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Solar + Battery vs. Solar Only in Hawaii

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 Hawaii 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 $68,203. Whether a battery adds to this depends entirely on your utility's rate structure. Hawaii has 1 major utility with TOU rates, creating real arbitrage opportunities.

Battery Economics: Hawaiian Electric (HECO)

$8,400
Battery Net Cost
$2
Daily Arbitrage
$898
Annual Value
$1,885
25-Year Battery NPV

For Hawaiian Electric (HECO) customers, adding a 13.5 kWh battery increases total system NPV by $1,885. The battery generates $898/year in TOU arbitrage by storing solar during off-peak ($25.0¢/kWh) and discharging during peak ($52.0¢/kWh).

Combined System Value

ConfigurationNet Cost25-Year NPV
Solar only (7 kW)$10,680$68,203
Battery only (13.5 kWh)$8,400$1,885
Solar + Battery$19,080$70,088

Frequently Asked Questions

Is solar + battery worth it in Hawaii?
With Hawaii's average utility rate of $39.8¢/kWh and solar irradiance of 1,600 kWh/kW/yr, the 25-year NPV for a 7 kW solar system is $68,203. Battery value depends on your utility's TOU rate structure.
What incentives are available for solar + battery in Hawaii?
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. Hawaii also offers a state credit worth up to $5,000. 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 Hawaii?
Solar panels in Hawaii pay back in approximately 3 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 Hawaii

Solar vs Grid›Heat Pump›Full Electrification›

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