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Brand range: 67.5W–550W
Thin-Film
First Solar FS-390-Plus
Max Power
90W
Efficiency
12.5%
Operating V
44.4V
Warranty
25Y
Technical Specifications
| Open Circuit Voltage (Voc) | 56.9V |
| Short Circuit Current (Isc) | 2.27A |
| Voltage at Pmax (Vmp) | 44.4V |
| Current at Pmax (Imp) | 2.03A |
| Temp. Coefficient of Pmax | -0.249%/°C |
| Dimensions | 1200 x 600 x 35 mm |
| Weight | 9.0kg |
| NOCT | 44.6°C |
| PTC Rating | 86.7W |
📋 Data verified: June 2026
📄 Specs based on STC (1000 W/m², 25°C, AM 1.5)
🏷️ 218 First Solar models in database
FAQ
How efficient is the First Solar FS-390-Plus?
This panel has 12.5% efficiency, which is standard for commercial solar panels.
How long is the warranty for the First Solar FS-390-Plus?
The FS-390-Plus comes with a 25-year product warranty covering defects and degradation.
How does temperature affect the First Solar FS-390-Plus?
With a temp coefficient of -0.249%/°C, it outperforms the industry average of -0.35 to -0.40%/°C.
What is the max power output of the First Solar FS-390-Plus?
The First Solar FS-390-Plus is rated at 90W under STC (1000 W/m², 25°C, AM 1.5).
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📊 Brand Context
First Solar offers 218 solar panel models from 67.5W to 550W.
Browse all First Solar models →