Middle of its segment, needs the roof space
The JAM54D40 415-440/GB/1500V module series is an advanced solution based on n-type cell technology, which redefines performance standards in the Polish climate. Thanks to the use of bifacial Double Glass architecture, these panels not only generate energy from both sides but also exhibit exceptional resistance to light-induced degradation and extreme weather conditions. It is a key response to the challenges related to installation longevity, as the glass-glass construction minimizes the risk of micro-cracks and chemical corrosion in harsh environmental conditions. This series stands out from the competition with a significantly better temperature coefficient, which translates into tangible energy gains on hot summer days when standard modules rapidly lose efficiency. It is primarily intended for demanding investors seeking maximum power density on limited roof areas and for modern photovoltaic farms where high yields from radiation reflected from the ground are key. The use of the 1500V voltage standard allows for significant optimization of wiring costs in large-scale projects, making this series one of the most cost-effective choices in the premium segment. It is a solid foundation for a safe investment, combining innovative technological solutions with above-average mechanical strength and stability of electrical parameters throughout the product life cycle.
Ranking
Signals from the data
Residential, commercial and shaded-installations.
Roofs where every square metre has to count, tight roof space and hot climates.
Bottom 17% of the N-type 400-450 W segment, against a median of 218.4.
Bottom 19% of the N-type 400-450 W segment, against a median of 21.95%.
Bottom 25% of the N-type 400-450 W segment, against a median of -0.290.
N-type TOPCon cells deliver a temperature coefficient of Pmax = -0.29%/°C vs. the typical -0.35%/°C of legacy PERC modules. At a cell operating temperature of 70°C (typical Polish summer conditions), this translates to roughly 3% higher real-world output compared to an equivalent-STC-rated PERC module, while also keeping first-year LID degradation below 1%.
The module's bifaciality factor is 80% (±10%), yielding an additional 5-15% annual energy gain under typical ground albedo of 20-30% (light gravel, snow, white TPO membrane) versus monofacial modules. The all-glass construction eliminates the rear EVA backsheet, blocking moisture ingress and electrochemical corrosion over a 30+ year service life.
JA Solar guarantees ≥87.4% of rated power after 30 years at ≤0.40% annual degradation - one of the longest warranty commitments in the 54-cell N-type segment. Direct peer comparables (KDM Kingdom Solar, Seraphim Nebula) do not publicly disclose 30-year warranty terms for equivalent power variants.
Support for 1500 V system voltage allows 25-28 modules per string (vs. ~18 at 1000 V), reducing DC cable runs, combiner boxes, and MPPT inputs. For installations above 100 kWp, estimated BoS material savings reach 4-8% of total installed cost.
JA Solar (founded 2005, HQ China) has maintained continuous BNEF Tier-1 bankable status and is listed in Q1 2026 summaries. Tier-1 status means project financing backed by these modules is accepted by banks and infrastructure funds without additional manufacturer-creditworthiness guarantees.
The /GB/1500V series carries only a 12-year product warranty, while JA Solar's own newer variant from the same family - JAM54D40 LB BF 15Y - offers 15 years. In the premium N-type segment, 12 years is increasingly viewed as the market floor and may be a constraint in project-finance structures requiring extended material coverage.
Among direct peer comparables, the Luxor ECO LINE N-TYPE TOPCON NON-REFLECT achieves 22.86% efficiency at the same 440 Wp peak power - 0.36 percentage points higher. For roof installations with tight area constraints (e.g., <20 m²), this translates to approximately 1.6% more energy from the same footprint.
- Efficiency of 21.3% is 0.6pp below the N-type 400-450W median (21.9%)
- Power density of 212.5 W/m² is 5.9 W/m² below N-type 400-450W median (218.4 W/m²) - needs more roof space
- At -0.30%/°C, hot weather performance is typical for N-type 400-450W panels
- Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof
- In the top 61% for efficiency among all N-type panels
Specifications
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.
Found 1797 panels of the same or similar size to this one, within ±10 mm. See them here Found 1928 panels of the same or similar size to this one, within ±25 mm. See them here Found 3413 panels of the same or similar size to this one, within ±50 mm. See them here Found 4007 panels of the same or similar size to this one, within ±100 mm. See them here
About the JAM54D40 415-440/GB/1500V Series series
These answers cover the whole series. Where a figure differs, the specification above is this module's own.