What happens to my solar system if San Diego's power grid goes down?
It's a question many San Diego homeowners ask when they're thinking about going solar: if the power grid fails, will my solar panels keep my home running? The answer is more nuanced than a simple yes or no, and it depends on how your system is set up.
Grid-Tied Solar Systems and Outages
Most residential solar installations in San Diego are grid-tied systems. This means your panels connect directly to the utility grid, and you benefit from net metering—sending excess power back to SDG&E when you produce more than you use, and drawing from the grid when you don't.
Here's the catch: during a power outage, a standard grid-tied solar system automatically shuts down. This happens for a critical safety reason. Utility workers need to know that the grid is truly de-energized when they're working on power lines. If your solar panels kept feeding power into a dead grid, it could create a dangerous situation for those workers.
This safety feature means that even on a sunny day, if San Diego's grid goes down, your home goes dark—unless you have battery backup.
Adding Battery Backup Changes Everything
A battery storage system transforms your solar setup from grid-dependent to grid-independent. With a battery backup solution, here's what happens during an outage:
Your solar panels continue generating power during the day. Instead of sending it to the grid (or shutting down), that energy charges your battery system. You then draw power from your batteries to run your home—lights, refrigerator, air conditioning, charging devices, whatever you need within your system's capacity.
When the sun sets, your batteries continue supplying power until they're depleted or the grid comes back online. How long your backup lasts depends on your battery size and home energy use.
Designing the Right Solution for Your San Diego Home
Every home is different. Your backup power needs depend on factors like:
Some homeowners opt for a smaller battery system that covers essentials—refrigerator, outlets, and lighting. Others invest in larger capacity to maintain more comfort and convenience during extended outages.
The Bottom Line
Without battery backup, your solar panels won't help during a blackout. With battery backup, you have power when the grid doesn't. For San Diego homeowners serious about energy resilience, a hybrid solar-plus-battery system is worth exploring.
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About Apollo Home Power
Apollo Home Power serves San Diego homeowners with solar and battery backup solutions. Visit their website at https://apollohomepower.com to learn more about residential solar options.
Apollo Home Power
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