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EV Batteries Are Dangerous to Repair. Here’s Why Mechanics Are Doing So Anyway
(www.scientificamerican.com)
this post was submitted on 25 Dec 2023
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It's up and running for the Powerwall, on some grids anyway (it works in my state - but depends on having an agreement with the grid).
The thing is there needs to be coordination between your battery and the grid - you don't to drain your battery every night, they only last about 4,000 cycles.
If every home in the state had a Powerwall, then maybe it could help provide baseload power but the reality right now is all it can do is help with temporary disruptions, for example keeping the grid up when a cloud passes over a major solar farm.
They're in the planning stages of doing Vehicle to Grid or V2G power. Right now though, it's just for standalone batteries. This isn't just Tesla by the way - when it comes it'll likely be for most EVs.