--- title: "VSUN VSUN635N-156BMH-DG 635W Solar Panel - Specs & Review | ComparePV" description: "VSUN VSUN635N-156BMH-DG 635W solar panel. Specs: 22.72% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/vsun-vsun635n-156bmh-dg" updated: 2026-09-11 --- # VSUN VSUN635N-156BMH-DG Middle of its segment, heavy for its output 1,086 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** VSUN - **Model:** VSUN635N-156BMH-DG - **Series:** VSUN N-156BMH-DG - **Rated power:** 635 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 600-650 W (1086 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 635 W | 620 W | Strong - top 16% | | | Module efficiency | 22.72% | 22.80% | Typical | 3,245 | | Power density | 227.2 | 227.7 | Typical | 3,252 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 19% | 6,093 | | Weight (kg) | 34.9 kg | 32.7 kg | Weak - bottom 17% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.72% | 22.80% | Typical | 3,245 | | Power density | 227.2 | 227.7 | Typical | 3,252 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 19% | 6,093 | | Weight per kWp | 55.0 | 53.1 | Weak - bottom 17% | 9,356 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **55.0 kg per kWp** - Bottom 17% of the TOPCon 600-650 W segment, against a median of 53.1. - **-0.300 %/°C temperature coefficient** - Bottom 19% of the TOPCon 600-650 W segment, against a median of -0.290. - **Best for:** Utility-scale, commercial and hot-climate. - **Not ideal for:** Weight-limited structures and hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 635 W - **Efficiency:** 22.72 % - **Voltage at Pmax (Vmp):** 46.39 V - **Current at Pmax (Imp):** 13.69 A - **Open-circuit voltage (Voc):** 56.00 V - **Short-circuit current (Isc):** 14.40 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.300 %/degC - **Temperature coefficient of Voc:** -0.260 %/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:** 35 mm - **Weight:** 34.9 kg - **Area:** 2.80 m2 - **Power density:** 227.2 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:** 555 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 3245 of 14005 | | Power density | 3252 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 9356 of 14005 | | Warranty | 21 of 14005 | ## About this series The VSUN N-156BMH-DG series is an advanced solution based on **N-type TOPCon cell technology**, which redefines efficiency standards in large commercial installations and photovoltaic farms. The use of this architecture allows for the effective elimination of the light-induced degradation problem, translating into stable energy production for decades. A key advantage is the **bifacial Double Glass design**, which enables the absorption of radiation reflected from the ground, significantly increasing the total energy yield compared to single-sided modules. Thanks to the use of large-area cells and precise interconnection, these panels optimize power density per square meter, which directly reduces the costs of mounting structures and cabling. A **low temperature coefficient** ensures that the modules maintain high efficiency even on hot days, solving the problem of power drops in full sun. This product is designed for investors seeking the lowest LCOE and maximum durability. A standout feature among competitors is its exceptional **resistance to extreme weather conditions** and high mechanical load capacity, guaranteeing investment security in the demanding Polish climate. ## Notable figures - At 22.7% efficiency, this panel is on par with typical \*\*TOPCon 600-650W\*\* modules - At 227.2 W/m² power density, roof space requirements are typical for \*\*TOPCon 600-650W\*\* panels - Temperature coefficient of -0.30%/°C matches the \*\*TOPCon 600-650W\*\* median - At 34.9 kg, this panel is 2.2 kg heavier than the \*\*TOPCon 600-650W\*\* median (32.7 kg) - more demanding for installation crews - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof ## Questions ### What is N-type TOPCon cell technology used in the VSUN N-156BMH-DG panels, and how does it differ from popular P-type PERC? TOPCon (Tunnel Oxide Passivated Contact) is the N-type cell technology used in the VSUN N-156BMH-DG series, delivering higher module efficiency (up to 22.72%) than older P-type PERC cells. An additional tunnel oxide layer reduces recombination losses and virtually eliminates light-induced degradation (LID), resulting in more stable energy output throughout the system's lifetime. ### How much extra energy do the bifacial VSUN N-156BMH-DG panels produce compared to standard monofacial modules? Thanks to the Double Glass design, VSUN N-156BMH-DG panels capture reflected light on the rear side of the cell. With a bifacial factor of around 80%, this can boost total energy yield by up to double-digit percentages, especially over high-albedo surfaces like gravel, white roofing, or snow. The actual gain depends on mounting height, ground albedo, and tilt angle. ### What warranty comes with VSUN N-156BMH-DG solar panels? The manufacturer backs the VSUN N-156BMH-DG series with a 12-year product warranty and a 30-year linear power output warranty, guaranteeing at least 87.4% of original power after 30 years. This is a standard benchmark for modern TOPCon panels, giving investors confidence in a stable return over a three-decade horizon. ### Are the 635 Wp VSUN N-156BMH-DG panels suitable for residential rooftops, or are they mainly built for large PV farms? Given their large footprint (2465×1134 mm) and weight of nearly 35 kg, VSUN N-156BMH-DG panels are primarily designed for commercial installations and utility-scale solar farms, where maximizing power density per square meter matters most. Installation on single-family home roofs is possible but requires a sturdy mounting structure and adequate installation equipment due to the module's size. ### How do VSUN N-156BMH-DG panels perform in high summer heat? VSUN N-156BMH-DG modules have a low power temperature coefficient of -0.3%/°C, lower than typical PERC cells (usually around -0.35 to -0.4%/°C). This means smaller power losses during heat waves, when panel temperature can exceed 60°C, translating into higher real-world energy production in summer compared to older cell technologies. ### Is VSUN a Tier 1 solar panel manufacturer, and is the brand worth choosing? VSUN does not currently appear on the BloombergNEF Tier 1 manufacturer list, but the company is headquartered in Germany and offers panels built on proven N-type TOPCon technology backed by a 30-year power warranty. Tier 1 status mainly reflects financial standing and production scale, not necessarily module quality, so it's worth checking certifications and warranty terms as well. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/65f3e12fc2d76-d8f2019bef77.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +2.5 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +45 W, lighter, +2.5 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +40 W, lighter, +2.3 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +2.3 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +2.1 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | Cooler, lighter, +2.1 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +2.1 pp | | [VSUN VSUN610N-156BMH-DG](https://comparepv.com/panel/vsun-vsun610n-156bmh-dg) | 610 W | -25 W, -0.9 pp | | [VSUN VSUN615N-156BMH-DG](https://comparepv.com/panel/vsun-vsun615n-156bmh-dg) | 615 W | -20 W, -0.7 pp | | [VSUN VSUN620N-156BMH-DG](https://comparepv.com/panel/vsun-vsun620n-156bmh-dg) | 620 W | -15 W, -0.5 pp | | [VSUN VSUN625N-156BMH-DG](https://comparepv.com/panel/vsun-vsun625n-156bmh-dg) | 625 W | -10 W, -0.4 pp | | [VSUN VSUN630N-156BMH-DG](https://comparepv.com/panel/vsun-vsun630n-156bmh-dg) | 630 W | Very close match | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +65 W, cooler, +2.3 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +60 W, cooler, +2.2 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +35 W, cooler, +2.1 pp | --- Source: https://comparepv.com/panel/vsun-vsun635n-156bmh-dg 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.