Start by listing all the appliances that you will need to simultaneously power. Once you have this list, write down each of their running and starting watts. The total running watts you’ll need are equal to the sum of all individual running wattages. The total starting watts you’ll need are equal to the total running watts + the highest single starting wattage. Lastly, multiply the running wattage by 1.2 to avoid running your unit at full load. All of this can be done easily with our generator sizing tool.