Only half a dozen Supercharger stations or so out of the over 800 stations have solar arrays and batteries, but that may be about to change. Elon Musk said Tesla plans to deploy more battery and solar systems with the upcoming “Version 3” of the Supercharger, adding that “almost all Superchargers will disconnect from the electricity grid.” Electrek reports: Previously, Musk said that Tesla’s new Powerpack and solar arrays will power some Supercharger stations in sunny regions to go off-grid — adding that “the grid won’t be needed for moderate use Superchargers in non-snowy regions.” While it makes sense to add solar arrays and battery packs, it’s not clear why there would be a need to completely disconnect from the grid, which is often still useful — especially if net metering is available. Even in regions where coal dominates electricity generation, electric cars are still more efficient than some of the most efficient gas-powered cars. Therefore, the argument could have ended here, but Musk apparently wants to take Tesla’s Supercharger network off-grid as part of the company’s mission to accelerate the advent of sustainable energy. Depending on the size and popularity of a Supercharger station, which generally varies from 6 partly used stalls to 20 stalls in almost constant use, Tesla would need some significantly large solar arrays at some stations — almost football field in size. Unless there are some impressive advancements in efficiency, it’s not clear how they would make it happen.
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