The size of the generator you need depends on what you want to power.
Here’s a simple guide to help you determine the right size:
List Your Needs:
Make a list of all the appliances and devices you want to power during an outage.
Common items include refrigerators, air conditioners, heaters, lights, and electronics.
Calculate Wattage:
- Starting Wattage: Some appliances, like refrigerators and air conditioners, require more power to start than to run. Check the manufacturer’s label for both running and starting wattage.
- Running Wattage: This is the continuous power required to keep the appliance running.
Add Up the Wattage:
Sum the running wattages of all the appliances you plan to use simultaneously.
For starting wattages, you’ll need to account for the highest starting wattage of any one appliance, as only one high-wattage appliance might start at the same time.
Factor in Additional Margin:
It’s a good idea to add a 20-25% margin to account for any additional power needs or unforeseen requirements.
Example Calculation:
- Refrigerator: 800 watts running, 1,200 watts starting
- Heater: 1,500 watts running
- Lights and other small devices: 400 watts running
Total running watts = 800 + 1,500 + 400 = 2,700 watts
Since the refrigerator’s starting wattage is higher, you need to accommodate that as well. Adding a 25% margin:
2,700 watts x 1.25 = 3,375 watts
So, a generator with at least a 3,500-watt capacity would be suitable for this example. Here is What size generator to run a house.
Types of Generators:
- Portable Generators: Good for temporary use and usually offer 2,000 to 8,000 watts.
- Standby Generators: These are permanently installed and can offer 5,000 to 50,000 watts or more.
Ensure the generator you choose has enough power to handle your needs and consider any future power requirements.
If you’re uncertain, consulting with a professional or using an online generator sizing calculator can provide more personalized recommendations.