Middle of its segment, modest efficiency
JA Solar JAM54D41 400-425/GB series modules bring a new level of quality to prosumer installations thanks to the use of n-type cells in Bycium+ technology. This innovative architecture significantly reduces light-induced degradation, which translates into stable energy production for decades. This series solves the problem of performance drops in difficult weather conditions, offering an exceptionally low temperature coefficient and better responsiveness on cloudy days. The Double Glass design ensures excellent mechanical strength and full resistance to corrosive factors, making these panels an ideal choice for investors looking for long-term solutions. Thanks to the use of Super Multi-Busbar (SMBB) technology, these modules minimize current transmission losses within the cell, maximizing yields from every square meter of the roof. This solution is primarily dedicated to modern residential housing and small businesses, where aesthetics and maximizing self-consumption are key. Compared to standard p-type modules, this series offers significantly higher bifacial efficiency and a longer linear power output warranty, which realistically increases the profitability of the entire photovoltaic investment in Polish solar conditions.
Ranking
Signals from the data
Residential, commercial and shaded-installations.
Tight roof space and roofs where every square metre has to count.
Bottom 17% of the TOPCon 400-450 W segment, against a median of 22.00%.
Bottom 18% of the TOPCon 400-450 W segment, against a median of 220.2.
The top variant of the series reaches 21.8% module efficiency, outperforming all listed peers: Hyundai DG G12 PERC Shingled (21.4%), Trina Solar Vertex S (21.3%), and Tongwei TERRA 5K (21.4%). This translates to higher energy yield per unit of available roof area.
N-type TOPCon eliminates Light-Induced Degradation (LID) typical of P-type PERC cells. The power temperature coefficient is -0.29%/°C versus ~-0.35%/°C for PERC - roughly 17% lower thermal losses at module temperatures above 25°C, a meaningful advantage given high summer roof temperatures in Central European climates.
Dual 1.6 mm heat-strengthened glass provides PID resistance, corrosion immunity, and high snow-load tolerance. The ~80%±10% bifaciality factor enables additional rear-side energy yield - particularly advantageous on light-colored flat roofs or ground-mount systems with reflective surfaces.
The manufacturer guarantees ≤1% first-year degradation and ≤0.4%/year thereafter, ensuring ≥87.4% of rated power after 30 years. This is consistent with current premium-segment benchmarks and comparable to Trina Solar Vertex S and Tongwei TERRA 5K published warranty terms.
JA Solar has maintained BNEF Tier-1 status through Q1 and Q2 2026, alongside Jinko Solar, LONGi, and Trina Solar. This designation is a prerequisite for project financing by institutional lenders and significantly reduces counterparty risk for both utility-scale developers and residential prosumers.
The JAM54D41 400-425/GB was in production for approximately one year (launched 2022, end-of-life 2023). Limited new inventory on the distribution market raises the risk of delays in warranty replacements and makes future system expansions with identical modules difficult.
Newer variants of the same family (JAM54D41 LB/MB) already carry a 25-year product warranty, as does the majority of currently available Tier-1 premium modules. The 12-year product warranty on the GB series is a clear disadvantage compared to today's market and should be factored into TCO calculations for installations with a 20+ year horizon.
- Efficiency of 21.5% matches the TOPCon 400-450W median
- At 215.1 W/m², this panel generates 5.1 W/m² less per unit area than TOPCon 400-450W median (220.2 W/m²)
- At -0.30%/°C, hot weather performance is typical for TOPCon 400-450W panels
- 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces
- Ranked #8022 out of 14129 panels for efficiency in the database
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 JAM54D41 400-425/GB Series series
These answers cover the whole series. Where a figure differs, the specification above is this module's own.