Warranty pick, heavy for its output
The JA Solar JAM78D10 430-450/MB/1500V series is designed for installations where high energy yield on limited space and predictable performance over years are key priorities. These are bifacial modules, capable of harnessing not only direct radiation but also reflected light from the ground-particularly effective on light-colored roofs, ground-mounted structures, and projects where optimizing output beyond the panel's front side is planned. The architecture featuring mono PERC cells supports stable performance under typical operating conditions, while the 1500V concept facilitates longer strings and reduces losses in larger systems.
In practice, this series addresses a common challenge for investors: how to increase yield without adding more rows of panels. It is also distinguished by its focus on long-term degradation and operational durability, which is crucial for PV farms, large commercial roofs, and projects targeting a predictable LCOE. This makes the JAM78D10 a viable alternative to single-sided panels when you aim to squeeze more out of the same location.
Ranking
Signals from the data
Commercial.
Weight-limited structures, tight roof space and roofs where every square metre has to count.
Top 17% of the PERC 400-450 W segment, against a median of 25 yrs.
Bottom 1% of the PERC 400-450 W segment, against a median of 53.0. Ranked 13,360th in the whole database.
Bottom 5% of the PERC 400-450 W segment, against a median of 20.60%. Ranked 12,751st in the whole database.
Bottom 5% of the PERC 400-450 W segment, against a median of 206.2. Ranked 12,768th in the whole database.
The module captures diffuse and reflected irradiance through its transparent rear glass. Bifacial gain in typical ground-mounted systems is 10-15%, rising to 25-30% on high-albedo surfaces (white gravel, snow), directly reducing LCOE without increasing the land footprint.
1500 V compatibility allows longer strings (more modules per MPPT input), reducing cable runs, connectors, and inverter count in utility-scale and large commercial rooftop systems. The result is a measurable reduction in Balance of System costs per installed kWp.
JA Solar has maintained BNEF Tier-1 bankable status continuously, with manufacturing capacity exceeding 100 GWp/year and acceptance by major project finance lenders. Tier-1 status reduces financing risk when securing debt for utility-scale PV projects.
The manufacturer guarantees power output for 30 years, surpassing the typical 25-year industry standard offered by many mid-range competitors. The extended warranty horizon directly improves financial model predictability and LCOE calculations for commercial installations.
The JAM78D10 series was manufactured from 2020 to 2022 and has been officially discontinued. New module availability is limited to distributor warehouse stock, making warranty replacements and future system expansions with identical modules difficult to guarantee.
At the same rated power of 430 Wp, peer comparable VSUN N-108MH-BW achieves 22.02% efficiency, SunLink SL5M108 reaches 22%, and Silfab Elite hits 21.4%. The 1.9-2.5 percentage-point gap means JAM78D10 requires approximately 9-12% more roof or land area to deliver the same installed capacity.
Mono PERC (P-type) cells exhibit Light-Induced Degradation (LID) of 1-3% within the first hours of light exposure and annual degradation of ~0.6-0.8% per PVEL 2025 data. N-type TOPCon modules, which already represent ~65% of global shipments as of Q1 2026, have no LID mechanism and degrade at 0.4-0.5%/year, delivering measurably higher lifetime energy yield.
- At 19.5% efficiency, this panel is 1.1pp below the PERC 400-450W median of 20.6%
- At 194.7 W/m², this panel generates 11.5 W/m² less per unit area than PERC 400-450W median (206.2 W/m²)
- Temperature coefficient of -0.35%/°C matches the PERC 400-450W median
- Weight of 29.0 kg is 7.0 kg above PERC 400-450W median (22.0 kg) - verify structural support
- Bifacial design (70% factor) captures reflected light - adds 4-10% yield on ground-mount or white roof
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 6 panels of the same or similar size to this one, within ±10 mm. See them here Found 12 panels of the same or similar size to this one, within ±25 mm. See them here Found 26 panels of the same or similar size to this one, within ±50 mm. See them here Found 227 panels of the same or similar size to this one, within ±100 mm. See them here
About the JAM78D10 430-450/MB/1500V Series series
These answers cover the whole series. Where a figure differs, the specification above is this module's own.