Frequently Asked Questions
What is the difference between running watts and starting watts?
Running watts (also called continuous watts) is the power an appliance needs to run steadily. Starting watts (surge watts) is the higher power needed for a fraction of a second when a motor-driven appliance starts. A sump pump may need 800 running watts but 2,000 starting watts. A generator must be sized to handle the starting surge of the largest motor in your load list.
How do I calculate total generator watts needed?
Add the running watts of all appliances you want to power simultaneously. Then add the starting surge of the single largest motor (not all of them, since only one starts at a time). Add a 20% safety margin. Round up to the next standard generator size. For example: 2,000W running loads + 2,000W AC surge = 4,000W required; round up to a 5,000W generator.
Should I choose a portable or standby generator?
Portable generators (1,000-12,000W) cost $500-3,000, run on gasoline or propane, must be set up and fueled manually, and run for 8-12 hours per tank. Standby generators ($5,000-15,000 installed) connect to natural gas or propane, start automatically within seconds of a power outage, and can run for days. Standby makes sense for frequent outages or medical equipment dependence.
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This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.