Sunprint
The short answer
A home battery keeps specific circuits running when the grid goes down, but "backup power" covers a wide range of actual outcomes. One battery unit comfortably runs a fridge, lights, a router and phone charging for about 10 to 12 hours. Try to run central air conditioning on it too, and that drops to roughly 3 to 4 hours. Anything more, a well pump, full central AC for a whole night, medical equipment, generally needs two or more units.
The 30 percent federal tax credit also ended for standalone batteries on December 31, 2025, the same date it ended for solar panels. A lot of pages and quotes haven't caught up to that yet.
What a battery costs in Florida
Pricing depends heavily on brand and how many units your loads require. A single unit in the Tesla Powerwall 3 or Enphase IQ Battery class adds roughly $10,000 to $15,000 to a system before incentives at the national level, but Florida installs commonly land anywhere in a $10,000 to $30,000 range once you account for brand and unit count.
| Setup | Installed cost | Notes |
|---|---|---|
| Single battery (13.5 kWh class) | $10,000–$15,000 added, before incentives | National base figure; Florida range runs $10,000–$30,000 by brand |
| Two-battery system | $18,000–$24,000 installed | What a well pump, central AC or medical equipment typically needs |
| Portable or standby generator | $10,000–$14,000 installed | Cheaper up front; see the comparison below |
No federal credit applies to any of these figures. The 30 percent residential credit ended for both solar panels and standalone batteries on December 31, 2025.
What it powers, and for how long
Runtime matters more than the kWh rating on a spec sheet. Here is what one battery unit realistically covers:
- Basic loads — a fridge, lights, a router, phone and device charging, and a few outlets — run about 10 to 12 hours on a single unit.
- Add central air conditioning to that same single unit, and runtime drops to roughly 3 to 4 hours. AC is by far the biggest draw in a Florida home.
- A well pump, full-night central AC, or medical equipment generally needs two or more battery units, which is the $18,000–$24,000 tier above.
None of this is fixed forever, though. Paired with solar, a battery recharges during daylight hours even while the grid is down, which changes the math entirely, see below.
Battery vs. generator
Neither option is universally better. It depends on what you're trying to solve:
| What you may hear | What is actually true |
|---|---|
| A generator runs as long as you have fuel. | True, and it's the main advantage over a battery. A battery's runtime is fixed by its charge unless paired with solar. |
| Generators turn on instantly. | Not quite. A portable unit needs a manual start. A standby unit auto-starts, but still takes 10 to 30 seconds to kick in. |
| A battery is the cheaper option. | Usually the opposite. A generator installs for about $10,000–$14,000, often less than even a single-battery system. |
| A battery needs fuel storage like a generator does. | No, and that's the battery's real advantage: silent operation, no fuel to store or run out of, and it recharges from solar if you have panels. |
Some installers, particularly on the Gulf Coast where outages tend to run longer, lean toward recommending a generator specifically for that unlimited-runtime advantage.
Why this keeps coming up
Outages have been getting longer, not shorter. Federal EIA data puts the average U.S. power outage at over 8 hours in 2023, up from about 3.5 hours a decade earlier. Florida ranks among the states with the longest average outage duration, which is a big part of why backup power comes up in almost every storm-season solar conversation.
Pairing a battery with solar
A battery on its own only has whatever charge it started an outage with. Paired with solar panels, it recharges during daylight hours even while the grid is still down, which can stretch usable backup indefinitely instead of running out after a fixed number of hours. Leaving the grid entirely is a bigger step; our guide to living off the grid in Florida covers the rules and how much more solar and storage it takes.
Some systems take this further. Tesla's Storm Watch feature automatically charges a Powerwall to full ahead of a forecasted severe weather alert in your area, so you start the outage at maximum reserve rather than whatever charge happened to be sitting in it. It's a useful example of how storm-aware charging works, whichever brand you end up choosing.
Permits and inspection
Florida requires an electrical permit and inspection for both battery and generator installations, under the Florida Building Code, which adopts the 2020 edition of the National Electrical Code (NFPA 70). A licensed installer handles this as part of a normal job, but it's worth confirming it's included in your quote rather than assumed.
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Common questions
How much does a home battery cost in Florida?
A single battery in the Powerwall 3 or Enphase IQ Battery class adds about $10,000 to $15,000 to a system before incentives nationally, but Florida installs commonly run $10,000 to $30,000 depending on the brand and how many units you need. A two-battery system, needed for a well pump, central air or medical equipment, typically runs $18,000 to $24,000 installed.
Is the federal tax credit still available for home batteries?
No. The 30 percent federal residential credit ended for standalone batteries on December 31, 2025, the same date it ended for solar panels. Several pages that rank for battery questions still haven't caught up to that, so a quote that subtracts the credit is out of date.
How long will a home battery power my house during an outage?
A single battery running basic loads, a fridge, lights, a router, phone charging and a few outlets, typically lasts about 10 to 12 hours. Add central air conditioning and that drops to roughly 3 to 4 hours. A well pump, central AC or medical equipment on a longer basis generally needs two or more battery units.
Should I get a battery or a generator in Florida?
It depends on what you're solving for. A battery is silent, needs no fuel, and recharges indefinitely if paired with solar, but a single unit runs down in hours on heavy loads. A generator costs less to install, about $10,000 to $14,000, and runs as long as it has fuel, but a portable unit needs a manual start and even a standby unit takes 10 to 30 seconds to kick in.
How long do Florida power outages typically last?
The average U.S. outage ran over 8 hours in 2023, up from about 3.5 hours a decade earlier, according to federal EIA data, and Florida ranks among the states with the longest average outage duration. That trend is a big part of why backup power gets asked about more than it used to.
What is Tesla Storm Watch?
Storm Watch is a feature on Tesla Powerwall that automatically charges the battery to full ahead of a forecasted severe weather alert in your area, so you start an outage with maximum reserve rather than whatever charge happened to be left.
Do I need a permit for a home battery or generator in Florida?
Yes. Florida requires an electrical permit and inspection for both battery and generator installations, under the Florida Building Code, which adopts the 2020 edition of the National Electrical Code (NFPA 70). A licensed installer handles this as part of the job, but confirm it's included in your quote.
Does pairing a battery with solar change how long it lasts?
Yes, substantially. A battery alone during an outage only has whatever charge it started with. Paired with solar panels, it recharges during daylight hours even while the grid is down, which can extend usable backup indefinitely rather than running out after a fixed number of hours.
Related guides
- Solar and homeowners insurance in Florida
- Florida solar incentives: what is still available
- Florida net metering explained
- Is solar worth it in Florida in 2026?
- How people pay for solar in Florida
- Solar panels and hurricanes in Florida
Sources: Aurora Solar, Palmetto, HVAC Base, Advance Solar, SunGrid Living, EnergyScout, Florida Power Services, The Generator Guys, InPhaze Electric, and U.S. Energy Information Administration outage data. Reviewed September 2026; confirm current pricing and specs with your installer.
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