Short answer: most portable gas generators are rated to run continuously for 8–12 hours per tank, but for apartment renters, the real answer is usually “you shouldn’t be running a gas generator at all.” Here’s why, and what actually works instead.
How Long Can a Generator Run Continuously?
For homeowners with safe outdoor space, here’s the real runtime guidance:
- Continuous runtime: Most consumer portable generators (2,000–7,500 watts) run 8–12 hours per tank at 50% load. Full load cuts that significantly, sometimes to 4–6 hours.
- Never run it dry repeatedly: Refuel only after it’s shut off and cooled, never while running or hot.
- Install a CO detector regardless: Even with “safe” placement, a battery-powered carbon monoxide detector near the generator’s location is non-negotiable.
Why Gas Generators and Apartments Don’t Mix
Gas-powered generators produce carbon monoxide, and they need to run outdoors, away from windows and air intakes, with several feet of clearance on all sides. In an apartment, that almost never exists safely:
- Balconies are typically too close to your own windows and your neighbors’ units
- Most lease agreements explicitly prohibit fuel-powered generators on the property
- Shared hallways and stairwells mean carbon monoxide can travel to other units, not just yours
If you’ve ever wondered why generator-related carbon monoxide deaths spike during major outages, this is exactly why — people run them in attached garages, breezeways, and balconies that feel “outdoors enough” but aren’t.
The Apartment-Safe Alternative: Portable Power Stations
This is where apartment renters actually have an advantage over homeowners: a battery-based portable power station produces zero emissions, can run safely indoors, and needs no fuel storage. The tradeoff is runtime and wattage — you’re not running a window AC unit for 10 hours, but you can absolutely keep a fridge, phone chargers, a few lights, and a fan running through most outages.
Runtime comparison for a typical outage scenario (fridge + lights + phone charging):
- Jackery Explorer 300 Plus (288Wh) — roughly 4–5 hours on a fridge alone, longer with lighter loads. Best for short outages and the most budget-friendly option.
- EcoFlow River 2 Pro (768Wh) — can run a fridge most of a full day, recharges in under 70 minutes once power returns.
- Anker SOLIX C1000 Gen 2 (1,024Wh) — full day of mixed use, full recharge in 49 minutes, the strongest option for back-to-back outages.
Pair any of these with the BLUETTI 350W Solar Panel if your outages tend to run multiple days — it extends runtime indefinitely as long as there’s daylight, with zero fuel and zero indoor air-quality risk.
Not sure which size you actually need? Our Generator Size Finder asks 4 quick questions about what you need powered and gives you a direct recommendation.
Frequently Asked Questions
How long should you run a generator during a power outage?
A typical portable gas generator can run 8–12 hours continuously on a full tank at moderate load, but it should never run unattended overnight without a working carbon monoxide detector nearby, and never in an enclosed or semi-enclosed space like a balcony or breezeway.
Can you run a generator on an apartment balcony?
No. Even an open-air balcony is typically too close to windows, vents, and neighboring units for safe generator exhaust. Most apartment leases also explicitly prohibit fuel-powered generators on the property for this reason.
How long does a portable power station last during a power outage?
It depends on the battery size and what you’re running. A 300Wh unit can typically run a fridge for 4–5 hours, while a 1,000Wh+ unit can cover a full day of mixed use including lights, phone charging, and a fridge.
How Long Will You Actually Need It?
This depends entirely on your area’s typical outage length, which varies a lot by region and grid age. If you don’t know your real number, find out: our free Power Outage Cost Calculator factors in how often outages hit your area and what they cost when they do.