--- title: "BYD NLBK-27-435 435W Solar Panel - Specs & Review | ComparePV" description: "BYD NLBK-27-435 435W solar panel. Specs: 22.28% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/byd-nlbk-27-435" updated: 2026-09-11 --- # BYD NLBK-27-435 Space saver, no clear weak spot 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** BYD - **Model:** NLBK-27-435 - **Series:** AURO NLBK-27 - **Rated power:** 435 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) | 435 W | 435 W | Typical | | | Module efficiency | 22.28% | 22.00% | Strong - top 24% | 5,403 | | Power density | 222.8 | 220.2 | Strong - top 17% | 5,150 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight (kg) | 22.9 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 | 22.28% | 22.00% | Strong - top 24% | 5,403 | | Power density | 222.8 | 220.2 | Strong - top 17% | 5,150 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight per kWp | 52.6 | 51.4 | Typical | 6,276 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **222.8 watts per square metre** - Top 17% of the TOPCon 400-450 W segment, against a median of 220.2. - **22.28% module efficiency** - Top 24% of the TOPCon 400-450 W segment, against a median of 22.00%. - **Best for:** Residential, commercial and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 435 W - **Efficiency:** 22.28 % - **Voltage at Pmax (Vmp):** 32.59 V - **Current at Pmax (Imp):** 13.35 A - **Open-circuit voltage (Voc):** 39.16 V - **Short-circuit current (Isc):** 13.80 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 - **Bifacial:** yes - **Bifacial gain:** 30.00 ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 22.9 kg - **Area:** 1.95 m2 - **Power density:** 222.8 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 % - **Output after 30 years:** 380 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 5403 of 14005 | | Power density | 5150 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 6276 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Up to 23.04% Efficiency – Segment-Leading Performance** - The top-tier variant in the series (450 Wp) achieves 23.04% module efficiency, matching direct market competitors such as SunKean/Sunket SKT430~450M10-108D5 while outperforming the Suntech Ultra V Pro mini Full Black (22.5%). This translates to maximum energy yield from limited rooftop area. - **30-Year Linear Power Output Warranty** - BYD guarantees linear power output for 30 years with annual degradation below 0.7%, surpassing the 25-year industry standard offered by most Tier-1 competitors (e.g., JA Solar DeepBlue 4.0, Trina Vertex S+). The extended warranty horizon directly improves the IRR of residential prosumer installations. - **Low Temperature Coefficient of –0.30%/°C** - A temperature coefficient of –0.30%/°C places this module at the top of the N-type TOPCon class (typical range: –0.30% to –0.35%/°C). In Polish climatic conditions, where module temperatures reach 60–70°C in summer, this results in measurably higher daily energy yield compared to PERC panels with coefficients of –0.36% to –0.40%/°C. - **N-Type Cells with LID/LeTID Immunity** - TOPCon technology built on an N-type substrate eliminates light-induced degradation (LID) characteristic of older P-type PERC cells. This delivers higher real-world yield in the early years of operation, during which PERC installations can lose up to 1–2% of nominal power due to the LID effect. - **BYD – Bankable Tier-1 Manufacturer Since 1995** - BYD has maintained continuous bankable Tier-1 status (BNEF) for many years, reducing investment financial risk and simplifying project financing. The company's track record since 1995 and its diversified business portfolio — spanning batteries and electric vehicles — further strengthens the long-term creditworthiness assessment of the warranty guarantor. ## Cons - **Product Warranty Limited to 12 Years** - Premium N-type competitors (Jinko Tiger Neo, JA Solar DeepBlue 4.0, REC Alpha Pure-R) routinely offer a 15-year product (workmanship) warranty as standard. The 3-year shortfall can serve as a negotiating point during proposal comparisons, particularly for installers structuring long-term B2B service agreements. - **Reduced Bifacial Factor in the Full Black Version** - The dark rear backsheet (designated "BK" in the NLBK product code) absorbs reflected albedo irradiance rather than transmitting it. In practice, the bifacial gain of the Full Black variant is approximately 5–10%, whereas standard white-backsheet or glass-glass equivalents achieve 10–20%. On rooftops with dark surface coverings, the benefit of bifaciality is marginal — the aesthetic advantage comes at the cost of real-world energy yield. ## About this series The BYD AURO NLBK-27 solar panel series focuses on delivering maximum power per square meter of surface area, utilizing the potential of N-type cells. Thanks to the use of **modern TOPCon technology**, these modules exhibit significantly lower degradation over the years, which directly addresses the problem of declining installation efficiency in the long term. This solution is primarily dedicated to prosumers who value the **full aesthetics of the Full Black design**, which allows the cells to blend harmoniously into the roof covering without losing their technical parameters. A key advantage over standard solutions is the **outstanding resistance to the LID and LeTID effects**, providing investors with peace of mind and a faster return on investment. These panels perform excellently in the Polish climate thanks to their **low temperature coefficient**, allowing for high yields even on the hottest days of the year. The solid frame construction translates into **increased resistance to snow and wind loads**, distinguishing this product from budget alternatives prone to micro-cracks. By choosing the AURO NLBK-27 series, the user opts for a synergy of reliability and innovation that defines modern premium-class photovoltaics for homes and businesses. ## Notable figures - Efficiency of 22.3% matches the \*\*TOPCon 400-450W\*\* median - At 222.8 W/m² power density, roof space requirements are typical for \*\*TOPCon 400-450W\*\* panels - Temperature coefficient of -0.30%/°C matches the \*\*TOPCon 400-450W\*\* median - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces - #5403 for efficiency, #6093 for temperature performance out of 14005 panels ## Questions ### What warranty is provided for the BYD AURO NLBK-27 panels? The BYD AURO NLBK-27 series comes with a 12-year product warranty covering manufacturing defects and a 30-year linear power output warranty. Thanks to TOPCon technology, annual power degradation is below 0.4%, meaning that after three decades the modules will still operate at output levels significantly higher than older polycrystalline cells. As a Tier 1 manufacturer, BYD is widely recognized as a reliable guarantor of these commitments. ### Is the BYD AURO NLBK-27 a bifacial panel, and is the price premium justified? Yes, the NLBK-27 is a bifacial module featuring dual-sided light absorption with a bifaciality factor exceeding 80%. This means the rear side of the panel generates additional energy from irradiance reflected off the roof surface, ground, or surrounding environment. In practice, with a light-colored roofing membrane or reflective substrate, real-world energy yield can exceed the rated nominal power of 450 W by several to over ten percent. ### What does the Full Black finish mean for the NLBK-27 series, and does it affect performance? The NLBK designation indicates a Full Black configuration — black frame, black cells, and black backsheet. Aesthetically, the panel blends seamlessly with dark roofing materials, which is a significant advantage for prosumers who prioritize the visual appearance of their roof. Contrary to common concerns, the black finish does not materially reduce efficiency: the N-type TOPCon cells already operate at high conversion efficiency, and module temperature is kept in check by a low temperature coefficient. ### How do the BYD AURO NLBK-27 panels perform under high summer temperatures in Poland? The NLBK-27 series features a temperature coefficient of -0.30%/°C, which ranks among the best results in the premium panel segment. This means that even on hot summer days when the module heats up to 60–70 °C, the resulting power loss is noticeably lower than with older PERC cells (-0.35%/°C or higher). This translates into measurably higher energy yields during Polish summers. ### How does TOPCon technology in the BYD AURO NLBK-27 differ from the widely used PERC, and why does it matter? TOPCon is an N-type cell architecture featuring an additional tunnel oxide and polysilicon passivation layer that eliminates the LID (Light-Induced Degradation) and LeTID (Light and elevated Temperature Induced Degradation) effects responsible for early power loss in PERC cells. In practical terms, the NLBK-27 does not suffer the few-percent power drop typically seen in PERC modules during the first months of operation, and annual degradation below 0.4% delivers a better return on investment over the full 30-year power warranty period. ### Is the 450 W BYD AURO NLBK-27 suitable for a typical residential rooftop installation? Yes, the 450 W power rating places the NLBK-27 in the high-performance segment purpose-built for prosumer installations. Fewer modules are required to reach the target system capacity (e.g., 10 kWp), which reduces both installation labor costs and roof load. The panel is well suited for pitched and flat roofs alike, and its robust construction provides high resistance to the snow and wind loads characteristic of the Polish climate. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/byd-nlbk-27-ee3c57aa06ae.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [JA Solar JAT54S40-485/LR](https://comparepv.com/panel/ja-solar-jat54s40-485-lr) | 485 W | +50 W, cooler, +2.0 pp | | [AIKO AIKO-A485-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a485-mce54mw) | 485 W | +50 W, cooler, +2.0 pp | | [AIKO AIKO-A485-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a485-mah54mw) | 485 W | +50 W, cooler, +2.0 pp | | [Gokin GK-5-54HG-485M](https://comparepv.com/panel/gokin-gk-5-54hg-485m) | 485 W | +50 W, cooler, +2.0 pp | | [Heckert Solar ZEUS 3.0+ 108 485WP](https://comparepv.com/panel/heckert-solar-zeus-3-0-108-485wp) | 485 W | +50 W, cooler, +2.0 pp | | [BYD NLK-27-425W](https://comparepv.com/panel/byd-nlk-27-425w) | 425 W | Lighter, -0.5 pp, -5 yr warranty | | [BYD NLBK-27-430](https://comparepv.com/panel/byd-nlbk-27-430) | 430 W | -0.3 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +75 W, cooler, +2.7 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +60 W, cooler, +2.5 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +70 W, cooler, +2.4 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +55 W, cooler, +2.2 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +65 W, cooler, +2.2 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +65 W, cooler, +2.2 pp | --- Source: https://comparepv.com/panel/byd-nlbk-27-435 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.