Charging an Electric Car When the Power Is Out

You cannot charge an electric car from a standard home outlet during a power outage

When the grid goes down, your home charger stops working because it draws power from your house electrical system. A Level 1 charger (the standard 120-volt outlet) and a Level 2 charger (the 240-volt unit most homes have installed) both require grid power to operate. If your home has no electricity, neither will charge your car.

The only exception is if you have a home battery system — like a Tesla Powerwall or similar product — that stores power independently. Even then, you need to have installed and configured that system before the outage happens. You cannot buy or install one once the power is already out.

This matters most in South Carolina because hurricanes and severe storms can knock out power for days or weeks. If you own an electric vehicle, you need a plan before that happens, not during.

Key Takeaways

• Standard home chargers require grid power and will not work during an outage, even if your car has battery charge remaining.
• Public charging stations may still operate if they have backup power, but many do not — call ahead or check the station's website before driving there.
• A home battery system can charge your car during an outage, but it must be installed and charged before the power fails.
• If you are stranded with a low battery during an outage, your best option is to drive to a public charger in an area with power, or wait for the grid to restore.
• Plan your outage strategy now: know which public chargers near you have backup power, and keep your car charged above 50 percent during storm season.

Public charging stations during a power outage

Some public chargers will work during an outage if they have backup generators or battery storage, but most do not. Chargers at shopping centers, workplaces, and municipal parking lots typically rely on the grid and will be offline when power fails.

Chargers at hospitals, fire stations, emergency shelters, and some utility company facilities are more likely to have backup power, but this varies widely. The only way to know is to contact the station owner or operator before an outage happens. Call the number on the charger's app or website and ask directly: "Does this location have backup power during an outage?"

If you are caught in an outage with low battery, your options are to drive to an area where power is still on, or to stay put and wait for the grid to restore. Do not assume any charger is working — call first or check the charger's app if it shows real-time status.

Home battery systems that can charge your car

A home battery — most commonly a Tesla Powerwall, but also products like the LG Chem RESU or Generac PWRcell — stores electricity independently from the grid. If your battery is fully charged before an outage, it can power your home and charge your car through your existing Level 2 charger.

The catch is that a home battery system is expensive (typically $10,000 to $15,000 installed, before any incentives) and must be installed before the outage. You also need to keep it charged during normal times, which means running it continuously or charging it from solar panels. Most homeowners use home batteries with solar installations to make the cost worthwhile.

If you are considering a home battery, talk to a solar installer or electrician about whether it makes sense for your situation. They can tell you how much battery capacity you would need to charge your car during a multi-day outage, and what that would cost.

Preparing your electric car for storm season

The simplest preparation is to keep your car charged above 50 percent during hurricane season (June through November). A higher charge gives you more range to drive to a working charger or to evacuate if needed.

Before storm season, identify public chargers near you that are likely to have backup power — hospitals, emergency facilities, or chargers owned by the utility company. Write down their addresses and phone numbers, or save them in your phone. If an outage happens, you will know where to go.

If you have a long commute or frequently drive far from home, consider whether you need a second vehicle with a gas engine during outage season. An electric car with 200 miles of range is useful for daily driving but risky if you cannot charge it for a week.

What to do if you are stranded with a low battery

If the power goes out and your car is nearly empty, your first step is to check whether any chargers in your area still have power. Use your car's navigation system or a charger app (like PlugShare or ChargePoint) to find nearby stations, then call them to confirm they are working.

If chargers near you are all offline, you have two options: drive to an area where power is still on (if you have enough range), or stay put and wait for the grid to restore. Do not drive aimlessly looking for a charger — that will drain your battery faster.

If you need to evacuate during an outage and your car is low on charge, contact local emergency management or your utility company. Some areas set up charging stations at shelters or emergency facilities during major outages. Your utility company's website or emergency hotline will have that information.

How solar panels and batteries work together

If you have solar panels on your roof, they generate power during the day even if the grid is down — but only if your system is designed to do so. Most grid-tied solar systems shut down automatically during an outage for safety reasons. To charge your car from solar during an outage, you need a battery system and an inverter configured to work without the grid.

This setup is called a "hybrid" or "off-grid capable" solar system. It is more expensive than a standard grid-tied system, but it lets you generate and store your own power. If you are interested, ask a solar installer whether your roof gets enough sun to charge both your home and your car during an outage.

Frequently Asked Questions

Can I use a gas-powered generator to charge my electric car?

No. Generators produce AC power, but they are not designed to output the high voltage and amperage that car chargers need. Plugging a charger into a generator can damage both the generator and the car. Some newer portable power stations (like the Jackery or EcoFlow models) can charge a car, but they are expensive and have limited capacity — they might add 10 to 20 miles of range before running out.

Will my car's battery drain if I leave it parked during a power outage?

Modern electric cars lose charge very slowly when parked — typically 1 to 3 percent per week. During a week-long outage, you might lose 5 to 15 percent of your battery. This is not fast enough to strand you, but it is another reason to start an outage with a full or near-full charge.

Can I charge my car from another car's battery?

Not in any practical way. Car-to-car charging (called V2L or vehicle-to-load) exists on some newer electric vehicles, but it provides only a small amount of power — enough to charge a phone or laptop, not a car. You cannot use one electric car to charge another.

What if my workplace has a charger — can I charge there during an outage?

Only if that charger has backup power. Most workplace chargers do not. Before an outage happens, ask your employer or facilities manager whether the charger has a generator or battery backup. If it does, you know where to go if you need to charge during an outage.

Should I buy an electric car if I live in an area with frequent outages?

That depends on your driving patterns and your ability to charge elsewhere. If you have a short commute and can charge at work or at a public station with backup power, an electric car is workable. If you drive long distances and rely only on home charging, frequent outages make ownership riskier. Talk to other electric car owners in your area about how they handle outages — they can tell you what actually works in your community.