Middle of its segment, modest efficiency
The JA Solar DEEP BLUE 4.0 JAM78D40 600-625/MB/1500V series is based on the groundbreaking n-type Bycium+ cell architecture, which sets new efficiency standards in the industrial sector. The use of SMBB technology allows for better light absorption and minimization of transmission losses, resulting in stable operation even in challenging lighting conditions. These panels solve the key problem of limited installation space by offering high power density while simultaneously reducing BOS system costs and LCOE. Thanks to the bifacial (double-sided) design, these modules generate additional energy from reflected radiation, making them an ideal choice for large-scale photovoltaic farms and advanced commercial installations. A standout feature compared to the competition is the exceptionally low temperature coefficient and minimal light-induced degradation (LID), which guarantees longevity and maximizes profits throughout the power plant's entire life cycle. The robust double-glass construction ensures maximum mechanical resistance to extreme weather events, protecting the investment from micro-cracks. This is an advanced solution for investors seeking uncompromising reliability and the highest return on capital in the Polish renewable energy market.
Ranking
Signals from the data
Utility-scale, commercial and hot-climate.
Tight roof space, roofs where every square metre has to count and weight-limited structures.
Bottom 1% of the N-type 600-650 W segment, against a median of 22.77%. Ranked 7,958th in the whole database.
Bottom 1% of the N-type 600-650 W segment, against a median of 227.7. Ranked 8,200th in the whole database.
Bottom 5% of the N-type 600-650 W segment, against a median of 52.7. Ranked 11,358th in the whole database.
N-type cells exhibit lower light-induced degradation (LID) than standard PERC and a superior temperature coefficient of Pmax at -0.30%/°C. At typical summer module temperatures of 60–70°C, this translates into measurably higher energy yield compared to P-type modules in the same power class. The Super Multi Busbar (SMBB) design further reduces series resistance and improves capture of diffuse photons.
The bifacial design enables additional energy harvest from reflected irradiance off the ground surface (bifacial gain typically 5–15% depending on albedo), while the dual-glass 2+2 mm structure eliminates microcrack risk from transport stress and snow/wind loading. Removing the backsheet also eliminates PID and moisture-driven PO degradation pathways.
JA Solar guarantees ≥93.4% rated power retention after 15 years and ≥87.4% after 30 years, with a 0.4%/year linear degradation rate and only 1% first-year degradation. For utility-scale projects targeting a 30+ year asset life, these parameters directly reduce LCOE compared to series offering only 25-year warranties with ~0.55%/year degradation.
JA Solar is listed on the BNEF Tier-1 Solar Module Manufacturers list as of Q1 2026, with 100 GW of annual production capacity, ranking in the global top four alongside LONGi, Jinko Solar, and Trina Solar. This status satisfies bankability requirements for non-recourse project financing at most international lending institutions.
The JAM78D40 600–625/MB series reached end-of-life in 2023. Limited availability of new modules increases the risk of being unable to source additional panels for capacity additions, and a shortened support chain may complicate enforcement of the 12-year product warranty for claims filed after 2030.
The series peaks at 22.4% module efficiency, while direct 625 Wp competitors achieve: LONGi Hi-MO 7 LR8-66HGD — 23.1%, DAH Solar DHN-66Z16/DG — 23.14%. The 0.7–0.74 percentage-point gap means competing modules produce approximately 3% more energy for the same array footprint — a quantifiable LCOE disadvantage on projects above 5 MWp.
- Efficiency of 21.5% is 1.3pp below the N-type 600-650W median (22.8%)
- 214.7 W/m² power density is 13.0 W/m² below N-type 600-650W median (227.7 W/m²) - requires larger installation area
- Temperature coefficient of -0.30%/°C matches the N-type 600-650W median
- At 34.6 kg, this panel is 2.1 kg heavier than the N-type 600-650W median (32.5 kg) - more demanding for installation crews
- 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces
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 616 panels of the same or similar size to this one, within ±10 mm. See them here Found 616 panels of the same or similar size to this one, within ±25 mm. See them here Found 616 panels of the same or similar size to this one, within ±50 mm. See them here Found 1813 panels of the same or similar size to this one, within ±100 mm. See them here