--- title: "JA Solar JAM72S40-605/LR 605W Solar Panel - Specs & Review | ComparePV" description: "JA Solar JAM72S40-605/LR 605W solar panel. Specs: 22.90% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ja-solar-jam72s40-605-lr" updated: 2026-09-11 --- # JA Solar JAM72S40-605/LR Light for its output, short guarantee 1,086 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** JA Solar - **Model:** JAM72S40-605/LR - **Series:** JAM72S40 LR - **Rated power:** 605 W - **Cell technology:** TOPCon ## How it compares Compared against segment TOPCon 600-650 W (1086 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 605 W | 620 W | Weak - bottom 15% | | | Module efficiency | 22.90% | 22.80% | Typical | 2,359 | | Power density | 228.7 | 227.7 | Typical | 2,452 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 24.3 kg | 32.7 kg | Strong - top 1% | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 3% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.90% | 22.80% | Typical | 2,359 | | Power density | 228.7 | 227.7 | Typical | 2,452 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 40.2 | 53.1 | Strong - top 1% | 160 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 3% | 9,798 | ### Strengths - **40.2 kg per kWp** - Top 1% of the TOPCon 600-650 W segment, against a median of 53.1. Ranked 160th in the whole database. ### Watch out for - **25 year performance warranty** - Bottom 3% of the TOPCon 600-650 W segment, against a median of 30 yrs. Ranked 9,798th in the whole database. - **Best for:** Commercial, utility-scale, shaded-installations and hot-climate. - **Not ideal for:** Owners who want a long output guarantee. ## Specification ### Electrical - **Rated power (Pmax):** 605 W - **Efficiency:** 22.90 % - **Voltage at Pmax (Vmp):** 43.94 V - **Current at Pmax (Imp):** 13.77 A - **Open-circuit voltage (Voc):** 52.60 V - **Short-circuit current (Isc):** 14.53 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 ### Physical - **Length:** 2333 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 24.3 kg - **Area:** 2.65 m2 - **Power density:** 228.7 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 87.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 529 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 2359 of 14005 | | Power density | 2452 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 160 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **N-type TOPCon technology** - N-type cells deliver a lower temperature coefficient of Pmax (-0.30%/°C vs. typical -0.35%/°C for PERC), resulting in higher real-world energy yield on hot days. TOPCon also significantly reduces LID degradation inherent to P-type cell architectures. - **Efficiency 21.9–22.9% — above two of three peers** - The series outperforms both JS Solar JS210MHC120 (21.4%) and LEDVANCE M585~605P60UB (21.37%) by approximately 1.5 pp, delivering better power density per unit of roof area — a key advantage on constrained commercial and industrial rooftops. - **BNEF Tier-1 bankable manufacturer** - JA Solar maintains BNEF Tier-1 status (confirmed Q1 2026) with global manufacturing capacity exceeding 100 GW/year. This minimizes counterparty risk in non-recourse project financing and simplifies insurance and due-diligence requirements. - **Half-cut cell architecture** - Splitting cells in half reduces resistive losses and improves partial-shading resilience, making the module well-suited for commercial rooftops with common obstructions such as skylights, parapets, HVAC units, and antennas. ## Cons - **Monofacial design** - Unlike the GCL SIROT NT10/72GDF — a bifacial N-type module in the same power class (580–605 Wp) — the JAM72S40 LR does not harvest rear-side reflected irradiance. Bifacial modules typically yield 5–15% more annual energy in ground-mount and white-membrane rooftop installations, directly improving LCOE. - **Peak efficiency 22.9% vs. 23.42% segment leader** - The 0.52 pp efficiency gap vs. GCL SIROT NT10/72GDF requires approximately 2.3% more modules to achieve the same peak installed capacity — a meaningful constraint in area-limited projects. - **25-year linear power warranty vs. 30-year competitor** - GCL SIROT NT10/72GDF backs its modules with a 30-year power warranty guaranteeing ≥87.4% of Pnom; JAM72S40 LR covers 25 years. The 5-year gap can be a disqualifying factor in long-horizon financing structures such as PPA agreements, 20–25-year leases, or ESCO contracts. ## About this series The JA Solar JAM72S40 LR series was designed for maximum energy yield in installations where high power density and stable operation in variable conditions are key. The modules are based on the **half-cell** architecture, effectively reducing resistive losses and improving performance under partial shading - important for rooftop systems, commercial buildings, or installations with obstacles (skylights, attics, HVAC systems). An additional advantage is **lower temperature sensitivity**, meaning energy production decreases less in hot weather, and the installation actually generates more during the summer season. The JAM72S40 LR is the choice for investors seeking to optimize energy costs throughout the system's entire lifecycle - hence the emphasis on **high efficiency and long-term parameter stability** as well as the refined structure designed for demanding projects. This series performs excellently in commercial, industrial, and rooftop installations, where fast mounting, reliable performance, and **better energy yield from the same surface** compared to many standard modules are crucial. ## Notable figures - At 22.9% efficiency, this panel is on par with typical \*\*TOPCon 600-650W\*\* modules - At 228.7 W/m² power density, roof space requirements are typical for \*\*TOPCon 600-650W\*\* panels - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 600-650W\*\* panels - Weight of 24.3 kg (8.4 kg below \*\*TOPCon 600-650W\*\* median of 32.7 kg) allows easier transport and roof mounting - In the top 17% for efficiency among all TOPCon panels ## Questions ### What is the maximum output power and efficiency of JA Solar JAM72S40 LR panels? The JAM72S40 LR series reaches a peak power of 605 Wp with module efficiency of up to approximately 21.6%. These figures are driven by TOPCon cell technology combined with a half-cut architecture, which reduces resistive losses and boosts per-cell performance. This makes the series one of the more efficient options in the 72-cell format for commercial and industrial PV installations. ### What warranty does the JA Solar JAM72S40 LR series come with? JA Solar provides a 12-year product warranty and a 25-year linear power warranty for the JAM72S40 LR series. Over that period, the module is guaranteed to retain roughly 84–87% of its rated output. As a Tier 1 manufacturer, JA Solar offers reliable after-sales support and stable long-term service availability throughout the investment lifecycle. ### Will JAM72S40 LR panels perform well on an industrial rooftop with partial shading from skylights and HVAC equipment? Yes — the half-cut cell architecture in the JAM72S40 LR is specifically designed for these conditions. Splitting each cell reduces the impact of localized shading from skylights, parapets, or HVAC units on overall string performance. The series is well-suited for industrial and commercial rooftop systems where mounting obstructions are common. ### How does TOPCon technology in the JAM72S40 LR affect panel performance during summer heat? TOPCon cells feature a lower temperature coefficient for Pmax — approximately -0.30%/°C — compared to standard PERC modules, which typically lose -0.35%/°C or more per degree of temperature rise. In practice, this means less power loss on hot days and a meaningfully higher annual energy yield, a key advantage for installations on heat-absorbing industrial rooftops. ### What are the dimensions and weight of the JAM72S40 LR 605W module — is it suitable for an industrial rooftop? The JAM72S40 LR 605W module measures approximately 2465 × 1134 × 35 mm and weighs around 31 kg. These dimensions are standard for the 72-cell commercial format. For existing rooftop installations, structural load capacity should be verified by a structural engineer before deployment, especially for high-density arrays. The series is equally well-suited for ground-mount and large-scale utility systems. ### Is the JA Solar JAM72S40 LR bifacial — does it generate power from both sides of the panel? No, the JAM72S40 LR is a monofacial module that captures sunlight only from the front surface. Unlike bifacial models such as the JAM72D40 LB, it does not require a high-albedo ground surface or elevated mounting height to unlock rear-side gain. This simplifies racking selection and makes it a straightforward choice for standard rooftop and ground-mount installations. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/9023da0401866cb-439798303116.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +45 W, +2.3 pp, +5 yr warranty | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +40 W, +2.1 pp, +5 yr warranty | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | -45 W, +1.9 pp, +5 yr warranty | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | +35 W, +1.9 pp, +5 yr warranty | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | -50 W, +1.7 pp, +5 yr warranty | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | +30 W, +1.7 pp, +5 yr warranty | | [JA Solar JAM72D30-555/LB/1500V](https://comparepv.com/panel/ja-solar-jam72d30-555-lb-1500v) | 555 W | Hotter, heavier, -1.9 pp | | [JA Solar JAM72D30-560/LB/1500V](https://comparepv.com/panel/ja-solar-jam72d30-560-lb-1500v) | 560 W | Hotter, heavier, -1.7 pp | | [JA Solar JAM72D30-565/LB/1500V](https://comparepv.com/panel/ja-solar-jam72d30-565-lb-1500v) | 565 W | Hotter, heavier, -1.5 pp | | [JA Solar JAM72D30-570/LB/1500V](https://comparepv.com/panel/ja-solar-jam72d30-570-lb-1500v) | 570 W | Hotter, heavier, -1.4 pp | | [JA Solar JAM72D30-575/LB/1500V](https://comparepv.com/panel/ja-solar-jam72d30-575-lb-1500v) | 575 W | Hotter, heavier, -1.2 pp | | [JA Solar JAM72D30-580/LB/1500V](https://comparepv.com/panel/ja-solar-jam72d30-580-lb-1500v) | 580 W | Hotter, heavier, -1.0 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +75 W, +2.3 pp, +5 yr warranty | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +70 W, +2.1 pp, +5 yr warranty | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +65 W, +1.9 pp, +5 yr warranty | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +65 W, +1.9 pp, +5 yr warranty | --- Source: https://comparepv.com/panel/ja-solar-jam72s40-605-lr Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.