Installed home solar in South Carolina commonly runs about $2.50 to $3.00 per watt before incentives, so a 7 kW system costs roughly $17,500 to $21,000 (confirm with local quotes). At the state’s 16.18 cents per kWh power rate, simple payback usually lands near 11 to 14 years. The federal 25D homeowner credit ended December 31, 2025.
South Carolina homeowners pay about 16.18 cents per kWh for electricity (EIA retail sales, residential SC, as of May 2026), a middle-of-the-pack rate, so the money question is straightforward: what does a system cost here, and how long until the bill it erases pays it back. This page walks the cost per watt, the payback math for South Carolina, and what changed in 2026. For the full state incentive and utility picture, start with our South Carolina solar guide. For the mechanics behind the export credits that shape your payback, see our guide to how net metering credits your solar exports.
A 7 kW rooftop system in Columbia (ZIP 29201) produces about 10,120 kWh a year (NREL PVWatts v8), and at South Carolina’s 16.18 cents per kWh residential rate that is roughly $1,640 of grid power you stop buying each year (EIA, May 2026). That annual offset is the engine behind the payback below, and because South Carolina’s rate is moderate rather than high, the payback runs longer than in the pricey Northeast.
How much does solar cost in South Carolina?
Price is quoted in dollars per watt of system size. A typical residential install commonly runs about $2.50 to $3.00 per watt before any incentives. That is a national benchmark, not a South Carolina price filing, so treat the table as a planning starting point and get itemized local quotes to confirm your own $/W. Your price moves with system size, roof complexity, panel and inverter choice, and the installer.
| System size | Fits a home that uses | Estimated installed cost ($2.50 to $3.00/W) |
|---|---|---|
| 5 kW | Smaller bill, roughly $90 to $140/mo | About $12,500 to $15,000 |
| 7 kW | Average bill, roughly $140 to $220/mo | About $17,500 to $21,000 |
| 10 kW | Larger home or an EV, $220+/mo | About $25,000 to $30,000 |
Cost ranges are a national $/W benchmark for planning, not a guaranteed price. South Carolina has offered a state solar income-tax credit worth 25% of system cost, capped at $3,500 or 50% of your tax liability a year with a 10-year carryforward (SC Code 12-6-3775); verify it still applies to a 2026 install with the South Carolina Department of Revenue or DSIRE before you count it. Confirm your quote before you budget.
What is the solar payback in South Carolina?
Payback is cost divided by what you stop paying the utility. Because South Carolina’s rate is moderate, the annual bill offset is smaller than in high-rate states, so the payback runs longer even though system prices are similar. The table pairs the cost above with a production-based offset. Production is scaled from the verified Columbia PVWatts figure by system size, then multiplied by the 16.18 cents per kWh rate.
| System size | Estimated annual production | Estimated yearly bill offset | Simple payback |
|---|---|---|---|
| 5 kW | About 7,230 kWh | About $1,170 | About 11 to 14 years |
| 7 kW | About 10,120 kWh | About $1,640 | About 11 to 14 years |
| 10 kW | About 14,460 kWh | About $2,340 | About 11 to 14 years |
Estimates, not a guarantee. Production is scaled from NREL PVWatts v8 for Columbia and priced at the current EIA rate; under South Carolina’s Solar Choice tariff, exported power is credited below full retail, so a home that exports a lot may see a slightly longer payback, while a verified state tax credit would shorten it. Rates, production, and prices vary, so verify your own numbers.
What moves your payback in 2026
Four things decide where you land in that 11 to 14 year window:
- Your electric rate. At about 16.18 cents per kWh, every kWh your roof makes is worth a moderate amount here, which is the main reason South Carolina payback runs longer than in high-rate states (EIA).
- Your production. Roof pitch, orientation, and shading swing output. South Carolina gets strong sun (a Columbia roof averages about 5.29 peak-sun-hours a day), but estimate yours with NREL’s free PVWatts calculator before you size a system.
- Net metering (Solar Choice). South Carolina moved new rooftop customers onto the utility Solar Choice tariff after mid-2021, so exports are credited on a time-of-use basis with any year-end surplus paid at avoided cost, below full retail, rather than a flat one-to-one credit (SC Code Title 58, Chapter 40). For the mechanics, see how net metering credits your solar exports.
- No federal credit in 2026. The 30% federal Residential Clean Energy Credit (Section 25D) ended for expenditures made after December 31, 2025, under the One Big Beautiful Bill Act, so a South Carolina homeowner buying with cash or a loan in 2026 cannot claim it (IRS). See what the federal solar tax credit change means in 2026.
The honest read on South Carolina. The federal credit is gone for 2026 buyers, and the successor Solar Choice tariff credits exports below full retail, so the payback here is longer than the sub-decade numbers you see for the high-rate Northeast. The upside is strong year-round sun, similar hardware prices, and a state tax credit that can meaningfully cut your cost if it still applies to your install year. Dominion Energy South Carolina, for example, lets residential customers offset up to 100% of their usage with systems up to 20 kW (Dominion Energy), so most homes can size for their full bill. For how that utility credits exports under Solar Choice, see our Dominion Energy South Carolina solar guide. Compare our current solar incentives overview and browse the solar-by-state directory to see how South Carolina stacks up.
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How you pay changes the cost you carry
The sticker price is one thing; how you finance it decides your out-of-pocket and your payback.
| How you pay | Up-front cost | Best when |
|---|---|---|
| Cash | Full system price | You want the shortest payback and the most lifetime savings |
| Solar loan | Little or none, financed over time | You want to own the system with low money down and keep any state credit |
| Lease or PPA | $0-up-front where you qualify | You want no out-of-pocket cost and a lower or fixed power price without owning |
A lease or PPA has no up-front cost, but the company owns the panels, terms typically run 20 to 25 years and may include an annual escalator, and total payments can exceed a cash purchase. No 2026 South Carolina homeowner gets the federal residential credit, since that credit ended after December 31, 2025. For a full payback breakdown, see the financial case for whether solar panels are worth it.
Frequently asked questions
How much does solar cost in South Carolina?
Installed home solar commonly runs about $2.50 to $3.00 per watt before incentives, so a 5 kW system is roughly $12,500 to $15,000, a 7 kW system is about $17,500 to $21,000, and a 10 kW system is about $25,000 to $30,000. Those are national planning benchmarks, not a South Carolina price filing, so get itemized local quotes to confirm your own dollars per watt.
What is the payback on solar in South Carolina?
At the state’s 16.18 cents per kWh rate, a typical system offsets a moderate annual bill, so simple payback usually lands near 11 to 14 years, then years of largely free production follow. A 7 kW system in Columbia produces about 10,120 kWh a year (NREL PVWatts v8), roughly $1,640 of grid power at today’s rate (EIA, May 2026). Your real payback depends on your quote, your roof, and how much power you self-consume.
Is there a South Carolina state solar tax credit in 2026?
South Carolina has offered a state income-tax credit worth 25% of a solar system’s cost, capped at $3,500 or 50% of your tax liability per year, with a 10-year carryforward (SC Code 12-6-3775). Confirm it still applies to a 2026 install with the South Carolina Department of Revenue or DSIRE before you count it in your math, since state programs change. A verified credit would shorten the payback figures above.
Does a South Carolina homeowner qualify for the federal solar tax credit in 2026?
Not as a homeowner buying in 2026. The 30% federal Residential Clean Energy Credit (Section 25D) ended for expenditures made after December 31, 2025, under the One Big Beautiful Bill Act, so a cash or loan buyer cannot claim it. A separate commercial credit (Section 48E) can apply to leased and PPA systems, but the business that owns the system claims it, not the homeowner.
How does South Carolina net metering affect payback?
South Carolina moved new rooftop customers onto the utility Solar Choice tariff after mid-2021, so exports are credited on a time-of-use basis with any year-end surplus paid at avoided cost, below full retail, rather than a flat one-to-one credit (SC Code Title 58, Chapter 40). Customers who applied under the older full-retail rules keep those terms for a set grandfathering window. Because exports earn less than retail, self-consuming more of your own power improves your payback, so confirm the current tariff with your utility before you size a system.
Reviewed by the MySolarFY team. Cost and payback figures are estimates built from NREL PVWatts v8 production for Columbia and the EIA South Carolina residential rate, with incentive and tariff facts verified against the SC Code, DSIRE, Dominion Energy, and IRS sources as of August 2026; prices, production, tariffs, and programs change, so confirm current numbers with local installer quotes and each source before you decide. MySolarFY does not provide tax or financial advice; consult a licensed professional about your own situation. Learn more about the MySolarFY team and how we work.
MySolarFY is a free service that matches homeowners with licensed solar installers. We are not an installer, financing company, or government program. “No up-front cost” refers to qualifying lease or PPA financing, where eligible homeowners may have no out-of-pocket cost at installation. Lease and PPA terms typically run 20 to 25 years, may include an annual price escalator, and total payments may exceed the cost of a cash purchase. Homeowners do not get the federal residential credit that ended after December 31, 2025. Solar panels are not free and monthly payments apply. Cost, savings, payback, eligibility, incentives, and rates vary and are not guaranteed. See our full disclaimer.
