The Tesla home battery unveiled by Elon Musk in 2015 was called Powerwall.
Tesla introduced Powerwall on April 30, 2015, as a rechargeable lithium-ion battery designed for homes. It could store electricity generated by rooftop solar panels or drawn from the grid, allowing households to use that energy later. The original announcement described a 7-kilowatt-hour daily-cycle model and a 10-kilowatt-hour weekly-cycle model.
Powerwall belongs to Tesla’s energy-storage business rather than its car lineup. The company also developed larger products: Powerpack for commercial and utility customers, and Megapack for large-scale grid storage. Those names are common sources of confusion.
Tesla later released newer Powerwall generations with different capacities and features. The product’s central purpose remained the same: storing electrical energy for later household use, backup power, or managing demand.