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Off Grid Solar Load Calculator

One of the most important things to do BEFORE going solar is to calculate the amount of electricity you are currently using. You will use this information to determine the size of solar power system you will need. Our Solar Load Calculator can help you calculate your system load. To learn more about estimating your average energy usage, go to: Electrical Load Evaluation Calculation and System Design Information.

Load Calculator Instructions:

  • Fill out each field for each appliance, if you are unsure about the wattage of your appliance, click on "Add Appliance From Load Chart" button to add that appliance from the list that we prepared for you, with estimated wattage.
  • Use "Add Appliance" to add an empty row, and the "X" button on the right to each row to delete that row.
  • You can save the calculation to your email by filling out the form underneath the Load Calculator and click on "Send" button. Fields marked with "*" are required.

NOTE: This calculator is intended for helping us design off-grid solar systems. If you need a grid-tie or utility interactive system, please contact our office for a quotation. For grid-tie systems, you will need to know the maximum amount of energy your home consumes during the year. For most people, this occurs during the summer months due to running an air conditioner. You can find this information on your electrical utility bill. If you have any questions regarding your utility bill, we are here to help! Contact us at (800) 383-0195 or windsun@wind-sun.com.


Appliance Quantity Watts Minutes On/Hour Hours On/Day Days On/Week Average Watt Hours/Day Max Watt Hours/Day  



Total Average Watt-Hours/Day:
Total Max Watt-Hours/Day:
Load Chart
Appliance Watts Appliance Watts Appliance Watts
Clock radio 10 0 2 Coffee maker 1050 0 1 Clothes washer 425 0 1
Electric clothes dryer 3400 0 1 Natural gas clothes dryer 300 0 1 Dishwasher 1800 0 1
Dehumidifier 785 0 1 Electric blanket 80 0 1 Ceiling fan 120 0 1
Window fan 150 0 1 House furnace blower fan 900 0 1 RV furnace blower fan 100 0 1
Hair dryer 1540 0 1 Portable heater 1250 0 1 Clothes iron 1400 0 1
Microwave oven 1000 15 0 Personal computer 250 0 1 Computer monitor 150 0 1
Laptop computer 50 0 1 Home stereo 100 0 1 Refrigerator (18 cubic ft.) 69 0 24
Freezer (17 cubic ft.) 79 0 24 Game console (XBOX 360) 135 0 1 Hot plate 1200 0 1
Toaster oven 1250 0 1 20" LED flatscreen tv 25 0 1 30" LED flatscreen tv 35 0 1
40" LED flatscreen tv 45 0 1 40" Plasma flatscreen tv 60 0 1 50" LED flatscreen tv 60 0 1
50" Plasma flatscreen tv 109 0 1 60" LED flatscreen tv 75 0 1 60" Plasma flatscreen tv 165 0 1
Toaster 1100 0 1 DVD/Blu Ray player 30 0 1 Vacuum cleaner 1220 0 1
Electric water heater (40 gal.) 5000 0 1 Satellite receiver or cable box 35 0 1 1/3 hp well pump 365 0 1
1/2 hp well pump 525 0 1 RV water pump 100 0 1 Compact fluorescent bulb (CFL) 25 0 1
LED light 15 0 1 30 watt incandescent bulb 30 0 1 50 watt incandescent bulb 50 0 1
60 watt incandescent bulb 60 0 1 75 watt incandescent bulb 75 0 1 100 watt incandescent bulb 100 0 1
150 watt incandescent bulb 150 0 1 Cable Modem or DSL 6 0 24 Smoke Detector 5 0 24
Air Conditioner (Window Unit) 1500 0 12 Air Conditioner (Central AC) 3500 0 12 1 hp well pump 1050 0 1

Send the calculation to your email:
Your Name: *
Phone Number:
Your Email: *
Your Zip Code: *
Desired System Battery Voltage:
Comments:
Send calculations to
Northern Arizona Wind & Sun for Quote