To determine whole-house generator sizing, the first step is for the homeowner to determine the number of appliances and electrical devices that will be run and calculate the total wattage.

Not all generators are equal so when deciding what size generator, list out what you'll need to supply power to and calculate the amount of wattage needed ...

Adding up the running watts and the highest starting wattage of all the devices you wish to power with a generator will help you determine the size of the generator you will need.

One of the biggest questions that come up time and again is how to determine what size generator for RV power usage. See what size generator is right for you.

To determine generator size, the easiest way is to add up the wattages of everything in your home you want to power with a generator.

The amount of power a generator delivers will determine how many electronics and appliances you'll be able to run at once.

Your generator also must have at least a 30-amp/240-volt output. To calculate wattage for a standby generator, check a year's worth of electric bills to find the highest kilowatt usage.