--- title: "JA Solar JAM54D41-445/LR 445W Solar Panel - Specs & Review | ComparePV" description: "JA Solar JAM54D41-445/LR 445W solar panel. Specs: 22.30% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ja-solar-jam54d41-445-lr" updated: 2026-09-11 --- # JA Solar JAM54D41-445/LR Efficiency leader, no clear weak spot 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** JA Solar - **Model:** JAM54D41-445/LR - **Series:** JAM54D41 LR (Black Modules, n-type Double Glass Monofacial, DeepBlue 4.0 Pro) - **Rated power:** 445 W - **Cell technology:** TOPCon ## How it compares Compared against segment TOPCon 400-450 W (1218 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 445 W | 435 W | Strong - top 8% | | | Module efficiency | 22.30% | 22.00% | Strong - top 17% | 5,100 | | Power density | 222.7 | 220.2 | Typical | 5,302 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 22.0 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 | 22.30% | 22.00% | Strong - top 17% | 5,100 | | Power density | 222.7 | 220.2 | Typical | 5,302 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 49.4 | 51.4 | Typical | 2,959 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **22.30% module efficiency** - Top 17% of the TOPCon 400-450 W segment, against a median of 22.00%. - **Best for:** Residential, shaded-installations and cold-climate. ## Specification ### Electrical - **Rated power (Pmax):** 445 W - **Efficiency:** 22.30 % - **Voltage at Pmax (Vmp):** 32.65 V - **Current at Pmax (Imp):** 13.63 A - **Open-circuit voltage (Voc):** 39.10 V - **Short-circuit current (Isc):** 14.40 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:** 108 ### Physical - **Length:** 1762 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 22.0 kg - **Area:** 2.00 m2 - **Power density:** 222.7 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 88.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 389 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 5100 of 14005 | | Power density | 5302 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 2959 of 14005 | | Warranty | 21 of 14005 | ## Pros - **N-type TOPCon cell technology** - N-type TOPCon cells deliver a temperature coefficient of -0.29%/°C versus ~-0.35%/°C for standard PERC, yielding higher output on hot days. Annual degradation of ~0.4% post year-1 and inherent resistance to LID/LeTID reduce long-term power loss compared to the PERC generation. - **Module efficiency 22–22.8%** - The 22.0–22.8% efficiency range matches best-in-class peers — on par with IBC Solar LS-TA2 (22.8%) and Sunlike SKT455 (22.8%). By comparison, the Waaree ARKA series reaches only 20.93% at the same 455 Wp power class, a difference of ~1.9 percentage points. - **Double glass construction** - A rear tempered glass pane replaces the polymer backsheet, providing superior moisture ingress resistance, UV stability, and micro-crack resistance under mechanical stress or transport. The module is rated for snow loads up to 5,400 Pa and wind loads up to 2,400 Pa, relevant for Polish climate conditions with typical snow loads of 1,500–3,000 Pa (zones II–III per PN-EN 1991-1-3). - **30-year linear power warranty** - JA Solar guarantees ≥87.4% of nominal power after 30 years (~0.4%/year post year-1 degradation), exceeding the 25-year standard offered by Sunlike Solar and Waaree ARKA in the same power class. The extended warranty horizon lowers the installation's LCOE over the full system lifetime. - **JA Solar – BNEF Tier-1 manufacturer** - JA Solar is consistently listed as a BNEF Tier-1 (bankable) manufacturer and ranks among the top five global PV module producers, with manufacturing capacity exceeding 100 GW/year as of Q1 2025. This ensures supply chain stability and credible warranty serviceability throughout the full 30-year power warranty period. ## Cons - **15-year product warranty** - The product warranty stands at 15 years, while premium brands such as Maxeon, REC Alpha, and IBC Solar (one of the peer comparables) offer 20–25 years as standard. For a double-glass n-type module priced above the segment median, this falls short of top-tier buyer expectations. - **Monofacial – no rear-side yield gain** - The LR variant is monofacial (no rear-side generation); the sibling JAM54D41/LB bifacial double-glass series delivers up to +6.3% additional rear-side yield. On flat-roof installations with high-albedo surfaces (gravel ballast, white TPO membrane, light metal roofing), the monofacial design foregoes an estimated 15–30 kWh/kWp per year under Polish irradiation conditions (~1,000–1,100 kWh/m²/year). ## About this series JA Solar JAM54D41 LR (DeepBlue 4.0 Pro) series are **full black monofacial modules** designed for maximally aesthetic rooftop installations, with no compromises on durability. The use of **n-type TOPCon cells** translates to more stable performance over time and better resistance to typical degradation phenomena, genuinely reducing the risk of yield drops in the long term. The key advantage of this series is the **double glass construction** - instead of a traditional foil-backlaminated module, you get a sturdier, better-protected module, more resistant to moisture, UV exposure, and micro-cracks that can occur, for example, under snow loads or during transport. The JAM54D41 LR is particularly suitable for single-family homes and multi-family buildings' rooftops, where aesthetics, reliability, and trouble-free operation are key. Compared to many competitive full-black panels, it stands out with the combination of **n-type** and **double glass**, delivering more predictable performance in demanding conditions. ## Notable figures - Efficiency of 22.3% matches the \*\*TOPCon 400-450W\*\* median - Power density of 222.7 W/m² matches the \*\*TOPCon 400-450W\*\* median - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 400-450W\*\* panels - #5100 for efficiency, #2165 for temperature performance out of 14005 panels ## Questions ### What warranty comes with the JA Solar JAM54D41 LR DeepBlue 4.0 Pro panels? The JAM54D41 LR series includes a 15-year product warranty covering manufacturing defects and a 30-year linear power output warranty. After 30 years, JA Solar guarantees at least 87.4% of rated power. This is one of the longer power warranties available in the n-type full-black module segment, making it especially valuable for long-term residential installations expected to operate for several decades. ### How do JA Solar JAM54D41 LR panels perform in winter and at low temperatures? The n-type TOPCon cells in the JAM54D41 LR series have a temperature coefficient of approximately -0.29%/°C, which is better than typical p-type PERC modules at around -0.35%/°C. This means less power loss during hot summer days and more stable output year-round. In temperate climates with cool springs and autumns, this translates into a measurably higher annual energy yield. ### What are the benefits of the double glass construction in the JAM54D41 LR and is it more durable than a standard panel? In the JAM54D41 LR, the rear backsheet is replaced by a second glass layer. This design provides superior protection against moisture ingress, UV radiation, and micro-cracks that can develop during transport or under snow loads of up to 5400 Pa. Double glass modules degrade more slowly over time and outperform standard foil-backsheet laminates in demanding weather conditions. ### How does the JA Solar JAM54D41 LR (n-type TOPCon) differ from common p-type PERC panels? N-type TOPCon cells offer higher efficiency and a better temperature coefficient than p-type PERC. The critical difference is resistance to LID (Light Induced Degradation) — n-type modules show virtually no LID, meaning they lose almost no power in the first weeks of operation. In practice, this results in more predictable output over the full 30-year warranty period and a lower LCOE over the system's lifetime. ### Are the JAM54D41 LR panels suitable for a pitched residential roof and what do they look like after installation? Yes, the JAM54D41 LR is a full-black monofacial module — black frame, black cells, and black rear glass — designed specifically for aesthetically demanding rooftop installations. Module dimensions are approximately 1762×1134 mm, weight around 22 kg. The all-black appearance integrates seamlessly with dark roof surfaces. Being monofacial, the module requires no special racking to allow rear-side light access, which simplifies mounting hardware selection. ### Are the JA Solar JAM54D41 LR modules still available on the market? Yes, the JAM54D41 LR DeepBlue 4.0 Pro series is actively manufactured and available through distribution channels. JA Solar is a Tier 1 manufacturer with a long-established market presence, which provides confidence in the availability of compatible modules for future system expansions and continuity of warranty support. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/d5c3764219b0e93-d45f8143abc6.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +50 W, cooler, +2.5 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +45 W, cooler, +2.2 pp | | [Suntech STP-NT11/48QGSF-490](https://comparepv.com/panel/suntech-stp-nt11-48qgsf-490) | 490 W | +45 W, cooler, +2.2 pp | | [JA Solar JAT54S40-485/LR](https://comparepv.com/panel/ja-solar-jat54s40-485-lr) | 485 W | +40 W, cooler, +2.0 pp | | [AIKO AIKO-A485-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a485-mce54mw) | 485 W | +40 W, cooler, +2.0 pp | | [Longi Solar LR7-54HJD-495M](https://comparepv.com/panel/longi-lr7-54hjd-495m) | 495 W | +50 W, cooler, +2.0 pp | | [AIKO AIKO-A485-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a485-mah54mw) | 485 W | +40 W, cooler, +2.0 pp | | [JA Solar NS-420MH-108](https://comparepv.com/panel/ja-solar-ns-420mh-108) | 420 W | -25 W, heavier, -1.3 pp | | [JA Solar JAM54D41-430/LB](https://comparepv.com/panel/ja-solar-jam54d41-430-lb-1) | 430 W | -15 W, -0.8 pp | | [JA Solar JAM54S40-435/LR](https://comparepv.com/panel/ja-solar-jam54s40-435-lr) | 435 W | -10 W, lighter, -0.5 pp | | [JA Solar JAM54S40-440/LR](https://comparepv.com/panel/ja-solar-jam54s40-440-lr) | 440 W | Lighter, -0.3 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +65 W, cooler, +2.7 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +60 W, cooler, +2.4 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +55 W, cooler, +2.2 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +55 W, cooler, +2.2 pp | --- Source: https://comparepv.com/panel/ja-solar-jam54d41-445-lr Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.