--- title: "BYD NLTK-27-445W 445W Solar Panel - Specs & Review | ComparePV" description: "BYD NLTK-27-445W 445W solar panel. Specs: 22.79% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/byd-nltk-27-445w" updated: 2026-09-11 --- # BYD NLTK-27-445W Space saver, short guarantee 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** BYD - **Model:** NLTK-27-445W - **Series:** NLTK-27 425-445W - **Rated power:** 445 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) | 445 W | 435 W | Strong - top 8% | | | Module efficiency | 22.79% | 22.00% | Strong - top 3% | 3,005 | | Power density | 227.9 | 220.2 | Strong - top 2% | 2,790 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight (kg) | 20.6 kg | 22.0 kg | Strong - top 7% | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 7% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.79% | 22.00% | Strong - top 3% | 3,005 | | Power density | 227.9 | 220.2 | Strong - top 2% | 2,790 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight per kWp | 46.3 | 51.4 | Strong - top 7% | 1,101 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 7% | 9,798 | ### Strengths - **227.9 watts per square metre** - Top 2% of the TOPCon 400-450 W segment, against a median of 220.2. Ranked 2,790th in the whole database. - **22.79% module efficiency** - Top 3% of the TOPCon 400-450 W segment, against a median of 22.00%. Ranked 3,005th in the whole database. - **46.3 kg per kWp** - Top 7% of the TOPCon 400-450 W segment, against a median of 51.4. Ranked 1,101st in the whole database. ### 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, commercial and shaded-installations. - **Not ideal for:** Owners who want a long output guarantee. ## Specification ### Electrical - **Rated power (Pmax):** 445 W - **Efficiency:** 22.79 % - **Voltage at Pmax (Vmp):** 33.02 V - **Current at Pmax (Imp):** 13.48 A - **Open-circuit voltage (Voc):** 39.59 V - **Short-circuit current (Isc):** 13.93 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 ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 20.6 kg - **Area:** 1.95 m2 - **Power density:** 227.9 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 85.8 % - **Annual degradation:** 0.55 % - **Output after 30 years:** 370 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 3005 of 14005 | | Power density | 2790 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 1101 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Highest Efficiency in the Peer Group** - The peak efficiency of 22.79% (445W variant) outperforms all identified peer comparables: Q-Cells Q.TRON BLACK (22.3%), Solitek SOLRIF D Satin (22.06%), and SunEvo SE6-46SC (21.4%). Even the lower end of the series (21.76% for the 425W variant) exceeds the SunEvo by 0.36 percentage points, translating directly into higher energy yield per m² of roof area. - **N-type TOPCon – Low Temperature Coefficient** - The N-type TOPCon cells of the NLTK-27 series achieve a temperature coefficient of approximately -0.30%/°C, versus the typical -0.34% to -0.37%/°C of older P-type PERC modules. Under Polish summer conditions (cell temperature ~60–70°C), this results in a realistically 1.5–2% higher energy yield compared to PERC modules. An additional benefit is the elimination of LID (Light-Induced Degradation), a phenomenon characteristic of P-type silicon. - **Bifacial Design** - The rear surface of the module is capable of absorbing light reflected from the ground (albedo), which in ground-mounted installations on light-colored gravel or white roofing membranes delivers an additional 5–15% energy yield compared to a monofacial equivalent (per manufacturer data and independent PVEL testing). This makes the series particularly well-suited for ground-mount and flat-roof installations. - **BNEF Tier-1 Manufacturer with Large-Scale Production** - BYD is listed among BNEF Tier-1 bankable manufacturers (Q1 2026), confirming its ability to secure project financing from independent commercial banks and significantly reducing credit risk for institutional investors. The company has been in operation since 1995 and is one of the world's largest cell manufacturers, minimizing the risk of warranty loss due to manufacturer insolvency over a 25-year horizon. - **Low Annual Degradation and 25-Year Power Warranty** - BYD specifies an annual degradation rate below 0.5% for its N-type line (after the first year), which under the 25-year power warranty translates to retention of more than 87% of nominal power at the end of the warranty period. This simplifies financial modeling and reduces the risk of discrepancy between projected and actual long-term energy yield. ## Cons - **Efficiency Spread Within the Series – 1.03 Percentage Points** - The gap between the 425W variant (21.76%) and the 445W variant (22.79%) exceeds one percentage point. A buyer ordering modules without precisely specifying the variant may receive units whose efficiency is close to that of the SunEvo SE6-46SC (21.4%) rather than the expected premium tier. When designing an installation, it is essential to specify the exact variant and verify the power class actually delivered. - **12-Year Product Warranty – Below Market Premium** - The 12-year product warranty (materials and workmanship) represents the industry standard; however, select European manufacturers and BYD's own higher-tier AURO N series offer 15–25 years of product warranty coverage. In the context of commercial installations subject to project finance requirements, this may present a limitation during due diligence. ## About this series The BYD NLTK-27 425-445W series are modules based on **N-type TOPCon cells**, designed for high energy production under real operating conditions - even when the roof or ground-mounted structure does not provide ideal exposure throughout the day. The technology used helps to minimize losses due to temperature and supports more stable yields during transitional seasons, which translates into more predictable self-consumption and faster payback of the project. In practice, they stand out due to their **bifacial design**, which can utilize reflected light from the ground - particularly valuable on bright roofs, membranes, gravel, or in ground-mounted installations. For investors, **low degradation over time** is also important, as it makes it easier to plan yields over a longer period and reduces the risk of discrepancy between forecasts and reality. They are a good choice for homes, businesses, and PV farms where **high surface efficiency**, reliability, and compatibility with modern inverters and optimizers are key. Thanks to their **robust construction and the sealing class of the mounting box**, the modules also perform well in demanding weather conditions. ## Notable figures - Efficiency of 22.8% is 0.8pp above the \*\*TOPCon 400-450W\*\* median (22.0%) - Power density of 227.9 W/m² packs 7.7 W/m² more into the same footprint vs \*\*TOPCon 400-450W\*\* median (220.2 W/m²) - Temperature coefficient of -0.30%/°C matches the \*\*TOPCon 400-450W\*\* median - At 20.6 kg, this panel is 1.4 kg lighter than \*\*TOPCon 400-450W\*\* median (22.0 kg) - easier handling during installation - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface ## Questions ### What warranty applies to the BYD NLTK-27 425–445W panels? The BYD NLTK-27 425–445W series comes with a 12-year product warranty from the manufacturer and a 25-year linear power output warranty. This means BYD commits to maintaining a defined performance level for the modules over a quarter of a century. It is one of the stronger warranty standards in the N-type TOPCon panel segment for both residential prosumer and commercial installations. ### What is TOPCon technology in the BYD NLTK-27 panels, and is it worth the premium? TOPCon is an N-type cell technology featuring an additional tunnel oxide passivation layer that suppresses charge carrier recombination. In practice, this translates to a module efficiency of up to 22.79% and a temperature coefficient of Pmax of approximately −0.30%/°C, meaning lower power losses on hot days compared to older PERC cells. Over a 25-year system lifetime, the difference in energy yield is real and measurable. ### Does the bifacial design of the BYD NLTK-27 panels make a difference on a typical pitched roof? The bifacial construction allows BYD NLTK-27 modules to capture light reflected from the rear side, which delivers noticeable gains on pitched roofs with light-colored surfaces, TPO membranes, or white gravel ballast. On dark roof tiles the gain will be more modest, but bifacial technology fully demonstrates its potential in ground-mounted systems and flat-roof installations with an appropriately reflective substrate. ### Are the BYD NLTK-27 445W panels compatible with popular inverters available in Poland? Yes, the NLTK-27 series is designed to work with inverters from the leading brands present on the Polish market, including Fronius, SMA, SolarEdge, Sungrow, GoodWe, and Deye. The module's electrical parameters fall within the standard voltage and current ranges supported by modern string and hybrid inverters. It is nonetheless advisable to confirm the system design with a qualified installer, especially when power optimizers are part of the configuration. ### How do the BYD NLTK-27 panels perform in winter and under low-irradiance conditions? N-type TOPCon cells exhibit a better response to diffuse irradiance than older P-type technologies, resulting in higher energy yields on overcast days and during transitional seasons. In addition, the low temperature coefficient means that cold, sunny winter days can be surprisingly productive. This is a significant advantage in the Polish climate, where the number of peak sun hours is inherently limited. ### Is BYD a reliable solar panel manufacturer? BYD is classified as a Tier 1 manufacturer by BloombergNEF, which denotes the highest level of financial creditworthiness and supply chain stability. The company is one of the world's largest producers of photovoltaic cells and modules, and its long-standing presence on the global market ensures the availability of warranty service support. For investors planning installations with a 20–25 year horizon, the financial stability of the manufacturer is of critical importance. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/byd-nltk-27-6c73a0ad8e4a.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +50 W, +2.0 pp, +5 yr warranty | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +45 W, +1.7 pp, +5 yr warranty | | [Suntech STP-NT11/48QGSF-490](https://comparepv.com/panel/suntech-stp-nt11-48qgsf-490) | 490 W | +45 W, +1.7 pp, +5 yr warranty | | [JA Solar JAT54S40-485/LR](https://comparepv.com/panel/ja-solar-jat54s40-485-lr) | 485 W | +40 W, +1.5 pp, +5 yr warranty | | [AIKO AIKO-A485-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a485-mce54mw) | 485 W | +40 W, +1.5 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-495M](https://comparepv.com/panel/longi-lr7-54hjd-495m) | 495 W | +50 W, cooler, +1.5 pp | | [AIKO AIKO-A485-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a485-mah54mw) | 485 W | +40 W, +1.5 pp, +5 yr warranty | | [BYD NLK-27-425W](https://comparepv.com/panel/byd-nlk-27-425w) | 425 W | -20 W, -1.0 pp | | [BYD NLBK-27-430](https://comparepv.com/panel/byd-nlbk-27-430) | 430 W | Heavier, -0.8 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 | +65 W, cooler, +2.2 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +60 W, cooler, +1.9 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +55 W, cooler, +1.7 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +55 W, +1.7 pp, +5 yr warranty | --- Source: https://comparepv.com/panel/byd-nltk-27-445w 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.