Solar panels alone do not power your home during an outage — grid-tied systems are required to shut off within about two seconds (a safety rule called anti-islanding) to protect line workers. Adding a home battery lets your system "island" and keep running, with solar recharging the battery each day. During Hurricane Beryl, one provider kept nearly 3,000 Houston-area homes powered through the 8-day blackout.
After Hurricane Beryl left 2.2 million CenterPoint customers in the dark for up to a week and a half in July 2024 — many in 100°F heat — Houston homeowners are asking one question about solar: will it actually keep my lights on when the grid fails? The honest answer surprises people: solar by itself won't. Here's exactly how backup works and what you need.
No — not on their own. A standard grid-tied solar system automatically shuts down the moment the grid goes out, even in full sun. This is not a defect; it is a federally required safety feature. So if your only goal is backup power, solar panels without a battery will leave you just as dark as your neighbors during a Houston outage.
The fix is a home battery. With a battery and the right setup, your system disconnects safely from the grid and keeps powering your home — and your panels keep recharging the battery during the day.
Because of a safety rule called anti-islanding. Under the inverter standards IEEE 1547 and UL 1741, a grid-tied inverter must detect a grid outage and disconnect within about two seconds. If it kept pushing power onto the utility lines during an outage, it could create an energized "island" on wires that line workers believe are dead — a serious electrocution risk.
So the shutdown protects the people repairing the grid. The trade-off is that plain grid-tied solar gives you zero backup. To keep power safely during an outage, you need equipment that can isolate your home from the grid first.
A home battery with backup capability solves the problem in three steps:
That third step is the key advantage over a generator: as long as the sun comes up, the system can cycle for days — potentially indefinitely.
Yes — and that's the strongest proof for Houston. During Beryl's roughly 8-day outage in July 2024, solar provider Sunnova reported that its systems kept nearly 3,000 Houston-area customers powered, delivering 485,249 kWh, and that 96% of its Houston backup systems needed no repairs that week (source: Sunnova). The Texas Solar Energy Society similarly reported thousands of Houston homes with solar-plus-storage kept their power through the citywide outage.
This is also why Texans are adopting batteries fast: nationally, the share of new residential solar paired with a battery quadrupled from 6% in 2020 to about 25% in 2024 (Wood Mackenzie), driven heavily by demand for backup after events like Beryl and Winter Storm Uri.
It can — but AC is the demanding part, so sizing matters. A typical 5-ton central AC draws around 3.5 kW while running, plus a large surge when the compressor starts. There are two approaches:
In Houston's heat, AC isn't a luxury during a summer outage — Beryl's heat killed dozens of Texans after the storm. For most Houston homeowners who want AC during an outage, a whole-home configuration is the right call.
| Factor | Solar + battery | Gas/standby generator |
|---|---|---|
| Runs during multi-day outage | ✅ Recharges daily from sun | ✅ While fuel lasts |
| Fuel needed | ❌ None | ✅ Gas/propane/natural gas |
| Works if fuel supply is down | ✅ Yes | ❌ Risk during disasters |
| Noise / fumes | ✅ Silent, clean | ❌ Loud, exhaust |
| Daily value (lower bills) | ✅ Yes, every day | ❌ Only during outages |
| Cloudy-weather limitation | ⚠️ Reduced recharge | ✅ Unaffected |
The structural edge of solar + battery is daily payback (it lowers your bill year-round) plus no fuel dependence during a regional disaster. A generator's edge is uninterrupted output during prolonged heavy clouds. Many resilience-focused Houston homeowners choose solar + battery for everyday savings and multi-day backup.
Do solar panels work during a power outage?
Not by themselves. Grid-tied solar shuts off within about two seconds when the grid fails (anti-islanding) to protect utility line workers. To keep power during an outage you need a battery, which lets your home safely 'island' and run on stored energy while your panels recharge it during the day.
How many batteries do I need to run AC during a Houston outage?
Running central AC during an outage usually requires whole-home backup — typically 30 kWh or more of storage, often two to three batteries, with enough surge capacity to start a 5-ton compressor (about 3.5 kW running). For essentials only (fridge, lights, Wi-Fi), one battery can last two to three days.
How long will a solar battery power my home?
It depends on what you back up. On essential circuits, one battery often lasts two to three days; running central AC can drain it in under a day. The big advantage in Houston: your solar panels recharge the battery every sunny day, so the system can keep cycling through a multi-day outage.
Is solar + battery better than a generator in Houston?
For most homeowners, yes — solar + battery lowers your power bill every day, runs silently with no fuel, and recharges from the sun during multi-day outages (no scrambling for gas during a disaster). A fuel generator's main edge is uninterrupted output during prolonged heavy cloud cover.
Did Houston solar homes keep power during Hurricane Beryl?
Yes. During Beryl's roughly 8-day 2024 outage, Sunnova reported keeping nearly 3,000 Houston-area homes powered (485,249 kWh delivered, 96% of systems needing no repairs), and the Texas Solar Energy Society reported thousands of solar-plus-storage homes stayed powered through the citywide blackout.
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