Do solar panels work during a blackout?

Usually not. A standard grid-connected solar system shuts down during a blackout, which protects line workers repairing the network. Power during an outage needs a battery with backup capability and a dedicated backup circuit installed for it. Even with a shutdown, panels still produce power in daylight, so keep clear of the equipment.

Why does solar stop when the grid goes down?

A grid-connected inverter is designed to stop sending power into the network when the grid fails. If it kept going, it could feed electricity into lines that workers believe are dead. The shutdown is a safety feature, not a fault, even if it feels frustrating on a sunny day.

That means the lights going out in your house during a blackout, with panels in full sun, is normal for most systems.

What does it take to have power in a blackout?

Backup needs a battery that is capable of backup, and a backup circuit wired for it. Not every battery does this, and not every battery system is set up for it. Some batteries only store power for use when the grid is working, and they shut down in an outage like the rest of the system.

If you want to know which you have, check the paperwork from your installation or ask your installer. Do not try to work it out by inspecting the equipment.

What will a backup system power?

Backup typically covers selected circuits, such as lighting, the fridge and some power points, rather than the whole house. Large loads like ovens, air conditioners and some hot water systems are often left off the backup circuit. A battery also has a limit on how much it can supply at once and how long it lasts, so ask your installer what yours is designed to cover.

What happens when the power comes back?

Grid-connected inverters check the grid before they start sending power again, so expect a delay before your system is back to normal. This is usual. If the display shows an error, or the system does not return after a reasonable time, note any code and contact your installer. See our page on restarting solar systems for why this should follow your installer's instructions.

What should I do during an outage?

Contact your network provider's faults line if the outage looks wider than your home. Look at what the inverter display or app shows and note it, without touching anything. If your lights are out but neighbours have power, that is a different problem, and a licensed electrician should look at it.

What should I ask if I want backup power?

• Which circuits will the battery keep running, and which will it leave off?
• How long can it run them, and what happens on a cloudy day?
• Does it switch over automatically when the grid fails?
• Is it suitable for medical equipment, or should I have another plan?
• Are there any limits on what it can supply at once?

If anyone in your household depends on powered medical equipment, do not rely on solar alone. Speak to your medical provider and your network provider about a plan for outages. Ask for the answers in writing, so you know what to expect the next time the grid goes down.