Estimate required power (Watts) and daily energy (kWh)
Freezing vs. Maintenance: A fridge/freezer uses its nominal power only 20-30% of the time during maintenance. However, during "Deep Freeze" or after adding warm food, it runs 100% of the time.
Startup Surge: Motor-driven devices (pumps, compressors) need 3-7x their rated power for a few seconds to start. This is critical for generator sizing!