--- title: "VSUN VSUN420N-108BMH-BB 420W Solar Panel - Specs & Review | ComparePV" description: "VSUN VSUN420N-108BMH-BB 420W solar panel. Specs: 21.51% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/vsun-vsun420n-108bmh-bb" updated: 2026-09-11 --- # VSUN VSUN420N-108BMH-BB Middle of its segment, needs the roof space 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** VSUN - **Model:** VSUN420N-108BMH-BB - **Series:** VSUN N-108BMH-BB - **Rated power:** 420 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) | 420 W | 435 W | Weak - bottom 16% | | | Module efficiency | 21.51% | 22.00% | Weak - bottom 20% | 7,894 | | Power density | 215.1 | 220.2 | Weak - bottom 19% | 7,882 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight (kg) | 21.4 kg | 22.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.51% | 22.00% | Weak - bottom 20% | 7,894 | | Power density | 215.1 | 220.2 | Weak - bottom 19% | 7,882 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight per kWp | 51.0 | 51.4 | Typical | 4,321 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **215.1 watts per square metre** - Bottom 19% of the TOPCon 400-450 W segment, against a median of 220.2. - **21.51% module efficiency** - Bottom 20% of the TOPCon 400-450 W segment, against a median of 22.00%. - **Best for:** Residential, commercial, shaded-installations and hot-climate. - **Not ideal for:** Roofs where every square metre has to count and tight roof space. ## Specification ### Electrical - **Rated power (Pmax):** 420 W - **Efficiency:** 21.51 % - **Voltage at Pmax (Vmp):** 31.52 V - **Current at Pmax (Imp):** 13.32 A - **Open-circuit voltage (Voc):** 38.11 V - **Short-circuit current (Isc):** 14.07 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:** 108 - **Bifacial:** yes ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 21.4 kg - **Area:** 1.95 m2 - **Power density:** 215.1 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:** 367 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 7894 of 14005 | | Power density | 7882 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 4321 of 14005 | | Warranty | 21 of 14005 | ## About this series The VSUN N-108BMH-BB series consists of advanced modules based on **N-type TOPCon technology**, which currently represents the peak of efficiency in the photovoltaic industry. The use of N-type cells effectively eliminates the problem of light-induced degradation (LID), which translates into a significantly longer lifespan and stable energy production for decades. Thanks to the **Half-Cut design**, these panels perform excellently in partial shading conditions, minimizing power losses and protecting the system against the formation of hot-spots. A unique feature of this series is its aesthetics combined with high performance - the black frame and compact design make it an ideal choice for demanding users who care about the appearance of their roof. A **low temperature coefficient** guarantees that the installation maintains maximum efficiency even on hot summer days, which clearly distinguishes it from older P-type solutions. This product solves the problem of limited mounting space, offering high power density from every square meter of surface area. It is a solution dedicated to **modern prosumer installations** and commercial projects, where a fast return on investment and the reliability of Tier-1 class components are key. Investing in this series ensures the use of the latest achievements in materials engineering, providing excellent module performance in low sunlight conditions. ## Notable figures - Efficiency of 21.5% matches the \*\*TOPCon 400-450W\*\* median - Power density of 215.1 W/m² is 5.1 W/m² below \*\*TOPCon 400-450W\*\* median (220.2 W/m²) - needs more roof space - Temperature coefficient of -0.30%/°C matches the \*\*TOPCon 400-450W\*\* median - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces - In the top 56% for efficiency among all TOPCon panels ## Questions ### What is the difference between N-type TOPCon technology in the VSUN N-108BMH-BB and older P-type panels? N-type TOPCon cells used in the N-108BMH-BB series virtually eliminate light-induced degradation (LID), which causes P-type panels to lose power output in their first years of operation. As a result, the module maintains higher efficiency over its entire lifespan, with a much more linear and predictable power degradation curve than older P-type technologies. ### Are VSUN N-108BMH-BB panels bifacial, and how much extra energy does that produce? Yes, the N-108BMH-BB series uses bifacial construction, generating power from both the front and rear side of the module. The rear side captures light reflected from the ground, roof, or a bright surface, and under favorable mounting conditions (e.g., light-colored roof, elevated racking) can increase annual energy yield by up to several percent compared to a monofacial panel of the same rated power. ### What warranty does the VSUN N-108BMH-BB series come with? The manufacturer provides a 12-year product warranty covering material and workmanship defects, along with a 30-year linear power output warranty guaranteeing sustained high performance throughout the system's operational life. This warranty structure is typical for modern N-type modules and supports long-term investment planning compared to older PV technologies. ### Is the VSUN N-108BMH-BB suitable for small pitched roofs with limited space? Yes, with power output up to 430 Wp and a compact half-cut cell layout, the series delivers high power density per square meter, which matters on pitched roofs with limited surface area. The half-cut design also reduces losses from partial shading, such as from chimneys or antennas, a common issue on residential roofs with complex geometry. ### How does the VSUN N-108BMH-BB perform in high summer temperatures? Thanks to N-type TOPCon technology, the series has a low power temperature coefficient, meaning less efficiency loss as the module heats up on hot days compared to conventional P-type panels. In practice, this results in more stable energy production during summer, when panel surface temperatures can exceed 60°C and older technologies lose proportionally more power. ### Is VSUN a Tier-1 manufacturer, and is it reliable for a large investment? VSUN is not currently on the BloombergNEF Tier-1 list, but the company operates a European hub in Germany, and its modules go through standard quality certifications and industry-standard reliability testing. Tier-1 status mainly reflects a manufacturer's financial bankability rather than technical module quality, so purchasing decisions should be based on warranty terms and technical specifications rather than this classification alone. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/663b24984a851-699441c62a21.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Just Solar JST-EDMH-(445-465)W-TD (465W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-465w-class) | 465 W | +45 W, +2.3 pp | | [Luxor Solar LX-465M/182R-96+ GG](https://comparepv.com/panel/luxor-lx-465m-182r-96-gg) | 465 W | +45 W, cooler, +2.3 pp | | [Maxeon SPR-MAX7-470](https://comparepv.com/panel/maxeon-spr-max7-470) | 470 W | +50 W, +2.2 pp, +10 yr warranty | | [AIKO AIKO-A470-MAH54Mb](https://comparepv.com/panel/aiko-aiko-a470-mah54mb) | 470 W | +50 W, cooler, +2.1 pp | | [AIKO AIKO-A460-MAH54Mb](https://comparepv.com/panel/aiko-shenzhen-aiko-digital-energy-technology-co-ltd-aiko-a460-mah54mb-1) | 460 W | +40 W, cooler, +2.1 pp | | [TCL Zhonghuan HSM-BD54-LA470](https://comparepv.com/panel/tcl-zhonghuan-hsm-bd54-la470) | 470 W | +50 W, cooler, +2.1 pp | | [VSUN VSUN390-108BMH-DG](https://comparepv.com/panel/vsun-vsun390-108bmh-dg) | 390 W | -30 W, heavier, -1.5 pp | | [VSUN VSUN395-108BMH-DG](https://comparepv.com/panel/vsun-vsun395-108bmh-dg) | 395 W | -25 W, heavier, -1.3 pp | | [VSUN VSUN400-108BMH-DG](https://comparepv.com/panel/vsun-vsun400-108bmh-dg) | 400 W | Hotter, heavier, -1.0 pp | | [VSUN VSUN405-108BMH-DG](https://comparepv.com/panel/vsun-vsun405-108bmh-dg) | 405 W | Hotter, heavier, -0.8 pp | | [VSUN VSUN410-108BMH](https://comparepv.com/panel/vsun-vsun410-108bmh) | 410 W | -10 W, hotter, -0.5 pp | | [VSUN VSUN415N-108MH](https://comparepv.com/panel/vsun-vsun415n-108mh) | 415 W | -0.3 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +90 W, cooler, +3.5 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +75 W, cooler, +3.3 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +85 W, cooler, +3.2 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +70 W, cooler, +3.0 pp | --- Source: https://comparepv.com/panel/vsun-vsun420n-108bmh-bb 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.