What is Anti-Islanding?
A safety feature that automatically shuts down your solar system during a grid power outage to protect line workers.
Quick Answer
All inverters installed in the UK must have anti-islanding protection as required by the DNO and G98/G99 standards. This means a standard grid-connected solar system will not provide power during a grid outage unless you have a battery with backup capability (EPS, Emergency Power Supply). Some hybrid inverters offer this feature.
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Anti-Islanding Explained
Anti-islanding is a safety mechanism built into grid-connected solar inverters. It automatically disconnects the solar system from the grid if the grid loses power. This prevents the solar system from 'islanding', continuing to feed electricity into the grid and creating a safety hazard for utility workers repairing power lines. Anti-islanding is a mandatory requirement for all grid-connected solar inverters.
How Does Anti-Islanding Work in the UK?
All inverters installed in the UK must have anti-islanding protection as required by the DNO and G98/G99 standards. This means a standard grid-connected solar system will not provide power during a grid outage unless you have a battery with backup capability (EPS, Emergency Power Supply). Some hybrid inverters offer this feature.
Frequently Asked Questions
Will my solar panels work during a power cut?
Standard grid-connected systems shut down during outages due to anti-islanding protection. To have backup power, you need a hybrid inverter with EPS capability and a battery.
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John Rooney is the founder of Solar Info and has been covering the UK solar energy market since 2023. He researches every battery and inverter brand against manufacturer datasheets, MCS and Ofgem data, and feedback from the MCS-certified installers in our directory before publishing.