Tesla Expansion Harness 0.5 m The Tesla Expansion Harness (0.5 m) is a short, high-current cable that links Powerwall 3 units to expansion batteries. It’s factory-terminated with secure connectors.
Designed for quick, compact installs, it supports up to three Expansion units per leader Powerwall 3. Weather-sealed to IP67 and rated for –20 °C to 50 °C.