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Solar + Battery vs. Solar Only in North Carolina

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 North Carolina 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 $4,876. Whether a battery adds to this depends entirely on your utility's rate structure. North Carolina has 1 major utility with TOU rates, creating real arbitrage opportunities.

Battery Economics: Duke Energy Carolinas

$8,400
Battery Net Cost
$1
Daily Arbitrage
$319
Annual Value
-$6,665
25-Year Battery NPV

For Duke Energy Carolinas customers, battery storage has marginal economics with a 25-year NPV of -$6,665. 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)$13,132$4,876
Battery only (13.5 kWh)$8,400-$6,665
Solar + Battery$21,532-$1,789

Frequently Asked Questions

Is solar + battery worth it in North Carolina?
With North Carolina's average utility rate of $12.2¢/kWh and solar irradiance of 1,350 kWh/kW/yr, the 25-year NPV for a 7 kW solar system is $4,876. Battery value depends on your utility's TOU rate structure.
What incentives are available for solar + battery in North Carolina?
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 North Carolina?
Solar panels in North Carolina pay back in approximately 11 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 North Carolina

Solar vs Grid›Heat Pump›Full Electrification›

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