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Help Sizing Home GenSet

Whether using a GenSet to charge up battery banks or power your home as a backup to grid failure, you must take the same steps used to size a renewable energy system to ensure you are sizing your generator properly.  You must never run your generator at maximum output for more then 30 minutes and in a perfect world this should only be to support start-up loads. 

This chart is only to be used as a rough guide to get started.  You must identify and calculate all electrical loads your generator will support and size properly.  Always keep future additions in mind, more is always better in this case.

Use this chart as a rough guide to establishing your power needs. Double check the actual power requirements of each appliance you wish to power via your home genset to properly size your unit or charge you battery bank.
Appliance/Tool Run Wattage
@ 120v
Start Wattage
@ 120v
Air Conditioner, Central, BTU 13,500 3,955 6,700
Air Conditioner, Central, BTU 15,000 4,395 7,400
Air Conditioner, Central, BTU 22,000 6,446 11,000
Air Conditioner, RV BTU 13,500 1,632 1,960
Air Conditioner, RV BTU 15,000 1,680 2,050
Air Conditioner, Window, 8000 BTU 1,200 2,100
Bench Grinder 700 2,000
Blanket, Electric 400 670
Blender 200 335
Bread Maker 600 2,300
Broiler 1,400 2,300
Broom, Electric 500 850
CD player & Speaker 100 168
Clothes Dryer Electric 750 1,800
Clothes Dryer Gas 650 720
Coffee Maker 550 1,000
Computer & Large Monitor 900 1,500
Computer & Monitor 720 1,200
Computer Network Equipment 100 170
Computer Printer Inkjet 350 585
Computer Printer Laser 720 1,200
Converter 600 1,000
Copy Machine 1,600 2,700
Dehumidifier 650 800
Dishwasher, Hot Dry 1,400 1,500
Dishwasher, Cool Dry 700 1,400
Freezer 700 2,200
Fry Pan, Electric 1,300 2,100
Furnace Fan, gas or fuel, 1/2 HP 875 2,400
Furnace Fan, gas or fuel, 1/3 HP 700 1,400
Furnace Fan, gas or fuel, 1/4 HP 600 1,000
Garage Door Opener, 1/3 HP 725 1,400
Garage Door Opener, 1/4 HP 550 1,100
Hair Dryer 900 1,500
Heat Pump 1,100 4,800
Hot Tub Heater 1,700 1,900
Hot Tub Pump 800 950
Iron 1,000 1,500
Lighting Flood 500 800
Lighting Fluorescent 90 125
Lighting Incandescent 100 170
Microwave Oven 625 800
Oven 3,400 5,700
Pump, Sump, 1/2 HP 1,100 2,200
Pump, Sump, 1/3 HP 800 1,300
Pump, Well, 1 HP 2,000 4,100
Pump, Well, 1/2 HP 900 2,000
Pump, Well, 2 HP 3,750 7,000
Pump, Well, 3 HP 5,000 10,000
Pump, Well, 3/4 HP 1,500 3,000
Pump, Well, 5 HP 7,500 15,000
Radio 200 350
Radio or Stereo 350 575
Range, Electric, 6-inch elements 1,500 2,500
Range, Electric, 8-inch elements 2,100 3,500
Refrigerator 700 2,200
RV Refrigerator 1,800 2,000
Saber Saw 500 1,400
Security System (Alarm Panel) 200 350
Sewing Machine 200 350
Slow Cooker 130 210
Space Heater 800 1,400
Table Saw 1,000 3,200
Television Color 300 500
Toaster 900 1,500
Toaster 4-slice 1,700 2,700
Vacuum Cleaner Heavy Duty 1,100 1,800
Vacuum Cleaner, Standard 800 1,340
VCR 200 350
Washer & Dryer 2,000 3,000
Water Heater, Electric 2,000 3,000

 

When selecting a home genset, consider the run time to cover your battery bank charge or emergency power supply, fuel availability, safety and convenience of use as well as load.  Whether installing a home generator for piece of mind during a grid failure or as a part of your off-grid system, the addition of a properly sized and installed GenSet will increase the value and marketability of your home.

Check out these great deals on home generators from eBay!