Do Solar Panels Work During a Power Outage?
Solar panels do not work during a PG&E power outage unless paired with battery storage. Standard grid-tied systems shut down automatically when the grid goes offline, even if the sun is shining and your panels are generating power.
This catches many Sacramento-region homeowners off guard. You installed solar to gain energy independence, but when the grid fails, your system stops producing. That shutdown is by design, and it happens for a specific reason.
Why Solar Panels Shut Down When the Grid Goes Down
Solar panels stop working during an outage because of a safety feature called anti-islanding. When the grid loses power, your inverter disconnects your system to protect utility workers repairing lines. Without that shutdown, your panels could send electricity back into the grid and create a dangerous situation for crews working on what they assume are dead wires.
Anti-islanding is required by code in California. Every grid-tied solar system includes this automatic disconnect. Your inverter constantly monitors the grid and cuts off the moment it detects an outage. That means your home goes dark, even if your panels would otherwise be producing energy.
How Battery Storage Keeps Solar Working During an Outage
Battery storage allows your solar panels to continue powering your home during an outage by creating an isolated circuit separate from the grid. When the grid fails, the battery disconnects your home from PG&E's lines and switches to stored energy. Your panels can continue charging the battery, and the battery supplies power to designated circuits in your home.
Not every circuit in your home will stay powered. When designing a battery backup system, you choose which loads matter most: refrigerator, lights, Wi-Fi, medical equipment, or a few outlets. The battery capacity and the amount of sunlight available determine how long those circuits stay live.
What You Can Realistically Power With Solar and Battery Backup
A typical home battery holds between 10 and 15 kilowatt-hours of usable capacity. That's enough to run essential loads for several hours or longer, depending on what you're powering and whether your panels are producing energy to recharge the battery during the day. A refrigerator, a few lights, your phone chargers, and Wi-Fi together draw roughly one to two kilowatts.
If an outage happens during daylight and your panels are producing, your battery recharges while powering your home. That extends how long you can keep those loads running. If the outage occurs at night or on a cloudy day, you're drawing only from stored energy, and runtime shortens. The battery storage systems installed across the Sacramento region vary in size, but most are designed for essential backup, not whole-home power.
Grid-Tied Solar Without Battery Storage Offers No Backup Power
If your solar system does not include a battery, it provides zero backup power during an outage. The panels may be in perfect working order, the sun may be shining, but your inverter will not allow electricity to flow. That's true whether you have a string inverter or microinverters.
Some homeowners assume their solar panels should at least power the house during the day when the grid is down. That assumption is reasonable, but the electrical code does not allow it. The only way to keep your solar system producing during an outage is to add a battery with islanding capability.
Adding Battery Storage to an Existing Solar System
Battery storage can be added to most existing solar panel systems, though the specifics depend on your inverter type and how your system was originally designed. Some inverters support battery integration directly, while others require a second inverter or additional equipment to enable backup functionality.
The conversation starts with understanding your current system and what you want backed up. Aztec Solar works with homeowners who already have solar panels installed and want to add resilience without replacing equipment unnecessarily. If your solar company is no longer in business or unresponsive, that evaluation becomes even more important. You can read more about adding battery storage to an existing solar panel system to understand the process and what to expect.
What Happens During Extended Outages
During extended outages, a solar and battery system can keep essential circuits running as long as the sun continues to charge the battery each day. Your panels produce energy during daylight hours, recharge the battery, and power your selected loads. At night, the battery discharges to keep those circuits live until morning.
Managing energy use becomes more intentional. You may choose to delay running the dishwasher or turn off non-essential devices to preserve battery capacity for lighting and refrigeration. Battery systems often include monitoring apps that show real-time energy production, consumption, and remaining capacity, which helps you make those decisions.
Why Some Homeowners Choose Battery Backup in Northern California
Public Safety Power Shutoffs and storm-related outages have made backup power a practical consideration for many Sacramento-area homeowners. PG&E shuts down sections of the grid during high fire-risk conditions, and those outages can last multiple days. According to the California Public Utilities Commission, millions of Californians have experienced PSPS events since the program began.
Battery storage doesn't eliminate the inconvenience of an outage, but it does reduce the disruption. Homeowners with medical equipment, home offices, or food storage concerns often prioritize backup power. Others simply want to avoid the uncertainty of not knowing when power will return.
If you're weighing whether battery storage makes sense for your home, a conversation about how your household uses energy and what you'd want powered during an outage is the best place to start. Aztec Solar has worked with homeowners across the Sacramento region to design systems that align with how their homes actually function, and we're available to discuss what backup power would look like for your situation.
Frequently Asked Questions
Will my solar panels work during a daytime power outage?
No, not without battery storage. Even if the sun is shining and your panels are producing energy, grid-tied solar systems automatically shut down during an outage to protect utility workers. A battery with islanding capability is required to keep your system running when the grid goes down.
How long will a solar battery keep my home powered during an outage?
It depends on battery capacity, how much energy you're using, and whether your panels are recharging the battery during the day. A typical home battery can power essential circuits for several hours to multiple days if managed carefully and recharged by solar production.
Can I add battery storage to my existing solar panel system?
Yes, in most cases. The specifics depend on your inverter type and system design. Some inverters support battery integration directly, while others require additional equipment. An assessment of your current system determines the best path forward.
Does battery backup power my whole house during an outage?
Typically no. Most battery systems are designed to power essential circuits like refrigeration, lighting, Wi-Fi, and select outlets. You choose which loads to back up during system design based on battery capacity and your household priorities.
Why do solar panels shut off when the power goes out?
Solar panels shut off during outages because of anti-islanding protection, a safety feature required by California code. It prevents your system from sending electricity back into the grid while utility workers are repairing lines, which could create a dangerous situation for repair crews.