appliances) (To operate appliance) ( To start appliance)
Air Conditioner (Evaporative model) 275-1000 0.34-1.25 1.36-5
Air Conditioner (Reverse cycle) 200-2500 0.25-3.13 1-12.5
Clothes Dryer 2400 3 3
Coffee Percolator 550 0.69 0.69
Can Opener 100 0.13 0.52
Deep Freezer 500 0.63 2.52
Disposal Unit 650 0.81 3.24
Dishwasher 1000-3000 1.25-3.75 1.25-3.75
Domestic Water Pumps 275-1000 0.34-1.25 1.36-5
Exhaust Fan 40 0.05 0.2
Food Processor 500 0.63 2.52
Floor Polisher 350 0.44 1.76
Frypan 1400 1.75 1.75
Hair Dryer 1500 1.88 1.88
Hotwater Service 2500-3000 3.13-3.75 3-13-3.75
Iron 800-1500 1-1.88 1-1.88
Kettle or jug 1600-3000 2-3.75 2-3.75
Lights 25-200 0.03-0.25 0.03-0.25
Microwave 1500 1.88 1.88
Oven 4000-8000 5-10 5-10
Radio 60 0.08 0.08
Radiator 1000-2500 1.25-3.13 115-3.13
Refrigerator (home) 300 0.38 1.52
Sewing Machine 60 0.08 0.32
Space Heater 2000 2-5 2.5
Television 75-200 0.09-0.25 0.09-0.25
Toaster 250-1250 0.3-1.56 0.3-1.56
Washing Machine 500-3000 0.63-3.75 2.52-15
Welder 140A 5000 6.25 8 min