Energy Calculator
This calculator will connect power & energy units in a meaningful way.
(1) How much electrical energy do you use? 
Method 1: How much is your electrical bill each month?   (in $)
OR
Method 2: How much electrical power do you use?   (in kW)
(Use only one method at a time!)

(2) How much does energy cost you yearly? 
How much electrical energy do you use?  (in kWh a year)
How much do you pay for such energy?   ($ per kWh)
(Note that an average American household uses 10,900 kWh of electricity each year.)
(Fill out both cells!)

(3) How many solar panels or wind turbines does your home (or city) need? 
How many people live in your home/city?   

(4) How much electrical energy should you expect to get from
      solar panels or wind turbines?

SOLAR PV PANELS
Here are the 3 pieces of info, you must enter into the table:
(*) How many panels are going to be put up?
(*) What is the wattage (in W) of each panel?
(*) How many hours of "full sun" (average) are received at the location daily?
    Note: One "full sun" hour is equal to 1 kWh/m2 per day.
Number of panels
Wattage (W)
Average Full Sun Hours
    (Get value)
          (Make sure all cells have a number in them!)

WIND TURBINES
Here are the 3 pieces of info, you must enter into the table:
(*) How many turbines are going to be put up?
(*) What is the wattage (in kW) of the turbine(s)?
(*) What is the efficiency of the turbine(s) given the wind profiles at the location?

Number of turbines
Wattage (kW)
Efficiency
          (Make sure all cells have a number in them!)