Solar Panels in Charleston, South Carolina

Q: How much do solar panels cost in Charleston, South Carolina?

A typical 8 kW system in Charleston costs approximately $22,400 installed (2026 average: ~$2.80/W). The federal solar tax credit (Section 25D) expired December 31, 2025 and is no longer available for residential buyers. Your net cost is $22,344 after the South Carolina state credit.

Q: Is solar worth it in Charleston without the federal tax credit?

Charleston produces 1468.3 kWh/kWp/year. An 8 kW system saves $1,629/year and pays back in 10.3 years — even without the expired federal credit. Solar is ok worth it in Charleston.

Q: How long is the solar payback period in Charleston?

The payback period in Charleston is approximately 10.3 years, based on 1468.3 kWh/kWp annual yield (PVGIS v5.3) and a 15.41¢/kWh electricity rate (EIA data, updated April 11, 2026).

Charleston receives 1468.3 kWh per kWp of solar panels per year — 4.9% above the US national average of 1,550 kWh/kWp. At South Carolina's electricity rate of 15.41¢/kWh, an 8 kW system saves roughly $1,629/year and pays back in 10.3 years.

Solar is ok worth it in Charleston. Note: The 30% federal solar tax credit (Section 25D) expired December 31, 2025. The numbers below reflect today's actual costs.

Annual yield:1468.3 kWh/kWp

Electricity rate:15.41¢/kWh

Payback:10.3 yrs

Location:32.78°N

Charleston Solar at a Glance

Annual solar yield1468.3 kWh/kWp/yr

Optimal tilt angle32° south-facing

Avg. daily sun hours3.2 hrs/day

Electricity rate15.41¢ per kWh

8 kW system cost (2026)$22,400

South Carolina state credit− $56

Your net cost$22,344

Annual savings$1,629/yr

Payback period10.3 years

Last updated: April 11, 2026 · Sources: PVGIS v5.3, EIA

How Much Solar Power Does Charleston Get Each Month?

Monthly solar yield (kWh per kWp installed) based on PVGIS satellite data for 32.78°N, 79.93°W.

110

136

142

138

125

128

121

119

125

111

102

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Best month: 142.3 kWh/kWp (Apr)Worst month: 101.9 kWh/kWp (Dec)Monthly avg: 122 kWh/kWp

Live Solar Forecast for Charleston

Real-time generation estimate for an 8 kW system based on today's weather forecast. Data: forecast.solar.

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Is a Home Battery Worth It in Charleston?

A battery stores excess midday solar for use at peak evening hours. At 15.41¢/kWh in Charleston, here is the math for the two most popular options.

Tesla Powerwall 3

Capacity

13.5 kWh

Installed cost

$11,500

Annual savings

$607

Payback

18.9 yrs

10-year value: $6,070 · Based on 365 cycles/yr, 15.41¢/kWh, 80% usable capacity. Does not include backup value or utility TOU rate savings.

Generic LFP 10 kWh

Capacity

10 kWh

Installed cost

$8,000

Annual savings

$431

Payback

18.6 yrs

10-year value: $4,310 · Based on 350 cycles/yr, 15.41¢/kWh, 80% usable capacity. Does not include backup value or utility TOU rate savings.

Battery ROI improves significantly in states with Time-of-Use (TOU) rates where peak electricity can cost 2–3× the off-peak rate. California (PG&E, SCE, SDG&E), New York (ConEd), and Massachusetts (Eversource) have the strongest TOU incentives for battery storage.

What Are the 25-Year Solar Savings in Charleston?

Based on 1468.3 kWh/kWp/yr yield, 15.41¢/kWh electricity rate, and a 2026 system cost of $2.80/W. Federal tax credit expired Dec 31, 2025 — not included.

System cost

$22,400

Installed, 8 kW

State credit

−$56

South Carolina only

Net investment

$22,344

Your actual cost

25-yr savings

$38,689

Est. lifetime benefit

Federal Solar Tax Credit Update: The 30% residential solar tax credit (Section 25D) expired on December 31, 2025 under the One Big Beautiful Bill. Cash and loan purchases no longer qualify for the federal credit. State and local incentives below may still apply — check with your installer.

What Solar Incentives Are Available in Charleston, South Carolina?

The federal ITC expired in 2025. These state and utility incentives still apply in South Carolina.

South Carolina State Tax Credit

0% of cost back on your state income taxes.

Property Tax Exemption

South Carolina exempts the solar-added home value from property taxes. A $22,400 system won't raise your tax bill.

Net Metering

Earn bill credits for excess solar electricity sent back to the grid.

Utility & Local Programs

25% state tax credit (up to $3,500), Duke Energy/Dominion net metering, property tax exempt

See all South Carolina incentives Solar learning guides

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Solar Panels in Charleston: Frequently Asked Questions

How much do solar panels cost in Charleston, South Carolina in 2026?

In Charleston, a typical 8 kW solar system costs approximately $22,400 installed (at ~$2.80/W, the 2026 US average). The federal solar tax credit expired December 31, 2025, so that 30% rebate is no longer available for residential cash or loan purchases. South Carolina's state tax credit saves an additional $56, bringing your net cost to $22,344. Prices vary by installer, panel brand, and roof complexity.

Is solar worth it in Charleston without the federal tax credit?

Charleston generates 1468.3 kWh per kWp annually — 4.9% above the US average. At South Carolina's electricity rate of 15.41¢/kWh, an 8 kW system saves roughly $1,629/year and pays back in about 10.3 years — even without the expired federal credit. Solar is ok worth it in Charleston.

How much electricity do solar panels produce in Charleston?

In Charleston, each kW of solar panels produces approximately 1468.3 kWh per year. An 8 kW system generates about 11,746.4 kWh annually — enough to cover the average South Carolina household's electricity use. Peak production hits 142.3 kWh/kWp in Apr, with the lowest output of 101.9 kWh/kWp in Dec. Data source: PVGIS v5.3 satellite radiation model.

What solar incentives are available in Charleston, South Carolina?

the expired federal tax credit (Section 25D) expired December 31, 2025 and is no longer available for residential buyers. South Carolina still offers a state tax credit of 0% (up to $56). South Carolina also exempts solar systems from property tax assessments. Net metering and local utility programs may provide additional savings.

How long is the solar payback period in Charleston?

In Charleston, the average payback period for an 8 kW solar system is approximately 10.3 years. This is based on 1468.3 kWh/kWp annual yield (PVGIS data), a 15.41¢/kWh electricity rate (EIA 2026 data), and an $22,400 installed cost. After payback, the system produces free electricity for 15–20 more years.

Environmental Impact & Home Value in Charleston

An 8 kW solar system in Charleston produces roughly 11,746.4 kWh/year. Here is what that means beyond your electricity bill.

🌿

CO₂ avoided per year

4.5 tonnes

4,534 kg · EPA grid avg 0.386 kg/kWh

🌳

Tree equivalent

208 trees

Trees needed to absorb same CO₂ annually

🏠

Home value boost

+$1,546

Avg +6.9% (Lawrence Berkeley Lab / Zillow data)

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US homes powered

Avg US home uses 10,632 kWh/yr (EIA 2024)

How Many Solar Panels Do You Need in Charleston?

The right system size depends on your annual electricity usage and how much of your bill you want to offset. In Charleston, where annual solar yield is 1468.3 kWh per kWp, here is what different households typically need:

Annual usage	System size	Panels (400 W)	Est. cost	Annual savings
6,000 kWh Small home	4.1 kW	11 panels	$11,480	$925/yr
10,800 kWh Average home	7.4 kW	19 panels	$20,720	$1,664/yr
15,000 kWh Large home	10.3 kW	26 panels	$28,840	$2,312/yr
20,000 kWh Large + EV	13.7 kW	35 panels	$38,360	$3,082/yr

Costs based on $2.80/W installed (2026 US average). Panel count assumes 400 W modules. Savings based on current 15.41¢/kWh rate. State incentives not included — see above for South Carolina credits.

CharlestonSolar Resources & 2026 Incentives

Key information for homeowners in Charleston going solar in 2026 — after the federal 30% tax credit expired December 31, 2025.

⚡ Federal Tax Credit Status (2026)

The 30% Section 25D residential solar credit expired December 31, 2025. An 8 kW system in Charleston costs $22,344 after a $56 South Carolina state credit. The commercial Section 48 credit (for businesses, landlords) was not affected.

IRS Residential Clean Energy Credit →

🔌 Net Metering in South Carolina

South Carolina has a net metering policy. Contact your local utility for current export rates.

DSIRE — South Carolina Incentive Database →

🏛️ South Carolina State Incentives

25% state tax credit (up to $3,500), Duke Energy/Dominion net metering, property tax exempt

✓ Property tax exempt

📚 Authoritative Sources