Off-Grid Size Calculator

To use this calculator, simply fill out the appliances you wish to run, and click the “Calculate” button at the bottom. Use the advanced options to get more precise.

Advanced options
 

 
Power Usage:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Appliance Watts Appliance Watts Appliance Watts
Oven 3,000 Watts LED TV 100 Watts Well Pump 1/3HP 750 Watts
Refrigerator**
18 cu.ft.
1,200 Watt-hours/day LED Monitor 80-100 Watts Well Pump 1/2HP 1,000 Watts
Freezer**
15 cu.ft. (chest)
1,080 Watt-hours/day Desktop computer 80-120 Watts Sump Pump 1/3HP 800 Watts
Dishwasher 1200-1,500 Watts Desktop computer (Gaming) 400-1,000+ Watts Sump Pump 1/2HP 1,000 Watts
Electric Clothes Dryer 3,400 Watts Laptop computer 40-120 Watts Drill 250-1,000 Watts
Gas Clothes Dryer 300-400 Watts Clock Radio 7 Watts 9" Disk sander 1,200 Watts
Washing Machine 500-1,000 Watts Plasma TV 350 Watts 3" Belt sander 1,000 Watts
Microwave 1,500 Watts LED TV 100 Watts 12" Chain saw 1,100 Watts
Toaster oven 1,200 Watts ipad/Tablet 10-20 Watts 14" Band saw 1,100 Watts
Hot Plate 1,500 Watts Satellite dish 30 Watts Circular saw 1,500 Watts
Electric Skillet 1,500 Watts Cell Phone charger 2-10 Watts Jig Saw 300-700 Watts
Toaster 1,100 Watts Radiotelephone - Transmit 40-150 Watts Chop / Cut Off Saw 1,500 Watts
Coffee Machine 1,500 Watts Radiotelephone-Receive 5 Watts 210 Mig Welder 6,500 Watts
Blender 300-1,500 Watts 100 watt incadescent bulb 100 Watts Air compressor 1HP 2,000 Watts
Vacuum Cleaner 500 Watts 60 watt incadescent bulb 60 Watts Central Air Conditioner 1,000-5,000 Watts
Dehumidifier 500 Watts 25 watt compact fluoresent bulb 28 Watts Room Air conditioner 900-1,200 Watts
Humidifier 300-1,000 Watts 20 watt DC compact fluor. 22 Watts Furnace Blower 300-1,000 Watts
Portable Fan 50-100 Watts CFL Bulb (60-watt equivalent) 18 Watts Portable Heater 1,500 Watts
Ceiling Fan 100 Watts LED Bulb (60-watt equivalent) 10 Watts Stock Tank Heater 100 Watts
Curling Iron 90 Watts Electric blanket 50-150 Watts Garage door opener 350 Watts
Hair Dryer 1,500 Watts Portable water heater 500 Watts Shop Vac 6.5 hp 1,500 Watts