Generator vs. solar battery: which is better in Florida?

Generator figures are HomeAdvisor's 2026 national ranges; battery cost is EnergySage's October 2026 figure for Miami Beach.

Generac lists its 22 kW Guardian generator at about 204 cubic feet of natural gas an hour at half load and 327 at full load, or about 2.5 to 3.9 gallons of propane an hour. It also calls for a cool-down every 24 hours of continuous use.

Natural gas isn't an option for most Florida homes: EIA counted about 946,000 residential natural gas customers in Florida in 2024. Most generator owners run on a propane tank, which has to be filled before the storm and lasts only so many days.

Portable generators are the main cause of carbon monoxide poisoning after Florida hurricanes. After Hurricane Isaias in October 2026, authorities in Escambia County said a man was found dead in a closed garage with a generator running. After Hurricane Irma in 2017, Florida recorded 529 carbon monoxide poisoning cases and 15 deaths, and 97.5% were tied to generator use. A CDC study of the 2004 Florida hurricanes found portable generators behind nearly every case with a known source, and every death.

Permanent standby generators are safer because they're installed outdoors to code. Miami-Dade, for example, requires a building permit for a permanent generator and puts the exhaust at least 10 feet from doors, windows and other openings. A battery has no exhaust at all.

For permanent equipment, yes. Counties and cities issue the permits: Miami-Dade requires one for any permanently placed generator, though not for a portable unit plugged directly into a few appliances. Home batteries are permitted with the solar system, and since July 2025 a private provider can review residential solar and battery plans, with a decision due within 5 business days.

A 2026 bill (SB 968) that would have exempted home backup power systems from some permit rules died in committee, so local permits still apply.

Yes, with the right switch. Tesla says Powerwall can work with a backup generator through a separate automatic or manual transfer switch, but the two aren't directly integrated, so Powerwall doesn't charge from the generator; the generator starts when the battery runs low or the home needs more power than Powerwall supplies. Generac's PWRcell 2 system lists standby generator integration through its own disconnect switch.

Together, the battery covers short outages and nights silently, and the generator covers long cloudy stretches.

Not if your request meets its rules. A 2024 Florida law (HB 293) lists exterior fixed generators and fuel storage tanks as hurricane protection, requires HOAs to adopt specifications for them, and bars denying an application that meets those specifications. The HOA can still set details such as placement and appearance, and you still need a local permit. For batteries and solar, see Florida HOA solar rules.

Generac's spec sheet lists its 22 kW Guardian at about 67 dB(A) at 23 feet under normal load. Generac recommends an oil and filter change every 200 hours or every two years, whichever comes first, and more often in extreme heat. Two hundred hours is about eight days of nonstop running, so a long post-storm outage can call for service mid-outage.

On propane, a 500-gallon tank holds about 400 usable gallons, and propane supplier Ferrellgas says a tank that powers only the generator can last five to six days.

• A solar battery fits if you want quiet, fuel-free backup for essentials, are adding solar anyway, and can size the battery for the AC you want to run.
• A standby generator fits if you want to run the whole home for a week or more regardless of clouds, and you have natural gas or room for a propane tank.
• Both suits homes that want to run everything: the battery covers short outages and nights silently, and the generator covers long cloudy stretches.

Either way, a battery won't pay for itself on your electric bill in Florida, because net metering already credits exported solar at the full rate. See solar battery backup for hurricanes for sizing.