--- title: "JA Solar JAT54S40-475/LR 475W Solar Panel - Specs & Review | ComparePV" description: "JA Solar JAT54S40-475/LR 475W solar panel. Specs: 23.80% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ja-solar-jat54s40-475-lr" updated: 2026-09-11 --- # JA Solar JAT54S40-475/LR Light for its output, no clear weak spot 1,089 panels in the segment TOPCon 450-500 W ## Identity - **Manufacturer:** JA Solar - **Model:** JAT54S40-475/LR - **Series:** JAT54S40 LR (n-type Monofacial Module) - **Rated power:** 475 W - **Cell technology:** TOPCon ## How it compares Compared against segment TOPCon 450-500 W (1089 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 475 W | 465 W | Typical | | | Module efficiency | 23.80% | 22.52% | Strong - top 3% | 433 | | Power density | 237.7 | 225.2 | Strong - top 3% | 467 | | Temperature coefficient | -0.260 | -0.290 | Strong - top 3% | 511 | | Weight (kg) | 19.3 kg | 24.0 kg | Strong - top 1% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.80% | 22.52% | Strong - top 3% | 433 | | Power density | 237.7 | 225.2 | Strong - top 3% | 467 | | Temperature coefficient | -0.260 | -0.290 | Strong - top 3% | 511 | | Weight per kWp | 40.6 | 52.2 | Strong - top 1% | 165 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **40.6 kg per kWp** - Top 1% of the TOPCon 450-500 W segment, against a median of 52.2. Ranked 165th in the whole database. - **23.80% module efficiency** - Top 3% of the TOPCon 450-500 W segment, against a median of 22.52%. Ranked 433rd in the whole database. - **237.7 watts per square metre** - Top 3% of the TOPCon 450-500 W segment, against a median of 225.2. Ranked 467th in the whole database. - **Best for:** Residential, commercial, shaded-installations and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 475 W - **Efficiency:** 23.80 % - **Voltage at Pmax (Vmp):** 34.87 V - **Current at Pmax (Imp):** 13.63 A - **Open-circuit voltage (Voc):** 41.03 V - **Short-circuit current (Isc):** 14.90 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.260 %/degC - **Temperature coefficient of Voc:** -0.220 %/degC - **Temperature coefficient of Isc:** 0.050 %/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:** 19.3 kg - **Area:** 2.00 m2 - **Power density:** 237.7 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 83.5 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.55 % - **Output after 30 years:** 394 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 433 of 14005 | | Power density | 467 of 14005 | | Temperature coefficient | 511 of 14005 | | Weight | 165 of 14005 | | Warranty | 21 of 14005 | ## Pros - **N-type TOPCon – low LID and superior thermal performance** - N-type TOPCon cells exhibit first-year LID degradation below 1%, compared to 1.5–2% typical for P-type PERC. The improved temperature coefficient (~-0.30%/°C vs. ~-0.35%/°C for PERC) reduces power losses on hot days — particularly relevant for rooftop installations with limited airflow. - **23.5–24.3% efficiency – top of the 54-cell segment** - Peak efficiency of 24.3% matches the best available peers (Gokin GK-5-54HG / GK-5-54HGb: 24.3%) and exceeds the ZNShine ZXM7-UHLD120 series (22.47%) by over 1.8 percentage points. In practice this translates to ~8% more energy output per unit of roof area compared to lower-efficiency alternatives. - **30-year linear power warranty** - JA Solar guarantees a linear degradation schedule for 30 years, placing this series at the premium end of N-type module warranty terms. A 30-year power guarantee improves LCOE predictability and is a key bankability requirement for commercial project financing. - **BNEF Tier-1 bankable manufacturer (Q1 2026)** - JA Solar maintains continuous BNEF Tier-1 status and belongs to the group of manufacturers shipping over 80 GWp annually (H1 2026). Tier-1 standing is required by most non-recourse project finance lenders, facilitating debt financing for commercial PV installations using this module. - **GFI (gapless) cell layout – maximized active area** - The GFI design eliminates inter-cell gaps, increasing the active surface area per module and delivering a uniform, all-black aesthetic. This is a meaningful advantage for architecturally sensitive projects (residential and multi-family buildings) without sacrificing power output. ## Cons - **15-year product warranty – below market standard** - The JAT54S40 LR series carries a 15-year workmanship/product warranty, whereas most competing N-type TOPCon modules from Tier-1 manufacturers (Jinko Tiger Neo, Trina Vertex S+, Canadian Solar HiHero) now offer 25-year product warranties as standard. The 10-year gap in defect coverage is a tangible risk factor for installations planned over a 25–30-year lifecycle. - **Monofacial only – no rear-side energy gain** - The series is strictly monofacial (is\_bifacial: false), whereas the peer-comparable Gokin GK-5-54HGb offers a bifacial variant at the same peak power of 485 W and identical 24.3% efficiency. On high-albedo substrates (white gravel, light-colored roofing), bifacial modules can yield 5–15% additional energy. The JAT54S40 LR is not the optimal choice for such installations. ## About this series JA Solar JAT54S40 LR series modules are monofacial solar panels based on **N-type TOPCon** cells, designed for stable energy production in real rooftop conditions. The key advantage is their **very low LID degradation**, ensuring the installation maintains high efficiency for a longer period without the typical drop-off after commissioning. In practice, this means more predictable yields and better profitability throughout the system's lifespan. Another notable feature is the **improved temperature coefficient**, which minimizes power losses on hot days - particularly important for dark rooftops and installations with poor ventilation. The modules utilize the **GFI (gapless)** structure, supporting efficient surface utilization and an aesthetic appearance. An additional benefit is **optimized performance under low-light conditions**, which aids during transitional periods and light cloud cover. This is an excellent choice for single-family homes, multi-family buildings, and commercial projects, where durability, reliable performance, and high workmanship standards matter. ## Notable figures - Efficiency of 23.8% is 1.3pp above the \*\*TOPCon 450-500W\*\* median (22.5%) - Power density of 237.7 W/m² packs 12.5 W/m² more into the same footprint vs \*\*TOPCon 450-500W\*\* median (225.2 W/m²) - -0.26%/°C temperature coefficient (median: -0.29%/°C) - retains ~1% more power at high temperatures - Weight of 19.3 kg (4.7 kg below \*\*TOPCon 450-500W\*\* median of 24.0 kg) allows easier transport and roof mounting - Ranked #433 out of 14005 panels for efficiency in the database ## Questions ### What warranty does the JA Solar JAT54S40 LR come with, and what exactly does it cover? The JAT54S40 LR series carries a 15-year product warranty covering manufacturing defects and a 30-year power output warranty. After 30 years of operation the module is guaranteed to retain at least 88.85% of its rated power. The product warranty protects against material and workmanship defects, while the power warranty safeguards against excessive degradation throughout the system's operational life. ### What is TOPCon technology in the JAT54S40 LR panels and is it worth the premium? TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell technology that minimizes carrier recombination at the silicon-metal interface. For the JAT54S40 LR this translates to module efficiency up to 24.3%, very low LID degradation at startup, and an improved temperature coefficient of -0.26%/°C compared to standard PERC cells. For a rooftop installation it means higher energy yield over the entire system lifetime. ### Do the JA Solar JAT54S40 LR panels perform well in cloudy conditions and low irradiance? Yes. The JAT54S40 LR series is optimized for low-light performance. N-type TOPCon cells respond better to diffuse irradiance than PERC-based modules, which matters in climates with frequent overcast days. The modules begin generating meaningful power at irradiance levels of just a few dozen watts per square meter, helping to improve annual energy yield during transitional seasons. ### What is the power output of the JAT54S40 LR and how many panels are needed for a home installation? Each JAT54S40 LR module delivers up to 485 Wp at STC. A typical 6.5 kWp residential system requires about 14 panels, while a 10 kWp system needs approximately 21 modules. The high per-panel wattage means fewer modules are needed compared to older PERC products, which is a real advantage when roof space is limited. ### Is the JAT54S40 LR a bifacial panel that generates power from both sides? No. The JAT54S40 LR is a monofacial module and generates electricity only from its front surface. This makes it a straightforward choice for standard rooftop installations where the rear side is not exposed to reflected light. Compared to bifacial modules it is simpler to plan and price, while the N-type TOPCon cell technology still delivers high efficiency of 23.3–24.3%. ### How does low LID degradation in the JAT54S40 LR affect the return on investment? LID (Light-Induced Degradation) is the power drop that conventional silicon cells experience during their first hours of sun exposure. The N-type TOPCon cells used in the JAT54S40 LR are virtually immune to this effect, so the module operates close to its rated power from day one. For a rooftop system this means higher energy output in the early years and more predictable LCOE compared to older P-type modules. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/284b8300e8d933e-22f6664dd59e.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +35 W, heavier, +1.2 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +20 W, heavier, +1.0 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +30 W, heavier, +0.9 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +15 W, heavier, +0.7 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +25 W, heavier, +0.7 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +25 W, heavier, +0.7 pp | | [JA Solar NS-420MH-108](https://comparepv.com/panel/ja-solar-ns-420mh-108) | 420 W | -55 W, heavier, -2.8 pp | | [JA Solar JAM54D41-430/LB](https://comparepv.com/panel/ja-solar-jam54d41-430-lb-1) | 430 W | -45 W, hotter, -2.3 pp | | [JA Solar JAM54S40-435/LR](https://comparepv.com/panel/ja-solar-jam54s40-435-lr) | 435 W | -40 W, hotter, -2.0 pp | | [JA Solar JAM54S40-440/LR](https://comparepv.com/panel/ja-solar-jam54s40-440-lr) | 440 W | -35 W, hotter, -1.8 pp | --- Source: https://comparepv.com/panel/ja-solar-jat54s40-475-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.