Why solar switches off
Anti-islanding protection prevents a system from energising grid circuits while engineers may be working on them.
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HEY SOLAR KNOWLEDGE HUBDo solar panels work during a power cut?
A standard grid-connected solar PV system normally shuts down during a grid power cut for safety. Having panels or a battery does not automatically mean your home will have backup power.
THE SHORT ANSWER
A standard grid-connected solar PV system normally shuts down during a grid power cut for safety. Having panels or a battery does not automatically mean your home will have backup power.
Backup needs specific equipment
Some battery systems can provide an emergency or backup supply, but this requires compatible equipment, design and circuits. Capabilities vary significantly.
Whole-home backup is different
Running a few essential circuits is different from supporting every appliance. Power limits, battery capacity and high-demand loads need consideration.
Ask before buying
If resilience is important, make backup capability an explicit design requirement rather than assuming it is included.
HOW WE HANDLE THE DETAIL
HEY Solar keeps technical and financial claims tied to the assumptions that make them true. Guidance is reviewed against authoritative UK sources and property-specific decisions belong in a survey and design.
Knowledge Hub review: September 2026.FROM RESEARCH TO REAL PROPERTY
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A quotation can use the actual roof, electricity use and project requirements rather than generic assumptions.