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Determine how much wattage you need to run your house when the power goes out. The more wattage it produces, the more items your generator can run.
The first step to deciding on what generator to buy is determining what items in your home you want to have power when your electricity goes out. After deciding what you want to run the next step is to determine the running watts and starting watts for each item in your list. Running watts are the amount of watts the item is rated to use. Starting watts or surge watts is the amount of watts the item uses immediately when it is turned on. Use the sample Wattage Calculator below to determine your generator needs. For an example of the wattage needs of essential items in your home consult the example below. This example should not be followed strictly in each case as your items wattage needs may vary from those in the example.
EXAMPLE:
ESSENTIAL ITEMS RUNNING WATTS STARTING WATTS
Light Bulb - 60 Watt 60 0 Refrigerator / Freezer 700 2200 Sump Pump 1/3 HP 800 1300 Electric Water Heater 4000 0 Central AC - 24,000 BTU 3800 4950 Electric Stove - 8" Element 2100 0 Dishwasher - Hot Dry 1500 1500 Washing Machine 1150 2250 Clothes Dryer - Electric 5400 1350
WATTAGE CALCULATOR:
APPLIANCE RUN WATTS ADDITIONAL START WATTS 1. 2. 3. 4. 5. 6. 7. TOTAL RUNNING WATTS = HIGHEST ADDITIONAL STARTING WATTS = TOTAL RUNNING WATTS = TOTAL STARTING WATTS =
Add the running watts of the items you wish to power at one time. Enter this number in TOTAL RUNNING WATTS. Select the one individual item with the highest number of additional starting watts. Take this number, add it to your TOTAL RUNNING WATTS, and enter that total in TOTAL STARTING WATTS.
Once you have finished determining your wattage needs, use the TOTAL RUNNING WATTS and TOTAL STARTING WATTS to decide which generator to buy. Look for a generator with at least 25% more TOTAL RUNNING WATTS and TOTAL STARTING WATTS so that the generator will not need to run at full power all the time. This way your generator will run more efficiently and you will have room for some changes in your power needs in an emergency.
Consult your appliances, items or their manuals for help in determining the running watts and starting watts for each individual item on your list. If you are unsure how to do this or need help consult a local professional that specializes in installing generators.
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