What battery-storage product did Tesla launch for homes in 2015?

Tesla launched the home battery-storage product Powerwall in 2015.

Tesla announced Powerwall on April 30, 2015, presenting it as a rechargeable lithium-ion battery for homes and small businesses. It was intended to store electricity from the grid or solar panels and make that energy available later.

The product extended Tesla’s work beyond vehicles into stationary energy storage. A wall-mounted home battery can help shift electricity use, provide backup power, and increase the usefulness of rooftop solar, depending on the installation and local rules.

Powerwall is different from Tesla’s larger commercial and utility products. Powerpack was designed for commercial and industrial installations, while Megapack is a larger containerized system for utility-scale projects. Tesla also later introduced Solar Roof, which generates electricity rather than storing it.