--- title: "JA Solar JAM54D40-445/GB Solar Panel: Specs & Datasheet | ComparePV" description: "JA Solar JAM54D40-445/GB solar panel. Specs: 22.80% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ja-solar-jam54d40-445-gb" image: "https://comparepv.com/og/panel/ja-solar-jam54d40-445-gb.png" updated: 2026-09-11 --- # JA Solar JAM54D40-445/GB Efficiency leader, weak in heat 322 panels in the segment N-type 400-450 W ## Identity - **Manufacturer:** JA Solar - **Model:** JAM54D40-445/GB - **Series:** JAM54D40 GB - **Rated power:** 445 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) | 445 W | 430 W | Strong - top 7% | | | Module efficiency | 22.80% | 21.95% | Strong - top 1% | 2,769 | | Power density | 227.9 | 218.4 | Strong - top 2% | 2,845 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 25% | 6,152 | | Weight (kg) | 21.5 kg | 22.0 kg | Strong - top 22% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.80% | 21.95% | Strong - top 1% | 2,769 | | Power density | 227.9 | 218.4 | Strong - top 2% | 2,845 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 25% | 6,152 | | Weight per kWp | 48.3 | 51.2 | Strong - top 22% | 2,196 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **22.80% module efficiency** - Top 1% of the N-type 400-450 W segment, against a median of 21.95%. Ranked 2,769th in the whole database. - **227.9 watts per square metre** - Top 2% of the N-type 400-450 W segment, against a median of 218.4. Ranked 2,845th in the whole database. - **48.3 kg per kWp** - Top 22% of the N-type 400-450 W segment, against a median of 51.2. ### 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 and shaded-installations. - **Not ideal for:** Hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 445 W - **Efficiency:** 22.80 % - **Voltage at Pmax (Vmp):** 33.64 V - **Current at Pmax (Imp):** 13.23 A - **Open-circuit voltage (Voc):** 39.65 V - **Short-circuit current (Isc):** 13.90 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 ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 21.5 kg - **Area:** 1.95 m2 - **Power density:** 227.9 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:** 389 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 2769 of 14129 | | Power density | 2845 of 14129 | | Temperature coefficient | 6152 of 14129 | | Weight | 2196 of 14129 | | Warranty | 21 of 14129 | ## Pros - **Module efficiency 22.5-22.8%: peer-group leader** - The JAM54D40 GB achieves 22.5-22.8% module efficiency, outperforming all listed peer comparables: Q-Cells Q.TRON BLACK (22.3%), Solitek SOLRIF D Satin (22.06%), and SunEvo SE6-46SC (21.4%). On a typical 10 kWp residential pitched-roof system, the ~1.4 pp advantage over SunEvo translates to roughly 60-100 Wp more peak power without additional roof area. - **Low temperature coefficient -0.29%/°C (N-type TOPCon)** - N-type TOPCon cells limit thermal power loss to -0.29%/°C (Pmax), vs. -0.35%/°C for standard PERC modules. At a module temperature of 70°C - typical on a Polish summer afternoon - power loss is ~14.5% instead of ~17.5%, delivering measurably more energy yield over the course of a year. - **30-year linear power warranty with LID/PID protection** - JA Solar guarantees ≤1% first-year degradation and ≤0.4%/year thereafter, ensuring ≥87.4% of rated power after 30 years. N-type cells are inherently LID-immune, and the glass-glass encapsulation blocks moisture ingress - the primary PID trigger - delivering stable output across the full warranted lifetime. - **Glass-glass build: durability and fire safety** - The double-glass construction eliminates the risk of backsheet delamination and polymer degradation - the most common failure mode in glass-backsheet modules after 10-15 years. The glass rear surface also improves the fire safety profile of rooftop installations compared to polymeric backsheets. - **BNEF Tier-1, manufacturer at >100 GW/year capacity** - JA Solar is listed on the BNEF Tier-1 solar module manufacturer list for Q1 2026 with >100 GW/year production capacity, placing it among the top global producers. Tier-1 bankability ensures warranty service availability over the full 30-year operating horizon and financial counterparty stability for any claims. ## Cons - **12-year product warranty vs. 25 years at direct rival** - Q-Cells Q.TRON BLACK (peer comparable, 445 Wp, 22.3%) carries a 25-year workmanship warranty, while the JAM54D40 GB covers only 12 years. Mechanical failures - frame cracking, junction-box sealing, glass delamination - occurring after year 13 fall outside the manufacturer's coverage, a meaningful LCOE and risk factor for long-horizon residential investors. - **Elevated module weight: 21.5 kg (glass-glass)** - The double-glass design brings weight to 21.5 kg (1722 × 1134 × 30 mm), approximately 2-3 kg heavier than comparable glass-backsheet modules (~19 kg) in the same power class. On roofs with limited structural load capacity or aging rafter framing, a structural engineering assessment may be required, adding to overall BoS costs. - **Practical bifacial gain on Polish pitched roofs: 2-5%** - The advertised bifacial gain (up to 15-20%) applies to ground-mount or flat-roof systems with high-albedo surfaces (albedo ≥0.3: concrete, white TPO membrane). On the typical Polish single-family pitched roof covered with dark clay tiles or bituminous felt, albedo is 0.05-0.10, limiting real rear-side generation to just 2-5%. The financial premium of bifacial glass-glass technology is therefore weakened in this common residential use case. ## About this series The JAM54D40 GB series consists of advanced N-type modules that set new performance standards in the micro-installation sector. The use of **DeepBlue 4.0 Pro** technology allows for higher efficiency even in low sunlight, which is crucial in the Polish climate. The main distinguishing feature of this series is the **glass-glass construction**, which, combined with bifacial cells, significantly increases the total energy yield by absorbing light reflected from the ground. These panels effectively solve the problem of cell degradation, offering exceptional resistance to LID and PID phenomena, which translates into stable operation for decades. Thanks to the use of **N-type cell technology**, the modules are characterized by a lower temperature coefficient, maintaining high power even on hot days. This solution is dedicated primarily to prosumers looking for uncompromising durability and fire safety. What sets them apart from the competition is the **optimized M10 cell size**, which facilitates installation on pitched roofs while maintaining maximum power density. By choosing the JAM54D40 GB, the investor receives a product with an extended lifespan that maximizes the return on investment thanks to higher long-term efficiency. ## Notable figures - Efficiency of 22.8% is 0.9pp above the \*\*N-type 400-450W\*\* median (21.9%) - Power density of 227.9 W/m² packs 9.5 W/m² more into the same footprint vs \*\*N-type 400-450W\*\* median (218.4 W/m²) - Temperature coefficient of -0.30%/°C matches the \*\*N-type 400-450W\*\* median - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof - Ranked #2769 out of 14129 panels for efficiency in the database ## Questions ### Are the JA Solar JAM54D40 GB panels suitable for a sloped residential roof? Yes, the JAM54D40 GB series works well on standard pitched roofs. The module measures 1722×1134×30 mm and weighs approximately 21.5 kg, making positioning on a roof slope manageable. Keep in mind that the glass-glass construction (dual tempered glass) is heavier than conventional backsheet modules, so it is worth consulting an installer about roof load capacity before installation. ### What is the warranty on JA Solar JAM54D40 GB panels? JA Solar provides a 12-year product warranty covering manufacturing defects and a 30-year linear power warranty. After 30 years the panel is guaranteed to retain at least 87.4% of its nominal power output. JA Solar holds Tier 1 status on the Bloomberg NEF list, confirming the manufacturer's financial stability and the credibility of warranty claims. ### What is N-type cell technology in the JAM54D40 GB and is it worth the premium? N-type cells use phosphorus-doped silicon instead of the boron-doped base used in P-type (PERC) cells. The key benefits are a lower temperature coefficient (-0.29%/°C), meaning less power loss on hot days, and inherent resistance to LID (Light-Induced Degradation). For a prosumer this translates to higher annual energy yield and more stable output across the full 30-year power warranty period. ### Do JAM54D40 GB modules perform well in overcast conditions and the cold temperatures typical of Poland? The DeepBlue 4.0 Pro technology with N-type cells improves efficiency under diffuse irradiance, which is common in Polish climate during autumn and winter. The low temperature coefficient (-0.29%/°C) means the panel can actually perform better on a cold, sunny day than on a hot summer day. This is a notable advantage in Poland, where high-intensity sunlight is limited to just a few months per year. ### How does the bifacial design of the JAM54D40 GB work and how much extra energy can it generate? Bifacial modules have active cells on both sides of the glass, allowing the rear surface to capture light reflected from the ground or nearby surfaces. With a light-colored or white roofing substrate, the additional yield from the rear side is typically 5-15% compared to a standard monofacial module. The glass-glass construction also enhances durability and resistance to environmental stress. ### Which inverters are compatible with JA Solar JAM54D40 GB panels? The JAM54D40 GB series operates in 1500 V DC systems, which is the standard for popular string and hybrid inverters including SMA, Fronius, Huawei, SolarEdge, and Growatt. When designing string configurations, account for the 445 Wp maximum power and an open-circuit voltage (Voc) of approximately 39.4 V. Always verify compatibility using the inverter manufacturer's string sizing tool or consult a certified installer. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/18240062617b58-11e9bd23ee1c.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +50 W, cooler, +2.0 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +45 W, cooler, +1.7 pp | | [Suntech STP-NT11/48QGSF-490](https://comparepv.com/panel/suntech-stp-nt11-48qgsf-490) | 490 W | +45 W, cooler, +1.7 pp | | [JA Solar JAT54S40-485/LR](https://comparepv.com/panel/ja-solar-jat54s40-485-lr) | 485 W | +40 W, cooler, +1.5 pp | | [AIKO AIKO-A485-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a485-mce54mw) | 485 W | +40 W, cooler, +1.5 pp | | [Longi Solar LR7-54HJD-495M](https://comparepv.com/panel/longi-lr7-54hjd-495m) | 495 W | +50 W, cooler, +1.5 pp | | [AIKO AIKO-A485-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a485-mah54mw) | 485 W | +40 W, cooler, +1.5 pp | | [JA Solar JAM54S31-380/MR](https://comparepv.com/panel/ja-solar-jam54s31-380-mr) | 380 W | -65 W, -3.3 pp, -5 yr warranty | | [JA Solar JAM54S31-385/MR](https://comparepv.com/panel/ja-solar-jam54s31-385-mr) | 385 W | -60 W, -3.1 pp, -5 yr warranty | | [JA Solar JAM54D30-390/MB/1500V](https://comparepv.com/panel/ja-solar-jam54d30-390-mb-1500v) | 390 W | -55 W, hotter, -2.9 pp | | [JA Solar JAM54S31-390/MR](https://comparepv.com/panel/ja-solar-jam54s31-390-mr) | 390 W | -55 W, -2.8 pp, -5 yr warranty | | [JA Solar JAM54D30-395/MB/1500V](https://comparepv.com/panel/ja-solar-jam54d30-395-mb-1500v) | 395 W | -50 W, hotter, -2.6 pp | | [JA Solar JAM54S31-395/MR](https://comparepv.com/panel/ja-solar-jam54s31-395-mr) | 395 W | -50 W, -2.6 pp, -5 yr warranty | | [JA Solar JAM54S30-400/MR](https://comparepv.com/panel/ja-solar-jam54s30-400-mr) | 400 W | Hotter, -2.3 pp, -5 yr warranty | | [JA Solar JAM54D30-400/MB/1500V](https://comparepv.com/panel/ja-solar-jam54d30-400-mb-1500v) | 400 W | -45 W, hotter, -2.4 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +65 W, cooler, +2.2 pp | --- Source: https://comparepv.com/panel/ja-solar-jam54d40-445-gb 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.