Anti-Islanding
A safety feature that automatically disconnects a grid-tied solar system from the utility grid during a power outage, preventing the system from energizing downed power lines.
Why It Matters
Anti-islanding is why your solar panels don't work during blackouts unless you have a battery with islanding capability. It's required by UL 1741 and NEC code for all grid-tied inverters.
Related Terms
Grid-Tied System
A solar energy system connected to the utility grid, allowing you to draw power when needed and export excess generation.
Inverter
A device that converts direct current (DC) electricity from solar panels into alternating current (AC) electricity used by your home.
Rapid Shutdown
An NEC (National Electrical Code) safety requirement that solar systems must be able to reduce rooftop DC voltage to safe levels within 30 seconds of initiating shutdown, protecting firefighters and first responders.