The two numbers that matter
Electricity price: 15.5¢/kWh, below the national state average of 19.3¢. Every kilowatt-hour your panels make replaces one you'd buy at this price, so higher prices mean faster payback.
Sunshine: 5.3 peak sun hours a day, more than the state average of 5.0. Each kW of panels here makes roughly 1,517 kWh a year after real-world losses.
Estimates by bill size
| Monthly bill | Usage | System | Cost | Year-1 savings | Payback | 25-yr net |
|---|---|---|---|---|---|---|
| $100/month | 645 kWh | 4.6 kW | $13,780 | $920 | 13 yrs | $17,520 |
| $150/month | 968 kWh | 6.9 kW | $20,660 | $1,380 | 13 yrs | $26,280 |
| $250/month | 1613 kWh | 11.5 kW | $34,440 | $2,300 | 13 yrs | $43,800 |
Assumes $3.00/W installed, 90% usage offset, no federal tax credit, 3% yearly price rise and 0.5% yearly panel degradation. Sources: US Energy Information Administration (EIA), Electric Power Monthly, residential average price, July 2026; NREL PVWatts / NSRDB, average peak sun hours for each state's largest city.
Incentives in south-carolina.html
South Carolina offers a state income tax credit of 25% of system cost, up to $35,000 (applied over several years). Check DSIRE for current rules.
The US 30% Residential Clean Energy Credit ended for homeowner systems installed after December 31, 2025. Leased systems and PPAs may still be priced with a federal business credit. See solar incentives in 2026.
Plug-in and balcony solar in south-carolina.html
No dedicated plug-in solar law yet as of October 2026. Ask your utility before connecting anything to an outlet; most require an interconnection application. Over 30 states have considered bills, so check back.
Estimate a kit with the plug-in solar calculator.
Next steps
- Check your actual rate on your bill. Many utilities in south-carolina.html charge more or less than the state average.
- Run your own numbers in the savings calculator.
- Get at least three quotes and compare the price per watt. Use our quote checklist.
Questions about solar in south-carolina.html
Is solar worth it in south-carolina.html?
Fair case. Solar can work, but the margin is thinner. Quote shopping and a cash or low-rate loan matter more.
How much does a solar system cost in south-carolina.html?
At about $3.00 per watt before incentives, a 6.9 kW system costs roughly $20,660. Local quotes vary with roof, equipment and installer.
How many panels would a south-carolina.html home need?
For a $150 monthly bill, about 6.9 kW, or roughly 2.3 panels per kW using 430 W panels. Use the system size calculator for your exact usage.