A Second Life for EV Batteries
The idea that EV batteries end up in landfills is being challenged—and with proof. Francisco Shi, an engineer based in Australia, is showing just how much life is left in these powerful packs. From wrecked Teslas and BYDs, he’s creating something remarkable: grid-connected mini power stations.
His work demonstrates that second-life EV batteries are not only safe and functional but also profitable. In fact, he earns up to AU$1,400 in a single night.
From Waste to Wealth
Francisco started by designing systems to safely discharge EV batteries for recycling. But during the process, he discovered something better—most batteries didn’t need to be shredded. Instead, they could be reused whole.
He now sources batteries from written-off EVs, builds stacks, and connects them to hybrid inverters. These setups store solar energy during the day and sell it back to the grid at peak prices.
The Economics of Reuse
Francisco uses 60 kW of rooftop solar and plans to double it. With grid prices spiking up to $7 per kWh during peak hours, the margins are significant. He explains that if you get the battery from a wreck and sell leftover parts, the battery is nearly free.
His return on investment? Often faster than expected. Even when buying power during negative price events, he only pays network fees, which still allows a strong profit margin.
A Model for the Future
EV batteries may outlive the cars they come from—often functioning 10 years longer. That makes them ideal for residential and industrial energy storage.
Francisco’s work also points to larger possibilities. With solar, second-life batteries, and the right setup, many buildings could become energy hubs—earning, not spending, from the grid.
The takeaway? These batteries aren’t done yet. In fact, they might just be getting started.
