Solid all-round for its segment
The JA Solar JAM72D40 LB series is designed to maximize yield in projects where every square meter counts, and predictable energy production is key. The use of N-type TOPCon cells helps minimize typical losses seen in older technologies and maintains stable module performance over the long term. The double-glass construction enhances environmental resistance, valued by investors prioritizing longevity and lower service risks. A key advantage is bifacial capability-the module can harvest energy from both sides, effectively boosting yield on bright rooftops, ground-mounted structures, or farms with appropriately oriented module surfaces. Thanks to half-cut cells and a multi-busbar configuration, the series performs better with microcracking and electrical loads, simplifying string design. This is the choice for PV farms, large industrial rooftops, and installations where LCOE, reliability, and consistent quality are top priorities.
Ranking
Signals from the data
Utility-scale, commercial and shaded-installations.
The top variant delivers 23.2% module efficiency, outperforming direct comparables: GCL-M12/60H (21.7%), Risen TITAN (21.7%), and LONGi Hi-MO X6 Explorer (22.8%). The 0.4-1.5 pp advantage translates into meaningfully higher energy yield per unit of roof or ground area.
N-type TOPCon cells eliminate the LID (Light Induced Degradation) effect common in P-type PERC. Annual degradation is approximately 0.4%/year (after ~1% first-year loss) vs. 0.5-0.55%/year for PERC, resulting in approximately 87% retained nameplate power after 30 years - consistent with JA Solar's linear power warranty.
Bifaciality factor reaches ~80% (±5%), delivering an additional 5-15% energy yield on ground-mount and light-colored rooftop installations compared to monofacial modules. The dual-glass laminate eliminates the backsheet as a failure point and improves resistance to moisture ingress, PID, and UV degradation.
JA Solar guarantees linear power degradation not exceeding ~0.55%/year over 30 years - a bankability-grade commitment critical for LCOE modeling and non-recourse project finance underwriting. The product (workmanship) warranty period is 12 years.
JA Solar holds BNEF Tier-1 bankable status and ranked #1 in the Wood Mackenzie Global Solar Module Manufacturer ranking for H1 2025 (score: 91.7/100) with annual output exceeding 80 GW. Manufacturer bankability reduces project finance risk and supports non-recourse debt financing for utility-scale PV farms.
The dual-glass construction weighs approximately 31.8 kg (2,333 × 1,134 × 30 mm), roughly 4-5 kg heavier than comparable single-glass modules at this power class. On industrial rooftops with structural load capacity below 15 kg/m², an engineering review is required before specifying this series.
The workmanship and materials warranty is 12 years - in line with the segment average, but below LONGi Solar's 15-year coverage on the Hi-MO X6 Explorer. For investors prioritizing execution risk mitigation over a 15-20-year horizon, this gap may serve as a valid negotiation point.
- At 22.5% efficiency, this panel is on par with typical TOPCon 550-600W modules
- At 224.9 W/m² power density, roof space requirements are typical for TOPCon 550-600W panels
- Temperature coefficient of -0.29%/°C matches the TOPCon 550-600W median
- At 32.5 kg (1.3 kg above TOPCon 550-600W median of 31.2 kg), requires checking roof load capacity
- Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof
Specifications
Datasheet charts
Measured curves published by JA Solar in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 595 Wp appear here. The rest cover the whole series.
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 JAM72D40 LB series
These answers cover the whole series. Where a figure differs, the specification above is this module's own.