Panels and No Power: What a Solar Home Does in an Outage

A buyer stands in the driveway of a Claremont home, looks at a roof covered in panels, and concludes that the power stays on here when it goes off everywhere else.

For most solar homes, that conclusion is wrong. When the grid goes down, a conventional grid-tied array shuts down with it, and the house goes dark exactly like the one next door. The panels produce nothing, because they are not permitted to.

This gets described as a myth to be corrected, which undersells it. It is a live source of buyer disappointment and, occasionally, of a seller's marketing overstating what a property actually delivers. Both are worth avoiding.

Anthony is a real estate licensee, not a contractor, an electrician, a lender or a tax adviser. Nothing here describes any particular system. Equipment configurations, utility rules and interconnection requirements change; verify how a specific property behaves with a qualified licensed contractor, the equipment documentation and the utility before relying on any of it.

Why a grid-tied system shuts down

An array connected to the grid without storage is designed to stop exporting when the grid stops carrying. The reason is safety: crews restoring a circuit must be able to treat it as dead, and a house quietly pushing current back into a downed line is a hazard to the people fixing it.

So the equipment is built and configured to disconnect. That behavior is not a defect, not a setting somebody forgot, and not something an owner should be looking for a way around. It is how the system is supposed to work, and it is a condition of being connected at all.

The result is what buyers find counterintuitive. On a bright afternoon, with a working array on the roof, an outage still means no power in the house.

What changes the answer

Storage changes it, and specific equipment configurations change it. A system paired with a battery, wired so that some or all of the home can run independently when the grid drops, behaves differently. Some equipment also offers limited daytime capability without full storage.

Every one of those is a property of a PARTICULAR installation, not a property of solar. Two houses on the same street with similar-looking arrays can behave in opposite ways during the same outage.

Which means the only useful question is about this house: what equipment is installed, is there storage, and what exactly is wired to keep running. Whether storage is worth adding, and what it is genuinely for, is treated separately in the battery decision guide.

Backup is a scope question, not a yes or no

Where a home does have backup capability, the follow-up question is what it covers, and this is where expectations and reality separate most often.

Backup is commonly configured for a subset of the home rather than the whole of it: certain circuits, chosen at installation, wired to a separate panel. A refrigerator and some lights is a different proposition from central air conditioning and an electric range, and the difference was decided years ago by whoever specified the job.

Duration is a second variable, and it depends on what the household actually draws and on whether the sun is up. A capability that is real can still be far smaller than the buyer imagined.

The questions worth asking are concrete ones. Which circuits are on backup. What documentation shows that. Has it been exercised, and when. None of it can be inferred from the roof.

Why this belongs in a transaction

Two reasons, pointing in opposite directions.

For a BUYER, it is an assumption that should be tested before it becomes a reason for choosing the house. If resilience is genuinely part of the appeal, verify it during the inspection period, from documentation and from the equipment itself, not from the listing photographs. The habit of asking the system's own paperwork rather than guessing is the method described in the first questions guide.

For a SELLER, it is a description problem. A property with panels and no storage is not a property with backup power, and describing it as one invites a complaint. Claims about what a system does are claims about the property, and they are held to the same standard as any other statement made to a buyer. What that duty looks like in practice is covered in the disclosure duties guide.

Accuracy is easy here, because the accurate version is short: this home has a grid-tied array without storage, and it will not power the house during an outage.

Verifying it on a specific house

• Ask directly whether the property has battery storage, and get the answer in writing rather than in conversation.
• Look for a second electrical panel, commonly labeled for backed-up loads, and ask what feeds it.
• Ask for the equipment documentation and the as-installed drawings, which describe the configuration as it was actually permitted.
• Ask whether backup has ever been exercised and what happened.
• Where resilience is a real requirement, have a qualified licensed contractor evaluate it during the inspection period. A general home inspection is not a solar system evaluation.
• Ask the utility about anything touching interconnection, rather than assuming a neighbor's answer applies here.

The reasonable expectation

Solar and backup power are two products that share a roof. One reduces what the house draws from the grid over a year. The other keeps specific things running when the grid is out. A home can have the first without the second, and most do.

Buying for the first is a sound reason to like a solar home. Buying for the second, without checking, is how a buyer ends up sitting in the dark next to a roof full of panels, wondering what happened.

Where to go next

Confirm what is on the roof and whether anything is in the garage, then read the equipment documentation. The wider set of ownership and transaction questions is collected in the solar homes guide.

Anthony Grynchal has been licensed in California since November 2009.