Peak Sun Hours in Louisiana
2026 NREL PVWatts v8 Data
Louisiana averages 5.32 peak sun hours per day, ranking #13 of 51 US states and DCfor solar potential per NREL's PVWatts v8 model. That puts Louisiana 7% above the US average of 4.98 PSH.
Monthly Peak Sun Hours in Louisiana
Louisiana's solar resource peaks in May at 6.46 peak sun hours per day and bottoms out in January at 3.74. That January figure is the one that matters most for sizing.
What 5.32 Peak Sun Hours Actually Means
A peak sun hour represents one hour of solar irradiance at 1,000 watts per square meter. Louisiana gets far more daylight hours than 5.32, but the sun isn't always at peak intensity. Peak sun hours compress a full day's variable sunshine into an equivalent number of full-power hours.
In practical terms, 5.32 PSH means a 400W solar panel in Louisiana produces about 1.60 kWh per day after real-world losses.
Solar Production in Louisiana
Benchmarks: U.S. avg 4.98 · Phoenix 6.54 (highest) · Seattle 3.95 · Anchorage 3.17 (lowest). Above ~5.5 = sunny · 4.5–5.5 = average · below 4.5 = cloudy.
Tap to see sensitivity analysisSensitivity analysis
| Scenario | Value |
|---|---|
| Low (-20%) | 1.3 kWh |
| Expected | 1.6 kWh |
| High (+20%) | 1.9 kWh |
Your daily production scales linearly with both panel wattage and peak sun hours. A 10% change in either input changes your result by 10%.
Worked Examples for Louisiana
| System Size | Daily kWh | Monthly kWh | Yearly kWh |
|---|---|---|---|
| 3 kW | 16.0 | 479 | 5,825 |
| 5 kW | 26.6 | 798 | 9,709 |
| 10 kW | 53.2 | 1,596 | 19,418 |
Using Louisiana's annual average of 5.32 PSH. Winter production drops ~30%; summer runs ~25% higher.
How Louisiana Compares
The US average is 4.98 PSH per day, so Louisiana sits 7% above the national average.
| State | Annual PSH | Rank |
|---|---|---|
| Wyoming | 5.36 | 11 |
| South Carolina | 5.33 | 12 |
| Louisiana | 5.32 | 13 |
| Mississippi | 5.26 | 14 |
| North Carolina | 5.25 | 15 |
Best and Worst Months
May is the best month at 6.46 PSH. A 5 kW system produces roughly 32.3 kWh per day — nearly 1.7x what it produces in January.
January is the weakest month at 3.74 PSH. Size your system for January to ensure year-round coverage.
Is Solar Worth It in Louisiana?
With 5.32 PSH, Louisiana has excellent solar potential. The federal ITC covers 30% of installation costs through 2032.
Methodology & Data Source
NREL PVWatts v8 / NSRDB, fetched April 2026 for New Orleans (29.9511°N, -90.0715°W). 1 kW reference system, fixed roof mount, 20° tilt, 180° azimuth, 14% losses.
Source: NREL PVWatts v8