Powering your home and car with solar
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The purpose of the following spreadsheet is to help people calculate how many Solar Panels and Tesla Powerwalls you would need to own in order to be energy neutral.
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2) Then update the values in the "Your Details" section to match what you actually use. I recommend looking at your last power bill and your cars odometer.
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3) Look at the values generated to see what solar system you would require (in kW, that's how solar systems are often "sized"). And that's it. You're done.
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Note: There is an imlicit assumption in the constants as to how much solar power each panel will generate. Some regions are higher and some are lower. For a more accurate calculation tweak that number for your locality.
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Kilometers Driven Per Day (km)42.54794521
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Household Daily Energy Consumption (kWh)15.4
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Calculations
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Tesla Range Per kWh (km)5.011764706
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Tesla Daily Battery Consumption (kWh)8.48961348
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Total Daily Energy Consumption (kWh)23.88961348
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System required for House only
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Raw Solar System Required (kW)4.4
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Minimum Solar System Required (kW)5
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Minimum Tesla Powerwalls Required 3
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System required for Car and House
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Raw Solar System Required (kW)6.825603851
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Minimum Solar System Required (kW)7
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Minimum Tesla Powerwalls Required4
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Constants
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Days Per Year (days)365
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Average Australian Driver Yearly Distance (km)
15530
(See: http://www.roymorgan.com/findings/australian-moterists-drive-average-15530km-201305090702)
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Average Australian Household Energy Usage (kWh)
15.4
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Australian Solar Power Generation Estimate3.5
If you have a 1kW solar system then you will generate this much solar power.
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Tesla Model S Range (km)426
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Tesla Model S Battery Energy (kWh)85
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Tesla Powerwall Capacity (kWh)7
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