Do solar panels work during a power outage?

Most rooftop solar systems are grid-tied, which means they need a live connection to the grid to operate. That means, when your utility's power goes out, your grid-tied solar panels automatically shut down, even in the middle of a sunny afternoon. Your panels are still capable of generating electricity, but the system won't let that power flow anywhere.

The only way around this is a home battery (or a specialized backup inverter) that lets your solar array disconnect from the grid and power your house on its own. Without one, solar panels and outages just don't mix.

This shutoff isn't a flaw. It's a safety feature for utility workers called "anti-islanding," and it's required by code on nearly every grid-tied solar panel system.

Here's the logic: when you're connected to the grid, any extra electricity your panels produce doesn't just sit there. It flows out through your electrical panel and onto the local power lines, where it can earn you bill credits through net metering. That's great on a normal day. During an outage, though, those same power lines are often what utility crews are working on to restore service. A solar system that kept pushing electricity onto a "dead" line could electrocute a lineworker who assumes it's safe.

To prevent that, your inverter constantly checks for a signal from the grid. The moment that signal disappears, it cuts off production within a couple of seconds and won't switch back on until the grid comes back online. It's a simple, effective way to keep everyone safe, but it also means your solar investment can't help you when you need backup power most, unless you've added the equipment to change that.

A home battery gives your system a way to "island" itself safely. Instead of running on the same live grid connection, a battery-backed system can isolate your house from the grid entirely and run off stored energy, plus whatever your panels are producing in real time.

Think of it less as a battery and more as a microgrid for your house: solar panels generate the electricity, the battery stores it, and a smart inverter routes it to your outlets. None of it touches the grid, so there's no safety issue and no reason for the system to shut down.

Some setups can offer a smaller version of this without a full battery. Backup-capable microinverters, like those in Enphase's Sunlight Backup system, can power a few small loads during a sunny daytime outage. It's a lighter-weight, less expensive option, but it won't run your fridge overnight and it does nothing once the sun sets. For most homeowners who want real protection during a blackout, a battery is the more dependable route.

One home battery, paired with solar, can typically keep essential loads like your refrigerator, Wi-Fi router, and a few lights running for a day or two, even without sunshine to recharge it.

If you want to add central air conditioning, an electric dryer, or other high-draw appliances to that list, you'll generally need two or more batteries working together.

A good installer will walk you through this trade-off before you sign a contract:

• Partial backup: One battery covers your critical loads and stretches your runtime, at a lower upfront cost.

• Whole-home backup: Multiple batteries (or one larger unit) keep nearly everything running, including big appliances, for a higher price tag.

There's no universally "right" answer here—there are different levels of home batteries. It depends on what you're trying to protect: a freezer full of food, a medical device that can't lose power, or simply your sanity during a multi-day outage.

Gas and propane generators have been the default backup option for decades, and for some homes, they still make sense, especially if outages are rare where you live and your budget is tight. But solar-plus-storage has a few advantages worth weighing:

• No fuel to run out of. A generator is only as reliable as your fuel supply, which can be hard to find during a widespread outage. A battery just needs sunlight (or a charged grid connection beforehand) to keep going.

• Quieter and cleaner. Batteries don't burn fuel, so there's no noise, exhaust, or trips outside in a storm to refill a tank.

• Everyday value, not just emergency value. A generator sits idle until you need it. A solar-plus-battery system can lower your electric bill and shift your usage to cheaper rate periods every single day, on top of standing by for the next blackout.

Generators still win on upfront cost and on raw power output for very high-draw whole-home setups. The right choice comes down to your budget, how often your area loses power, and how much you're already invested in solar.

Power outages aren't a rare inconvenience anymore. U.S. electricity customers experienced an average of about 11 hours without power in 2024, nearly double the average from the prior decade, according to the U.S. Energy Information Administration. Separate research from J.D. Power found that 45% of utility customers experienced at least one outage in the first half of 2025 alone, with outages in the South lasting an average of 18 hours as extreme weather puts more strain on aging grid infrastructure.

If any of the following sound familiar, a solar-plus-battery system deserves a serious look:

• Your area sees frequent or lengthy outages, especially from storms, heat waves, or wildfires

• You rely on a device that genuinely can't lose power, like a medical machine or a sump pump protecting your basement

• Your utility offers weak net metering rates, so storing your own solar electricity is worth more to you than sending it to the grid

If your grid is rock-solid and outages are a once-a-decade story where you live, a smaller investment, like a plug-in battery for a few key devices, might make more sense than a full whole-home system. EnergySage's home battery guide breaks down all the options, from portable power stations to whole-home systems, so you can figure out where your household falls.

When you register on the EnergySage Marketplace, you can request quotes from vetted local installers and tell them upfront that backup power is a priority so they design your system with that in mind from the start.