--- title: "JA Solar JAM66D10-375/MB/1500V Solar Panel: Specs & Datasheet | ComparePV" description: "JA Solar JAM66D10-375/MB/1500V solar panel. Specs: 19.90% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam66d10-375-mb-1500v" image: "https://comparepv.com/og/panel/shanghai-ja-solar-technology-co-ltd-jam66d10-375-mb-1500v.png" updated: 2026-09-11 --- # JA Solar JAM66D10-375/MB/1500V Warranty pick, heavy for its output 579 panels in the segment PERC 350-400 W ## Identity - **Manufacturer:** JA Solar - **Model:** JAM66D10-375/MB/1500V - **Series:** JAM66D10 360-380/MB/1500V Series - **Rated power:** 375 W - **Cell technology:** PERC - **Bifacial:** yes ## How it compares Compared against segment PERC 350-400 W (579 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 375 W | 380 W | Typical | | | Module efficiency | 19.90% | 19.90% | Typical | 12,416 | | Power density | 199.2 | 199.0 | Typical | 12,388 | | Temperature coefficient | -0.354 | -0.350 | Typical | 12,365 | | Weight (kg) | 24.5 kg | 21.4 kg | Weak - bottom 12% | | | Performance warranty | 30 yrs | 25 yrs | Strong - top 13% | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 19.90% | 19.90% | Typical | 12,416 | | Power density | 199.2 | 199.0 | Typical | 12,388 | | Temperature coefficient | -0.354 | -0.350 | Typical | 12,365 | | Weight per kWp | 65.3 | 55.8 | Weak - bottom 12% | 13,178 | | Performance warranty | 30 yrs | 25 yrs | Strong - top 13% | 21 | ### Strengths - **30 year performance warranty** - Top 13% of the PERC 350-400 W segment, against a median of 25 yrs. ### Watch out for - **65.3 kg per kWp** - Bottom 12% of the PERC 350-400 W segment, against a median of 55.8. - **Best for:** Commercial and shaded-installations. - **Not ideal for:** Weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 375 W - **Efficiency:** 19.90 % - **Voltage at Pmax (Vmp):** 37.88 V - **Current at Pmax (Imp):** 9.90 A - **Open-circuit voltage (Voc):** 45.38 V - **Short-circuit current (Isc):** 10.41 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.354 %/degC - **Temperature coefficient of Voc:** -0.272 %/degC - **Temperature coefficient of Isc:** 0.044 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 132 - **Bifacial:** yes ### Physical - **Length:** 1873 mm - **Width:** 1005 mm - **Thickness:** 35 mm - **Weight:** 24.5 kg - **Area:** 1.88 m2 - **Power density:** 199.2 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 83.0 % - **First-year degradation:** 2.50 % - **Annual degradation:** 0.50 % - **Output after 30 years:** 311 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 12416 of 14129 | | Power density | 12388 of 14129 | | Temperature coefficient | 12365 of 14129 | | Weight | 13178 of 14129 | | Warranty | 21 of 14129 | ## Pros - **Bifacial double-glass construction** - The bifacial double-glass design harvests reflected irradiance from the ground surface, typically delivering 5-15% additional energy yield compared to monofacial modules in ground-mount and ballasted rooftop installations. The glass-glass laminate replaces the rear EVA backsheet, significantly improving moisture barrier performance and reducing PID-related degradation over time. - **Multi busbar (MB) technology** - Multiple thin busbars shorten the current path within each cell, lowering series resistance and reducing the mechanical stress that causes microcracks during transport and under dynamic wind/snow loads. This directly supports long-term reliability across the 30-year operational period. - **1500 V system voltage rating** - The 1500 V certification enables longer DC strings - roughly 25-30% more modules per string than 1000 V systems - which reduces BoS costs through fewer MC4 connectors, smaller cable cross-sections, and lower DC wiring runs. The benefit scales with system size, making it particularly relevant for commercial and utility-scale installations. - **JA Solar - BNEF Tier-1 bankable manufacturer** - JA Solar maintains a continuous presence on BloombergNEF's Tier-1 module manufacturer list, demonstrating non-recourse project financing by at least six independent banks. Tier-1 bankable status lowers the cost of capital (LCOE) for financed projects and provides institutional investors with confidence in the warranty guarantor's solvency over a 30-year horizon. - **Half-cut PERC cells - 132-cell layout** - The half-cut 132-cell PERC layout splits the module into two electrically independent halves, reducing partial-shading losses and cutting the per-cell Isc by ~50%. The temperature coefficient of Pmax at -0.354%/°C outperforms typical full-cell PERC modules (-0.38% to -0.45%/°C), translating into measurably higher summer energy yield. ## Cons - **Discontinued series (EOL 2022)** - The JAM66D10 series was manufactured from 2020 to 2022 and has been officially discontinued. This limits availability of new modules for system expansion or replacement, removes active series-level technical support, and creates a practical risk of being unable to source identical modules if individual units are damaged years into the installation's service life. - **Efficiency below current peer comparables** - Peak module efficiency tops out at 20.2%, while peer comparables in the same power class (380 Wp) achieve 20.8% (VDS-S120/M6H) and 20.85% (Gamko GKA166M120 360-380W). The 0.6-0.65 percentage point gap translates to approximately 3% more roof or field area required to achieve the same installed capacity. - **Power warranty floor of 83% after 30 years** - The JAM66D10 datasheet guarantees a minimum of 83% of nominal power output after 30 years. Newer JA Solar series (e.g., JAM66D46, 2023) warrant ≥87.4% at 30 years at ≤0.4%/year linear degradation - a 4.4 percentage point difference that accumulates into meaningfully higher lifetime energy production. - **PERC technology limitations vs. TOPCon/HJT** - P-type PERC cells exhibit higher light-induced degradation (LID/LeTID) rates and less favorable temperature coefficients compared to N-type TOPCon and HJT technologies, which have been widely available at comparable price points since 2022. For installations with a 25-30 year horizon, selecting a newer cell technology may offer a better long-term LCOE outcome. ## About this series The JA Solar JAM66D10 360-380/MB/1500V series is engineered for reliable energy production in installations where predictable yields and trouble-free operation are key. The application of **bifacial construction with dual glass** allows for better utilization of reflected light from the ground, enhancing energy output particularly on light-colored roofs, weighted structures, and ground-mounted systems. The **monocrystalline PERC cells** in a half-cell configuration improve module performance under partial shading and reduce heat-related losses, which is crucial during summer months and on roofs with poor ventilation. The **multi busbar** technology helps increase connection reliability and minimizes the risk of micro-cracks during transportation and operation in windy and snowy conditions. The high system voltage of **1500 V** facilitates longer string designs and reduces cabling costs in large-scale projects. This is an excellent choice for installers and investors seeking a durable, versatile, and predictable module for long-term applications. ## Notable figures - Efficiency of 19.9% matches the \*\*PERC 0-400W\*\* median - Power density of 199.2 W/m² packs 5.0 W/m² more into the same footprint vs \*\*PERC 0-400W\*\* median (194.2 W/m²) - Temperature coefficient of -0.35%/°C matches the \*\*PERC 0-400W\*\* median - Weight of 24.5 kg is 4.0 kg above \*\*PERC 0-400W\*\* median (20.5 kg) - verify structural support - Bifacial design (70% factor) captures reflected light - adds 4-10% yield on ground-mount or white roof ## Questions ### Is the JA Solar JAM66D10 360-380/MB/1500V series still available for purchase? The JAM66D10 360-380/MB/1500V series has been discontinued and is no longer produced by JA Solar. Some units may still be available from distributors clearing remaining stock. If you are looking for a comparable bifacial PERC module from the same manufacturer, it is worth asking about newer series that offer higher wattages and updated specifications. ### What warranty does the JA Solar JAM66D10 360-380/MB/1500V come with? JA Solar provides a 12-year product warranty covering defects in materials and workmanship, along with a 30-year linear power output warranty. Over that period, the module is guaranteed to retain at least 83% of its rated power. These are standard Tier 1 warranty terms, offering long-term reliability assurance for investors with extended payback horizons. ### What does bifacial mean on the JAM66D10 and does it actually generate more energy? A bifacial module has active PERC cells on both sides of the glass, capturing direct irradiance on the front and albedo-reflected light on the rear. The JAM66D10 uses a dual-glass construction instead of a backsheet. Real-world energy gain depends on ground albedo: on light-colored gravel or concrete surfaces, you can typically expect a few percentage points of additional annual yield compared to a standard monofacial module. ### Do the JAM66D10 360-380/MB/1500V panels perform well under partial shading, for example from a chimney? Yes, the half-cut cell layout across 132 monocrystalline PERC cells reduces power losses under partial shading. Splitting each cell in half lowers internal resistance and limits the impact of shade on the entire string. That said, it does not replace power optimizers or microinverters in cases of heavy, recurring shading from trees or antennas. ### Does the 1500 V system voltage of the JAM66D10 series matter for a residential rooftop installation? The 1500 V system voltage is primarily relevant for commercial and utility-scale ground-mounted systems above several dozen kilowatts. It enables longer strings with fewer home-run cables, reducing BoS costs. For a typical residential system up to 10-15 kWp, the practical impact is limited, but compatibility with 1500 V inverters does provide flexibility for future system expansion. ### How heavy is the JAM66D10 380W module and is rooftop installation difficult? The module weighs approximately 24.5 kg, which is typical for a dual-glass bifacial panel of this size (roughly 1873×1005 mm). Installation generally requires two workers to carry the panel up to the roof. The double-glass construction adds rigidity but also weight, so it is advisable to verify roof load capacity before installation, especially on older buildings. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/20200619043544292-759279c7e55d.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [JA Solar NS-330MH-80](https://comparepv.com/panel/ja-solar-ns-330mh-80) | 330 W | Cooler, lighter, +3.2 pp | | [PolyCrown Solar Tech NS-330MH-80](https://comparepv.com/panel/polycrown-solar-tech-ns-330mh-80) | 330 W | Cooler, lighter, +3.2 pp | | [Gamko New Energy GKA210M340W](https://comparepv.com/panel/gamko-new-energy-gka210m340w) | 340 W | -35 W, lighter, +3.1 pp | | [Gamko New Energy GKA210M360W](https://comparepv.com/panel/gamko-new-energy-gka210m360w) | 360 W | -15 W, lighter, +3.1 pp | | [Gamko New Energy GKA210M380W (1/4\*4\*38)](https://comparepv.com/panel/gamko-new-energy-gka210m380w-1-4-4-38) | 380 W | Lighter, +3.1 pp | | [Gamko New Energy GKA210M400W (1/2\*4\*20)](https://comparepv.com/panel/gamko-new-energy-gka210m400w-1-2-4-20) | 400 W | +25 W, lighter, +3.1 pp | | [Gamko New Energy GKA210M400W (1/4\*4\*40)](https://comparepv.com/panel/gamko-new-energy-gka210m400w-1-4-4-40) | 400 W | +25 W, lighter, +3.1 pp | | [Gamko New Energy GKA210M380W (1/2\*4\*19)](https://comparepv.com/panel/gamko-new-energy-gka210m380w-1-2-4-19) | 380 W | Lighter, +3.1 pp | | [Maxeon SPR-MAX3-400-COM](https://comparepv.com/panel/maxeon-spr-max3-400-com) | 400 W | Cooler, +2.7 pp, +10 yr warranty | | [Maxeon SPR-MAX3-425-R](https://comparepv.com/panel/maxeon-spr-max3-425-r) | 425 W | Cooler, +2.5 pp, +10 yr warranty | | [JA Solar JAM66D10-360/MB/1500V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam66d10-360-mb-1500v) | 360 W | -15 W, -0.8 pp | | [JA Solar JAM66D10-365/MB/1500V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam66d10-365-mb-1500v) | 365 W | -10 W, -0.5 pp | | [JA Solar JAM66D10-370/MB/1500V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam66d10-370-mb-1500v) | 370 W | Very close match | | [JA Solar JAM66D10-380/MB/1500V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam66d10-380-mb-1500v) | 380 W | +0.3 pp | | [Maxeon SPR-MAX7-475](https://comparepv.com/panel/maxeon-spr-max7-475) | 475 W | +100 W, +4.1 pp, +10 yr warranty | | [Maxeon SPR-MAX7-470](https://comparepv.com/panel/maxeon-spr-max7-470) | 470 W | +95 W, +3.8 pp, +10 yr warranty | --- Source: https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam66d10-375-mb-1500v Not in this file, on the page: a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.