--- title: "JA Solar JAM54D40-425/GB/1500V Solar Panel: Specs & Datasheet | ComparePV" description: "JA Solar JAM54D40-425/GB/1500V solar panel. Specs: 21.80% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ja-solar-jam54d40-425-gb-1500v" image: "https://comparepv.com/og/panel/ja-solar-jam54d40-425-gb-1500v.png" updated: 2026-09-11 --- # JA Solar JAM54D40-425/GB/1500V Middle of its segment, weak in heat 322 panels in the segment N-type 400-450 W ## Identity - **Manufacturer:** JA Solar - **Model:** JAM54D40-425/GB/1500V - **Series:** JAM54D40 415-440/GB/1500V Series - **Rated power:** 425 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 400-450 W (322 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 425 W | 430 W | Typical | | | Module efficiency | 21.80% | 21.95% | Typical | 7,085 | | Power density | 217.6 | 218.4 | Typical | 7,235 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 25% | 6,152 | | Weight (kg) | 21.5 kg | 22.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.80% | 21.95% | Typical | 7,085 | | Power density | 217.6 | 218.4 | Typical | 7,235 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 25% | 6,152 | | Weight per kWp | 50.6 | 51.2 | Typical | 4,012 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **-0.300 %/°C temperature coefficient** - Bottom 25% of the N-type 400-450 W segment, against a median of -0.290. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 425 W - **Efficiency:** 21.80 % - **Voltage at Pmax (Vmp):** 32.01 V - **Current at Pmax (Imp):** 13.28 A - **Open-circuit voltage (Voc):** 38.20 V - **Short-circuit current (Isc):** 14.16 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:** N-type - **Cell count:** 108 - **Bifacial:** yes - **Bifacial gain:** 8.00 ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 21.5 kg - **Area:** 1.95 m2 - **Power density:** 217.6 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:** 371 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 7085 of 14129 | | Power density | 7235 of 14129 | | Temperature coefficient | 6152 of 14129 | | Weight | 4012 of 14129 | | Warranty | 21 of 14129 | ## Pros - **Low temperature coefficient - N-type advantage** - N-type TOPCon cells deliver a temperature coefficient of Pmax = -0.29%/°C vs. the typical -0.35%/°C of legacy PERC modules. At a cell operating temperature of 70°C (typical Polish summer conditions), this translates to roughly 3% higher real-world output compared to an equivalent-STC-rated PERC module, while also keeping first-year LID degradation below 1%. - **Bifacial Double Glass - albedo energy gain** - The module's bifaciality factor is 80% (±10%), yielding an additional 5-15% annual energy gain under typical ground albedo of 20-30% (light gravel, snow, white TPO membrane) versus monofacial modules. The all-glass construction eliminates the rear EVA backsheet, blocking moisture ingress and electrochemical corrosion over a 30+ year service life. - **30-year linear power warranty** - JA Solar guarantees ≥87.4% of rated power after 30 years at ≤0.40% annual degradation - one of the longest warranty commitments in the 54-cell N-type segment. Direct peer comparables (KDM Kingdom Solar, Seraphim Nebula) do not publicly disclose 30-year warranty terms for equivalent power variants. - **1500V system voltage - reduced BoS costs** - Support for 1500 V system voltage allows 25-28 modules per string (vs. ~18 at 1000 V), reducing DC cable runs, combiner boxes, and MPPT inputs. For installations above 100 kWp, estimated BoS material savings reach 4-8% of total installed cost. - **BNEF Tier-1 bankable manufacturer** - JA Solar (founded 2005, HQ China) has maintained continuous BNEF Tier-1 bankable status and is listed in Q1 2026 summaries. Tier-1 status means project financing backed by these modules is accepted by banks and infrastructure funds without additional manufacturer-creditworthiness guarantees. ## Cons - **12-year product warranty - below newer variants** - The /GB/1500V series carries only a 12-year product warranty, while JA Solar's own newer variant from the same family - JAM54D40 LB BF 15Y - offers 15 years. In the premium N-type segment, 12 years is increasingly viewed as the market floor and may be a constraint in project-finance structures requiring extended material coverage. - **22.5% max efficiency - Luxor reaches 22.86%** - Among direct peer comparables, the Luxor ECO LINE N-TYPE TOPCON NON-REFLECT achieves 22.86% efficiency at the same 440 Wp peak power - 0.36 percentage points higher. For roof installations with tight area constraints (e.g., \<20 m²), this translates to approximately 1.6% more energy from the same footprint. ## About this series The JAM54D40 415-440/GB/1500V module series is an advanced solution based on **n-type cell technology**, which redefines performance standards in the Polish climate. Thanks to the use of **bifacial Double Glass** architecture, these panels not only generate energy from both sides but also exhibit exceptional resistance to light-induced degradation and extreme weather conditions. It is a key response to the challenges related to installation longevity, as the glass-glass construction minimizes the risk of micro-cracks and chemical corrosion in harsh environmental conditions. This series stands out from the competition with a significantly better temperature coefficient, which translates into tangible energy gains on hot summer days when standard modules rapidly lose efficiency. It is primarily intended for demanding investors seeking **maximum power density** on limited roof areas and for modern photovoltaic farms where high yields from radiation reflected from the ground are key. The use of the **1500V voltage standard** allows for significant optimization of wiring costs in large-scale projects, making this series one of the most cost-effective choices in the premium segment. It is a solid foundation for a safe investment, combining innovative technological solutions with **above-average mechanical strength** and stability of electrical parameters throughout the product life cycle. ## Notable figures - At 21.8% efficiency, this panel is on par with typical \*\*N-type 400-450W\*\* modules - Power density of 217.6 W/m² matches the \*\*N-type 400-450W\*\* median - At -0.30%/°C, hot weather performance is typical for \*\*N-type 400-450W\*\* panels - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof - Ranked #7085 out of 14129 panels for efficiency in the database ## Questions ### How does the N-type cell technology in the JAM54D40 415-440/GB/1500V series differ from standard PERC modules? The N-type cells used in the JAM54D40 415-440/GB/1500V series exhibit significantly lower light-induced degradation (LID) compared to P-type PERC cells. In practical terms, the module retains more of its rated power after the initial weeks of operation than PERC counterparts. Module efficiency reaches approximately 22.5%, a level difficult to achieve with standard PERC technology. For the investor, this translates into measurably higher energy yield over the full 30-year linear power warranty period. ### How does bifacial technology work in the JAM54D40 415-440/GB series, and does it make sense on a typical sloped residential roof? Bifacial technology allows JAM54D40 415-440/GB modules to generate electricity from both the front and rear surfaces thanks to the Double Glass construction. Bifaciality is rated at approximately 80%, meaning the rear side can deliver up to 80% of the front-side output. On sloped roofs, rear-side gains are limited due to the close proximity of the roofing surface. However, the Double Glass design still delivers a key benefit: superior resistance to microcracks and chemical corrosion, extending system lifespan in variable Central European climates. ### What is the temperature coefficient of the JAM54D40 440W panels and what does it mean for summer performance? The power temperature coefficient for the JAM54D40 415-440/GB/1500V series is -0.29%/°C. Typical PERC modules reach around -0.35%/°C. In summer, when module temperature climbs to 65°C (40°C above STC), the JAM54D40 loses approximately 11.6% of its rated power, whereas a PERC module would lose around 14%. At 440 Wp, this means roughly 10-11 W more output on a hot day - a difference that adds up to a noticeably higher annual energy yield. ### What warranty does the JAM54D40 415-440/GB/1500V series carry and what exactly is covered? JA Solar provides a 12-year product warranty on the JAM54D40 415-440/GB/1500V series, covering material and manufacturing defects. In addition, a 30-year linear power warranty applies - after 30 years the module retains at least 87.4% of its nominal power. JA Solar holds Bloomberg NEF Tier 1 manufacturer status, which reduces counterparty risk when it comes to honoring warranty claims over the long investment horizon. ### Is the JAM54D40 415-440/GB/1500V series compatible with 1000V inverters, or does it require specialized equipment? The JAM54D40 415-440/GB/1500V series is optimized for 1500V DC systems, but modules can operate in 1000V systems as well - the system designer simply configures shorter strings accordingly. The 1500V standard is most beneficial in commercial and utility-scale PV plants: it allows more modules per string, reducing BoS costs and the number of MPPT inputs required. For residential prosumer installations, standard 1000V inverters are fully compatible with these modules. ### What are the dimensions and weight of the JAM54D40 440W panels, and can they be self-installed on a rooftop? The JAM54D40 415-440/GB/1500V panel measures 1722 × 1134 × 30 mm and weighs approximately 21.5 kg. The Double Glass construction makes it slightly heavier than conventional glass-backsheet modules, which must be accounted for in the structural roof assessment and racking system selection. DIY installation without proper training and certifications is not recommended - correct DC wiring requires qualified electrical credentials, and improper installation may void the product warranty. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/20230224014825425-1e37bf7fc173.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Maxeon SPR-MAX7-475](https://comparepv.com/panel/maxeon-spr-max7-475) | 475 W | +50 W, +2.2 pp, +10 yr warranty | | [Just Solar JST-EDMH-(445-465)W-TD (465W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-465w-class) | 465 W | +40 W, lighter, +2.0 pp | | [JA Solar JAT54S40-475/LR](https://comparepv.com/panel/ja-solar-jat54s40-475-lr) | 475 W | +50 W, cooler, +2.0 pp | | [Tongwei TWMNH-48HW475](https://comparepv.com/panel/tongwei-solar-twmnh-48hw475) | 475 W | +50 W, heavier, +2.0 pp | | [Astronergy CHSM48RN(DG)/F-BH-475](https://comparepv.com/panel/astronergy-chint-new-energy-technology-co-ltd-chsm48rn-dg-f-bh-475) | 475 W | +50 W, heavier, +2.0 pp | | [AIKO AIKO-A475-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a475-mce54mw) | 475 W | +50 W, cooler, +2.0 pp | | [AIKO AIKO-A475-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a475-mah54mw) | 475 W | +50 W, cooler, +2.0 pp | | [JA Solar JAM54S31-380/MR](https://comparepv.com/panel/ja-solar-jam54s31-380-mr) | 380 W | Hotter, -2.3 pp, -5 yr warranty | | [JA Solar JAM54S31-385/MR](https://comparepv.com/panel/ja-solar-jam54s31-385-mr) | 385 W | Hotter, -2.1 pp, -5 yr warranty | | [JA Solar JAM54D30-390/MB/1500V](https://comparepv.com/panel/ja-solar-jam54d30-390-mb-1500v) | 390 W | -35 W, hotter, -1.9 pp | | [JA Solar JAM54S31-390/MR](https://comparepv.com/panel/ja-solar-jam54s31-390-mr) | 390 W | Hotter, -1.8 pp, -5 yr warranty | | [JA Solar JAM54D30-395/MB/1500V](https://comparepv.com/panel/ja-solar-jam54d30-395-mb-1500v) | 395 W | -30 W, hotter, -1.6 pp | | [JA Solar JAM54S31-395/MR](https://comparepv.com/panel/ja-solar-jam54s31-395-mr) | 395 W | Hotter, -1.6 pp, -5 yr warranty | | [JA Solar JAM54S30-400/MR](https://comparepv.com/panel/ja-solar-jam54s30-400-mr) | 400 W | Hotter, -1.3 pp, -5 yr warranty | | [JA Solar JAM54D30-400/MB/1500V](https://comparepv.com/panel/ja-solar-jam54d30-400-mb-1500v) | 400 W | -25 W, hotter, -1.4 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +85 W, cooler, +3.2 pp | --- Source: https://comparepv.com/panel/ja-solar-jam54d40-425-gb-1500v 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.