Your Generator's Wattage

Wattage measures the "volume" of electricity a generator creates. Wattage requirements increase with each additional appliance or piece of equipment you need a generator to power. The smallest generators produce around 800 watts while large industrial generators can produce 500,000 watts (500 kilowatts, or kW) or more. Small businesses typically require generators that can produce 15 kW to 100 kW.

Before choosing a generator, particularly standby generators, you'll need to decide what equipment you want it to run. The "right" size electric generator provides just enough wattage to operate all your essential equipment. Common devices include refrigerators, freezers, security and access control systems, sump pumps, essential lights, electric gates or overhead doors, ejector pumps, well pumps, and septic systems. Keep in mind that every electronic device you add to the list will increase the wattage you need. While a single light bulb will only add 70 watts, a mid-sized central air conditioner can draw 4000 watts or more.

Limit your choices to those devices that are truly essential during a power outage and you'll keep your total costs down. Too few watts and you can overwork the electric generator, potentially damaging it and anything plugged into it. Too many watts and you'll waste money on the initial generator purchase and on fuel. Accurately determining the watts your equipment requires will help you get a generator that can meet your electrical demands without spending too much.

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