You can plug your car in so that it charges while it's parked. The same solar panels taken off the car and put on your works roof would be far more efficient because they face the sun.
What I would love to see is a Tesla that can act as a powerwall and power your house when the grid fails. Some people hack them to do that but it doesn't look simple or without risk.
Not only is this a backup for a rare outage but it makes you money by charging when power is cheap and selling back when expensive. Occasionally the price of power goes negative and you are paid to charge.
https://electricinsights.co.uk/ is good for exploring the energy data and pricing.