South Carolina vs Tennessee Solar Comparison
South Carolina gets more sun (4.8 hrs/day) while South Carolina has the faster payback (9 years).South Carolina offers higher 20-year savings at $33,200.
South Carolina
4.8 hrs
9yr payback
$33,200
20yr savings
Tennessee
4.3 hrs
11.5yr payback
$26,400
20yr savings
Side-by-Side Comparison
| Metric | South Carolina | Tennessee |
|---|---|---|
| Peak Sun Hours | 4.8 hrs | 4.3 hrs |
| Cost per Watt | $2.85 | $3.00 |
| 6kW System Cost | $17,100 | $18,000 |
| Federal Tax Credit | 30% | 30% |
| State Tax Credit | 25% | None |
| State Rebate | None | None |
| Net Metering | Full Net Metering | No Net Metering |
| Electricity Rate | 14.43¢/kWh | 12.91¢/kWh |
| Payback Period | 9 years | 11.5 years |
| 20-Year Savings | $33,200 | $26,400 |
Verdict
South Carolina is the better state for solar ROI with $33,200 in 20-year savings and a 9-year payback period. South Carolina has more sun exposure at 4.8 hrs/day, making it ideal for maximum energy production. Both states qualify for the 30% federal solar tax credit.
Frequently Asked Questions
Is solar better in South Carolina or Tennessee?
South Carolina gets more sun (4.8 peak hours/day vs 4.3). South Carolina has a faster payback (9 years) and South Carolina offers higher 20-year savings ($33,200).
How do solar costs compare between South Carolina and Tennessee?
A 6kW system costs $17,100 in South Carolina vs $18,000 in Tennessee before incentives. Both qualify for the 30% federal tax credit.
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Data verified March 2026 · Source: NREL, DSIRE, EIA