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To avoid this complicated equation, you can use an online load calculator. If the electrical load is more than your current electrical service, you need to increase it to the next service level. Divide the resulting number of watts by volts (most homes use 220 volts) to get the number of amps, or the electrical load.Since you only use one at a time, add only the larger wattage rating to your equation. Compare the wattage of your air conditioner and furnace.Subtract 10,000 watts from the sum of all these, and multiply the result by 0.4 (40%).Add together the wattage rating of all of your permanent appliances (washer/dryer, dishwasher, water heater, etc.).Add the wattage capacity of all general lighting circuits and the wattage rating of all of your plug-in outlet circuits.

You can calculate how many amps your home needs using the following steps: Calculating Electrical Loadįigure out if you need to change your electrical service by comparing it to the electrical load. For example, if you get a new HVAC system that doesn’t use as much electricity, your electrical load and your energy bill will be lower. Finding the electrical load is an important part of determining whether you need to change your electrical service, as it will tell you if the power supplied to your home (amps) isn’t enough for your electricity use.Ĭhanging the electrical load of your house also indicates a change in your energy bill. The electrical load of a house determines many things, including the amperage of your electrical panel. Why is electrical load calculation important? When making significant electrical additions to a home, everything that will use electricity to run is calculated to find the electrical load. The electrical load is the calculation of how much power is required to run everything that consumes electricity in your home. Let’s break down everything you need to know about calculating an electrical load. However, you’ll need to calculate it if you’re making any big electrical changes. That means the concept of electrical loads might be confusing. If you’re like most people, you’re not an electrician.