Solid all-round for its segment
The JA Solar DEEPBLUE 4.0X / JAM72D40 555-580/MB series are modules designed for maximum yield in installations where long-term profitability matters. The use of n-type TOPCon cells helps limit typical losses associated with older technologies, stabilizing energy production over time. The bifacial double-glass construction allows for utilizing reflected light from the ground, genuinely increasing yield, especially on open land, light-covered roofs, and projects with appropriately selected module underlayments.
In practice, this series solves the issue of power drops at high temperatures thanks to its favorable temperature coefficient, while also minimizing the risk of micro-cracking and accelerated degradation, as glass-glass construction better protects the lamination. Furthermore, SMBB and dense packing improve current collection and resistance to partial shading, translating to more stable string performance.
This is an excellent choice for PV farms, large industrial rooftops, carports, and projects where high yields, longevity, and lower BOS costs per kWh are key.
Ranking
Signals from the data
Commercial, utility-scale, hot-climate and shaded-installations.
N-type TOPCon technology eliminates LID/LeTID degradation typical of P-type PERC, limiting first-year power loss to 1% followed by ≤0.4%/year over 30 years. The Pmax temperature coefficient of -0.30 %/°C (vs. -0.35 %/°C for standard PERC) delivers measurably higher yield during summer months.
The glass-glass construction with up to 80% bifaciality captures ground-reflected irradiance, boosting annual energy yield by 5-15% vs. monofacial modules in ground-mount and light-colored rooftop installations. The dual-glass laminate also provides superior moisture barrier and microcrack resistance compared to glass-backsheet designs.
The 580 Wp variant achieves 22.5% module efficiency, at or above direct peer comparables: Emmvee Titanium Duo (22.45%) and ZNShine ZXM7-UHLD144 (22.44%). Six power bins (555-580 Wp) allow flexible string sizing and roof area optimization.
JA Solar holds continuous BNEF Tier-1 status, satisfying non-recourse project finance criteria recognized by international banks. The linear power warranty guarantees ≤1% degradation in year 1 and ≤0.4%/year for years 2-30, ensuring ≥87.4% of rated Pmax over the full 30-year operating cycle.
The DEEPBLUE 4.0X (JAM72D40 555-580/MB) reached end-of-life around 2024 and was superseded by the DEEPBLUE 4.0 Pro (JAM72D40-580-605/MB). This limits new module availability on the secondary market, makes future capacity additions with matched units difficult, and reduces active distributor-level service support over time.
The materials and workmanship warranty stands at 12 years, versus longer coverage offered by premium European manufacturers (REC Group: 20 years, Q CELLS: 25 years). While 12 years matches the standard among Chinese Tier-1 peers (Longi, Jinko), a shorter product warranty represents an incremental TCO risk factor when modeling 25-30-year project lifetimes.
- At 22.5% efficiency, this panel is on par with typical TOPCon 550-600W modules
- At 224.5 W/m² power density, roof space requirements are typical for TOPCon 550-600W panels
- Temperature coefficient of -0.30%/°C matches the TOPCon 550-600W median
- 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces
- In the top 30% for efficiency among all TOPCon 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.
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About the DEEPBLUE 4.0X / JAM72D40 555-580/MB series
These answers cover the whole series. Where a figure differs, the specification above is this module's own.