Battery Storage for Blackout Backup: Is It Worth It?
Many homeowners with solar start considering battery storage, hoping it will keep the lights on during a blackout. This article covers the trade-offs to help decide whether it's worth it for your home.
Standard Solar Doesn't Provide Automatic Backup During an Outage
A typical grid-tied self-consumption solar system is designed to shut off automatically when grid power goes out, for the safety of utility crews repairing the line. That means a home with only panels and a standard inverter has no power during an outage — even in bright daylight.
How Battery Storage Actually Works
A battery storage system stores surplus power generated during the day for later use, and can be configured with a special inverter supporting a backup mode, which automatically supplies battery power to designated circuits when grid power fails.
Added Cost and a Longer Payback Period
Battery systems cost significantly more than solar panels alone, and the battery's payback period is usually much longer than the solar panels themselves — since a battery's main value is peace of mind from backup power, not direct electricity savings. It's worth evaluating separately from the main solar system's payback calculation.
Who Should Consider Adding a Battery
Battery storage suits homes in areas with frequent outages, households with medical equipment requiring continuous power, or anyone working from home who needs uninterrupted office equipment. For a typical home in an area with infrequent outages, it may make sense to start with solar alone and add a battery later if needed.
Choose Only the Essential Circuits for Backup Mode
Most batteries have limited capacity and aren't designed to power an entire home at once during an outage. Selecting only truly essential circuits — the refrigerator, main lighting, and internet router — makes the most of battery capacity and extends how long backup power lasts.
Let us help assess whether you need backup power
STR advises on both solar-only systems and systems with battery backup, based on what fits each home.
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