This website is under construction, please contact us to confirm all information provided.

We are your

Power Generator Specialists

Calculator

Generator Power Calculator

These calculators will assit you in determining what size generator you may require or how to convert one unit of electricity to another.

Open this page in a seperate window.

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: You only need to fill in the columns coloured in blue.
Fill in the HP of the motor(s) in their starting squence, select the start method (Direct On Line or Star Delta) and press Evaluate. The required generator size will then be displayed at the bottom.

3 Phase (415 volt @ 50Hz)
1 Phase (240 volt @ 50Hz)

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:	kVA*
Generator Size for Running with:	kVA*
Generator Size Recommended:	kVA*

* 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 Caluculator

Appliance	Rated Watts	Rated kVA	Rated kVA
	(appliances)	(generator to operate appliance)	(generator 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. A 1 kVA electric motor therefore will require 6-8kVA for start up. Power King generators can provide 100 overload for start up purposes. A 1 kVA electric motor therefore can be started with a 3-4kVA generator. Once the 1 kVA electric motor has started, it will only consume 1 kVA and further 2-3kVA are then available for other appliances.

Generator Selection

The generator size must be equal or greater than the total consumption of all applications. The higher starting requirement must he 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.