Generator Sizing Basics for Site and Backup Power

A generator should be selected around the equipment it needs to run, not only the headline power rating. Starting loads, continuous loads, and safety margin all affect the correct generator size.

Key Points

• List every appliance, tool, or machine that may run at the same time.
• Allow for higher starting load from motors, pumps, compressors, and refrigeration equipment.
• Choose a generator with enough continuous output, not just peak output.
• Consider noise level, fuel capacity, mobility, and service access.

If the load is uncertain, it is safer to confirm the required wattage before purchase or rental rather than relying on a rough estimate.