What solar costs in South Carolina
Berkeley Lab does not have enough reported installations in South Carolina to publish a reliable local price, so the figures below use the national median. Treat them as a starting point, not a quote.
The numbers
High electricity prices make solar pay faster, so a red figure in the third box is good news for a solar buyer and bad news every other month of the year.
Holding a quote above $30,000? Installers in South Carolina price the same system very differently. Two more bids is the cheapest way to find out where yours sits.
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What the roof makes month by month in Charleston
A 1.7 to 1 swing, which is unusually flat. Output here is steadier month to month than almost anywhere else in the country, so monthly bills stay more predictable.
Figures are for an 8 kW array at 20 degrees facing south, modelled from NSRDB radiation data at Charleston.
What different sizes cost in South Carolina
| Size | Panels | Price | Output | Year one saving | Payback |
|---|---|---|---|---|---|
| 4 kW | 10 | $15,000 | 5,768 kWh | $892 | 14.6 years |
| 5 kW | 13 | $18,750 | 7,210 kWh | $1,115 | 14.6 years |
| 6 kW | 15 | $22,500 | 8,652 kWh | $1,338 | 14.6 years |
| 7 kW | 18 | $26,250 | 10,094 kWh | $1,562 | 14.6 years |
| 8 kWtypical | 20 | $30,000 | 11,536 kWh | $1,785 | 14.6 years |
| 10 kW | 25 | $37,500 | 14,420 kWh | $2,231 | 14.6 years |
| 12 kW | 30 | $45,000 | 17,304 kWh | $2,677 | 14.6 years |
| 15 kW | 38 | $56,250 | 21,630 kWh | $3,346 | 14.6 years |
| 20 kW | 50 | $75,000 | 28,840 kWh | $4,462 | 14.6 years |
Payback is the same at every size because this table holds the price per watt flat at the national median of $3.75: price and output both grow in step with the system, so their ratio does not change. Real quotes are not quite linear. Permitting, design and connection cost roughly the same on any roof, so a small system usually costs more per watt and a large one less, and pays back correspondingly later or sooner than shown.
South Carolina has too few reported installations for a local median, so the price is the national median of what households paid on host-owned systems installed in 2024-2025, compiled by Berkeley Lab. Local quotes can sit well above or below it.
7 programmes in South Carolina
The 30% federal credit ended for installations completed after 31 December 2025. These state, utility and local programmes are unaffected by that, and are now the only thing that reduces the price.
| Programme | Type | Run by | Reach | Updated |
|---|---|---|---|---|
| Interconnection Guidelines | Interconnection | State | statewide | June 7, 2024 |
| Net Metering | Net Metering | State | statewide | March 2, 2026 |
| Renewable Energy and Energy Storage Property Tax Exemption | Property Tax Incentive | State | statewide | March 23, 2026 |
| Santee Cooper - Rooftop Solar Rebate Program | Rebate Program | Utility | statewide | March 23, 2026 |
| Solar Energy, Small Hydropower, and Geothermal Tax Credit (Corporate) | Corporate Tax Credit | State | statewide | March 23, 2026 |
| Solar Energy, Small Hydropower, and Geothermal Tax Credit (Personal) | Personal Tax Credit | State | statewide | March 23, 2026 |
| Santee Cooper - Renewable Energy Resource Loans | Loan Program | Utility | partial | March 23, 2026 |
Programme index from DSIRE, N.C. Clean Energy Technology Center, NC State University, licensed CC BY-SA 4.0. “Partial” means it reaches only some utilities or counties. A listed programme can still be closed or out of budget, so check its own page before counting on it.
How South Carolina ranks
Closest on payback: Ohio (13.9 yrs), Georgia (14.3 yrs), Kansas (14.7 yrs), Alabama (15.1 yrs).
Solar in South Carolina, answered
How much do solar panels cost in South Carolina?
An 8 kW system in South Carolina, roughly 20 panels, costs about $30,000 before incentives. That is based on $3.75 per watt, the national median from Lawrence Berkeley National Laboratory for 2024-2025, because too few South Carolina installations are reported to publish a local figure. There is no longer a federal tax credit to subtract from that figure.
Is there still a 30% solar tax credit in South Carolina?
No. The federal Residential Clean Energy Credit under Internal Revenue Code section 25D was terminated by the One Big Beautiful Bill Act for expenditures made after 31 December 2025, and it did not step down first. A South Carolina homeowner buying a system with cash or a loan today receives no federal tax credit. Under a lease or power purchase agreement the credit survives as section 48E but belongs to the company that owns the equipment, not to the household. South Carolina still has 7 state, utility or local programmes covering rooftop solar.
How long do solar panels take to pay for themselves in South Carolina?
About 14.6 years in South Carolina. An 8 kW system costs roughly $30,000 and saves about $1,785 in its first year at the state's average residential rate of 15.47 cents per kilowatt-hour (EIA, July 2026). That calculation includes no federal tax credit, because the residential credit ended after 31 December 2025.
How much electricity does a solar panel produce in South Carolina?
Each kilowatt of panels in South Carolina produces about 1,442 kilowatt-hours a year, modelled at Charleston facing south at a 20 degree tilt using NSRDB radiation data. An 8 kW system therefore makes roughly 11,536 kilowatt-hours a year. The national average is about 1,332 kilowatt-hours per kilowatt installed.
Is solar worth it in South Carolina?
It depends less on sunshine than on your electricity price. In South Carolina power costs 15.47 cents per kilowatt-hour (EIA, July 2026), which makes an 8 kW system pay for itself in about 14.6 years and clear roughly $27,071 over 25 years. Solar from your own roof works out at 11.0 cents per kilowatt-hour over its life, against 15.47 cents from the utility.
How many solar panels do I need in South Carolina?
A typical South Carolina installation is about 20 panels, which is 8 kW at the 400 watt module that is now standard and needs roughly 440 square feet of roof. To size it to your own use, divide your annual kilowatt-hours by 1,442, which is what each kilowatt of panels produces in South Carolina each year.
Do solar panels work in winter in South Carolina?
Yes, but output falls sharply. In Charleston a kilowatt of panels makes about 148 kilowatt-hours in May and about 87 in Dec, a swing of 1.7 to 1 across the year. A system sized to cover your annual consumption will therefore run a surplus in summer and leave you buying power in winter, so how your utility settles that difference matters as much as the size of the array.
Three competing quotes beat any amount of comparing panel brands
Sales cost and margin are over a third of an installed price in South Carolina, and they are the part that competition removes. A single quote from whoever reached you first is how people end up in the top quarter of what their neighbours paid.
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Berkeley Lab publishes installed prices once a year, the EIA updates electricity rates every month, and Congress changed the tax treatment of all of this in 2025. One email when something on this site actually changes, and nothing else.
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