--- title: "BYD NLK-27-425W 425W Solar Panel - Specs & Review | ComparePV" description: "BYD NLK-27-425W 425W solar panel. Specs: 21.76% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/byd-nlk-27-425w" updated: 2026-09-11 --- # BYD NLK-27-425W Middle of its segment, short guarantee 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** BYD - **Model:** NLK-27-425W - **Series:** NLK-27 - **Rated power:** 425 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) | 425 W | 435 W | Typical | | | Module efficiency | 21.76% | 22.00% | Typical | 7,285 | | Power density | 217.6 | 220.2 | Typical | 7,172 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight (kg) | 20.6 kg | 22.0 kg | Typical | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 7% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.76% | 22.00% | Typical | 7,285 | | Power density | 217.6 | 220.2 | Typical | 7,172 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight per kWp | 48.5 | 51.4 | Typical | 2,303 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 7% | 9,798 | ### Watch out for - **25 year performance warranty** - Bottom 7% of the TOPCon 400-450 W segment, against a median of 30 yrs. Ranked 9,798th in the whole database. - **Best for:** Residential and commercial. - **Not ideal for:** Owners who want a long output guarantee. ## Specification ### Electrical - **Rated power (Pmax):** 425 W - **Efficiency:** 21.76 % - **Voltage at Pmax (Vmp):** 32.18 V - **Current at Pmax (Imp):** 13.21 A - **Open-circuit voltage (Voc):** 38.75 V - **Short-circuit current (Isc):** 13.66 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:** 108 ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 20.6 kg - **Area:** 1.95 m2 - **Power density:** 217.6 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 85.8 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.55 % - **Output after 30 years:** 353 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 7285 of 14005 | | Power density | 7172 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 2303 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Up to 23.04% Efficiency – Segment Leader** - The 450 Wp variant achieves 23.04% efficiency, placing the NLK-27 on par with the best comparable models (SunKean SKT430~450M10-108D5: 23.04%). The Suntech Ultra V Pro mini series in the same power range tops out at 22.5% — more than half a percentage point lower — a measurable advantage when planning installations on roof space-constrained sites. - **Low Temperature Coefficient: -0.30%/°C** - N-type TOPCon technology delivers a Pmax temperature coefficient of -0.30%/°C, outperforming typical PERC modules (-0.35% to -0.40%/°C). Under Polish conditions, where module temperatures can reach 60–75°C above STC in summer, this translates to 1.5–3% higher energy yield compared to legacy technologies. - **Zero LID and Low Degradation \<0.7%/year** - N-type cells are structurally immune to Light-Induced Degradation (LID), and the warranted annual degradation rate below 0.7% ensures retention of 85.8% of nominal power after 25 years. For a typical 10 kWp system, this means 500–800 kWh/year more production in year 20 compared to a PERC module with a standard degradation profile. - **BNEF Tier-1 Manufacturer, Operational Since 1995** - BYD is listed among BNEF bankable manufacturers (Q1 2026), facilitating non-recourse project financing and satisfying the requirements of many lending institutions for utility-scale PV projects. The scale and operational track record of the BYD Group (since 1995) significantly reduces the risk of the warranty guarantor ceasing operations before the 25-year power warranty expires. - **Bifacial + SMBB for Higher Yield in Ground-Mount Applications** - The bifacial design enables absorption of light reflected from the ground surface, delivering +5–15% yield gain in ground-mounted installations with light-colored gravel or concrete (albedo >0.25). SMBB (multi-busbar) technology further reduces losses under partial shading and lowers series resistance — critical for longer strings in large-scale PV farms. ## Cons - **Product Warranty Limited to 12 Years** - Premium-tier manufacturers such as REC Group (20 years) and Q CELLS (15 years) offer longer coverage against material and workmanship defects. The BYD NLK-27's 12-year product warranty may be a limiting factor for commercial installations with a contractual horizon of 15+ years, where mechanical or electrical defects arising after that period fall entirely on the asset owner. ## About this series The BYD NLK-27 series is a series of N-Type TOPCon bifacial modules designed for high performance in real-world conditions, even when weather is less than ideal. Thanks to its **bifacial design**, the panel can also utilize reflected light from the ground, which helps to increase energy production on roofs, gravel, or in ground-mounted installations. The use of **N-type cells in the TOPCon technology** results in more stable operation and a lower risk of performance degradation over time, and the claimed **Zero LID resistance** is important for investors seeking long-term returns. The NLK-27 also features **SMBB (multi-busbar) technology**, which improves current collection and better handles partial shading, reducing losses. In practice, this means more predictable performance and easier installation design. It is a good choice for single-family homes, businesses, and PV farms, especially where **high compatibility with inverters and trackers**, and resistance to demanding operating environments are important. ## Notable figures - Efficiency of 21.8% matches the \*\*TOPCon 400-450W\*\* median - At 217.6 W/m² power density, roof space requirements are typical for \*\*TOPCon 400-450W\*\* panels - At -0.30%/°C, hot weather performance is typical for \*\*TOPCon 400-450W\*\* panels - 20.6 kg weight - 1.4 kg lighter than \*\*TOPCon 400-450W\*\* median (22.0 kg), reducing installation effort - In the top 52% for efficiency among all TOPCon panels ## Questions ### What warranty is offered on the BYD NLK-27 panels? The BYD NLK-27 series comes with a 12-year product warranty covering material and manufacturing defects, as well as a 25-year linear power output warranty. After 25 years, the panel is guaranteed to retain at least 85.8% of its original rated power. BYD is a Tier 1 manufacturer, which means the company has the financial stability to honor warranty claims throughout the entire warranty period. ### What is TOPCon technology in the BYD NLK-27 panels, and is it worth the premium? TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell technology in which a thin tunnel oxide layer suppresses electron recombination, increasing both module efficiency and long-term stability. In practice, the NLK-27 modules achieve efficiencies of up to 23.04% and exhibit Zero LID (Light-Induced Degradation) resistance — meaning they do not suffer the initial power loss that is a well-known weakness of older P-type cells. For the end investor, this translates into higher energy yields and a better return on investment over the 25-year system lifetime. ### Are the BYD NLK-27 panels suitable for a pitched roof on a single-family home? Yes, the NLK-27 series — with power output up to 450 Wp, dimensions of 1722×1134×35 mm, and a weight of approximately 20.6 kg — is fully compatible with standard residential roofing structures. Installation on a pitched roof requires no non-standard mounting accessories. The SMBB (Super Multi-Busbar) technology improves resilience to partial shading caused by chimneys or antennas, which is a significant advantage for installations on typical gable roofs. ### How do the BYD NLK-27 panels perform in low temperatures and overcast conditions? N-type TOPCon cells feature a low temperature coefficient of -0.30%/°C, meaning that in cold weather the panels lose less power than older P-type modules. During winter, when ambient air temperatures are low, the modules can operate closer to their nominal rated power. The NLK-27 series therefore performs well in the Polish climate, where cool but sunny days in spring and autumn are common. ### Is BYD a reliable solar panel manufacturer? BYD (Build Your Dreams) is a Chinese corporation classified as a Tier 1 manufacturer according to the BloombergNEF ranking, which reflects strong financial stability and the demonstrated ability to fulfill long-term warranty obligations. The company is one of the world's largest producers of batteries and energy components. The NLK-27 series is manufactured by BYD Solar, a division with extensive experience serving European markets. ### Which inverters are compatible with the BYD NLK-27 panels? The NLK-27 modules, rated at 425–450 Wp, offer broad compatibility with popular inverters available in Poland, including SMA, Fronius, Huawei, SolarEdge, and Growatt. The open-circuit voltage (Voc) typical of 450 W panels allows flexible string design for most single-phase and three-phase inverters. It is nonetheless recommended to verify the specific electrical parameters of any given system configuration with a qualified PV system designer. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/byd-nlk-27-a2b1685e000e.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Maxeon SPR-MAX7-475](https://comparepv.com/panel/maxeon-spr-max7-475) | 475 W | +50 W, +2.2 pp, +15 yr warranty | | [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 | +40 W, +2.0 pp, +5 yr warranty | | [JA Solar JAT54S40-475/LR](https://comparepv.com/panel/ja-solar-jat54s40-475-lr) | 475 W | +50 W, +2.0 pp, +5 yr warranty | | [Tongwei TWMNH-48HW475](https://comparepv.com/panel/tongwei-solar-twmnh-48hw475) | 475 W | +50 W, +2.0 pp, +5 yr warranty | | [Astronergy CHSM48RN(DG)/F-BH-475](https://comparepv.com/panel/astronergy-chint-new-energy-technology-co-ltd-chsm48rn-dg-f-bh-475) | 475 W | +50 W, +2.0 pp, +5 yr warranty | | [AIKO AIKO-A475-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a475-mce54mw) | 475 W | +50 W, +2.0 pp, +5 yr warranty | | [AIKO AIKO-A475-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a475-mah54mw) | 475 W | +50 W, +2.0 pp, +5 yr warranty | | [BYD NLBK-27-430](https://comparepv.com/panel/byd-nlbk-27-430) | 430 W | Heavier, +0.3 pp, +5 yr warranty | | [BYD NLBK-27-435](https://comparepv.com/panel/byd-nlbk-27-435) | 435 W | Heavier, +0.5 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +85 W, cooler, +3.2 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +70 W, +3.0 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +80 W, cooler, +2.9 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +65 W, +2.7 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +75 W, cooler, +2.7 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +75 W, +2.7 pp, +5 yr warranty | --- Source: https://comparepv.com/panel/byd-nlk-27-425w Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.