A worked example: 8 kW in South Carolina
An 8 kW system — about 19 × 425-watt panels — at South Carolina's assumed installed cost of $2.40–$3.15 per watt runs roughly $19,200–$25,200 before incentives. At about 1,400 kWh of production per installed kW, it would generate around 11,200 kWh per year. Valuing self-consumed electricity at the assumed $0.14/kWh retail rate and exports conservatively, first-year savings land near $1,292 — a simple payback of roughly 15–20 years.
There is no federal tax credit in that math: the Section 25D residential credit ended for systems installed after December 31, 2025. State or utility incentives, where they exist, would shorten payback from here.
Average cost of solar panels in South Carolina by system size
Most South Carolina quotes land between 6 and 12 kW. At the state's assumed $2.40–$3.15 per watt, here is what each size costs to install, what it produces, and how long it takes to pay for itself on electricity savings alone — no incentives applied.
| System size | Panels | Installed cost | Annual production | Est. payback |
|---|---|---|---|---|
| 6 kW | 15 | $14,400–$18,900 | 8,400 kWh | 15–20 yrs |
| 8 kW | 19 | $19,200–$25,200 | 11,200 kWh | 15–20 yrs |
| 10 kW | 24 | $24,000–$31,500 | 14,000 kWh | 15–20 yrs |
| 12 kW | 29 | $28,800–$37,800 | 16,800 kWh | 15–20 yrs |
Size should follow your electricity usage, not a round number — these are reference points, not a recommendation. Note that cost per watt rises on smaller systems, because permitting, labor and the inverter do not shrink with the array.
What solar costs per kWh in South Carolina
Spread across a 25-year life, with 0.5%/yr panel degradation and no financing cost, solar electricity in South Carolina works out to roughly 7.3¢–9.6¢ per kilowatt-hour. The South Carolina retail rate this page assumes is 14.0¢. That gap — not the sticker price — is what determines whether solar pays here, and it is why a sunnier state with cheap electricity can be a worse investment than a cloudier one with expensive electricity. See how every state compares on cost per kWh.
Net metering and export rates in South Carolina
South Carolina’s "solar choice" tariffs replaced legacy net metering: exports are credited below retail with time-of-use elements at Duke and Dominion.
Export rules are worth reading as an incentive, because they set what every kilowatt-hour you do not use on site is worth — see how South Carolina compares with every other state on net metering.
South Carolina solar incentives
South Carolina offers a 25% state income tax credit (capped per year at $3,500 or 50% of liability, carrying forward up to 10 years) — one of the largest state credits.
The most valuable program is 25% state tax credit. With no federal credit for 2026 installs, state and utility programs are now the whole picture — see the full South Carolina incentives guide.
Solar costs in South Carolina cities
Statewide averages blend climates, utilities and installer markets that differ within South Carolina. These city guides use local production factors and name the specific utility serving the area.
What changes a South Carolina solar quote?
Equipment, roof condition, electrical upgrades, permitting, labor, system size, batteries and financing can all change the installed price. Savings also depend on the specific utility rate, how much solar electricity the home uses directly, and what the utility pays for exports.
Frequently asked questions
What is the average cost of solar panels in South Carolina?
The average installed cost in South Carolina runs $2.40–$3.15 per watt before incentives, which puts a 6 kW system at $14,400–$18,900, an 8 kW at $19,200–$25,200, and a 10 kW at $24,000–$31,500. Spread over a 25-year life, that works out to about 7.3¢–9.6¢ per kilowatt-hour, against a South Carolina retail rate assumed at 14.0¢.
How much does it cost to install solar panels in South Carolina?
Installation is not priced separately — the $2.40–$3.15 per watt above is a turnkey figure covering panels, inverter, racking, labor, permitting and interconnection. What moves it most in SC is roof complexity, whether the main panel needs upgrading, and whether a battery is included. Expect a site visit to change any online estimate, including this one.
How much do solar panels cost in South Carolina?
Using an assumed installed cost of $2.40–$3.15 per watt, a typical 8 kW home system in South Carolina costs roughly $19,200–$25,200 before incentives. Smaller and larger systems scale roughly with size, though small systems cost more per watt.
Is solar worth it in South Carolina?
With South Carolina electricity around $0.14/kWh and production around 1,400 kWh per installed kW per year, an 8 kW system could save roughly $1,292 in year one, for a simple payback of about 15–20 years with no federal credit. Whether that is "worth it" depends on your rate plan, export compensation, roof, and how long you plan to stay in the home.
How many solar panels do I need in South Carolina?
It depends on your electricity usage, not your roof. At South Carolina's assumed 1,400 kWh per installed kW, a 6 kW system (about 15 panels at 425 watts) generates roughly 8,400 kWh a year, and a 10 kW system (about 24 panels) roughly 14,000 kWh. Compare that against your annual kWh from a utility bill — our calculator sizes it from your monthly bill in about a minute.
Does South Carolina have net metering?
South Carolina’s "solar choice" tariffs replaced legacy net metering: exports are credited below retail with time-of-use elements at Duke and Dominion.
What solar incentives does South Carolina offer in 2026?
South Carolina offers a 25% state income tax credit (capped per year at $3,500 or 50% of liability, carrying forward up to 10 years) — one of the largest state credits. Note that the federal Section 25D residential credit ended for systems installed after December 31, 2025, so state, local and utility programs are now the main incentives for purchased systems.
Is there still a federal solar tax credit in South Carolina?
No — the 30% federal residential clean energy credit (Section 25D) ended for systems installed after December 31, 2025 under the One Big Beautiful Bill Act. Leased or PPA systems may still benefit indirectly because the system owner can claim the commercial 48E credit through 2027.
Use this as a starting point
This page provides broad state assumptions, not a current market survey or binding quote. Before purchasing, verify applicable incentives, utility rules, installer licensing, warranties and financing terms.
Where these numbers come from
State assumptions are informed by public data and reviewed periodically (September 2026):