Power Calculator

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. 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 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.