Running Watts vs Starting Watts

Every motor driven appliance draws more power when it first starts up than when it runs continuously. A fridge compressor might run at 150W but spike to 600W on startup. An air compressor rated at 1,500W can draw 4,500W for the first few seconds. The calculator factors in these starting loads automatically, so the generator it recommends will handle both the startup spike and the continuous running load without tripping the overload protection.

Inverter vs Conventional Generators

Inverter generators produce clean, stable power (pure sine wave) that's safe for laptops, phones, medical equipment, and sensitive electronics. Conventional generators deliver reliable, cost effective power for tools, pumps, and lighting. If you're powering a mix of both, an inverter generator is the safer choice. The calculator recommends both types where appropriate based on your use case.

Common NZ Power Requirements

Typical home backup during a power outage (fridge, lights, WiFi router, phone chargers): approximately 2,000W running. Small workshop (angle grinder, drop saw, lights): approximately 3,000 to 5,000W. Dairy shed or large workshop with a welder: 8,000 to 15,000W or more. If you're not sure where your setup falls, the calculator will work it out for you.

Need Help Choosing?

Our team has 40 years of combined experience in generator applications including mains failure, remote start, solar backup, and custom built setups. If the calculator gives you a result and you're still not sure which generator is the right fit, call us on 0800 GENERATOR or submit a Quick Enquiry on any product page and we'll recommend the best option for your situation.