--- title: "BYD NLBK-24-400 400W Solar Panel - Specs & Review | ComparePV" description: "BYD NLBK-24-400 400W solar panel. Specs: 15.48% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/byd-nlbk-24-400" updated: 2026-09-11 --- # BYD NLBK-24-400 Middle of its segment, modest efficiency 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** BYD - **Model:** NLBK-24-400 - **Series:** AURO N-Type TOPCon Bifacial Module (NLBK-24) - **Rated power:** 400 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 400-450 W (1218 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 400 W | 435 W | Weak - bottom 1% | | | Module efficiency | 15.48% | 22.00% | Weak - bottom 1% | 13,723 | | Power density | 154.8 | 220.2 | Weak - bottom 1% | 13,707 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight (kg) | 30.0 kg | 22.0 kg | Weak - bottom 3% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 15.48% | 22.00% | Weak - bottom 1% | 13,723 | | Power density | 154.8 | 220.2 | Weak - bottom 1% | 13,707 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight per kWp | 75.0 | 51.4 | Weak - bottom 3% | 13,607 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **15.48% module efficiency** - Bottom 1% of the TOPCon 400-450 W segment, against a median of 22.00%. Ranked 13,723rd in the whole database. - **154.8 watts per square metre** - Bottom 1% of the TOPCon 400-450 W segment, against a median of 220.2. Ranked 13,707th in the whole database. - **75.0 kg per kWp** - Bottom 3% of the TOPCon 400-450 W segment, against a median of 51.4. Ranked 13,607th in the whole database. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Tight roof space, roofs where every square metre has to count and weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 400 W - **Efficiency:** 15.48 % - **Voltage at Pmax (Vmp):** 28.63 V - **Current at Pmax (Imp):** 13.99 A - **Open-circuit voltage (Voc):** 34.39 V - **Short-circuit current (Isc):** 14.79 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.300 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.046 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 96 - **Bifacial:** yes ### Physical - **Length:** 2278 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 30.0 kg - **Area:** 2.58 m2 - **Power density:** 154.8 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 % ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 13723 of 14005 | | Power density | 13707 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 13607 of 14005 | | Warranty | 21 of 14005 | ## Pros - **N-Type TOPCon – Low Temperature Coefficient** - The power temperature coefficient is -0.30%/°C, outperforming typical PERC modules (-0.35 to -0.40%/°C). On hot days (e.g., cell temperature of 60°C), power loss is approximately 10.5% versus 13–15% for PERC — a tangible gain in real-world summer energy yield. - **30-Year Linear Power Warranty** - The manufacturer guarantees a maximum annual degradation of 0.50% over 30 years. Leading Tier-1 manufacturers (Jinko, JA Solar, Trina) standardly offer 25-year warranties — the NLBK-24 exceeds them by 5 years, a meaningful advantage for projects subject to bank financing requirements. - **Light Transmittance 5–40% (BIPV)** - Controlled light transmittance makes this series one of the few TOPCon module lines suitable for direct BIPV applications: carports, pergolas, and glazed atrium roofs. This unlocks a market segment inaccessible to standard opaque modules. - **PID Resistance and SMBB Technology** - Cells with a certified PID resistance guarantee protect systems operating at high DC system voltages (up to 1500 V DC). Super Multi Busbar (SMBB) technology reduces losses under micro-shading conditions and improves current collection across all cells. - **BNEF Tier-1 Manufacturer – Bankability** - BYD (founded 1995, headquartered in China) appears on the BNEF Tier-1 list, evidencing documented financing by independent commercial banks for projects exceeding 10 MW. This reduces credit and insurance risk for both investors and installers. ## Cons - **Module Efficiency 14.71–15.48% – Below Peer Comparables** - Module efficiency is significantly lower than the referenced benchmark products: Meyer Burger White at 21.7% and Solaria PowerXT at 20.2%. Even the DMEGC GH400M10T-B48HST achieves 15.48%, matching only the upper bound of the NLBK-24. This is inherent to the semi-transparent construction; however, for a standard rooftop installation it means requiring approximately 30–35% more surface area to achieve the same energy yield as fully opaque TOPCon modules. - **12-Year Product Warranty – Below Market Leaders** - The 12-year materials and workmanship warranty is notably shorter than Maxeon's 40-year offering and the 25-year standard provided by Jinko Solar, JA Solar, and Trina Solar. For projects involving long-term bank financing or lease structures, this may present a barrier during underwriting negotiations with insurers. ## About this series The BYD AURO N-Type TOPCon Bifacial Module (NLBK-24) series is designed for installations where not only energy yield but also performance in demanding conditions are important. These modules are based on **N-Type TOPCon solar cells**, which ensure stable energy production over the long term and high resistance to typical degradation mechanisms. A key advantage of the NLBK-24 is **its bifacial design** - the panel can also utilize reflected light from the ground, which helps improve annual energy yield without increasing the installation area. This works well on bright roofs, with racking systems on flat roofs, and in ground-mounted systems. Another distinguishing feature of this series is **controlled light transmission**, which makes the module suitable for applications where partial illumination is required (e.g., awnings, carports). The use of **SMBB technology** supports better current collection and reduces losses due to shading, while **PID resistance** ensures reliable operation in installations exposed to harsh electrical conditions. ## Notable figures - Module efficiency of 15.5% is 6.5pp below average for \*\*TOPCon 400-450W\*\* panels (median: 22.0%) - Power density of 154.8 W/m² is 65.4 W/m² below \*\*TOPCon 400-450W\*\* median (220.2 W/m²) - needs more roof space - At -0.30%/°C, hot weather performance is typical for \*\*TOPCon 400-450W\*\* panels - At 30.0 kg, this panel is 8.0 kg heavier than the \*\*TOPCon 400-450W\*\* median (22.0 kg) - more demanding for installation crews - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces ## Questions ### What warranty does BYD offer on the AURO NLBK-24 series panels? BYD provides a 12-year product warranty (covering defects in workmanship and materials) and a 30-year linear power output warranty for the AURO NLBK-24 series. This means the manufacturer guarantees that module efficiency will remain above the declared threshold for three decades. By current market standards, this is a solid offering — particularly given that BYD is a recognized Tier 1 manufacturer. ### What does the bifacial design of the BYD AURO NLBK-24 panels involve, and does it genuinely increase energy yield? The NLBK-24 modules feature an active surface on both sides of the panel. The rear side captures light reflected from the roof, ground, or other bright surfaces, which can increase annual energy yield by several to over ten percent compared to conventional monofacial modules. The bifacial gain is most pronounced on white ballasted rooftops, light-colored gravel substrates, or ground-mounted systems with highly reflective ground surfaces. ### How does N-Type TOPCon cell technology differ from older PERC cells? The N-Type TOPCon cells used in the NLBK-24 feature a lower temperature coefficient (approximately -0.30%/°C), meaning they experience smaller power losses on hot days compared to typical PERC cells. They also exhibit significantly higher resistance to LID (light-induced degradation), resulting in more stable energy yield over the entire service life of the module. Module efficiency reaches 22.79%, placing it well above the performance range of conventional PERC panels. ### Are the BYD AURO NLBK-24 panels suitable for carport or terrace canopy applications? Yes. The NLBK-24 series is one of the few options available with adjustable light transmittance in the range of 5–40%, making it well suited for shaded carports, garage canopies, and terrace overhangs. The modules allow partial transmission of natural light into the covered space while continuing to generate electricity. It is advisable to confirm the exact transmittance level required for a specific project with the installer prior to procurement. ### What is the rated power output of a single BYD AURO NLBK-24 panel, and how many panels are needed for a residential installation? A single NLBK-24 module has a peak power output of 400 Wp. For a typical residential system rated at 6–10 kWp, between 15 and 25 modules are required. The exact number depends on available roof area, orientation, tilt angle, and projected energy consumption. We recommend obtaining a quote from a certified installer who can size the array based on the actual consumption profile of the property. ### Do the BYD AURO NLBK-24 panels perform well in overcast conditions or during cold winter months? Yes. N-Type TOPCon technology translates into superior performance under diffuse irradiance conditions — including overcast skies, fog, and smog — which is particularly relevant in the Polish climate for a significant portion of the year. The low temperature coefficient also means that cold, sunny winter days can yield surprisingly strong output. In addition, the modules' PID (potential-induced degradation) resistance protects against performance loss in the high-humidity conditions characteristic of Polish autumn and spring seasons. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/byd-nlbk-24-967c52c37161.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Luxor Solar LX-440M/182-108+GG](https://comparepv.com/panel/luxor-solar-lx-440m-182-108-gg) | 440 W | Cooler, lighter, +7.6 pp | | [Just Solar JST-EDMH-(445-465)W-TD (450W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-450w-class) | 450 W | +50 W, lighter, +7.6 pp | | [Q-SUN Solar QNN182-HG450-54](https://comparepv.com/panel/qn-solar-pv-limited-qnn182-hg450-54) | 450 W | +50 W, lighter, +7.6 pp | | [Huayao HY440-N108BDD](https://comparepv.com/panel/huayao-hy440-n108bdd) | 450 W | +50 W, lighter, +7.6 pp | | [BYD NLBK-27-450](https://comparepv.com/panel/byd-nlbk-27-450) | 450 W | +50 W, lighter, +7.6 pp | | [Renesola RS41-450NBG-E3](https://comparepv.com/panel/renesola-rs41-450nbg-e3) | 450 W | +50 W, lighter, +7.6 pp | | [BYD NLBK-24-380](https://comparepv.com/panel/byd-nlbk-24-380) | 380 W | -20 W, -0.8 pp | | [BYD NLBK-24-385](https://comparepv.com/panel/byd-nlbk-24-385) | 385 W | -15 W, -0.6 pp | | [BYD NLBK-24-390](https://comparepv.com/panel/byd-nlbk-24-390) | 390 W | -10 W, -0.4 pp | | [BYD NLBK-24-395](https://comparepv.com/panel/byd-nlbk-24-395) | 395 W | Very close match | | [BYD MLTK-36 530W](https://comparepv.com/panel/byd-mltk-36-530w) | 530 W | +130 W, +5.0 pp, -5 yr warranty | | [BYD MLTK-36 535W](https://comparepv.com/panel/byd-mltk-36-535w) | 535 W | +135 W, +5.2 pp, -5 yr warranty | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +250 W, cooler, +9.7 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +245 W, cooler, +9.5 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | +240 W, cooler, +9.3 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | +235 W, cooler, +9.1 pp | --- Source: https://comparepv.com/panel/byd-nlbk-24-400 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.