What Size Generator for a Freezer?

Understanding the Power Requirements

Deep freezers and chest freezers are highly efficient appliances — a modern chest freezer uses only 100–200 watts while running. But the compressor startup surge (300–600 watts for most models) means you can't run one from a tiny inverter without adequate peak capacity. The good news: a freezer is one of the easiest loads to power on a generator, especially alongside a refrigerator.

Chest freezers run at 100–200 watts and surge to 300–600 watts. Upright freezers (less efficient) run at 200–400 watts with 600–1,200W surges. The difference in running watts between a chest and upright freezer of the same capacity is significant over time — chest freezers maintain temperature better when opened and lose less cold air.

Choosing the Right Generator Size

A 1,000-watt generator technically runs a chest freezer alone. Realistically, you'll want to run it alongside your refrigerator and lights — a 2,000-watt inverter generator handles a freezer, refrigerator, and essential small electronics comfortably.