--- title: "JA Solar JAM72D40-590/MB Solar Panel: Specs & Datasheet | ComparePV" description: "JA Solar JAM72D40-590/MB solar panel. Specs: 22.80% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ja-solar-jam72d40-590-mb" image: "https://comparepv.com/og/panel/ja-solar-jam72d40-590-mb.png" updated: 2026-09-11 --- # JA Solar JAM72D40-590/MB Space saver, no clear weak spot 1,022 panels in the segment TOPCon 550-600 W ## Identity - **Manufacturer:** JA Solar - **Model:** JAM72D40-590/MB - **Series:** JAM72D40 MB - **Rated power:** 590 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 550-600 W (1022 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 590 W | 580 W | Strong - top 18% | | | Module efficiency | 22.80% | 22.44% | Strong - top 22% | 2,769 | | Power density | 228.4 | 224.4 | Strong - top 17% | 2,653 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 | | Weight (kg) | 31.8 kg | 31.2 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.80% | 22.44% | Strong - top 22% | 2,769 | | Power density | 228.4 | 224.4 | Strong - top 17% | 2,653 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 | | Weight per kWp | 53.9 | 53.8 | Typical | 8,099 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **228.4 watts per square metre** - Top 17% of the TOPCon 550-600 W segment, against a median of 224.4. - **22.80% module efficiency** - Top 22% of the TOPCon 550-600 W segment, against a median of 22.44%. - **Best for:** Commercial, utility-scale, shaded-installations and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 590 W - **Efficiency:** 22.80 % - **Voltage at Pmax (Vmp):** 44.43 V - **Current at Pmax (Imp):** 13.28 A - **Open-circuit voltage (Voc):** 52.37 V - **Short-circuit current (Isc):** 13.94 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.045 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 144 - **Bifacial:** yes ### Physical - **Length:** 2278 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 31.8 kg - **Area:** 2.58 m2 - **Power density:** 228.4 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 516 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 2769 of 14129 | | Power density | 2653 of 14129 | | Temperature coefficient | 2220 of 14129 | | Weight | 8099 of 14129 | | Warranty | 21 of 14129 | ## Pros - **High module efficiency: 22.6-23.4%** - The series ranks significantly above two of the three peer comparables in the same power segment: JS Solar JS210MHC120 achieves 21.4% and LEDVANCE M585~605P60UB-SF-F3 only 21.37%, trailing by 1.2 pp and 2.0 pp respectively. Only GCL SIROT NT10/72GDF approaches this level (23.42%), confirming JAM72D40 MB's top-tier position among large-format 72-cell modules. - **N-type TOPCon: no LID, 0.4%/yr degradation** - N-type cell architecture eliminates LID caused by boron-oxygen complexes; the warranted annual degradation rate is 0.4%/year versus ~0.55%/year typical for PERC technology. The temperature coefficient of Pmax at approximately -0.30%/°C delivers more stable output under high-temperature conditions and variable irradiance. - **Bifacial glass-glass + 16BB half-cut** - The dual-glass bifacial design captures energy from reflected irradiance off ground surfaces - at albedo values of 15-40%, realistic bifacial gain in field conditions ranges from 5-15% without increasing array footprint. The 16-busbar half-cut architecture reduces resistive losses and improves partial-shading tolerance, beneficial for commercial rooftops and carport installations. - **30-year linear power warranty** - JA Solar warrants ≤0.4%/year degradation for 30 years, retaining >88% of nominal power at end of warranty. The market standard among peer comparables is 25 years - the 5-year advantage reduces financial risk and LCOE for commercial and utility-scale projects without requiring early module replacement. - **BNEF Tier-1 - manufacturer bankability** - JA Solar has maintained BNEF Tier-1 status for over a decade and qualifies for non-recourse project financing with major international banks. For commercial and utility-scale installations this translates to easier access to project finance and credible 30-year warranty enforcement over the full module lifecycle. ## Cons - **UVID - identified TOPCon technology risk** - NREL (PVRW 2025) and PVEL accelerated testing data show that over 50% of TOPCon modules exceed 5% power loss under UV-induced degradation (UVID) protocols. This risk applies to the entire N-type TOPCon technology class; unified IEC standards for UVID are still under development, and JA Solar has not publicly released UVID certification results for the JAM72D40 MB series. - **Weight 31.8 kg, large format 2278×1134 mm** - The glass-glass 72-cell construction results in a 31.8 kg module weight and 2278×1134×30 mm dimensions, requiring a minimum two-person installation crew and potentially limiting use on rooftops with restricted access or older structures with low load-bearing capacity. The series is impractical for small residential pitched-roof installations. ## About this series The JA Solar JAM72D40 MB series was designed to maximize energy yield in installations where every meter of structure counts. This is a **bifacial** module in **glass-glass** construction, capable of utilizing reflected light from light-colored surfaces, roof membranes, or snow, boosting energy production without increasing panel surface area. The **n-type cells (TOPCon / Bycium+)** feature extremely low degradation over time and more stable performance under real-world conditions - even with weaker sunlight or higher temperatures. An additional advantage is the **half-cut and multi busbar architecture**, which minimizes resistive losses and improves tolerance to partial shading, which is crucial for installations with obstacles and dense layouts. The JAM72D40 MB series is ideal for **PV farms, commercial installations, carports, and large flat roofs**, where energy yield, reliability, and lower energy cost over the installation's lifetime are top priorities. ## Notable figures - At 22.8% efficiency, this panel is on par with typical \*\*TOPCon 550-600W\*\* modules - Power density of 228.4 W/m² packs 4.0 W/m² more into the same footprint vs \*\*TOPCon 550-600W\*\* median (224.4 W/m²) - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 550-600W\*\* panels - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof - In the top 20% for efficiency among all TOPCon panels ## Questions ### What warranty does the JA Solar JAM72D40 MB come with and what does it cover? JA Solar provides a 12-year product warranty covering materials and workmanship, plus a 30-year linear power output warranty. After 30 years, the module retains at least 87.4% of its rated power. Degradation is specified at 1% in year one and only 0.4% per year thereafter, which is among the best figures available for n-type TOPCon modules currently on the market. ### Does the bifacial JAM72D40 MB make sense on a pitched roof, or is it only worth it for ground-mount systems? Bifacial gain is maximized when the rear side of the panel has access to reflected irradiance: white TPO flat roofs, light-colored ground surfaces, or carport structures. On a typical dark pitched roof, the bifacial contribution is modest (2-5%). However, the glass-glass construction itself adds mechanical durability and longer service life, which can independently justify choosing this series even when bifacial gain is marginal. ### What applications is the JAM72D40 MB series best suited for, and what are the module dimensions? The JAM72D40 MB is designed for utility-scale PV farms, commercial rooftop systems, carports, and large flat roofs. Module dimensions are 2278 × 1134 × 30 mm with a weight of approximately 31.8 kg. With up to 605 Wp per module, fewer units are required to reach a given system capacity, reducing BoS costs such as racking, cabling, and inverter inputs. The module is rated for 1500 V systems. ### How does the JAM72D40 MB perform in high temperatures, and does TOPCon really lose less power than PERC? The temperature coefficient of Pmax is -0.29%/°C, which outperforms standard PERC cells at approximately -0.35%/°C. At a module temperature of 60°C, the JAM72D40 MB loses proportionally less power than first-generation PERC panels. N-type TOPCon cells also exhibit lower light-induced degradation (LID), resulting in more stable energy yield throughout the system's operational lifetime. ### How does the TOPCon technology in the JAM72D40 MB differ from mainstream PERC cells? TOPCon (Tunnel Oxide Passivated Contact) is an n-type cell architecture with an additional passivation layer that suppresses carrier recombination. In practice, this yields higher module efficiency (up to 23.4% for the JAM72D40 MB vs. roughly 21-22% for PERC), lower annual degradation (0.4% vs. ~0.55%), and better low-light performance. The higher upfront cost is typically offset by a lower LCOE over a 25-to-30-year system lifetime. ### Is the large-format JAM72D40 MB module (approximately 32 kg) a problem for rooftop installation? At approximately 31.8 kg and 2278 × 1134 × 30 mm, the JAM72D40 MB is a commercial/utility-class module rather than a residential panel. For rooftop installation, a structural engineer should assess load-bearing capacity, and appropriately rated mounting systems must be used. The module is rated for snow loads up to 5400 Pa and wind loads up to 2400 Pa. Two-person crews or mechanical module lifters are recommended during installation. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/e55e142c0ae9638-d2e144d35875.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | -30 W, lighter, +2.0 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | +50 W, lighter, +2.0 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | -35 W, lighter, +1.8 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | +45 W, lighter, +1.8 pp | | [AIKO AIKO-A630-MAH72Dw](https://comparepv.com/panel/aiko-aiko-a630-mah72dw) | 630 W | +40 W, cooler, +1.6 pp | | [Longi Solar LR7-60HVHL-550M](https://comparepv.com/panel/longi-lr7-60hvhl-550m) | 550 W | -40 W, 16 kg lighter, +1.6 pp | | [JA Solar JAM72D30-525/MB/1500V](https://comparepv.com/panel/ja-solar-jam72d30-525-mb-1500v) | 525 W | -65 W, hotter, -2.5 pp | | [JA Solar JAM72S30-530/MR](https://comparepv.com/panel/ja-solar-jam72s30-530-mr) | 530 W | -60 W, hotter, -2.3 pp | | [JA Solar JAM72S30-535/MR](https://comparepv.com/panel/ja-solar-jam72s30-535-mr) | 535 W | -55 W, hotter, -2.1 pp | | [JA Solar JAM72S30-540/MR](https://comparepv.com/panel/ja-solar-jam72s30-540-mr) | 540 W | -50 W, hotter, -1.9 pp | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +60 W, lighter, +2.4 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +55 W, lighter, +2.2 pp | --- Source: https://comparepv.com/panel/ja-solar-jam72d40-590-mb Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.