The short answer is no, not by themselves. A standard grid-tied solar system shuts off within seconds of a grid failure, even at noon on a cloudless day. Your panels can still make electricity, but the system is not allowed to send it anywhere. To keep your lights on, you need a home battery with a compatible inverter, or a specialized backup inverter that can run a few loads while the sun is up.
Quick answer:
- Panels only (grid-tied): Your home goes dark with the rest of the block.
- Panels plus battery: Your home keeps running, and the panels recharge the battery in daylight.
- Backup inverter without a battery: A few small loads work, but only while the sun is shining.
- Off-grid system: Outages do not affect you, because you never depended on the grid.
This guide explains why solar shuts down, what happens if you have solar and the power goes out, and how to use solar panels during a power outage with the right equipment. It also shows what backup adds to a 2026 solar estimate, so you can decide how much protection your home actually needs.
Do Solar Panels Work During a Power Outage? (By System Type)
Whether your panels work in a blackout depends on how your system is wired, not on how many panels you own.
| System type | Works during an outage? | Why |
|---|---|---|
| Grid-tied, no battery | No | The inverter shuts down to protect utility workers |
| Grid-tied with a battery and hybrid inverter | Yes | The system disconnects from the grid and runs your home as a safe “island” |
| Grid-tied with a backup-capable inverter, no battery | Partly | A few outlets work in daylight only, and nothing works at night |
| Off-grid with batteries | Yes | It never relied on the grid in the first place |
| Portable solar generator | Yes, for a few devices | It runs on its own battery and is separate from your rooftop system |
Why Solar Panels Shut Off When the Power Goes Out
When the utility loses power, line workers head out to repair the damage, and they need those lines to be dead. If your solar system kept pushing electricity onto the grid, it could send dangerous voltage down a line that a worker believes is safe. To prevent that, grid-tied inverters are required to stop feeding the grid the instant they detect an outage.
What anti-islanding means
Anti-islanding is the name for this safety behavior. An “island” is a small pocket of the grid that stays energized after the rest has gone dark. Anti-islanding rules guarantee your system never creates one by accident.
- It is a code requirement for every compliant grid-tied system.
- It is not a defect, and your installer did not cut a corner.
- It is the reason owning panels is not the same as owning backup power.
Rapid shutdown rules (NEC 690.12) are a separate requirement. They focus on lowering the voltage on the roof so firefighters and emergency crews can work safely.
Why the panels cannot just power your house directly
A grid-tied system has no reservoir in the middle. Surplus power flows out to the utility, and any shortfall flows in from it. The grid acts as a giant battery you never see. When the grid disappears, your system loses both its safety reference and its outlet for extra power, so it has no safe way to keep running. How a system is wired, whether grid-tied, off-grid, or a hybrid with a battery, decides whether it can operate on its own.
What Happens If You Have Solar and the Power Goes Out
Here is what a typical homeowner experiences, depending on the setup.
With a grid-tied system and no battery:
- The grid fails, and your lights go out.
- Within seconds, the inverter detects the outage and stops producing AC power.
- Your panels keep generating DC power, but it has nowhere safe to go.
- When the grid returns, the inverter waits through a short safety check and restarts on its own.
With a solar plus battery system:
- The grid fails, and the system disconnects your home from the utility lines.
- Your battery starts powering the circuits you chose to protect, often in a fraction of a second.
- During the day, your panels recharge the battery while it powers the house.
- When the grid returns, the system reconnects automatically.
How to Use Solar Panels During a Power Outage
There are several ways to get power from solar when the grid is down. Each one trades cost against how much of your home it can power.
| Option | Works at night? | Typical cost range | Best for |
|---|---|---|---|
| Solar battery with hybrid inverter | Yes | About $8,000 to $17,000 per battery in California before incentives | Real whole-home or essential-loads backup |
| Backup-capable inverter, no battery | No | Lower than a battery, but a smaller benefit | Keeping a fridge and phone charger alive on sunny days |
| Portable solar generator | Yes, until it drains | A few hundred to a few thousand dollars | Powering a few devices |
| Gas or propane generator | Yes, while fuel lasts | Lower upfront cost, plus fuel | Heavy loads on a tight budget |
| Off-grid system | Yes | Highest | Remote properties with no utility line |
Solar plus battery: the most complete answer
A home battery gives your system a place to store power and a safe way to run while disconnected from the utility. It also does daily work, storing midday solar for expensive evening hours. If you want the full mechanics, our guide to how solar and battery systems work together walks through the hybrid inverter and the order power flows in.
Backup inverters without a battery
Some inverter systems, including certain microinverter setups, can power a small set of outlets straight from the panels during a sunny outage. This is a lighter, cheaper option, but it will not run your refrigerator overnight, and it does nothing once the sun sets. The type of inverter on your roof largely decides which of these options are open to you.
Portable solar generators
A portable solar generator is a battery you can carry, and you can charge it from small folding panels. It is useful for phones, lights, and a small fridge. It is not connected to your rooftop system, so it does not make your existing panels work during a blackout.
Solar Power During a Blackout: How Long Will a Battery Last?
Battery runtime depends on what you ask it to power. These are illustrative estimates for one battery with about 13 kWh of usable capacity and no sun to recharge it.
| What you back up | Typical draw | Approximate runtime |
|---|---|---|
| Essentials: refrigerator, Wi-Fi, lights, phone charging | 0.4 to 0.8 kW | About 16 to 32 hours |
| Essentials plus TV, microwave, and laptops | 1 to 1.5 kW | About 9 to 13 hours |
| Whole home including central air conditioning | 3 to 5 kW | About 3 to 4 hours |
Sunlight changes the math. In daylight, your panels recharge the battery while it powers the home, which can stretch a well-sized system through a multi-day outage. Actual results vary with battery size, panel output, weather, and how carefully you manage your loads.
Essential Loads vs Whole-Home Backup
Backup is not all or nothing. This choice has the biggest effect on cost and runtime.
| Essential loads backup | Whole-home backup | |
|---|---|---|
| What stays on | Refrigerator, some lights, internet, phone charging, a medical device | Nearly everything, including air conditioning, electric oven, and well pump |
| Typical batteries needed | Usually one | Often two or more |
| Cost | Lower | Higher |
| Best for | Short to medium outages | Households that cannot lose any major system |
Deciding early keeps your estimate honest about what the battery will and will not carry.
Solar Plus Battery vs a Backup Generator
| Factor | Solar battery | Gas or propane generator |
|---|---|---|
| Fuel | Recharges from the sun | Needs fuel on hand |
| Noise and exhaust | Silent, no exhaust | Loud, with exhaust |
| Startup | Instant | Manual or delayed start |
| Everyday value | Lowers your bill daily | Idle until an outage |
| Upfront cost | Higher | Lower |
| Maximum output | Limited by battery size | Can be very high |
A generator wins on upfront cost and raw output. A battery wins on convenience, cleanliness, and daily value. Many California homeowners now favor storage because it does double duty. That daily-savings side is part of whether solar actually saves money in California.
Public Safety Power Shutoffs and California Outages
During high fire-risk conditions, California utilities deliberately cut power to large areas to keep energized lines from sparking wildfires. These public safety power shutoffs can last hours or several days.
- They usually happen in dry, sunny weather, when your panels produce the most.
- A solar plus battery system can recharge each day even while the grid stays off.
- For foothill and canyon communities, this is often the strongest reason to add storage.
Outages are becoming more common nationwide, too. The U.S. Energy Information Administration reported that the average customer went without power for roughly 11 hours in 2024, and its analysis points to severe weather as a major driver. Storms, heat waves, hurricanes, and winter freezes all raise the value of having backup.
What Backup Adds to Your Solar Estimate
Backup is one of the largest swings in a quote. In California in 2026, a single battery configured for backup typically adds about $8,000 to $17,000 before incentives.
| Cost item | What it covers |
|---|---|
| Battery | The stored energy itself |
| Storage or hybrid inverter | Converts and routes power between panels, battery, and home |
| Backup gateway or transfer switch | Performs the safe disconnect from the grid |
| Labor and permitting | Extra wiring, protected loads panel, and inspections |
For a deeper look at storage pricing, see what a battery adds to your estimate and our comparison of solar battery types. If you are comparing bids, make sure each one assumes the same level of backup, because a cheaper quote may have left out the gateway. Storage is one of the biggest factors in what determines your solar estimate, and the full cost of a solar system in California in 2026 sets the baseline without backup.
Incentives that help cover backup
The federal residential solar tax credit for homeowner-owned systems ended on December 31, 2025, so no honest 2026 estimate should apply it to your panels or battery. What remains are state and utility programs, and several reward adding storage.
- California’s storage rebate can lower the net cost of a qualifying battery.
- Larger amounts may apply for high fire-risk areas or medical baseline households.
- Funding comes in rounds, so availability depends on timing and your utility.
The California solar rebates and incentives still available in 2026 list the current programs.
How to Stay Safe With Solar During an Outage
- Do not try to bypass the shutoff. The shutoff protects line workers and your equipment.
- Never backfeed your home with a generator through an outlet. Use a properly installed transfer switch.
- Do not touch panels, wiring, or the inverter if you see damage after a storm.
- Check your battery settings before storm or fire season. Some systems have a backup reserve mode that holds charge for outages.
- Know which circuits are protected. Your installer can label them so you know what will and will not work.
How to Make Sure Your System Is Ready Before the Next Outage
Use this checklist when you are shopping or reviewing an existing system.
- Confirm whether your inverter is hybrid or battery-ready.
- Ask which circuits are on the protected loads panel.
- Ask how many hours the battery can run your essential loads without sun.
- Confirm that the system recharges from solar while the grid is down.
- Ask whether the battery has a backup reserve setting.
- Compare pairing options in our guide to the Qcells home battery.
- Check how backup interacts with California’s export rules in our explainer on NEM 3.0 net metering.
How Axia Solar Estimate Sizes Backup for Your Home
Axia Solar Estimate starts the backup conversation with a question most quotes skip: what do you need to keep running, and for how long? A home that wants a refrigerator and internet through a short outage needs a very different system than one that wants air conditioning through a multi-day shutoff.
Your quote separates the battery hardware, storage inverter, transfer gateway, labor, and any storage incentives into visible line items. You can compare essential-loads backup against whole-home backup and choose deliberately. Backup sizing is a different calculation from sizing the panel array to your home, and our full solar estimate guide for California shows how it all fits together.
The Bottom Line: Can Solar Keep Your Lights On?
Panels alone cannot keep your lights on, because safety rules shut a grid-tied system down the moment the grid fails. Add a battery and a compatible inverter, and the answer becomes a confident yes, within the limits of what you size it to carry. The real decision is how much of your home you want protected and for how long.
When you are ready to see what outage protection would add for your home, you can request a solar estimate from Axia Solar Estimate and size your backup with real numbers.
Frequently Asked Questions
Do solar panels work during a power outage?
Not on their own. A standard grid-tied system shuts off automatically when the grid goes down, even in full sun, because of a safety rule called anti-islanding. To keep producing power during an outage, you need a home battery and a compatible inverter that can safely disconnect your house from the grid.
Why does my solar shut off when the power goes out?
Your inverter is required to stop feeding electricity to the grid during an outage so it cannot injure utility workers repairing the lines. Without a battery and the switching equipment to isolate your home, the inverter has no safe option except to shut down until grid power returns.
What happens if I have solar and the power goes out?
With a grid-tied system and no battery, your home loses power just like your neighbors’ homes. With a solar plus battery system, your home switches to battery power, and your panels recharge the battery during the day while the grid stays down.
How can I use solar power during a blackout?
You have five main options: a solar battery with a hybrid inverter, a backup-capable inverter for daytime use, a portable solar generator for a few devices, a gas generator, or an off-grid system. A battery with a hybrid inverter is the most complete option for a home that stays connected to the grid.
What do I need to keep my lights on during an outage?
You need energy storage. Specifically, that means a home battery, an inverter that can operate without the grid, and a backup gateway or transfer switch. You also choose whether to back up essential circuits or the whole home, which changes both cost and runtime.
How long will a solar battery power my house?
It depends on what you back up. One battery running only essentials can last roughly a day, while the same battery running a whole home with air conditioning may last only a few hours. Daytime sun extends this, because the panels recharge the battery while it powers the home.
Can solar panels charge a battery during a power outage?
Yes, if the system is designed for it. A solar plus battery system with a hybrid inverter can keep charging from the panels in daylight while the grid is down. A grid-tied system without that equipment cannot.
Is a solar battery worth it just for backup power?
For many homes, yes. A battery keeps essentials running during outages and public safety shutoffs, and it also lowers your everyday bill by storing daytime solar for the evening. A generator only earns its cost during the hours the grid is down.