--- 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-39-650-1" 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:** AURO N NLBK-39 - **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 hot-climate. ## 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 - **Bifacial gain:** 32.00 ### 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 % - **First-year degradation:** 1.00 % - **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 - **Up to 23.25% Efficiency – Segment Leader** - The 650 W variant achieves a module efficiency of 23.25%, placing it on par with the Einnova Solarline TOPCon 650 W (23.25%) and only 0.05 percentage points below the Astronergy ASTRO N5 (23.3%). This is significantly above mainstream P-type PERC modules (≈20–21%), translating into higher power density per m² and a more favorable LCOE on space-constrained rooftops. - **Temperature Coefficient of –0.30%/°C** - A Pmax(T) value of –0.30%/°C ranks among the best in the TOPCon class and clearly outperforms typical PERC modules (–0.35%/°C). At a cell temperature of 70°C — common during Polish summers with flush roof mounting — power loss is approximately 13.5% versus ~15.75% for PERC, a difference that is genuinely noticeable in daily energy yield during July and August. - **Bifaciality >80% – Meaningful Energy Gain** - A bifaciality factor above 80% means that, at a ground albedo of 20–25% (light-colored membrane or gravel), a ground-mounted installation can harvest 8–12% additional energy per year. For a 1 MWp plant at 1,100 kWh/kWp/year, this amounts to as much as 80–120 MWh of extra generation annually without increasing the footprint. - **30-Year Linear Power Warranty** - BYD guarantees a linear power degradation down to at least 87.4% of rated output after 30 years — a premium-class benchmark (by comparison, some Tier-2 manufacturers warrant only 80% after 25 years). As a BNEF Tier-1 manufacturer with operations dating back to 1995, BYD provides a credible basis for enforcing this warranty throughout its full term. - **Zero LID Thanks to N-Type Technology** - N-type TOPCon technology eliminates light-induced degradation (LID), which is inherent to boron-doped P-type cells. In practice, the module delivers output close to its nameplate rating from the first year of operation, with none of the 1–2% power drop observed in PERC modules — a factor that is particularly relevant for warranty calculations and PV performance audits. ## Cons - **Lower Efficiency Than the Jinko Tiger Neo** - The direct competitor — the Jinko Solar Tiger Neo 66HL4M-BDX 650 W — achieves an efficiency of 24.06% versus 23.25% for the BYD NLBK-39, a gap of 0.81 percentage points. With an identical module footprint, the Jinko unit generates approximately 3.5% more power per panel, a difference that translates into a measurable gap in annual yield at utility scale (e.g., a 5 MWp plant). - **12-Year Product Warranty** - Competitors such as Jinko Solar (Tiger Neo) and JA Solar (DeepBlue 4.0) routinely offer 15-year product warranties on select series. BYD's shorter 12-year coverage can become a point of negotiation in commercial project tenders and may be scrutinized during risk assessments by insurers and lenders. ## About this series The BYD AURO N NLBK-39 series features advanced photovoltaic modules utilizing **N-type TOPCon cell technology**, which sets new standards for conversion efficiency reaching up to 23.25%. Thanks to the use of N-type doping, these panels are completely resistant to light-induced degradation (LID), guaranteeing users stable energy production for decades. Their unique feature is an **exceptional bifaciality factor** exceeding 80%, which, under appropriate mounting conditions, allows for additional energy yield from radiation reflected off the ground. The NLBK-39 model effectively addresses performance drops in difficult weather conditions, offering **excellent yields under low irradiance**, which is crucial in the Polish climate during cloudy days and autumn-winter periods. Furthermore, a **low temperature coefficient of power** ensures the installation maintains high efficiency even during summer heatwaves, outperforming traditional older-generation modules in this regard. This solution is primarily dedicated to large commercial systems and modern solar farms, where the lowest levelized cost of energy (LCOE) and maximized power density are key. Robust construction and a 30-year linear power warranty confirm the highest manufacturing quality, distinguishing this product from mass-market budget solutions available on the market. Choosing this series is a sound investment in the durability and maximum energy efficiency of any facility. ## Notable figures - Efficiency of 23.2% is 0.9pp above the \*\*TOPCon 650-700W\*\* median (22.4%) - Power density of 232.5 W/m² packs 8.8 W/m² more into the same footprint vs \*\*TOPCon 650-700W\*\* median (223.7 W/m²) - At -0.30%/°C, hot weather performance is typical for \*\*TOPCon 650-700W\*\* panels - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces - #1239 for efficiency, #6093 for temperature performance out of 14005 panels ## Questions ### What is the TOPCon technology used in BYD AURO N NLBK-39 panels and why should you choose it? TOPCon (Tunnel Oxide Passivated Contact) is an N-type silicon cell technology that eliminates Light-Induced Degradation (LID). In practice, this means that BYD AURO N NLBK-39 panels maintain their rated efficiency of up to 23.25% from day one of operation, rather than losing several percent of power output as older P-type cells do. For the investor, this translates into genuinely higher energy production throughout the entire service life of the system. ### What warranty applies to the BYD AURO N NLBK-39 series? The manufacturer offers a 12-year product warranty covering material and workmanship defects, along with a 30-year linear power output warranty. The latter guarantees that over three decades the panel will deliver its rated power in a gradual, predictable manner — rather than expiring after 10–15 years as budget alternatives often do. Such an extended warranty horizon is made possible by the inherent durability of N-type cells and the dual-glass construction of the module. ### Do the bifacial BYD AURO N NLBK-39 panels deliver a real energy gain under Polish conditions? Yes, provided the system is correctly installed. The bifaciality factor of the NLBK-39 series exceeds 80%, which — when a light-colored surface such as gravel or a white geomembrane is used, or when ground-mounted with sufficient clearance — can increase energy yield by 5–15%. In Poland, this effect is most pronounced during summer months and on days when snow on the ground reflects irradiance onto the rear side of the module. ### How do BYD AURO N NLBK-39 panels perform during heat waves, and does high temperature affect their power output? The NLBK-39 series features a low temperature coefficient of power of -0.30%/°C. This means that for every degree above 25°C, the panel loses only 0.30% of its rated power. Conventional P-type modules typically lose 0.35–0.40%/°C. At a cell temperature of 65°C, the difference already amounts to several percent of actual output — which during Polish heat waves in July and August translates into noticeably higher daily energy yields. ### Is the 650 W BYD AURO N NLBK-39 series suitable for installation on a private home? The NLBK-39 series, with a peak power of 650 W and large physical dimensions, is designed primarily for commercial solar farms and large-scale industrial installations, where minimizing the levelized cost of energy (LCOE) and maximizing power density are the key objectives. For a typical single-family home, smaller modules in the 400–450 W range are a better fit, as they are easier to accommodate on a roof section and are compatible with standard residential inverters. ### Is BYD a reliable solar panel manufacturer, and where does the AURO N NLBK-39 series come from? BYD (Build Your Dreams) is a Chinese corporation headquartered in Shenzhen and classified as a Tier 1 manufacturer by the independent agency Bloomberg NEF, confirming its financial stability and ability to honor warranties for decades. The company is a global leader in both photovoltaic cell and module production as well as battery manufacturing. Tier 1 status is particularly important when selecting modules backed by a 30-year power output warranty, as it minimizes the risk that the manufacturer will no longer exist at the time of a potential warranty claim. ## 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-39-650-1 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.