--- title: "JA Solar JAM72S20-450/MR 450W Solar Panel - Specs & Review | ComparePV" description: "JA Solar JAM72S20-450/MR 450W solar panel. Specs: 20.30% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ja-solar-jam72s20-450-mr-1" updated: 2026-09-11 --- # JA Solar JAM72S20-450/MR Middle of its segment, needs the roof space 449 panels in the segment PERC 450-500 W ## Identity - **Manufacturer:** JA Solar - **Model:** JAM72S20-450/MR - **Series:** JAM72S20 445-470/MR Series - **Rated power:** 450 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 450-500 W (449 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 450 W | 460 W | Weak - bottom 12% | | | Module efficiency | 20.30% | 20.82% | Weak - bottom 9% | 11,769 | | Power density | 202.5 | 208.5 | Weak - bottom 8% | 11,847 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,419 | | Weight (kg) | 24.5 kg | 24.5 kg | Typical | | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.30% | 20.82% | Weak - bottom 9% | 11,769 | | Power density | 202.5 | 208.5 | Weak - bottom 8% | 11,847 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,419 | | Weight per kWp | 54.4 | 53.1 | Typical | 8,755 | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Watch out for - **202.5 watts per square metre** - Bottom 8% of the PERC 450-500 W segment, against a median of 208.5. Ranked 11,847th in the whole database. - **20.30% module efficiency** - Bottom 9% of the PERC 450-500 W segment, against a median of 20.82%. Ranked 11,769th in the whole database. - **Best for:** Commercial and shaded-installations. - **Not ideal for:** Roofs where every square metre has to count and tight roof space. ## Specification ### Electrical - **Rated power (Pmax):** 450 W - **Efficiency:** 20.30 % - **Voltage at Pmax (Vmp):** 41.52 V - **Current at Pmax (Imp):** 10.84 A - **Open-circuit voltage (Voc):** 49.70 V - **Short-circuit current (Isc):** 11.36 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.350 %/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:** 144 ### Physical - **Length:** 2112 mm - **Width:** 1052 mm - **Thickness:** 35 mm - **Weight:** 24.5 kg - **Area:** 2.22 m2 - **Power density:** 202.5 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 84.8 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.55 % - **Output after 30 years:** 369 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 11769 of 14005 | | Power density | 11847 of 14005 | | Temperature coefficient | 10419 of 14005 | | Weight | 8755 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **BNEF Tier 1 manufacturer — bankability** - JA Solar (founded 2005) has maintained consistent BNEF Tier 1 bankable status and exceeds 80 GW of annual module production. Tier 1 classification directly facilitates non-recourse project financing for commercial and utility-scale ground-mount assets, reducing the weighted cost of capital. - **MBB + half-cut PERC — lower losses and hot-spot risk** - Multi-Busbar architecture shortens electron travel paths, cutting resistive losses. Splitting into 144 half-cut cells halves internal current, reducing thermal stress, hot-spot risk, and improving partial-shading tolerance versus conventional 72-cell full-cell modules. - **Temperature coefficient of -0.35%/°C** - A Pmax temperature coefficient (γPmax) of -0.35%/°C places this module in the top quartile of the PERC class (typical segment range: -0.36% to -0.40%/°C), delivering measurably higher annual yield in continental climates compared to PERC peers with inferior temperature response. - **IEC 61215 / IEC 61730 certification and PID resistance** - The series carries IEC 61215 (durability) and IEC 61730 (safety) certifications and declared PID resistance. PID immunity is a critical requirement for long DC strings used in commercial and utility ground-mount systems operating above 1000 V. ## Cons - **Efficiency 20–21.2% vs. 23.52% in peer comparables** - Direct peers at the same power class — Recom Lynx 470 Wp and Sunlike Solar SKT470 — achieve 23.52% module efficiency, outperforming this series by 2.3–3.5 percentage points. On a fixed footprint, this gap translates to roughly 11–17% more power output, materially worsening LCOE in space-constrained projects. - **PERC degradation rate higher than TOPCon** - 2025 PVEL data and industry benchmarks indicate PERC cells degrade at approximately 0.5–0.8%/year versus ~0.25–0.4%/year for TOPCon N-type. The 84.8% linear power warranty after 25 years is the PERC-class standard but trails modern N-type TOPCon offerings, which now account for ~65% of global module production. - **Monofacial design in a bifacial ground-mount era** - The series is non-bifacial despite being positioned for utility-scale ground-mount installations where bifacial modules typically deliver 5–15% additional annual energy yield from albedo reflection, reducing this series' competitiveness against newer products in the same watt-class. ## About this series JAM72S20 445-470/MR series modules are based on an innovative architecture using **PERC half-cut cells**, which directly translates to higher energy efficiency while simultaneously lowering the operating temperature of individual cells. The **Multi-Busbar (MBB) technology** used in this series shortens the electron flow path, effectively minimizing resistive losses and significantly increasing the module's resistance to micro-cracks during many years of operation in varying weather conditions. This series effectively solves the problem of drastic power drops resulting from partial shading of the module surface, offering investors **reduced sensitivity to shading** thanks to the completely independent operation of the panel's upper and lower sections. It is a solution dedicated primarily to large-scale commercial projects and ground-mounted photovoltaic farms, where a quick return on investment and maximum power density from the available area are of key importance. What distinguishes this product line from standard market solutions is its **increased mechanical strength** against snow and wind loads as well as exceptional resistance to potential-induced degradation (PID). This guarantees stable electricity production even in extreme environmental conditions. The robust design combined with an optimized temperature coefficient makes these panels work much more efficiently on hot days than competing products of similar power. ## Notable figures - At 20.3% efficiency, this panel is 0.5pp below the \*\*PERC 450-500W\*\* median of 20.8% - 202.5 W/m² power density is 6.0 W/m² below \*\*PERC 450-500W\*\* median (208.5 W/m²) - requires larger installation area - At -0.35%/°C, hot weather performance is typical for \*\*PERC 450-500W\*\* panels - In the top 84% for efficiency among all PERC panels ## Questions ### What is the warranty on JA Solar JAM72S20 445-470/MR panels? The JAM72S20 445-470/MR series comes with a 12-year product warranty covering material and workmanship defects. In addition, JA Solar provides a 25-year linear power warranty guaranteeing at least 84.8% of nominal output after 25 years, with a minimum of 98% power retained after the first year. These are standard warranty terms for Tier 1 JA Solar modules. ### Are the JAM72S20 445-470/MR panels suitable for large-scale commercial and utility-scale PV projects? Yes, this series is designed specifically for utility-scale ground-mount and large commercial PV installations. With peak power up to 470 Wp and module efficiency around 20.7%, it delivers high power density per available area. The large module dimensions of 2112×1052 mm and weight of 24.5 kg require professional mounting equipment, making it a less practical choice for residential rooftop installations. ### What are the practical benefits of Multi-Busbar (MBB) technology and half-cut PERC cells in the JAM72S20 445-470/MR? Multi-Busbar technology shortens the electron path, reducing resistive losses and improving long-term resistance to microcracks. The half-cut PERC cell design (144 cells instead of 72) splits the module into two independent upper and lower sections. This means partial shading of one section does not shut down the entire panel. The result is higher efficiency, lower risk of hot spots, and reduced long-term power degradation. ### Do JA Solar JAM72S20 445-470/MR panels lose significant power output on hot days? The temperature coefficient of Pmax for this series is -0.35%/°C, meaning output drops by 0.35% for every degree Celsius above 25°C (STC). This is competitive among PERC modules. The half-cut cell architecture also lowers operating cell temperature, which in real-world conditions translates to higher energy yield compared to conventional full-cell modules with similar nominal power ratings. ### How well does the JAM72S20 445-470/MR handle partial shading from chimneys or adjacent panel rows? The half-cut cell design splits the module into two electrically independent sections, significantly reducing shading losses. If a shadow falls only on the lower half, the upper section continues operating at full capacity. This is especially valuable in ground-mount arrays where low winter sun angles cause inter-row shading. For rooftop installations with multiple linear obstacles, pairing with power optimizers or microinverters can provide additional yield gains. ### How do the JAM72S20 445-470/MR modules perform under mechanical stress and extreme weather conditions? The JAM72S20 445-470/MR series features enhanced mechanical resistance, typically certified to withstand snow loads up to 5400 Pa and wind pressure up to 2400 Pa. Modules are tested for resistance to potential-induced degradation (PID), protecting system performance in high-voltage string configurations. The anodized aluminum frame provides long-term corrosion resistance, making this series suitable for demanding outdoor environments. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/JAM72S20-MR-f796e8e2f890.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Cooler, +4.5 pp, +5 yr warranty | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | Cooler, +4.2 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +50 W, cooler, +4.2 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +50 W, cooler, +4.2 pp | | [Gokin GK-3-54HGb-500M](https://comparepv.com/panel/gokin-gk-3-54hgb-500m) | 500 W | +50 W, cooler, +4.2 pp | | [GCL GCL-NR10R/54BGDF](https://comparepv.com/panel/gcl-gcl-nr10r-54bgdf) | 500 W | +50 W, cooler, +4.2 pp | | [JA Solar MYM6144-430](https://comparepv.com/panel/ja-solar-mym6144-430) | 430 W | -20 W, hotter, -0.8 pp | | [JA Solar JAM72D20-435/MB/1500V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam72d20-435-mb-1500v) | 435 W | Heavier, -0.8 pp, +5 yr warranty | | [JA Solar MYM6144-435](https://comparepv.com/panel/ja-solar-mym6144-435) | 435 W | -15 W, hotter, -0.6 pp | | [JA Solar JAM72D20-440/MB/1500V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam72d20-440-mb-1500v) | 440 W | Heavier, -0.5 pp, +5 yr warranty | | [JA Solar MYM6144-440](https://comparepv.com/panel/ja-solar-mym6144-440) | 440 W | Hotter, heavier, -0.4 pp | | [JA Solar JAM72S20-445/MR](https://comparepv.com/panel/ja-solar-jam72s20-445-mr-1) | 445 W | -0.3 pp | | [JA Solar JAM72D20-445/MB/1500V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam72d20-445-mb-1500v) | 445 W | Heavier, -0.3 pp, +5 yr warranty | | [JA Solar MYM6144-445](https://comparepv.com/panel/ja-solar-mym6144-445) | 445 W | Hotter, heavier | | [JA Solar JAM72D20-450/MB/1500V](https://comparepv.com/panel/shanghai-ja-solar-technology-co-ltd-jam72d20-450-mb-1500v) | 450 W | Heavier, +5 yr warranty | | [Gamko New Energy GKA120N-PRO-590W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-590w) | 590 W | +140 W, +3.5 pp, +5 yr warranty | --- Source: https://comparepv.com/panel/ja-solar-jam72s20-450-mr-1 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.