Power Generators

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Appliance in Watts Approximate power consumption
Radio 200
Toaster 1250
Hair Dryer (1800 watt) 2000
Iron (steam) 1800
Lights (incandescent 5 x 60 watt) 300
Fridge 400
Freezer 400
TV 350
Microwave (650 watt) 950
Microwave (850 watt) 1500
Air conditioner 1 hp
Heat/Cool output 2.5kW		 2200
Air conditioner 1.25 hp
Heat/Cool output 3.0kW 		2800
Air conditioner 1.5 hp
Heat/Cool output 3.5kW 		3000
Air conditioner 2 hp
Heat/Cool output 4.5kW		 4800

Some useful formulas

Applicable for single phase only (i.e. 240 volts)
To calculate kW V x | x pf
1000
To calculate kVA V x |
1000
To calculate Amps
When kW known 		kW x 1000
V x pf
To calculate Amps
WhenkVA known 		kVA x 1000
V

Formula legend
V = voltage
| = current in amps
kW = power in kilowatts
kVA = kilovolt amps
pf = power factor

Differences between Open Frame and Sine Wave (Inverter) Portable Generators

Conventional Skid Frame (inverter) Style Yamaha EF3000iSE Inverter Generator
Conventional Skid Frame Style Sine Wave
Lower cost per kW More expensive due to electronics
Rugged construction for job sites Sturdy but requires moderate cares
Heavier 40% lighter due to smaller engine without flywheel
Loud 10 -15 decibels quieter due to sound attenuating panels and lower engine noise
Larger per kW Compact design
Constant 3600 rpm engine speed Variable engine speed governed by load requirements - quieter through normal load ranges and better fuel economy
Conventional alternator produced Electricity with distortion Inverter clean stable output with pure sine wave – can run any electronic equipment
3-5% fluctuation in voltage and frequency Typically less than 2%
Engine cannot perform above maximum load rating Operates at 120% of rated output for 20 seconds to allow motors and air conditioners to start
Thermal breaker overload protection Microprocessor control instantly senses high overload condition and shuts down unit
Centrifugal governor Digital control provides superior engine management

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