Solar panels can slash electric bills under normal conditions, but many homeowners are surprised to learn that rooftop systems often stop working during a blackout without a battery and switch system.
That surprise can become an expensive one when a freezer full of food, a private well, or other household essentials suddenly lose power, even on a bright, sunny day.
Here's what to know
In a Reddit thread on the r/TwoXPreppers subreddit, users discussed a question that often comes up after storms and utility outages.
The original poster prompted the discussion with a question. "When power goes out I lose my solar panels because my panels can't keep putting electricity back into the grid for safety," they said. "But is there a way to disconnect from grid power and power my house during the day?"
What they needed most was straightforward. They wanted a way to keep food in the freezer from spoiling and continue pumping water from the well.
More background
What a solar setup can do during an outage depends on more than the panels themselves. In many cases, a home also needs equipment such as battery storage, a transfer switch, or a hybrid inverter to disconnect safely from the grid and keep power flowing.
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Commenters also noted that battery backups do not all behave the same way. Some systems can run into black start problems, where batteries drained during an outage may not be able to recharge afterward. That issue can surprise homeowners who assume a costly solar installation automatically provides blackout protection.
"Look into generator transfer switches, solar islanding, and batteries," a top-voted user offered. "Also consider some water storage."
The latter was already on the homeowner's mind after the well went dry. They shared that they "now have 525 gallon storage and a 350 gallon truck tank."
What can be done?
For homeowners who want solar to keep working during outages, the first step is understanding what equipment is already installed. Some systems can be upgraded with battery storage or compatible inverters, while others may require more extensive retrofits.
"Tl;dr: You need a hybrid inverter," one commenter said.
Another commenter said Enphase IQ8 microinverters may keep household power on during a grid outage without a battery during sunlight hours. Beyond that, you'd need at least one IQ Load Controller to maintain system stability in off-grid mode, and you would need an Enphase System Controller or other smart switch to cut the home off from the grid during such an outage as well, since that electricity could backfeed into nearby power lines and shock or electrocute a worker repairing the outage.
A backup-capable system may help a household avoid losing food and keep critical equipment such as refrigerators, fans, or wells operating during outages. For homes that rely on private wells, maintaining access to water may be even more important than preventing food loss.
Homeowners can also ask installers direct questions before purchasing or upgrading a system: Will it operate during a blackout? Does it support manual or automatic transfer? Can it handle a black start? And if the home already has an electric vehicle, it may also be worth asking whether vehicle-to-home backup is possible.
As for the original poster, they had options if they were willing to consult, research, and invest in a true backup.
"You can have a grid tied system with battery backups," a commenter explained. "You just have to have a cutoff so that it doesn't back feed into the lines. This could be a manual switch or an automated switchover (preferred)."
Where can I learn more?
Battery storage, hybrid equipment, and newer solar setups can make the difference during a blackout.
• Across the United States, backup batteries paired with solar are helping more homes ride out blackouts.
• After a hurricane, one homeowner saw solar panels keep the lights on when neighbors lost power.
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