The man behind Tesla's Powerwall is now pitching an all-in-one power management system for homes

Arch Rao, the former head of product at Tesla who was behind the company's Powerwall home energy storage is system, is back with a new company pitching energy management and efficiency for homes. Span is looking to upgrade the electrical fuse box for homes with a digital system that integrates into the existing circuit breaker technology that has been the basis for home energy management for at least a century. Rao and his team are looking to make integrating renewable power, energy storage and electric vehicles easier for homeowners by redesigning the electrical panel for modern energy needs.