Step 1: Understand Starting vs. Running Watts

Every appliance has two power ratings: starting (surge) watts and running watts. Starting watts are the extra power needed to get motors going, while running watts are what’s required to keep them operating. Check your devices’ labels or manuals to record both numbers, then sum them up. You can also reference a watt meter to measure real usage.

Step 2: Create a Load Worksheet

List all the devices you plan to run simultaneously—think refrigerators, lights, sump pumps, and electronics. Add the running watts together, then add the highest single starting wattage to get your total requirement. If you’re unsure, many portable generator calculators can simplify the process.

Step 3: Factor in Future Needs

If you might add more appliances later, choose a generator with at least 20% extra capacity. This ensures you won’t overload your unit and gives flexibility for unexpected needs.

Step 4: Match Your Total to the Right Generator

Small generators under 3,000 watts are ideal for camping or light power needs, while 5,000–7,500 watts cover most home essentials. Whole-home backup systems often require 10,000 watts or more. Explore a range of portable generators and standby generators to find a match.

Step 5: Safety and Efficiency Tips

Never exceed your generator’s rated capacity—this can damage electronics and shorten engine life. Use a transfer switch for safe home connections, and position your generator in a well-ventilated outdoor space to prevent carbon monoxide buildup.