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Solar + Battery vs. Solar Only in Florida

Does adding battery storage improve your solar ROI? Analysis of TOU arbitrage value, net metering export losses, and backup power economics.

Adding a 13.5 kWh battery to a solar system in Florida changes the economics in three ways: it enables time-of-use (TOU) arbitrage, reduces export losses under unfavorable net metering policies, and provides backup power during outages.

The solar system alone produces a 25-year NPV of $10,982. Whether a battery adds to this depends entirely on your utility's rate structure. Most utilities in Florida use flat rate structures, which limits TOU arbitrage value.

Battery Economics: Florida Power & Light (FPL)

$8,400
Battery Net Cost
$0
Daily Arbitrage
$0
Annual Value
-$11,382
25-Year Battery NPV

For Florida Power & Light (FPL) customers, battery storage has marginal economics with a 25-year NPV of -$11,382. The limited peak/off-peak spread means TOU arbitrage alone doesn't justify the cost. Backup power value and future grid services programs could improve the case.

Combined System Value

ConfigurationNet Cost25-Year NPV
Solar only (7 kW)$12,495$10,982
Battery only (13.5 kWh)$8,400-$11,382
Solar + Battery$20,895-$400

Frequently Asked Questions

Is solar + battery worth it in Florida?
With Florida's average utility rate of $14.2¢/kWh and solar irradiance of 1,450 kWh/kW/yr, the 25-year NPV for a 7 kW solar system is $10,982. Battery value depends on your utility's TOU rate structure.
What incentives are available for solar + battery in Florida?
The federal IRA provides a 30% ITC for solar and battery installations (through 2032) and up to $2,000 in 25C credits for heat pumps. Income-qualified households may receive additional point-of-sale rebates through the HOMES and HEAR programs.
How long does solar + battery take to pay back in Florida?
Solar panels in Florida pay back in approximately 9 years. Battery payback depends on TOU rate spreads. Heat pump payback ranges from 5-12 years depending on current fuel costs and local electricity rates.

Other Comparisons for Florida

Solar vs Grid›Heat Pump›Full Electrification›

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