Solar Payback Period in South Carolina
Estimated payback, savings, and ROI for a residential solar system in South Carolina — updated for 2026
Urgent tax credit deadlines
- Section 30D EV credit (up to $7,500) — expires June 30, 2026 (12 days left).
- Section 48E solar ITC safe harbor — construction must start by July 4, 2026 (16 days left).
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Solar ROI Overview for South Carolina
Based on South Carolina's average of 5.1 peak sun hours per day and utility rates of $0.133/kWh, a typical 7kW residential solar system in South Carolina would:
- Cost approximately $19,600 before incentives
- Generate about 10,033 kWh/year
- Save you $1,334/year ($111/month)
- Pay for itself in 14.7 years
- Deliver a 70% ROI over 25 years
South Carolina has excellent solar potential with above-average sun hours, making it one of the better states for solar investment.
Payback by System Size in South Carolina
| System Size | Cost | Production | Annual Savings | Payback | 25yr ROI |
|---|---|---|---|---|---|
| 4 kW | $11,200 | 5,733 kWh | $762 | 14.7 yrs | 70% |
| 5 kW | $14,000 | 7,167 kWh | $953 | 14.7 yrs | 70% |
| 6 kW | $16,800 | 8,600 kWh | $1,144 | 14.7 yrs | 70% |
| 7 kW | $19,600 | 10,033 kWh | $1,334 | 14.7 yrs | 70% |
| 8 kW | $22,400 | 11,467 kWh | $1,525 | 14.7 yrs | 70% |
| 10 kW | $28,000 | 14,334 kWh | $1,906 | 14.7 yrs | 70% |
How Solar Payback Works in South Carolina
Solar payback period is the time it takes for your cumulative electricity savings to equal the total cost of your solar system. In South Carolina, the calculation depends on three key factors:
- System cost — $2.80/Watt average in South Carolina
- Electricity rate — $0.133/kWh average utility rate
- Solar production — 5.1 average peak sun hours/day
After the payback period of 14.7 years, your solar panels continue generating free electricity for 15-20+ more years. With utility rates historically increasing 2-4% annually, your actual savings will likely exceed these estimates.
South Carolina Solar Data Summary
- Average Cost/Watt
- $2.80
- Average Utility Rate
- $0.133/kWh
- Peak Sun Hours
- 5.1 hrs/day
- Data Coverage
- 3 ZIP codes
Related Tools for South Carolina
Compare with Fastest Payback States
| State | Payback | Annual Savings | 25yr ROI |
|---|---|---|---|
| South Carolina (you) | 14.7 yrs | $1,334 | 70% |
| Louisiana | 11.8 yrs | $1,537 | 111% |
| South Dakota | 13.5 yrs | $1,452 | 85% |
| West Virginia | 13.7 yrs | $1,433 | 83% |
| Minnesota | 13.8 yrs | $1,574 | 81% |
| Kentucky | 13.9 yrs | $1,359 | 80% |
📖 Complete Guide to Solar ROI
Want to understand every factor that affects your solar payback period? Read our comprehensive guide covering financing options, NEM policies, and how to maximize your returns.
Read: Complete Guide to Solar ROI in 2026 →