MobCater Generator Sizing

Identify Your Power Needs

Calculate Total Watts

Find the Perfect Generator

When selecting a generator there are several important features to consider:
Wattage / Engine / Run Time / Starting / Mobility

The size of the generator you need depends on your power requirements. Generally a higher wattage generator lets you power more items at once. This generator sizing sheet will help you to determine your running and starting watts so you can choose the correct generator for your needs.

Find all of the appliances you want to power with your Greengear LPG / Propane generator.

ApplianceRunning (Rated) WattsAdditional Starting Watts
General Appliances
Light bulb – 60 Watts600
Light bulb – 70 Watts700
Sump Pump – 1/3 HP11402850
Water well pump – 1/3HP5751440
Microwave Oven – 625 Watts6250
Microwave Oven – 1000 Watts10000
Coffee Maker10000
Electric Stove – 8in. element21000
Dishwasher – Hot Dry15001500
Food Processor4000
Toaster Oven12000
Washing Machine11502250
Clothes Dryer – Electric54006750
Clothes Dryer – Gas7001800
ApplianceRunning (Rated) WattsAdditional Starting Watts
Heating / Cooling
Space Heater18000
Humidifier – 13 Gal1750
Furnace Fan Blower – 1/2HP8002350
Furnace Fan Blower – 1/3HP7001400
Window AC – 10,000 BTU12003600
Window AC – 12,000 BTU32509750
Central AC – 10,000 BTU15004500
Central AC – 24,000 BTU380011400
Heat Pump47004500
Family / Play
Colour TV – 27 inch5000
Video Game System400
Security System5000
Hair Dryer – 1250 Watts12500
Curling Iron15000
Electric Grill16500
AM/FM Radio1000
CD/DVD Player1000
Mobile Phone Charger100
ApplianceRunning (Rated) WattsAdditional Starting Watts
DIY / Jobsite
Quartz Halogen Work Light – 300Watts3000
Quartz Halogen Work Light – 1000Watts10000
Airless Sprayer – 1/3HP6001200
Reciprocating Saw9600
Electric Drill – 3/8in. 4 Amps440600
Electric Drill – 1/2in. 5.4 Amps600900
Belt Sander12002400
Air Compressor – 1/4HP9751600
Air Compressor – 1 HP16004500
Hammer Drill16001400
Circular Saw – 7-1/4”21005250
Planer/Jointer – 6”18004500
ApplianceRunning (Rated) WattsAdditional Starting Watts
Office Equipment
Computer with 17inch Monitor8000
Laser Printer9500
Fax Machine650
Copy Machine16000

Add up all the Running Watts required to operate your appliances. Now find the item with the highest Additional Starting Watts.

Add this number to your total to find the Total Watts needed for your Greengear generator.

ApplianceRunning (Rated) WattsAdditional Starting Watts
1/2 HP Furnace Fan8002350
Lights (6x75Watts)4500

Click to download a printable PDF calculation sheet.

In this example, you will need a generator that produces at least 2450 Total Running Watts and 4800 Total Starting Watts.

Using the numbers you calculated in Step 2, find the generator that best suits your energy needs.

If you have any additional questions, please view our FAQs below.

Generator ModelRunning (Rated) WattsStarting Watts
Power Generators
GE-30002400 W2600 W
GE-5000UK5000 W5500 W
GE-6000UK6000 W6500 W
GE-7000UK7000 W7500 W

How can I determine the running or the starting Watts needed for a tool or appliance if it’s not clearly labelled?

If the running Watts are not on the data plate or in the instructions of the tool or appliance, you can make an estimate using the following equation: VOLTS (V) x AMPS (A) = WATTS (W or kW).

How many Watts does an average sized house require to run basic items?

In a typical 2 bed house, running only essentials items (a few lights, refrigerator, heating system) it can require between 5000 – 7000 Watts.

What is the difference between running Watts and starting Watts?

Running (Rated) Watts – continuous Watts needed to keep the appliance running. Starting Watts – extra Watts needed for a few seconds to start the appliance.

Why is only one additional starting Watt appliance used to calculate the total starting Watts required?

Running Watts are the amount of power required for the tool or appliance to run normally. However the starting Watts are what is needed only during the first few second or the initial start-up of the operation. In most cases, only one item will start or cycle at the same time. Therefore this is the most accurate estimate.


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