Do Solar Panels Work During a Power Outage?

The Short Answer

No — not by themselves. Standard grid-tied solar panels shut off automatically during a power outage, even if the sun is blazing. Your house goes dark right alongside your neighbors'.

That surprises most people. After all, the sun is still up. The panels are still making power. So why doesn't anything work?

The answer comes down to anti-islanding — a safety feature built into every grid-tied solar system — and a handful of real solutions that keep your home running.

Why Your Panels Shut Off When the Grid Goes Down

It's not a design flaw. It's intentional — and it's there to protect line workers.

Here's the problem: if your solar system kept pushing power onto the grid during an outage, it would energize lines that utility workers assume are dead. That's electrocution risk on a massive scale.^[1]

To prevent that, every grid-tied inverter sold in the US since 2001 is required to detect a grid outage and disconnect within two seconds. This is called anti-islanding, and it's mandated by UL 1741.^[2]

The result: your panels might be generating 8 kW of power at noon on a sunny day, and every outlet in your house is still dead.

What DOES Work During an Outage

There are three setups that keep your home powered when the grid drops. Each has different cost, complexity, and capability.

1. Solar + Battery Backup (The Sweet Spot)

Adding a home battery — like a Tesla Powerwall 3, Enphase IQ 5P, or Franklin WH — gives you backup power the moment the grid goes down.

How it works: the battery system detects the outage, disconnects from the grid automatically (called islanding), and powers essential circuits in your home from stored energy. When the sun comes back up, your panels recharge the battery.^[a]

What you get:

• Power during outages — from a few hours (refrigerator, lights, internet) to days (if you manage load and the sun returns)
li>Seamless switchover — most people never notice the grid went down
• Daily use too — time-shave your evening load, avoid peak TOU rates

Cost in 2026: $18,000–$28,000 for a single-battery install (10–14 kWh usable), before the 30% federal tax credit. Two-battery setups run $28,000–$38,000. The tax credit applies because battery storage qualifies under the IRA when paired with solar.^[4]

2. Inverter with Secure Power Sleeve (Cheap, Limited)

Some inverters — like the SolarEdge HD-Wave with its Secure Power Supply feature — include a dedicated outlet that works during daytime outages, even without a battery.^[5]

What you get: one outlet producing up to 1,500–2,000 watts — enough for a refrigerator, phone charger, and some LED lights. Only when the sun is shining.

This is a free-ish add-on if your inverter supports it, but it won't power your whole house and it goes dark at night.

3. True Off-Grid System (Rare for Homes)

A fully off-grid solar setup — panels + large battery bank + backup generator — never connects to the utility grid. You're energy-independent by design.

This works for cabins or remote properties where grid connection is impossible or extremely expensive. For a typical suburban home, though, off-grid means oversizing your solar array and battery bank to survive 3–5 cloudy days — and most homeowners aren't willing to give up the grid as a backup.^[6]

How Much Battery Do You Actually Need?

Most homeowners think "whole home backup" is the goal. In practice, critical loads is the smarter target — and it saves thousands.

Here's what's worth backing up vs. what's not:

Back Up	Skip It
Refrigerator / freezer	Central AC (4,000+ watts)
Lights (LEDs draw almost nothing)	Electric dryer
Internet router & modem	Electric oven / range
Phone & laptop chargers	Pool / spa equipment
Medical equipment (CPAP, etc.)	Hot tub
Garage door opener	Electric vehicle charging
Furnace fan / gas heater igniter	Anything you can do without

A single 13.5 kWh Powerwall can run a refrigerator, lights, internet, and phone charging for roughly 24 hours before needing a recharge. Add a second battery, and you're comfortably covering two days.^[7]

Real Example: The Garcias in Temecula

The Garcias — a family of four in Southern California — dealt with 12 Public Safety Power Shutoff (PSPS) outages in 2025. Each lasted 6–14 hours.

They had a 9 kW solar system installed in 2023, but during the first outage, they lost power like everyone else. Afterward, they added two Tesla Powerwall 3s.

Cost: $32,000 before incentives. After the 30% federal tax credit ($9,600), their net cost was $22,400.

What it powers: refrigerator, kitchen lights, garage door, internet, three bedrooms, bathroom outlets, gas furnace fan.

Since installation: They've sailed through 7 outages without noticing. The batteries also time-shave their evening TOU rates (charging during super-off-peak, discharging during peak), saving roughly $80/month on their SDG&E bill.

Payback: Time-shaving alone recoups the net install cost in about 23 years, but the outage resilience has no price tag for them — it's peace of mind.

Three Things to Know Before You Buy

1. The Federal 30% Tax Credit Still Applies to Batteries

The Inflation Reduction Act's 30% Investment Tax Credit (ITC) covers standalone battery storage and battery-plus-solar installations through 2032, stepping down after that.^[8] Always confirm with a tax professional that you have sufficient tax liability to claim it.

2. Not Every Inverter Does Islanding

If you're adding batteries, make sure your inverter supports uninterruptible power supply (UPS) mode — switchover under 10 milliseconds. Most modern hybrid inverters (SolarEdge, Enphase, Franklin, Tesla) do. Older string inverters may not. Ask specifically: "Will my lights flicker or reboot during a grid drop?"

3. SGIP Rebates Are Still Available in California

The Self-Generation Incentive Program offers $150–$250 per kWh for battery storage, with enhanced rebates for low-income households and those in high-fire-threat districts.^[9] A 13.5 kWh battery could net $2,000+ off the top before the federal credit.

Bottom Line

Solar panels alone won't keep your lights on during an outage. That's not a solar problem — it's grid safety doing exactly what it should.

Solar plus a home battery is the answer most homeowners land on. It gives you seamless backup, lowers your daily electric bill, and qualifies for federal and state incentives that cut the cost by a third or more.

Not sure what's realistic for your home?

→ Start your free EnergyScout assessment to see your solar potential, battery sizing, and all available incentives at your ZIP code.

Related Articles

• Tesla Powerwall 3 vs Enphase IQ 5P: 2026 Comparison
• Home Battery Backup Cost in 2026 — Honest Breakdown
• Adding a Battery to Existing Solar Panels — Retrofit Guide