--- title: "JA Solar JAM72D40-555/MB Solar Panel: Specs & Datasheet | ComparePV" description: "JA Solar JAM72D40-555/MB solar panel. Specs: 21.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ja-solar-jam72d40-555-mb-1" image: "https://comparepv.com/og/panel/ja-solar-jam72d40-555-mb-1.png" updated: 2026-09-11 --- # JA Solar JAM72D40-555/MB Middle of its segment, needs the roof space 1,022 panels in the segment TOPCon 550-600 W ## Identity - **Manufacturer:** JA Solar - **Model:** JAM72D40-555/MB - **Series:** DEEPBLUE 4.0X / JAM72D40 555-580/MB - **Rated power:** 555 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) | 555 W | 580 W | Weak - bottom 5% | | | Module efficiency | 21.50% | 22.44% | Weak - bottom 8% | 8,022 | | Power density | 214.8 | 224.4 | Weak - bottom 8% | 8,099 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,152 | | Weight (kg) | 31.8 kg | 31.2 kg | Weak - bottom 9% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.50% | 22.44% | Weak - bottom 8% | 8,022 | | Power density | 214.8 | 224.4 | Weak - bottom 8% | 8,099 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,152 | | Weight per kWp | 57.3 | 53.8 | Weak - bottom 9% | 11,240 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **214.8 watts per square metre** - Bottom 8% of the TOPCon 550-600 W segment, against a median of 224.4. Ranked 8,099th in the whole database. - **21.50% module efficiency** - Bottom 8% of the TOPCon 550-600 W segment, against a median of 22.44%. Ranked 8,022nd in the whole database. - **57.3 kg per kWp** - Bottom 9% of the TOPCon 550-600 W segment, against a median of 53.8. Ranked 11,240th in the whole database. - **Best for:** Commercial, utility-scale, hot-climate and shaded-installations. - **Not ideal for:** Roofs where every square metre has to count, tight roof space and weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 555 W - **Efficiency:** 21.50 % - **Voltage at Pmax (Vmp):** 42.24 V - **Current at Pmax (Imp):** 13.14 A - **Open-circuit voltage (Voc):** 50.55 V - **Short-circuit current (Isc):** 14.02 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.300 %/degC - **Temperature coefficient of Voc:** -0.260 %/degC - **Temperature coefficient of Isc:** 0.046 %/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:** 214.8 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:** 485 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 8022 of 14129 | | Power density | 8099 of 14129 | | Temperature coefficient | 6152 of 14129 | | Weight | 11240 of 14129 | | Warranty | 21 of 14129 | ## Pros - **N-type TOPCon - low LID and heat performance** - 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. - **Bifacial double-glass - 80% ±5% bifaciality** - 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. - **Up to 22.5% efficiency - segment-leading** - 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. - **BNEF Tier-1 bankable + 30-yr linear warranty ≥87.4%** - 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. ## Cons - **Series discontinued (2024)** - 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. - **12-year product warranty - below premium tier** - 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. ## About this series 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. ## Notable figures - Efficiency of 21.5% is 0.9pp below the \*\*TOPCon 550-600W\*\* median (22.4%) - 214.8 W/m² power density is 9.6 W/m² below \*\*TOPCon 550-600W\*\* median (224.4 W/m²) - requires larger installation area - At -0.30%/°C, hot weather performance is typical for \*\*TOPCon 550-600W\*\* panels - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface - Ranked #8022 out of 14129 panels for efficiency in the database ## Questions ### Is the JA Solar DEEPBLUE 4.0X / JAM72D40 555-580/MB series still available for purchase? The JAM72D40 555-580/MB series has been discontinued and is no longer actively marketed by JA Solar. It has been succeeded by the newer DeepBlue 4.0 Pro lineup (JAM72D40 580-605 W). If you specifically need this series, check distributor stock levels, but availability is limited and may deplete quickly. ### What warranty does JA Solar offer on the DEEPBLUE 4.0X JAM72D40-580/MB modules? JA Solar provides a 12-year product warranty covering material and workmanship defects, along with a 30-year linear power output warranty. After 30 years, the module is guaranteed to retain at least 87.4% of its rated power. Annual degradation after year one is just 0.4%, a direct benefit of n-type TOPCon cell technology compared to older PERC modules. ### How does the JAM72D40-580/MB perform in high-temperature conditions during summer? The temperature coefficient of Pmax is -0.29%/°C, which is significantly better than typical PERC modules at -0.34 to -0.36%/°C. In practice, this means lower power losses on hot days and a higher annual energy yield. The advantage is especially relevant for installations in warm climates or rooftop arrays with limited airflow under the modules. ### What does bifacial mean for the DEEPBLUE 4.0X, and does it make sense for my installation? Bifacial means the module generates power from both its front and rear surfaces by capturing light reflected off the ground or mounting surface (albedo). In ground-mount or carport installations with a light-colored surface, rear-side gains typically range from 5-15%. On dark-colored rooftops the bifacial effect is minimal due to low albedo. Maximum benefit requires a properly selected surface beneath the modules. ### How does TOPCon cell technology in the JAM72D40 compare to older PERC cells? TOPCon (Tunnel Oxide Passivated Contact) is an n-type cell architecture with higher conversion efficiency and significantly lower light-induced degradation (LID) than PERC. This means the module produces proportionally more energy over its full service life. The lower first-year degradation rate and better temperature coefficient both contribute to improved LCOE over a long investment horizon. ### Are JAM72D40-580/MB modules suitable for large industrial rooftops and carports? Yes, those are among the primary target applications for this series. The 580 Wp peak power combined with bifacial double-glass construction enables higher power density per unit area, which directly reduces the BoS (balance of system) cost per kWh. The glass-glass structure also provides superior resistance to mechanical loads, moisture ingress, and microcracks - critical factors in large commercial and carport installations. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/20230311053201133-b53475153eb1.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, lighter, +3.5 pp | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, lighter, +3.3 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, lighter, +3.2 pp | | [WINAICO WST-505BKX54-A2](https://comparepv.com/panel/winaico-wst-505bkx54-a2) | 505 W | -50 W, lighter, +3.2 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | Cooler, lighter, +3.1 pp | | [Longi Solar LR7-60HVHL-550M](https://comparepv.com/panel/longi-lr7-60hvhl-550m) | 550 W | Cooler, 16 kg lighter, +2.9 pp | | [JA Solar JAM72D30-525/MB/1500V](https://comparepv.com/panel/ja-solar-jam72d30-525-mb-1500v) | 525 W | -30 W, hotter, -1.2 pp | | [JA Solar JAM72S30-530/MR](https://comparepv.com/panel/ja-solar-jam72s30-530-mr) | 530 W | Hotter, -1.0 pp, -5 yr warranty | | [JA Solar JAM72S30-535/MR](https://comparepv.com/panel/ja-solar-jam72s30-535-mr) | 535 W | Hotter, lighter, -5 yr warranty | | [JA Solar JAM72S30-540/MR](https://comparepv.com/panel/ja-solar-jam72s30-540-mr) | 540 W | Hotter, lighter, -5 yr warranty | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +95 W, lighter, +3.7 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +90 W, lighter, +3.5 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | +85 W, lighter, +3.3 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | +80 W, lighter, +3.1 pp | | [AIKO AIKO-A630-MAH72Dw](https://comparepv.com/panel/aiko-aiko-a630-mah72dw) | 630 W | +75 W, cooler, +2.9 pp | --- Source: https://comparepv.com/panel/ja-solar-jam72d40-555-mb-1 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.