Islanding Detection
Automated systems in grid-tied inverters that detect when the utility grid has lost power and immediately disconnect the solar system to prevent energizing downed power lines.
Why It Matters
Islanding detection is a safety requirement. It is why grid-tied solar without battery backup shuts off during outages, even when the sun is shining.
Related Terms
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.
Islanding
The ability of a solar + battery system to disconnect from the grid and operate independently, powering the home from stored and locally generated energy during an outage.
Microgrid
A localized energy system that can operate connected to the main grid or independently (islanded). Typically includes generation (solar), storage (batteries), and load management.