Kentucky Solar Production & Irradiance Data
4 peak sun hours/day · 6,936 kWh/year from a 6kW system · near national average
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Kentucky receives an average of 4 peak sun hours per day, which translates to a Global Horizontal Irradiance (GHI) of 4 kWh/m²/day. When solar panels are tilted at the optimal angle for Kentucky's latitude, irradiance increases to 4.55 kWh/m²/day — a 14% boost over flat-mounted panels.
This puts Kentucky near the national average of 4.29 peak sun hours per day. Kentucky's solar resource is comparable to the national average, making solar a solid investment — especially with current incentive programs. These figures are derived from NREL solar resource maps and PVWatts reference calculations.
Expected Annual Output by System Size
| System Size | Annual Output | Avg Monthly | Annual Savings | 25-Year Savings |
|---|---|---|---|---|
| 4 kW (12-16 panels) | 4,624 kWh | 385 kWh | $612/yr | $15,300 |
| 6 kW (18-24 panels) | 6,936 kWh | 578 kWh | $918/yr | $22,950 |
| 8 kW (24-32 panels) | 9,248 kWh | 771 kWh | $1,224/yr | $30,600 |
| 10 kW (30-40 panels) | 11,560 kWh | 963 kWh | $1,531/yr | $38,275 |
Based on 4.55 kWh/m²/day tilt irradiance, 14% system losses, and 13.24¢/kWh electricity rate. Actual output varies by installation specifics.
Month-by-Month Solar Production in Kentucky
Estimated monthly output for a 6kW system:
Solar production in Kentucky peaks in June when a 6kW system generates approximately 798 kWh — about 11.5% of annual production in a single month. The lowest production month is December at approximately 277 kWh (4% of annual output). This 2.9:1 seasonal ratio is relatively moderate, meaning your solar production stays fairly consistent throughout the year.
How Kentucky Compares Nationally
Tips for Maximizing Solar Production in Kentucky
Kentucky's 4 peak sun hours per day provides solid solar production. Proper panel orientation is important — aim for south-facing at Kentucky's latitude tilt angle for optimal year-round performance.
Consider adding battery storage to your Kentucky solar system. A 10-13 kWh home battery lets you store excess daytime production for evening use, maximizing your self-consumption and reducing grid dependence. This is especially valuable in Kentucky where net metering credits are limited.
Solar Irradiance Technical Data
Global Horizontal Irradiance (GHI): 4 kWh/m²/day. GHI measures the total solar radiation received on a horizontal surface, including direct sunlight and diffuse radiation from clouds and atmospheric scattering. This is the baseline measurement for solar resource assessment.
Tilt Irradiance: 4.55 kWh/m²/day. When panels are tilted at the optimal angle for Kentucky's latitude, they receive 14% more solar radiation than flat-mounted panels. This tilt optimization is one of the easiest ways to boost your system's output.
System Output Estimation: The annual production figures use the NREL PVWatts methodology: Tilt Irradiance × 365 days × System Size × (1 − System Losses) × Inverter Efficiency. We use 14% system losses (wiring, soiling, degradation, mismatch) and 96% inverter efficiency, matching PVWatts defaults.
Kentucky Solar Production FAQ
How many peak sun hours does Kentucky get?▼
Kentucky averages 4 peak sun hours per day, which is near the national average of 4.29 hours. Peak sun hours represent hours of full-intensity sunlight equivalent — a key factor in estimating solar panel output. This data is derived from NREL solar resource maps and PVWatts reference calculations.
How much electricity will a 6kW solar system produce in Kentucky?▼
A 6kW solar system in Kentucky produces approximately 6,936 kWh per year, or about 578 kWh per month on average. Production peaks in June (approximately 798 kWh) and is lowest in December (approximately 277 kWh). At Kentucky's average rate of 13.24¢/kWh, this saves you about $918/year.
What is the best month for solar production in Kentucky?▼
June is typically the best month for solar production in Kentucky, with a 6kW system producing approximately 798 kWh. The long daylight hours and high sun angle combine for maximum energy generation. The worst month is December, producing about 277 kWh — roughly 35% of the best month's output.
How does Kentucky's solar potential compare to other states?▼
Kentucky's average of 4 peak sun hours per day puts it near the national average of 4.29 hours. A 6kW system in Kentucky produces 6,936 kWh/year, compared to the national average of 7,562 kWh/year — that's -626 kWh/year (-8%). Even at Kentucky's 13.24¢/kWh rate, solar delivers solid returns.
What affects solar panel output in Kentucky?▼
Key factors affecting solar output in Kentucky include: roof orientation (south-facing is ideal), tilt angle (latitude tilt of 36° is optimal), shading from trees or buildings, panel efficiency rating, and local weather patterns. Kentucky's GHI (Global Horizontal Irradiance) is 4 kWh/m²/day, but panels tilted at the optimal angle receive 4.55 kWh/m²/day — a 14% improvement over flat-mounted panels.
More Kentucky Solar Resources
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Kentucky Solar Data
- ☀️ Peak Sun Hours: 4 hrs/day
- 📊 GHI: 4 kWh/m²/day
- 📐 Tilt Irradiance: 4.55 kWh/m²/day
- ⚡ 6kW Output: 6,936 kWh/yr
- 📈 Best Month: June
- 📉 Worst Month: December
- 💡 Electricity Rate: 13.24¢/kWh
- 💰 Annual Savings (6kW): $918
- 📋 Data: NREL Reference Data