Note: I don’t actually own a Tesla Model S and all I really care about is honesty. I want this question answered honestly so that people can stop lying to each other.
I was reading a brilliant post that pretended that the Electric car had been released first and that the Petrol car was trying to attract its first buyers; I highly recommend that you read that article. But the whole article raised one really important question about how much energy it would take to run your house and car on solar. In it’s distilled form the question is essentially:
How many Solar panels and Tesla Powerwalls would I need to take my Household energy usage and Tesla Model S off the grid? (Such that I don’t need to rely on the Grid and fossil fuels ever again)
To answer those questions I made a publicly available Google Spreadsheet:
To fill in that spreadsheet you only need two pieces of information:
- How much energy your home consumes per day (in kWh).
- How much you drive per day (in km)
With that information you can work out how many solar panels you would need on your roof and how many Tesla Powerwalls you would need to store all of the energy that they generate. I think that you should give it a shot.
However, my conclusion is this: most people that drive close to or under the average for Australian drivers (<= 43km per day) will find that they don’t need significantly bigger Solar Systems and power packs to cover the costs of their Tesla car. And every single home owner on the planet should be able to get enough Solar panels and Powerwalls to cover their household and car energy usage. Good news!
Note: Currently there is no cost analysis here of how much those components will cost. But I will add that companies like Solar City and Sun Edison make getting solar panels a breeze. Also the Gigafactories being build in America right now should dramatically bring down the price of Solar Panels and Powerwalls.
Hopefully this helps somebody and, if you have any questions then please let me know in the comments.