--- title: "BYD NLBK-39 650 650W Solar Panel - Specs & Review | ComparePV" description: "BYD NLBK-39 650 650W solar panel. Specs: 23.25% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/byd-nlbk-39-650" updated: 2026-09-11 --- # BYD NLBK-39 650 Solid all-round for its segment 249 panels in the segment TOPCon 650-700 W ## Identity - **Manufacturer:** BYD - **Model:** NLBK-39 650 - **Series:** AURON NLBK-39 (625-650W) - **Rated power:** 650 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 650-700 W (249 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 650 W | 665 W | Weak - bottom 13% | | | Module efficiency | 23.25% | 22.40% | Typical | 1,239 | | Power density | 232.5 | 223.7 | Typical | 1,222 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight (kg) | 34.0 kg | 34.6 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.25% | 22.40% | Typical | 1,239 | | Power density | 232.5 | 223.7 | Typical | 1,222 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight per kWp | 52.3 | 53.2 | Typical | 5,769 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Commercial, utility-scale and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 650 W - **Efficiency:** 23.25 % - **Voltage at Pmax (Vmp):** 46.51 V - **Current at Pmax (Imp):** 13.98 A - **Open-circuit voltage (Voc):** 55.49 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:** 156 - **Bifacial:** yes ### Physical - **Length:** 2465 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 34.0 kg - **Area:** 2.80 m2 - **Power density:** 232.5 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 568 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 1239 of 14005 | | Power density | 1222 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 5769 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Zero LID and Low Annual Degradation** - N-type TOPCon cells exhibit zero light-induced degradation (LID), and annual power loss from year 2 onward is ≤0.55% — BYD guarantees retention of more than 84.8% of rated power after 25 years. By comparison, typical P-type PERC modules degrade at 0.55–0.70%/year while also suffering LID of 1–2% in the first year. - **30-Year Linear Power Warranty** - The manufacturer offers a 30-year linear power warranty, 5 years longer than the standard 25-year warranties offered by most Tier-1 manufacturers in the 625–650 W class. The product warranty stands at 12 years, which is typical for the premium segment. - **Favorable Temperature Coefficient** - The temperature coefficient of Pmax is -0.30%/°C, a clear improvement over the -0.34–0.35%/°C of P-type PERC modules. At a cell temperature of 65°C — a typical summer day in Poland — this difference translates to approximately 1.5–2% higher energy yield compared to older technology. - **Bifacial Design — Additional Yield from the Rear Side** - The bifacial construction enables 5–30% additional energy harvest from the module's rear surface, depending on ground albedo (gravel, light-colored concrete, snow). This is especially advantageous in ground-mounted systems and flat-roof installations with light-colored membranes, where albedo exceeds 0.2. - **BYD — Bankable Tier-1 Manufacturer** - BYD is listed among BNEF's Tier-1 bankable manufacturers, which significantly facilitates financing for commercial projects and utility-scale PV plants and reinforces confidence in the long-term warranty. The company has been in operation since 1995 and maintains a strong financial position as a global leader in batteries and EVs. ## Cons - **Lower Efficiency Than Jinko Tiger Neo** - The maximum module efficiency of the NLBK-39 is 23.25%, while direct competitor Jinko Solar Tiger Neo 66HL4M-BDX achieves 24.06% (+0.81 pp) in the same 650 W power class. On a 20-module installation, this difference amounts to approximately 100–130 Wp less total capacity for the same roof area. ## About this series The BYD AURON NLBK-39 (625-650W) series is designed to maximize energy yield from the same roof or ground area, especially in situations where every square meter counts. These modules are based on **N-type TOPCon** cells, which are known for their stable performance over long periods and excellent initial degradation resistance - ensuring that the installation maintains high productivity for longer. In practice, you gain more energy not only in full sunlight. **High efficiency in low-light conditions** allows for effective operation in typical Polish weather - under cloudy skies, fog, and during transitional periods. Furthermore, the use of **SMBB (multi-busbar architecture)** reduces losses and improves power generation, which is also beneficial in partially shaded conditions. This series also features a **bifacial** design, making it suitable for ground-mounted installations, bright roofs, and anywhere where the ground reflects light. The series targets investors who want to reduce energy costs over time, rather than just achieve a good result during installation. ## Notable figures - 23.2% module efficiency - 0.9pp better than the \*\*TOPCon 650-700W\*\* median of 22.4% - At 232.5 W/m² power density, this panel generates 8.8 W/m² more per unit area than \*\*TOPCon 650-700W\*\* median (223.7 W/m²) - At -0.30%/°C, hot weather performance is typical for \*\*TOPCon 650-700W\*\* panels - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof - #1239 for efficiency, #6093 for temperature performance out of 14005 panels ## Questions ### What is the efficiency of the BYD AURON NLBK-39 panels, and is it a competitive result? The BYD AURON NLBK-39 series achieves a module efficiency of 23.25%, placing it among the top-performing panels available for both residential prosumer and commercial installations. This high efficiency means that more energy is harvested per square meter of roof or ground space compared to older technologies such as PERC. N-type TOPCon cell technology is the primary driver behind this result. ### Do the BYD AURON NLBK-39 650W panels perform well under overcast skies and in Polish winter conditions? Yes. N-type TOPCon cells exhibit superior temperature resistance and excellent low-irradiance performance compared to PERC technology. For the NLBK-39 series, the power temperature coefficient is only -0.30%/°C, which limits output losses on hot days. Under typical Polish conditions — including cloud cover, fog, and short winter days — these modules operate more efficiently than previous-generation panels. ### What warranty does BYD provide for the AURON NLBK-39 series? BYD offers a 12-year product warranty covering material and workmanship defects, along with a 30-year linear power output warranty. This means the manufacturer guarantees that power output will remain above a defined threshold for three decades — one of the most extensive warranty commitments available on the market. An additional advantage is the characteristically low initial degradation of N-type TOPCon cells. ### Is the BYD AURON NLBK-39 series suitable for ground-mounted installations, and what benefit does its bifaciality provide? Yes, the NLBK-39 series is a bifacial module featuring glass on both sides, making ground-mounted installations its natural operating environment. The rear side of the panel captures light reflected from the ground surface — such as light gravel, a bright membrane, or snow — generating an additional 5–32% of energy relative to the front side alone. The brighter and more reflective the ground albedo, the greater the real-world energy gain. ### Is BYD a reliable panel manufacturer, and does the AURON NLBK-39 series come from an established supplier? BYD (Build Your Dreams) is a Chinese conglomerate ranked as a Tier 1 manufacturer according to industry benchmarks, indicating financial stability and verified production capacity. The company is one of the world's largest producers of PV cells and modules, and its products hold IEC and MCS certifications. The AURON NLBK-39 series is an active, non-discontinued product line within the manufacturer's current portfolio. ### What is SMBB in the BYD AURON NLBK-39 panels, and why does it matter for partial shading performance? SMBB (Super Multi Busbar) is a cell interconnection architecture that uses a very high number of thin busbars instead of a few wide ones. This shortens the electron path to the busbar, reduces internal resistance, and minimizes losses associated with microcracks. In practice, an SMBB module handles partial shading — from chimneys, skylights, or trees, for example — more effectively, maintaining higher output than panels built with conventional busbar architecture. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/nlbk-39-8224035bbd1b.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +1.9 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, lighter, +1.9 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, lighter, +1.8 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +1.8 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +50 W, cooler, +1.8 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +45 W, cooler, +1.6 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +1.6 pp | | [BYD NLBK-39 625](https://comparepv.com/panel/byd-nlbk-39-625) | 625 W | -25 W, -0.9 pp | | [BYD NLBK-39 630](https://comparepv.com/panel/byd-nlbk-39-630) | 630 W | -20 W, -0.7 pp | | [BYD NLBK-39 635](https://comparepv.com/panel/byd-nlbk-39-635) | 635 W | -15 W, -0.5 pp | | [BYD NLBK-39 640](https://comparepv.com/panel/byd-nlbk-39-640) | 640 W | -10 W, -0.4 pp | | [BYD NLBK-39 645](https://comparepv.com/panel/byd-nlbk-39-645) | 645 W | Very close match | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | Cooler, lighter, +1.6 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +20 W, cooler, +1.6 pp | --- Source: https://comparepv.com/panel/byd-nlbk-39-650 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.