--- title: "BYD NLBK-36-590 590W Solar Panel - Specs & Review | ComparePV" description: "BYD NLBK-36-590 590W solar panel. Specs: 22.84% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/byd-nlbk-36-590-1" updated: 2026-09-11 --- # BYD NLBK-36-590 Efficiency leader, no clear weak spot 1,017 panels in the segment TOPCon 550-600 W ## Identity - **Manufacturer:** BYD - **Model:** NLBK-36-590 - **Series:** AURO N NLBK-36 - **Rated power:** 590 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 550-600 W (1017 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 590 W | 580 W | Strong - top 18% | | | Module efficiency | 22.84% | 22.44% | Strong - top 15% | 2,617 | | Power density | 228.4 | 224.4 | Strong - top 17% | 2,598 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight (kg) | 32.0 kg | 31.2 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.84% | 22.44% | Strong - top 15% | 2,617 | | Power density | 228.4 | 224.4 | Strong - top 17% | 2,598 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight per kWp | 54.2 | 53.8 | Typical | 8,477 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **22.84% module efficiency** - Top 15% of the TOPCon 550-600 W segment, against a median of 22.44%. - **228.4 watts per square metre** - Top 17% of the TOPCon 550-600 W segment, against a median of 224.4. - **Best for:** Residential, commercial, utility-scale, shaded-installations and cold-climate. ## Specification ### Electrical - **Rated power (Pmax):** 590 W - **Efficiency:** 22.84 % - **Voltage at Pmax (Vmp):** 42.66 V - **Current at Pmax (Imp):** 13.84 A - **Open-circuit voltage (Voc):** 51.28 V - **Short-circuit current (Isc):** 14.63 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:** 144 - **Bifacial:** yes - **Bifacial gain:** 32.00 ### Physical - **Length:** 2278 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 32.0 kg - **Area:** 2.58 m2 - **Power density:** 228.4 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:** 516 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 2617 of 14005 | | Power density | 2598 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 8477 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Up to 23.23% Efficiency in Full Black Configuration** - Peak module efficiency reaches 23.23% — matching the top-performing peer in this comparison (Powitt M10 N-type 23.23%, Tongwei TWMND 23.2%) and exceeding the Talesun BISTAR by 1.73 percentage points (21.5%). Achieving this efficiency level in a Full Black variant (light-absorbing rear glass or black backsheet) is technically demanding and validates cell quality. - **TOPCon N-type: Temperature Coefficient and LID** - The Pmax temperature coefficient is -0.30%/°C (source: BYD solar.byd.com/en/products/auro-n/nlbk-36/), outperforming typical P-type PERC modules (-0.35%/°C). N-type TOPCon cells also exhibit significantly lower susceptibility to light-induced degradation (LID), translating to higher annual energy yield over the full system lifetime. - **Bifacial Design — Additional Energy Yield** - The bifacial construction enables absorption of irradiance reflected from the mounting surface. With typical albedo values from a light-colored rooftop or reflective membrane, rear-side energy gain reaches 5–15% relative to an equivalent monofacial module, reducing the effective LCOE of the installation. - **30-Year Linear Power Warranty** - BYD guarantees linear power degradation for 30 years (per ENF Solar data and BYD's official website). None of the compared peers (Powitt, Talesun, Tongwei) publicly disclose warranty terms beyond 25 years, making this series better protected from a capital-value standpoint and strengthening project bankability. - **BYD Tier-1 Bankable Manufacturer Since 1995** - BYD is listed as a Tier-1 bankable manufacturer by BNEF (Bloomberg NEF), a key requirement for securing commercial and residential project financing from banks and investment funds. None of the peer manufacturers (Powitt, Talesun, Tongwei) carry comparable brand recognition in Western markets. ## Cons - **Product Warranty Limited to 12 Years** - The product warranty stands at 12 years — the minimum acceptable threshold for the premium segment. Select manufacturers (e.g., REC Alpha, Panasonic HIT) offer 15–25-year product warranties. Within BYD's own lineup, the HALO HJT series (HSBK) carries a 15-year product warranty, placing the NLBK-36 at a disadvantage within the same manufacturer's portfolio. - **Industry-Wide TOPCon Reliability Concerns (2025)** - Studies by Fraunhofer ISE, NREL, and Progress in Photovoltaics (2025) have identified critical UV-induced degradation (UVID) and moisture-related degradation in TOPCon modules — accelerated aging tests recorded losses of up to -12% after 120 kWh/m², with a bill-of-materials (BOM) failure rate rising to 41% (PV-Tech, 2025). The issue is technology-wide (affecting the entire TOPCon sector, not BYD exclusively); nonetheless, buyers should require distributor confirmation of IEC 61215 certification under the current edition. ## About this series The BYD AURO N NLBK-36 panel series introduces a new quality to rooftop installations thanks to the use of **N-type cell technology**, which provides significantly higher resistance to light-induced degradation and better performance in low-light conditions. By choosing this solution, investors gain the certainty of stable energy yields for decades, which directly translates into a faster return on investment. This model stands out with its **Full Black aesthetics**, making the modules almost blend into the dark roof surface, which makes them an ideal choice for modern single-family housing. The use of advanced busbars and precise frame construction increases mechanical resistance to extreme weather conditions, such as strong winds or heavy snow loads. **Excellent temperature coefficient** allows for efficient operation even on hot summer days, when standard modules from other manufacturers lose power. BYD AURO N NLBK-36 is the answer to the needs of the most demanding users who are looking for a compromise between uncompromising power and an elegant appearance. Unlike market competitors, this series offers **longer product and performance warranties**, which constitutes solid capital protection for years. It is an ideal solution for energy-efficient homes and commercial projects aimed at maximizing self-consumption and aesthetic quality. ## Notable figures - Efficiency of 22.8% matches the \*\*TOPCon 550-600W\*\* median - 228.4 W/m² power density - 4.0 W/m² more than \*\*TOPCon 550-600W\*\* median (224.4 W/m²), more power per roof area - At -0.30%/°C, hot weather performance is typical for \*\*TOPCon 550-600W\*\* panels - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface - In the top 19% for efficiency among all TOPCon panels ## Questions ### What warranty is offered on the BYD AURO N NLBK-36 panels? The BYD AURO N NLBK-36 series comes with a 12-year product warranty covering material and workmanship defects, as well as a 30-year linear power output warranty. This means that after three decades, the module must still produce at least the manufacturer-specified percentage of its rated power. This is one of the longest warranties available in the premium panel segment and provides solid investment protection for any prosumer. ### How does the TOPCon technology in the BYD AURO N NLBK-36 differ from standard PERC cells? The TOPCon cells used in the NLBK-36 series feature an additional silicon oxide tunneling layer that reduces charge carrier recombination. In practice, this translates to higher module efficiency (up to 23.23%), improved performance under low-irradiance conditions (overcast skies, early mornings, late evenings), and a significantly lower LID degradation rate compared to conventional P-type PERC cells. For the end investor, this means more kWh generated annually from the same roof area. ### Is the BYD AURO N NLBK-36 a bifacial panel, and is it worth installing on a pitched roof? Yes, the NLBK-36 is a bifacial module with a bifaciality factor of up to 80%, meaning the rear side of the panel captures light reflected from the ground surface or roofing substrate. On pitched roofs with a light-colored underlayment, or in ground-mounted installations, the rear-side gain can add several percentage points of additional energy yield. The module performs well on both pitched and flat roofs — particularly where a white or light-colored roofing membrane has been installed. ### Does the Full Black design of the BYD AURO N NLBK-36 panels affect their efficiency in summer? The dark frame and black cells do absorb slightly more heat, which can in theory marginally raise the module's operating temperature. However, the NLBK-36 series benefits from the excellent temperature coefficient characteristic of N-type TOPCon cells, which minimizes power losses at elevated temperatures. In practice, the efficiency difference compared to the standard variant is negligible, and the aesthetic advantage — seamless integration with a dark-colored roof — is considered worthwhile by the majority of investors. ### What is the maximum power output of a single BYD AURO N NLBK-36 panel, and what size systems can be built with it? The top model in the series delivers a peak power output of 600 Wp. This means that only 17 panels are needed to build a 10 kWp system, which is a significant advantage when roof space is limited. A high per-module wattage also results in fewer electrical connections and lower balance-of-system (BoS) hardware costs. The NLBK-36 series is suitable for small residential installations as well as commercial projects in the range of several tens of kWp. ### Is BYD a reliable photovoltaic panel manufacturer, and does the AURO N NLBK-36 come from a Tier 1 supplier? BYD (Build Your Dreams) is a Chinese conglomerate classified as a Tier 1 manufacturer by BloombergNEF, meaning it holds an established market position, maintains its own financing, and has a long track record in production. The AURO N NLBK-36 series is manufactured in BYD's own factories under rigorous quality control standards. By sourcing panels from a Tier 1 manufacturer, investors minimize risk related to warranty service availability and supplier stability over the full 30-year lifespan of the installation. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/byd-nlbk-36-b147fe91bbb6.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, lighter, +2.0 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | +50 W, lighter, +2.0 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | Cooler, lighter, +1.8 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | +45 W, lighter, +1.8 pp | | [AIKO AIKO-A630-MAH72Dw](https://comparepv.com/panel/aiko-aiko-a630-mah72dw) | 630 W | +40 W, cooler, +1.6 pp | | [Longi Solar LR7-60HVHL-550M](https://comparepv.com/panel/longi-lr7-60hvhl-550m) | 550 W | -40 W, 16 kg lighter, +1.6 pp | | [BYD NLBK-24-380](https://comparepv.com/panel/byd-nlbk-24-380) | 380 W | -210 W, lighter, -8.1 pp | | [BYD NLBK-24-385](https://comparepv.com/panel/byd-nlbk-24-385) | 385 W | -205 W, lighter, -7.9 pp | | [BYD NLBK-24-390](https://comparepv.com/panel/byd-nlbk-24-390) | 390 W | -200 W, lighter, -7.7 pp | | [BYD NLBK-24-395](https://comparepv.com/panel/byd-nlbk-24-395) | 395 W | -195 W, lighter, -7.6 pp | | [BYD NLBK-24-400](https://comparepv.com/panel/byd-nlbk-24-400) | 400 W | -190 W, lighter, -7.4 pp | | [BYD MLTK-36 530W](https://comparepv.com/panel/byd-mltk-36-530w) | 530 W | -60 W, lighter, -2.3 pp | | [BYD MLTK-36 535W](https://comparepv.com/panel/byd-mltk-36-535w) | 535 W | -55 W, lighter, -2.1 pp | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +60 W, lighter, +2.4 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +55 W, lighter, +2.2 pp | --- Source: https://comparepv.com/panel/byd-nlbk-36-590-1 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.