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What size home generator do I need?

GenSpring Power • Jun 17, 2015

Understanding how you use energy is the key to planning for a home generator system for your home. The table below shows the typical wattage associated with various home appliances and will help you understand the factors that affect generator size. There are two primary considerations – Running Watts and Starting Watts.  Running watts represent the steady-state wattage, while Starting Watts represent the initial starting wattage required when the appliance first starts. The table below is presented as a guide for you.  When we meet with you for your site visit, we will use our years of experience to ensure that you have the right generator system to meet your needs.

Wattage Reference Guide

Appliance Running Watts Starting Watts
AC 3 Ton 2880 8640
AC 4 Ton 4560 13680
AC 5 Ton 6240 18720
Electric Dryer 5000 6400
Gas Dryer 700 2100
Clothes Washer 1200 2400
Coffee Maker 1000
Electric Range (per element) 1200
Electric Oven 4000
Microwave Oven 1000
Freezer 700
Refridgerator 700
Electric Water Heater 4500
Gas Furance Fan 700
Electric HP Strip Heat (8,000 to 15,000) 10000
Garage Door Opener 500
Hair Dryer 1200
Sump Pump 800 1000
Well Pump 2400 3200
Entertainment (500 watts per device) 500
General Purpose Lighting (per bulb) 100

Clayton Preble

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