--- title: "JA Solar JAM72D40-615/LB 615W Solar Panel - Specs & Review | ComparePV" description: "JA Solar JAM72D40-615/LB 615W solar panel. Specs: 23.20% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ja-solar-jam72d40-615-lb" updated: 2026-09-11 --- # JA Solar JAM72D40-615/LB Space saver, no clear weak spot 1,086 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** JA Solar - **Model:** JAM72D40-615/LB - **Series:** JAM72D40 LB - **Rated power:** 615 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 600-650 W (1086 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 615 W | 620 W | Typical | | | Module efficiency | 23.20% | 22.80% | Strong - top 23% | 1,306 | | Power density | 232.5 | 227.7 | Strong - top 19% | 1,249 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 32.5 kg | 32.7 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.20% | 22.80% | Strong - top 23% | 1,306 | | Power density | 232.5 | 227.7 | Strong - top 19% | 1,249 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 52.8 | 53.1 | Typical | 6,546 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **232.5 watts per square metre** - Top 19% of the TOPCon 600-650 W segment, against a median of 227.7. - **23.20% module efficiency** - Top 23% of the TOPCon 600-650 W segment, against a median of 22.80%. - **Best for:** Utility-scale, commercial and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 615 W - **Efficiency:** 23.20 % - **Voltage at Pmax (Vmp):** 44.28 V - **Current at Pmax (Imp):** 13.89 A - **Open-circuit voltage (Voc):** 53.00 V - **Short-circuit current (Isc):** 14.61 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:** 2333 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 32.5 kg - **Area:** 2.65 m2 - **Power density:** 232.5 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:** 538 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 1306 of 14005 | | Power density | 1249 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 6546 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Premium efficiency: up to 23.2%** - The top variant delivers 23.2% module efficiency, outperforming direct comparables: GCL-M12/60H (21.7%), Risen TITAN (21.7%), and LONGi Hi-MO X6 Explorer (22.8%). The 0.4–1.5 pp advantage translates into meaningfully higher energy yield per unit of roof or ground area. - **N-type TOPCon: no LID, low degradation** - N-type TOPCon cells eliminate the LID (Light Induced Degradation) effect common in P-type PERC. Annual degradation is approximately 0.4%/year (after ~1% first-year loss) vs. 0.5–0.55%/year for PERC, resulting in approximately 87% retained nameplate power after 30 years — consistent with JA Solar's linear power warranty. - **Bifacial gain with double-glass construction** - Bifaciality factor reaches ~80% (±5%), delivering an additional 5–15% energy yield on ground-mount and light-colored rooftop installations compared to monofacial modules. The dual-glass laminate eliminates the backsheet as a failure point and improves resistance to moisture ingress, PID, and UV degradation. - **30-year linear power warranty** - JA Solar guarantees linear power degradation not exceeding ~0.55%/year over 30 years — a bankability-grade commitment critical for LCOE modeling and non-recourse project finance underwriting. The product (workmanship) warranty period is 12 years. - **JA Solar – BNEF Tier-1, #1 Wood Mackenzie H1 2025** - JA Solar holds BNEF Tier-1 bankable status and ranked #1 in the Wood Mackenzie Global Solar Module Manufacturer ranking for H1 2025 (score: 91.7/100) with annual output exceeding 80 GW. Manufacturer bankability reduces project finance risk and supports non-recourse debt financing for utility-scale PV farms. ## Cons - **Module weight: ~31.8 kg** - The dual-glass construction weighs approximately 31.8 kg (2,333 × 1,134 × 30 mm), roughly 4–5 kg heavier than comparable single-glass modules at this power class. On industrial rooftops with structural load capacity below 15 kg/m², an engineering review is required before specifying this series. - **Product warranty: 12 years (market standard)** - The workmanship and materials warranty is 12 years — in line with the segment average, but below LONGi Solar's 15-year coverage on the Hi-MO X6 Explorer. For investors prioritizing execution risk mitigation over a 15–20-year horizon, this gap may serve as a valid negotiation point. ## About this series The JA Solar JAM72D40 LB series is designed to maximize yield in projects where every square meter counts, and predictable energy production is key. The use of **N-type TOPCon cells** helps minimize typical losses seen in older technologies and maintains stable module performance over the long term. The **double-glass construction** enhances environmental resistance, valued by investors prioritizing longevity and lower service risks. A key advantage is **bifacial capability**-the module can harvest energy from both sides, effectively boosting yield on bright rooftops, ground-mounted structures, or farms with appropriately oriented module surfaces. Thanks to **half-cut cells and a multi-busbar configuration**, the series performs better with microcracking and electrical loads, simplifying string design. This is the choice for PV farms, large industrial rooftops, and installations where LCOE, reliability, and consistent quality are top priorities. ## Notable figures - Efficiency of 23.2% matches the \*\*TOPCon 600-650W\*\* median - Power density of 232.5 W/m² packs 4.8 W/m² more into the same footprint vs \*\*TOPCon 600-650W\*\* median (227.7 W/m²) - Temperature coefficient of -0.29%/°C matches the \*\*TOPCon 600-650W\*\* median - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface - Ranked #1306 out of 14005 panels for efficiency in the database ## Questions ### How does the bifacial design of the JA Solar JAM72D40 LB actually improve energy yield? The bifacial N-type TOPCon cells in the JAM72D40 LB series capture sunlight from both the front and rear of the module. On reflective surfaces — white roofing membranes, gravel, concrete, or snow-covered ground — the additional rear-side gain can add several to over ten percent compared to a monofacial module. The benefit is greatest in ground-mounted systems with elevated racking and a light-colored surface beneath the panels. ### What warranties does JA Solar offer for the JAM72D40 LB series, and what do they cover? JA Solar provides a 12-year product warranty covering material and workmanship defects, and a 30-year linear power output warranty. Degradation is capped at 1% in year one and 0.4% per year thereafter, meaning the module retains at least 87.4% of its rated power after 30 years. This is one of the longer performance guarantees available in the commercial module segment. ### How does the TOPCon technology in the JAM72D40 LB compare to standard PERC modules, and is it worth the price difference? TOPCon cells feature a thin passivation layer that reduces electron recombination losses. In practical terms, this delivers higher module efficiency (approximately 22.3–23%), a lower temperature coefficient, and slower long-term degradation — around 0.4%/year versus roughly 0.55%/year for older PERC modules. Over a 25–30-year project lifetime, the cumulative energy output difference is meaningful, particularly in large commercial or utility-scale installations. ### Are the JAM72D40 LB modules suitable for large industrial rooftops or warehouse installations? Yes, the JAM72D40 LB series is specifically designed for commercial and industrial applications. At approximately 2333×1134 mm and up to 615 Wp per module, it allows high-power systems to be built with fewer modules and a faster installation schedule. The mechanical ratings — 5400 Pa snow load and 2400 Pa wind load — fully meet structural requirements for typical European climatic conditions. ### What advantage do the half-cut cells and multi-busbar layout provide in the JAM72D40 LB? Half-cut cells split the current path into two independent sub-circuits, so partial shading on one half of the module does not shut down the other half's output. The multi-busbar layout shortens the current path across each cell, reducing resistive losses and improving resilience against microcracks. Together, these features increase energy yield under partial shading conditions and simplify string design for sites with variable irradiance. ### How heavy is the JAM72D40 LB module, and does it require a special mounting structure? Each JAM72D40 LB module weighs approximately 31.8 kg — noticeably more than a typical residential panel. For rooftop installations, it is important to verify structural load capacity and use mounting hardware rated for large-format modules (2333×1134 mm). For ground-mounted arrays, the weight is not a limiting factor; standard steel racking used in utility-scale PV farms is fully compatible. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/da083e0ae252d27-ddf2aff5416c.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +35 W, lighter, +2.0 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +30 W, lighter, +1.8 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +1.6 pp | | [Longi Solar LR8-66HVD-665M](https://comparepv.com/panel/longi-lr8-66hvd-665m) | 665 W | +50 W, cooler, +1.4 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (665W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-665w-class) | 665 W | +50 W, cooler, +1.4 pp | | [Huayao HY665-B144DSS](https://comparepv.com/panel/huayao-hy665-b144dss) | 665 W | +50 W, lighter, +1.4 pp | | [Sunpro Power SPDG665-BC132R12](https://comparepv.com/panel/sunpro-spdg665-bc132r12) | 665 W | +50 W, cooler, +1.4 pp | | [JA Solar JAM72D30-555/LB/1500V](https://comparepv.com/panel/ja-solar-jam72d30-555-lb-1500v) | 555 W | -60 W, hotter, -2.2 pp | | [JA Solar JAM72D30-560/LB/1500V](https://comparepv.com/panel/ja-solar-jam72d30-560-lb-1500v) | 560 W | -55 W, hotter, -2.0 pp | | [JA Solar JAM72D30-565/LB/1500V](https://comparepv.com/panel/ja-solar-jam72d30-565-lb-1500v) | 565 W | -50 W, hotter, -1.8 pp | | [JA Solar JAM72D30-570/LB/1500V](https://comparepv.com/panel/ja-solar-jam72d30-570-lb-1500v) | 570 W | -45 W, hotter, -1.7 pp | | [JA Solar JAM72D30-575/LB/1500V](https://comparepv.com/panel/ja-solar-jam72d30-575-lb-1500v) | 575 W | -40 W, hotter, -1.5 pp | | [JA Solar JAM72D30-580/LB/1500V](https://comparepv.com/panel/ja-solar-jam72d30-580-lb-1500v) | 580 W | -35 W, hotter, -1.3 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +65 W, lighter, +2.0 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +60 W, lighter, +1.8 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +55 W, lighter, +1.6 pp | --- Source: https://comparepv.com/panel/ja-solar-jam72d40-615-lb 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.