In this guide
Short answer: no. A grid-tied plug-in solar kit switches off within a fraction of a second when the grid goes down, even in full sun, and restarts by itself when power returns. That's required by every state law and by the safety standards. For outage power you need a battery with a separate backup outlet or a portable power station.
Why it shuts off
- Line worker safety. Crews repairing a downed line assume it's dead. A solar device pushing power back through your home's wiring and transformer could energize it. Utah's law, the first in the country, requires a device that can stop energizing your wiring during an outage, and Vermont's requires one that can't energize the building's system in an outage. Every later law has similar wording.
- The inverter needs the grid. A plug-in microinverter syncs to the grid's voltage and frequency. When they vanish, it stops. This "anti-islanding" protection is tested under UL 1741, IEEE 1547 and UL 3700.
- Your outlet isn't isolated. Without the grid, your kit would try to power every appliance on the circuit and beyond, far more than it could supply.
What happens step by step
- The grid drops. The inverter detects missing voltage or abnormal frequency.
- It stops output, typically within two seconds and often much faster.
- Its app shows "grid fault" or zero production.
- When the grid comes back and stays stable (often about five minutes), it reconnects automatically.
If a kit keeps producing during a real outage, unplug it and stop using it: it's not working as certified. And never run any generator or power station into a wall outlet with a male-to-male cord.
Ways to get solar power during outages
| Option | What it powers | Typical cost |
|---|---|---|
| Portable power station + folding panel | Devices plugged into it: fridge for hours, phones, lights, CPAP, router | $500 to $2,500 |
| Plug-in battery with a backup outlet | Its own outlet during outages; your home normally | $1,200 to $2,000+ |
| Rooftop solar + home battery | Selected circuits or the whole home | $15,000+ |
A plug-in kit and a power station work well together: the kit cuts your bill all year, and the station, kept charged from the wall, covers outages. Compare them in plug-in solar vs a power station and plug-in solar with a battery.
How much backup do you need?
- Fridge: about 1 to 2 kWh a day. A 1 kWh station keeps it cold for most of a day if you open it little.
- Router and phones: 0.2 to 0.3 kWh a day.
- CPAP: about 0.3 to 0.6 kWh a night, depending on humidifier use.
- LED lights: under 0.1 kWh an evening.
Add up your must-haves for 24 hours, then pick a station a bit bigger. A 400 W panel can refill 1 to 2 kWh on a sunny day.
Frequently asked questions
Will my plug-in solar panels work during a blackout?
No. A grid-tied plug-in kit must stop producing when the grid goes down. Every US plug-in solar law requires it, and certified microinverters detect the outage within a fraction of a second and switch off.
Why does plug-in solar shut off in an outage?
To protect utility workers repairing lines, who expect them to be dead, and because the inverter needs the grid's voltage as a reference. Feeding a dead grid is called islanding, and certified inverters are tested to prevent it.
Can I get backup power from balcony solar?
Yes, with a battery that has a separate backup outlet, or with a portable power station charged by a panel. Both run devices plugged directly into them, separate from your home's wiring.
Does plug-in solar start again automatically after an outage?
Yes. When the grid returns, certified inverters wait a few minutes to confirm stable voltage and frequency, then reconnect by themselves.
Update log
- Guide published.
Sources and official texts