Do EV Owners Need a Standby Generator? Here's the Case For One

Gas car owners have a simple backup plan during a power outage: drive to a gas station. EV owners don't have that option if the grid — and every charger tied to it — is down. That single difference is why standby generators come up so often in EV ownership conversations, even for people who never thought about backup power before buying an electric vehicle.

Here's the case for pairing an EV with a standby generator, and what to think through before you buy one.

The Core Problem: Your "Gas Station" Is Also Down

When the power goes out, a gas station's pumps typically don't work either — but the station itself isn't your only option, and most outages are local or regional, so a functioning station is usually a short drive away.

An EV's fallback is narrower. If your home charger is down because the grid is down, your options are:

• Drive to a public charging station outside the outage area — which may be a longer trip than a gas station detour, and may have a line of other EV owners with the same idea
• Wait for the power to come back
• Already have a generator ready to go

For daily commuters, single-EV households, or anyone in an area prone to extended outages (storms, wildfire-related shutoffs, grid strain during heat waves), "wait it out" isn't always a workable plan.

Outages Are Getting More Common, Not Less

Extreme weather events — hurricanes, ice storms, heat-driven grid strain, and utility-initiated public safety power shutoffs in wildfire-prone regions — have made multi-day outages more frequent in large parts of the country. A multi-day outage is a minor inconvenience for a gas car owner with a full tank. For an EV owner who was already at 20% range when the lights went out, it's a much bigger problem.

What a Generator Actually Needs to Cover

This is where EV ownership changes the math on generator sizing compared to a typical household.

• Level 1 charging (a standard 120V outlet) draws relatively little power and can be handled by even a modest portable generator — but it's slow, often adding only 3–5 miles of range per hour.
• Level 2 charging (a 240V home charger) is what most EV owners actually use, and it typically draws 30–50 amps at 240V — roughly 7 to 11 kW on its own, before you add anything else in the house.

That means a generator sized only for "the basics" — a fridge, some lights, a sump pump — often isn't big enough to also run Level 2 EV charging at the same time. If home charging is part of your outage plan, you're generally looking at a larger standby unit than a non-EV household would need, especially if you want to charge and keep the rest of the house running simultaneously.

Standby vs. Portable: Why Standby Makes More Sense Here

A portable generator can technically charge an EV, but it comes with real trade-offs for this specific use case:

• Manual setup during a storm or outage, when you may not want to be outside running cords
• Fuel supply limits — portables typically run on gasoline, which is exactly the resource that gets scarce and hard to find during a widespread outage
• Lower capacity, making it harder to run Level 2 charging alongside essential house loads

A standby generator, permanently installed and typically running on natural gas or propane, starts automatically when the power drops, doesn't depend on you having gas cans on hand, and can be sized specifically to cover EV charging plus your home's essential circuits at the same time.

Who This Matters Most For

A standby generator isn't a universal requirement for every EV owner. It matters most if:

• You rely on the EV as your only vehicle, or your only reliable one
• You live somewhere with frequent storms, wildfire-related outages, or grid strain
• You don't have easy access to a public charger outside a typical outage radius
• You want the house and the car both covered without relying on a public charging queue during an emergency

It matters less if you have a second gas vehicle as a fallback, charge primarily at work or a public station rather than at home, or live somewhere outages are rare and typically brief.

One More Option Worth Knowing About

Some newer EVs support bidirectional charging (V2H — vehicle-to-home), which lets the car's own battery power the house during an outage instead of the other way around. If your EV supports it, that can reduce or even replace the need for a standby generator. For most EVs on the road today, though, that capability isn't standard, which keeps a standby generator the more broadly applicable solution.

Sizing and Buying at ACUnitsForLess

If you're weighing a standby generator for EV charging, sizing is the detail that matters most — undersized units either can't run charging alongside your other loads or force you to choose between the two during an outage. ACUnitsForLess carries residential standby generators built to handle home charging loads alongside everyday essentials, with options sized for single-EV households up through larger homes running multiple high-draw circuits at once.

Call us at 678-535-7176 to talk through your home's electrical setup, charger amperage, and the right generator size for your situation.

FAQ

Can a standard portable generator charge my EV? Yes, but usually only at Level 1 speeds unless it's a larger unit, and you'll need to manage fuel and setup manually during the outage.

How big a generator do I need to charge an EV at home? Level 2 home charging alone typically draws 7–11 kW. You'll want a generator sized to cover that plus your home's essential circuits — often larger than what a non-EV household would need.

Is a standby generator worth it if I have a second gas car? It's less urgent in that case, since you have a fallback option during an outage. It still adds convenience and whole-home backup, but it's more of a nice-to-have than a necessity.

Do any EVs power the house instead of needing a generator? Some newer EVs support vehicle-to-home (V2H) bidirectional charging, letting the car supply the house during an outage. This isn't standard on most EVs yet, so a standby generator remains the more universal solution.

Where can I get help sizing a generator for EV charging? Contact ACUnitsForLess — we can help match a standby generator to your charger's amperage and your home's total essential load.