How Does a Solar Inverter Synchronize with Grid? Tips Inside
If the grid goes down, the inverter shuts off automatically — this protects utility workers and prevents backfeeding. Modern inverters offer smart features too.
The inverter has an internal computer that senses the current AC grid waveform, and outputs a voltage to correspond with the grid. However, supplying reactive power to the grid might be necessary to keep the voltage in the local grid inside allowable limits.
Smart inverters do more than just convert DC to AC—they actively support the grid. They can regulate voltage, manage reactive power, and ride through minor grid disturbances without shutting off. These advanced functions help maintain a stable power supply, especially during times of high solar output.
If the grid goes down and your inverter keeps sending electricity, it could endanger utility workers fixing the lines. Anti-islanding shuts the inverter off within milliseconds of detecting a grid failure. This safety mechanism ensures your system doesn't operate in isolation—also known as “islanding.”
In the United States (and most of the rest of the world), all inverters that back-feed the grid must conform with “anti-islanding” requirements. Anti-islanding simply means that the inverter stops grid-feed-in when the grid experiences abnormal conditions (frequency/voltage) and/or in the event there is a complete power outage.
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