Do solar panels work during a power outage?

Why the panels shut off

A standard grid-tied solar system is designed to power your home and export the surplus to the grid. When the utility cuts out, the inverter senses the grid is down and stops producing within about two seconds. This is called anti-islanding protection, and its purpose is safety: if the inverter kept pushing power onto the lines, it could energize wires that utility workers believe are dead, with deadly consequences. So the system shuts down even though the panels are perfectly capable of making power.

It is a safety standard, not a malfunction

This behavior is required, not optional. Grid-tied inverters in North America are built and certified to UL 1741 and the IEEE 1547 interconnection standard, which mandate that a system disconnect from a dead grid automatically. Every compliant system behaves this way, which is why simply owning solar does not give you backup power. To keep the lights on during an outage, you have to add equipment that can safely create its own island, isolated from the grid.

What it takes to have power in an outage

With those pieces in place, your solar and battery keep running your home during an outage while staying safely disconnected from the grid, then reconnect automatically when utility power returns. Some systems back up the whole house; many back up a smaller subpanel of essential circuits, the refrigerator, some lights, internet, and medical equipment, to make the battery last longer.

• A battery: storage is the core of backup. It holds the energy your panels make and can run your home when the grid is down.
• An islanding-capable inverter: a hybrid or battery-based inverter that can safely disconnect from the grid and form its own circuit for your home.
• A transfer switch and backup panel: automatic transfer equipment isolates your home from the grid and routes backup power to the circuits you have chosen.

Battery, generator, or neither?

If backup power is your goal, say so up front so the installer designs for it. The battery guide covers the cost and payoff in detail, and your town dashboard shows local solar pricing.

• Battery: silent, automatic, and recharged by your panels, the cleanest backup if outages are common or important to ride through. It adds roughly half again to a panel-only project.
• Generator: a lower up-front cost for long, rare outages, but it needs fuel and maintenance and does not pair with daytime solar the way a battery does.
• Neither: if your grid is reliable, many owners skip backup entirely and accept that solar pauses during the occasional outage. The wiring can be made battery-ready for later.