Solar + Battery vs. Solar Only in Delaware
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 Delaware 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 $5,843. Whether a battery adds to this depends entirely on your utility's rate structure. Most utilities in Delaware use flat rate structures, which limits TOU arbitrage value.
Combined System Value
| Configuration | Net Cost | 25-Year NPV |
|---|---|---|
| Solar only (7 kW) | $13,720 | $5,843 |
Frequently Asked Questions
Is solar + battery worth it in Delaware?
With Delaware's average utility rate of $14.2¢/kWh and solar irradiance of 1,250 kWh/kW/yr, the 25-year NPV for a 7 kW solar system is $5,843. Battery value depends on your utility's TOU rate structure.
What incentives are available for solar + battery in Delaware?
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 Delaware?
Solar panels in Delaware 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.
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