Light for its output, no clear weak spot
First Solar Series 6 Plus (455-480 W) stands out for using CdTe thin-film technology, which in practice provides better performance in challenging conditions compared to many silicon modules-especially at high temperatures, reduced irradiance, and partial shading. Instead of focusing solely on laboratory parameters, this series prioritizes higher real-world energy production and long-term stability, largely thanks to its resistance to typical losses such as LID and LeTID.
Additionally, the improved construction design is noteworthy: the glass-glass structure and installation solutions designed for faster mounting and less troublesome cable routing can effectively reduce BOS costs. This is an excellent choice for investors seeking reliability and predictable returns-particularly in utility-scale PV farms, commercial installations, carports, and large ground-mount systems, where installation speed, durability, and long-term profitability are key.
Ranking
Signals from the data
Commercial, utility-scale and hot-climate.
Top 17% of the CdTe 380-580 W segment, against a median of 73.9.
Top 19% of the CdTe 380-580 W segment, against a median of 184.5.
Top 21% of the CdTe 380-580 W segment, against a median of 18.50%.
CdTe thin-film technology achieves a Pmax temperature coefficient of -0.32%/°C, while typical PERC/TOPCon crystalline silicon modules fall in the -0.35% to -0.45%/°C range. In the Polish climate, where cell temperatures regularly exceed 50–65°C during summer, this difference can translate into 2–5% higher annual energy yield compared to crystalline silicon modules.
CdTe technology is structurally immune to light-induced degradation (LID) and light- and elevated temperature-induced degradation (LeTID), which cause losses of 1–3% in mono-PERC modules during the first months of operation. The guaranteed annual degradation of the Series 6 Plus is ≤0.3%/year — better than the standard 0.45–0.55%/year typical of crystalline silicon modules.
The manufacturer guarantees a linear degradation schedule over 30 years at ≤0.3%/year. Starting from a rated power of 480 Wp, the module retains >91.4% of nominal power after 30 years — significantly higher than the standard 25-year warranties with 80–84.8% end-of-life thresholds offered by competitors such as Trina, JA Solar, and LONGi.
First Solar has maintained a continuous Tier-1 bankable rating (Bloomberg NEF), streamlining project finance for utility-scale PV plants. Headquarters and primary manufacturing operations in the USA significantly reduce geopolitical and supply-chain risk compared to East Asian manufacturers.
The glass-glass laminate with edge sealing delivers high resistance to moisture ingress (PID) and mechanical loading. The absence of bypass diodes simplifies the module architecture by eliminating a known failure-prone component — a particularly valuable characteristic for long-lifecycle applications such as carports and utility-scale PV farms.
The Series 6 Plus module efficiency (18.1–19%) is 3–5 percentage points lower than comparable crystalline silicon modules in the same power class: Sunket SKT460~480M10 and Shinson S-Blade achieve 22.24%, while the Gamko GKA96N-PRO reaches 24.02%. In practice, this requires approximately 20–30% more roof or ground area to achieve the same total system power output.
The product (materials and workmanship) warranty covers 12 years, whereas leading crystalline silicon manufacturers — such as LONGi Hi-MO 6 and Jinko Tiger Neo — routinely offer 15 years, with select premium producers extending coverage to 25 years. For installations with a 25–30-year operational lifecycle, this gap may carry meaningful operational risk management implications.
- Efficiency of 19.0% matches the CdTe 450-500W median
- 190.5 W/m² power density - 6.0 W/m² more than CdTe 450-500W median (184.5 W/m²), more power per roof area
- At -0.32%/°C, hot weather performance is typical for CdTe 450-500W panels
- Ranked #12945 out of 14005 panels for efficiency in the database
Specifications
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
Alternatives
FS-6475-P-I / FS-6475A-P-I (SL) or FS-6475-P / FS-6475A-P (HL)
475 W
18.90%
-0.320
34.0 kg
Very close match
FS-6455-P-I / FS-6455A-P-I (SL) or FS-6455-P / FS-6455A-P (HL)
455 W
18.10%
-0.320
34.0 kg
-25 W, -0.9 pp
FS-6460-P-I / FS-6460A-P-I (SL) or FS-6460-P / FS-6460A-P (HL)
460 W
18.30%
-0.320
34.0 kg
-20 W, -0.7 pp
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