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
Converting kVA to kW
Converting kW to kVA
Converting kW to HP
What size genset is needed to start a 3 phase electric motor Direct on Line (DOL) start
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.
* 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.
Recommended generators
Fill out the Generator Size to Start Motors calculator above to see Generator recommendations
Sorry! No Generator sizes found matching your recommendation.
201kVA - 400kVA 3-phase 415V
36kVA - 200kVA 3-phase 415V
65kVA Pramac Perkins Generator (GSW65P-PFL)
- Regular price
- $23,749.00
- Sale price
- $23,749.00
- Regular price
-
Over 400kVA 3-phase 415V
Up to 35kVA 3-phase 415V
21.5kVA Pramac Perkins Generator (GSW22P-PFL)
- Regular price
- $17,149.00
- Sale price
- $17,149.00
- Regular price
-
Up to 50kVA Single Phase
3.5kVA Maxwatt Petrol Generator Recoil Start (MX3000R)
- Regular price
- $739.00
- Sale price
- $739.00
- Regular price
-
$749.00
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 |
Please Note:
Inductive loads (typically electric motors, electric pumps, electric compressors and air conditioners) require 6-8 times more current to start than to run. Most generators can provide 100% overload for start up purposes. A 1 Hp electric motor therefore will require 3-4kVA for start up. Once the 1 Hp electric motor has started, it will only consume 1 kVA leaving a extra 2-3kVA available for other appliances.
However, the newer 'Inverter' style generators may be more efficient and capable of starting higher loads.
Generator Selection
The generator size must be equal or greater than the total consumption of all applications. The higher starting requirement must be taken into account accordingly. To maximise the generator potential, the largest electrical motor should be started on its own and further appliances should only be switched on thereafter.
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