Solar Backup or Off-Grid Calculator

For solar backup: Enter what you will need to run in an emergency situation.
For off-grid: Enter what you will be running in your home in an off-grid situation.
Advanced options
 

 
Power Usage:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If you need to run appliances not included in the above calculator, you will need to calculate how much power that appliance will use in a week, and enter that number in the “Other: watt hours per week” box.  You can add up all other appliances and add to that box.  You can use the chart below to help you with appliances.

 

Example:

3 loads of laundry each week, including washing and drying:

If your washing machine takes 1000 watts, and runs for 30 minutes for each load:
30 minutes X 3 loads = 90 minutes = 1.5 hours X 1000 watts = 1,500 watt hours per week

If your drying uses 3,400 watts, and takes 45 minutes to dry:
45 minutes X 3 loads = 135 minutes = 2.25 hours X 3,400 = 7,650 watt hours per week.

 

Add all totals together:
1,500 + 7,650 = 9,150 watt hours per week (9,150 is the number you will enter in the “other” box in the calculator).

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Approximate power usage by appliance.

Appliances Watts Appliances Watts Appliances/Tools Watts
Oven 3,000 Standard TV 188 Well Pump 1/3 hp 750 (Running) 1400-3000 (Starting)
Refrigerator**
20 cu. ft. (AC)
16 cu. ft. (AC)

1411 watt-hours/day* 1200 watt-hourrs/day*
LCD Monitor 80-150 Well Pump 1/2 hp 1000 (Running) 2100-4000 (Starting)
Freezer**
15 cu. ft. (Up)
15 cu. ft. (Chest)

1240 watt-hours/day* 1080 watt-hrs/day*
Desktop Computer (Standard) 80-120 Sump Pump 1/3 hp 800 (Running) 1300-2900 (Starting)
Dishwasher 1200-1500 Desktop Computer (Gaming) 400-1000+ Sump Pump 1/2 hp 1050 (Running) 2150-4100 (Starting)
Electric Clothes Dryer 3,400 Laptop Computer 40-120 Drill (1/4"-1/2") 250-1000
Gas Clothes Dryer 300-400 Clock Radio 7 9” disc sander 1200
Washing Machine 500-1000 Plasma TV 339 3” belt sander 1000
Microwave 1,500 LCD TV 213 12” chain saw 1100
Toaster oven 1,200 iPad / Tablet 10-20 14” band saw 1100
Hot Plate 1,500 Satellite dish 30 Circular Saw 1400-1800
Electric Skillet 1000-1500 Cell Phone - recharge 2-10 Jig Saw 300-700
Toaster 1,100 Radiotelephone - Transmit 40-150 Chop / Cut Off Saw 1500-1800
Coffee Machine 1,500 Radiotelephone - Receive 5 210 MIG Welder 6,500
Blender 300-1,500 100 watt incandescent bulb 100 Air Compressor 1 hp 2000
Vacuum Cleaner 500 50 watt DC incandescent 50 Central Air Conditioner 1000-1500 (Running) 2200-5000 (Starting)
Dehumidifier 350 25 watt compact fluor. bulb 28 Room Air Conditioner 1,100
Humidifier 300-1000 20 watt DC compact fluor. 22 Furnace Blower 300-1000
Portable Fan 100 CFL Bulb (60-watt equivalent) 18 Portable Heater 1500
Ceiling Fan 100 CFL Bulb (100-watt equivalent) 30 Stock Tank Heater 100
Curling Iron 90 Electric blanket 200 Garage door opener 350
Hair Dryer 1,538 Water Heater 479 Shop Vac 6.5 hp 1440

* TV’s, computers, VCR’s, and other devices left plugged in, but not turned on, still draw power.

**To estimate the number of hours that a refrigerator actually operates at its maximum wattage, divide the total time the refrigerator is plugged in by three. Refrigerators, although turned “on” all the time, actually cycle on and off as needed to maintain interior temperatures.

Grid-Tie System Calculator