A German Tesla owner has given his used Model 3 battery pack a second life by converting it into a 79 kWh home energy storage system charged by 11 kW of rooftop solar panels. This is a real-world example of something the EV industry has talked about for years but rarely shown in practice — that EV batteries don't die when they leave the car, they just move to a less demanding job. For context, Tesla's Powerwall 3 offers 13.5 kWh of storage while this repurposed Model 3 pack delivers nearly six times that capacity from a battery that was supposedly used up. This is the kind of circular economics that makes EVs fundamentally different from gas cars — because when a combustion engine is done it is scrap metal, but a Tesla battery degraded past its useful range for driving still has enough capacity to power a house. As millions of first-generation EV batteries start reaching retirement age, this second-life market is going to become a massive industry of its own.
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