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Arch Rao earned a master's degree in mechanical engineering at Stanford University and began but left a PhD in energy there to work on technologies with greater near-term climate impact. Early in his career he co-founded the building-energy startup Verdigris Technologies and worked at the aviation company Joby. From 2013 to 2018 he was a product leader at Tesla, where he helped lead the development of the Powerwall and Powerpack energy-storage products as well as solar offerings. In 2018 he founded Span in San Francisco to reinvent the home electrical panel as a smart, circuit-level control plane for solar, batteries, EV charging, and the grid, and he serves as CEO, leading the company through major funding rounds and a 2026 partnership with Eaton.
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A smart electrical panel that replaces a home's conventional breaker box, adding circuit-level metering and remotely controllable breakers. Through the SPAN app, homeowners see real-time energy use for every circuit, prioritize which loads stay powered during an outage, and manage solar and battery backup without separate gateways. It enables flexible whole-home or partial backup, supports time-of-use optimization, and serves as the integration hub for home electrification, marketed at roughly $3,500 before installation.
An EV charging product that works with the SPAN Smart Panel to deliver power-aware Level 2 charging without requiring a costly electrical service upgrade. SPAN Drive dynamically modulates charging based on the home's available capacity and other active loads, letting households add EV charging on existing panels. Integrated with Span's circuit-level intelligence, it coordinates EV charging alongside solar, battery, and backup priorities, reinforcing Span's position as the orchestration layer for home electrification.
4 patents on file, but none with both an extractable figure and an abstract on Google Patents yet.
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