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xkcd #3214: Electric Vehicles
(imgs.xkcd.com)
Title text:
Now that I've finally gotten an electric vehicle, I'm never going back to an acoustic one.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3214/
Most places with solar panels hooked up to the grid, you can't use the power from them when the grid is down. Safety thing so you aren't back feeding into the grid.