Iowa vs South Carolina 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.
Iowa
4.2 hrs
10.2yr payback
$28,400
20yr savings
South Carolina
4.8 hrs
9yr payback
$33,200
20yr savings
Side-by-Side Comparison
| Metric | Iowa | South Carolina |
|---|---|---|
| Peak Sun Hours | 4.2 hrs | 4.8 hrs |
| Cost per Watt | $3.10 | $2.85 |
| 6kW System Cost | $18,600 | $17,100 |
| Federal Tax Credit | 30% | 30% |
| State Tax Credit | None | 25% |
| State Rebate | None | None |
| Net Metering | Full Net Metering | Full Net Metering |
| Electricity Rate | 15.14¢/kWh | 14.43¢/kWh |
| Payback Period | 10.2 years | 9 years |
| 20-Year Savings | $28,400 | $33,200 |
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 Iowa or South Carolina?
South Carolina gets more sun (4.8 peak hours/day vs 4.2). South Carolina has a faster payback (9 years) and South Carolina offers higher 20-year savings ($33,200).
How do solar costs compare between Iowa and South Carolina?
A 6kW system costs $18,600 in Iowa vs $17,100 in South Carolina before incentives. Both qualify for the 30% federal tax credit.
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Data verified March 2026 · Source: NREL, DSIRE, EIA