--- title: "JA Solar JAM54D41-420/GB Solar Panel: Specs & Datasheet | ComparePV" description: "JA Solar JAM54D41-420/GB solar panel. Specs: 21.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ja-solar-jam54d41-420-gb" image: "https://comparepv.com/og/panel/ja-solar-jam54d41-420-gb.png" updated: 2026-09-11 --- # JA Solar JAM54D41-420/GB Middle of its segment, modest efficiency 1,220 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** JA Solar - **Model:** JAM54D41-420/GB - **Series:** JAM54D41 400-425/GB Series - **Rated power:** 420 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 400-450 W (1220 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 420 W | 435 W | Weak - bottom 16% | | | Module efficiency | 21.50% | 22.00% | Weak - bottom 17% | 8,022 | | Power density | 215.1 | 220.2 | Weak - bottom 18% | 7,946 | | Temperature coefficient | -0.300 | -0.290 | Typical | 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 | 21.50% | 22.00% | Weak - bottom 17% | 8,022 | | Power density | 215.1 | 220.2 | Weak - bottom 18% | 7,946 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,152 | | Weight per kWp | 51.2 | 51.5 | Typical | 4,591 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **21.50% module efficiency** - Bottom 17% of the TOPCon 400-450 W segment, against a median of 22.00%. - **215.1 watts per square metre** - Bottom 18% of the TOPCon 400-450 W segment, against a median of 220.2. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 420 W - **Efficiency:** 21.50 % - **Voltage at Pmax (Vmp):** 31.80 V - **Current at Pmax (Imp):** 13.21 A - **Open-circuit voltage (Voc):** 38.05 V - **Short-circuit current (Isc):** 14.09 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:** 108 - **Bifacial:** yes ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 21.5 kg - **Area:** 1.95 m2 - **Power density:** 215.1 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:** 367 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 8022 of 14129 | | Power density | 7946 of 14129 | | Temperature coefficient | 6152 of 14129 | | Weight | 4591 of 14129 | | Warranty | 21 of 14129 | ## Pros - **Up to 21.8% efficiency - best among peer comparables** - The top variant of the series reaches 21.8% module efficiency, outperforming all listed peers: Hyundai DG G12 PERC Shingled (21.4%), Trina Solar Vertex S (21.3%), and Tongwei TERRA 5K (21.4%). This translates to higher energy yield per unit of available roof area. - **N-type TOPCon Bycium+ with 16BB SMBB** - N-type TOPCon eliminates Light-Induced Degradation (LID) typical of P-type PERC cells. The power temperature coefficient is -0.29%/°C versus ~-0.35%/°C for PERC - roughly 17% lower thermal losses at module temperatures above 25°C, a meaningful advantage given high summer roof temperatures in Central European climates. - **Double glass + ~80% bifaciality factor** - Dual 1.6 mm heat-strengthened glass provides PID resistance, corrosion immunity, and high snow-load tolerance. The ~80%±10% bifaciality factor enables additional rear-side energy yield - particularly advantageous on light-colored flat roofs or ground-mount systems with reflective surfaces. - **30-year linear power warranty at 87.4%** - The manufacturer guarantees ≤1% first-year degradation and ≤0.4%/year thereafter, ensuring ≥87.4% of rated power after 30 years. This is consistent with current premium-segment benchmarks and comparable to Trina Solar Vertex S and Tongwei TERRA 5K published warranty terms. - **BNEF Tier-1 bankable manufacturer (Q2 2026)** - JA Solar has maintained BNEF Tier-1 status through Q1 and Q2 2026, alongside Jinko Solar, LONGi, and Trina Solar. This designation is a prerequisite for project financing by institutional lenders and significantly reduces counterparty risk for both utility-scale developers and residential prosumers. ## Cons - **Discontinued series (2022-2023)** - The JAM54D41 400-425/GB was in production for approximately one year (launched 2022, end-of-life 2023). Limited new inventory on the distribution market raises the risk of delays in warranty replacements and makes future system expansions with identical modules difficult. - **12-year product warranty - below current market standard** - Newer variants of the same family (JAM54D41 LB/MB) already carry a 25-year product warranty, as does the majority of currently available Tier-1 premium modules. The 12-year product warranty on the GB series is a clear disadvantage compared to today's market and should be factored into TCO calculations for installations with a 20+ year horizon. ## About this series JA Solar JAM54D41 400-425/GB series modules bring a new level of quality to prosumer installations thanks to the use of **n-type cells in Bycium+ technology**. This innovative architecture significantly reduces light-induced degradation, which translates into stable energy production for decades. This series solves the problem of performance drops in difficult weather conditions, offering an exceptionally low temperature coefficient and better responsiveness on cloudy days. The **Double Glass** design ensures excellent mechanical strength and full resistance to corrosive factors, making these panels an ideal choice for investors looking for long-term solutions. Thanks to the use of **Super Multi-Busbar** (SMBB) technology, these modules minimize current transmission losses within the cell, maximizing yields from every square meter of the roof. This solution is primarily dedicated to modern residential housing and small businesses, where aesthetics and maximizing self-consumption are key. Compared to standard p-type modules, this series offers significantly higher **bifacial efficiency** and a longer linear power output warranty, which realistically increases the profitability of the entire photovoltaic investment in Polish solar conditions. ## Notable figures - Efficiency of 21.5% matches the \*\*TOPCon 400-450W\*\* median - At 215.1 W/m², this panel generates 5.1 W/m² less per unit area than \*\*TOPCon 400-450W\*\* median (220.2 W/m²) - At -0.30%/°C, hot weather performance is typical for \*\*TOPCon 400-450W\*\* panels - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces - Ranked #8022 out of 14129 panels for efficiency in the database ## Questions ### What is Bycium+ technology in the JAM54D41 400-425/GB series and how does it compare to standard PERC cells? Bycium+ is JA Solar's proprietary label for n-type TOPCon cells. Unlike conventional p-type PERC cells, this architecture virtually eliminates light-induced degradation (LID), delivering higher energy yields throughout the panel's service life. N-type cells also carry a lower temperature coefficient of -0.30%/°C for Pmax, meaning the module loses less power on hot days compared to standard p-type modules. ### What warranty does the JA Solar JAM54D41 400-425/GB series carry and what does it cover? JA Solar backs this series with a 12-year product warranty covering manufacturing defects and materials, plus a 30-year linear power output warranty guaranteeing at least 87.4% of rated power after three decades. While the product warranty period is shorter than some premium-tier competitors, the 30-year power guarantee ranks among the longest available in the residential PV market and meaningfully improves overall LCOE. ### Do JAM54D41 400-425/GB panels perform well in winter or on overcast days? Yes. The series features a low temperature coefficient of -0.30%/°C for Pmax, which limits power loss on hot days while cool winter temperatures actually boost output slightly. The n-type bifacial cells also respond better to diffuse irradiance, which is particularly valuable in Poland's climate where overcast conditions account for a significant share of annual energy production. ### What advantage does the Double Glass construction offer in JAM54D41 400-425/GB panels? Double Glass replaces the traditional backsheet film with a second tempered glass layer, eliminating moisture ingress, backsheet delamination, and UV-driven degradation. The modules handle snow and wind loads more reliably and resist micro-cracking over extended service life. For a rooftop installation planned to run for several decades, this translates to a genuinely longer useful lifetime compared to conventional glass-backsheet modules. ### How much additional energy does the bifacial design of JAM54D41 400-425/GB panels generate? Bifacial gain typically ranges from 5% to 15% depending on the albedo of the surface beneath the array. The JAM54D41 series carries a bifaciality factor of approximately 80%. Maximum rear-side harvest is achieved over high-albedo surfaces such as white roofing membranes, concrete, or light gravel. On dark roofing materials the contribution is lower but still measurable and worth capturing. ### Is the JA Solar JAM54D41 400-425/GB series still available for purchase? The JAM54D41 400-425/GB series has been discontinued and is no longer in active production or standard distribution. JA Solar has superseded it with higher-wattage variants. If you need panels to match or expand an existing installation, contact local distributors for remaining stock or reach out directly to an authorized JA Solar importer, as limited quantities may still be available in the supply chain. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/20230311054158527-0eb80660ad6d.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [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 | +45 W, lighter, +2.3 pp | | [Luxor Solar LX-465M/182R-96+ GG](https://comparepv.com/panel/luxor-lx-465m-182r-96-gg) | 465 W | +45 W, cooler, +2.3 pp | | [Maxeon SPR-MAX7-470](https://comparepv.com/panel/maxeon-spr-max7-470) | 470 W | +50 W, +2.2 pp, +10 yr warranty | | [AIKO AIKO-A470-MAH54Mb](https://comparepv.com/panel/aiko-aiko-a470-mah54mb) | 470 W | +50 W, cooler, +2.1 pp | | [AIKO AIKO-A460-MAH54Mb](https://comparepv.com/panel/aiko-shenzhen-aiko-digital-energy-technology-co-ltd-aiko-a460-mah54mb-1) | 460 W | +40 W, cooler, +2.1 pp | | [TCL Zhonghuan HSM-BD54-LA470](https://comparepv.com/panel/tcl-zhonghuan-hsm-bd54-la470) | 470 W | +50 W, cooler, +2.1 pp | | [JA Solar JAM54S31-380/MR](https://comparepv.com/panel/ja-solar-jam54s31-380-mr) | 380 W | Hotter, -2.0 pp, -5 yr warranty | | [JA Solar JAM54S31-385/MR](https://comparepv.com/panel/ja-solar-jam54s31-385-mr) | 385 W | Hotter, -1.8 pp, -5 yr warranty | | [JA Solar JAM54D30-390/MB/1500V](https://comparepv.com/panel/ja-solar-jam54d30-390-mb-1500v) | 390 W | -30 W, hotter, -1.6 pp | | [JA Solar JAM54S31-390/MR](https://comparepv.com/panel/ja-solar-jam54s31-390-mr) | 390 W | Hotter, -1.5 pp, -5 yr warranty | | [JA Solar JAM54D30-395/MB/1500V](https://comparepv.com/panel/ja-solar-jam54d30-395-mb-1500v) | 395 W | -25 W, hotter, -1.3 pp | | [JA Solar JAM54S31-395/MR](https://comparepv.com/panel/ja-solar-jam54s31-395-mr) | 395 W | Hotter, -1.3 pp, -5 yr warranty | | [JA Solar JAM54S30-400/MR](https://comparepv.com/panel/ja-solar-jam54s30-400-mr) | 400 W | Hotter, -1.0 pp, -5 yr warranty | | [JA Solar JAM54D30-400/MB/1500V](https://comparepv.com/panel/ja-solar-jam54d30-400-mb-1500v) | 400 W | Hotter, heavier, -1.1 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +90 W, cooler, +3.5 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +75 W, cooler, +3.3 pp | --- Source: https://comparepv.com/panel/ja-solar-jam54d41-420-gb 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.