this post was submitted on 13 Jan 2025
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How exactly does an EV become a power plant? If EVs were power plants they wouldn't need charging stations or to be plugged in over night.
The motors in EVs are designed to also provide regenerative services — the charge you put into the battery gets extended by having all “breaking” re-generate power in the battery. So if you’re in a situation where you’re driving down a mountain, you can wind up in a situation where you’re can have more charge when you get to the bottom as you had at the top.
(This is a problem EVs actually have to design around — they’ll turn off the regenerative breaking if your battery is at 100% so you don’t risk overcharging it driving down a long, steep decline).
When removed from the car, you can use the motors like this in a permanent installation. Anything that provides rotational power can then be used to generate electricity — a wind turbine, a water wheel, steam, 2 thousand hamsters — whatever you have on hand. Use that power to turn the motor, and you get electricity out the other end.
These systems aren’t passive, so an EV sitting in a parking lot isn’t going to generate electricity. You need movement from an external source to turn the motors to get power out.
Just a point of...not really correction... additional detail?
Any electric motor is capable of generating electricity. It's about whether the motor is doing work, spinning through electrical input, or if it's being spun by an outside force. This is why you can repurpose an old washing machine into an actually useful hydroelectric generator. The only difference between an electric motor in a washing machine and an EV is power output in terms of torque and speed, there's been some efficiency gains (not really an amazing innovation as there just really wasn't much need in prior typical applications) and finally the fact that they're wired to also generate power while breaking (aka regenerative breaking).
Other than that bit of extra on top, very well explained. 👍
Thanks for adding that — yes, you can do this with any electric motor; EV motors have simply been optimized for this purpose, and can generate power in the kW range. They have the necessary wiring for handling high voltage, along with built-in cooling tubing/conduits.
They’re as close to a drop-in-and-spin electrical generator as you can get. And unlike gas engines they don’t really ever wear out — so it wouldn’t be a surprise to see these become highly available and pretty inexpensive as EV uptake continues to increase, and as we finally start seeing huge numbers of current EVs being taken off the roads due to age in 15 years or so.