How to Size a Generator Based on Kwh

In order to get the most appropriate sized generator for your specific needs, you need to first determine how much electricity you require in a given day. There are two ways to calculate this: first, you can multiply the square footage of your building by 50 kilowatts. This is the method that is generally used in commercial applications, such as convenience stores. The second method, known as the square footage method, is more accurate but can be a little more complex.

The wattage requirements of your appliances can also be found online or from the manufacturer. However, you should also consider the surge watts that may throw off your calculations. Regardless, you should consider the number of appliances in your home and determine how much wattage each requires. Once you have calculated this, you can then use the wattage requirements calculator to determine the general size of the generator.

If you have an estimated amount of power needed, choosing a wattage generator that is 10 to 20 percent larger than your actual requirement will make the process easier. Choosing a generator that is ten to twenty percent larger than the actual need is also helpful, since it will allow you to upgrade your equipment if needed and manage de-rating. Remember that adverse conditions can affect the performance of your generator, so it is important to select the right sized unit.

Remember that the wattage of each appliance is measured in kilowatt hours. The higher the starting wattage of an appliance, the lower the total running watts. For example, a 240-volt air cleaner might require eighteen amps of power. A larger air purifier may require thirty. If the total wattage of all of your appliances exceeds half of the generator’s capacity rating, you’ll have to upgrade to a larger model.