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Watts Calculator Worksheet

       To calculate how much power you plan to use, simply estimate your daily usage of each appliance , and multiply watts- look on data plate or manual of appliance, by hours to fill the Watts-Hours column on the right.  Also, you can look at estimated figures we provide under our Energy Watts/Amps Guide  for estimated information about other appliances not shown here.
       It is always better to obtain more precise figures by looking at the electrical specifications labels on your appliances to see how much power they consume.

LIGHTS
       To calculate your light usage, check the wattage of your light bulbs and estimate how many lights you have on, on typical days, and for how long.

EXAMPLE #1:
            3 bulbs X 60W @ 4hours /day= 720W  or 0.72KWh

EXAMPLE #2:

           25W 12V light bulb consumes 2.1amps (A=25/12V)
           To convert to watts: 2.1 amps X 12V= 25.20Watts/hr

Also see Appliance Watts/Amps Calculator
      
       Once you have your total watt-hours, divide that number by 1000 to get your total Kilowatt hours- this is how power usage is measured by your utility grid provider.
       Also, you can review your current electric bill which tells you how many KWh you use each month.  Be sure to compare your summer and winter months.
     Remember once you become a solar energy user you will, most likely, consume less power than you did previously, simply because, you will be conscious of your usage and therefore be inclined to conserve more.
       You will derive the most enjoyment, and make the most efficient use of your solar system, if energy hogs such as large space heaters, electric stoves, water heaters and HVAC systems are operated on propane or natural gas. Use of CFL and LED light bulbs and 12V appliances will allow your system to operate at peak efficiency.

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                                  Watts Worksheet

APPLIANCE               WATTS       HRS/DAY        WATT-HRS.
Blender                          300   X     __________ = ___________
CD Player                     120    X    __________  = __________
Ceiling Fan                    80     X    __________  = __________
Coffee Maker                800   X    __________  = __________
Computer                      100    X    __________  = __________
Crock Pot                      200    X   __________  =  __________
Dishwasher                   1200  X   __________  =  __________
Fax Machine                 140     X   __________  =  __________
Food Processor           450     X   __________  = ___________
Garbage Disposal        390    X   __________  = ___________
Hair Dryer                      1500  X   __________  =  __________
Iron                                  1000  X   __________  =  __________
Lights- Total bulbs         40W  X   __________  =  __________
                                         60W X   __________  =  __________
                                        100W X   __________  =  __________
Microwave                     1100  X   __________  =  __________
Mixer                              150    X   __________  =  __________
Printer- laser                  576    X   __________  =  __________
Refrigerator                   120    X   __________  =  __________
Satellite Dish                 60      X   __________  =  __________
TV                                   100    X   __________  =  __________
Toaster                           1000 X   __________  =  __________
VCR                                40     X   __________  =  __________
Vacuum cleaner            1100 X   __________  =  __________
Additional Appliances              __________  =  __________
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