Solar calculator for Delaware
Panels, system size, cost and payback for Delaware, from your own power bill.
The average Delaware home uses 911 kWh a month and pays 16.6 cents per kWh, which puts Delaware at mid-range electricity prices, so payback depends mostly on how much sun your roof gets. Delaware has both a heating and a cooling season, so the bill swings both ways and a full year of bills gives a better answer than one month. A south-facing fixed array there makes about 1,364 kWh per installed kW a year, and the worst winter month still gets 2.69 peak sun hours a day. Drop in your own bill below and the numbers on this page are replaced by yours.
A worked example for Delaware
Take the average home: 911 kWh a month, which is 10,932 kWh a year, at 16.6 cents per kWh (EIA, 2024 residential averages, as of 2026-11). Sized to cover all of that use, the tool returns 8.0 kWdc and 20 panels, needing about 420 square feet of roof. The installed estimate is $19,957 (national median, EnergySage H2 2025), yearly savings are about $1,815, and simple payback is 11.0 years, with no incentive applied.
Sun and yield in Delaware
We use 1,364 kWh per installed kW per year for Delaware, from NREL PVWatts v8 for the state's largest city at a 20 degree south-facing tilt (via TheGreenWatt, as of 2026-11). The darkest month averages 2.69 peak sun hours a day, which matters if you plan to go off-grid or size a battery. A different roof angle or heavy shade changes this, so treat it as a starting point.
Incentives
The 30% federal tax credit ended for homeowner purchases after December 31, 2025, so none is applied here. See the tax credit guide. Look up Delaware and your own utility for net metering terms and any local programs before relying on a payback number.
Planning estimate. Permits, interconnection approval and a licensed electrician are required for grid-tied systems.
Questions
How many solar panels does a Delaware home need?
The average Delaware home uses 10,932 kWh a year (EIA 2024). At about 1,364 kWh per installed kW, covering all of it takes 8.0 kWdc, or 20 panels. Your own bill will move that up or down.
How much does solar cost in Delaware?
For the average-home example the installed estimate is $19,957 at the national median of $2.49 per watt (EnergySage, H2 2025, as of 2026-11). We have no sourced Delaware price multiplier, so local quotes will differ.
Is there a federal solar tax credit in Delaware?
The 30% federal tax credit ended for homeowner purchases after December 31, 2025. Check your state, utility and local programs separately.
Where does the Delaware sun figure come from?
1,364 kWh per kW per year and 2.69 winter peak sun hours come from NREL PVWatts v8 runs for Delaware's largest city, compiled by TheGreenWatt (as of 2026-11). Real yield varies across the state.
Is my bill uploaded?
No. Your bill is read in your browser and never uploaded.