--- title: "VSUN VSUN425N-108BMH-DG-BB 425W Solar Panel - Specs & Review | ComparePV" description: "VSUN VSUN425N-108BMH-DG-BB 425W solar panel. Specs: 21.76% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/vsun-vsun425n-108bmh-dg-bb" updated: 2026-09-11 --- # VSUN VSUN425N-108BMH-DG-BB Middle of its segment, heavy for its output 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** VSUN - **Model:** VSUN425N-108BMH-DG-BB - **Series:** VSUN N-108BMH-DG-BB - **Rated power:** 425 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) | 425 W | 435 W | Typical | | | Module efficiency | 21.76% | 22.00% | Typical | 7,285 | | Power density | 217.6 | 220.2 | Typical | 7,172 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight (kg) | 24.7 kg | 22.0 kg | Weak - bottom 8% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.76% | 22.00% | Typical | 7,285 | | Power density | 217.6 | 220.2 | Typical | 7,172 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight per kWp | 58.1 | 51.4 | Weak - bottom 8% | 11,567 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **58.1 kg per kWp** - Bottom 8% of the TOPCon 400-450 W segment, against a median of 51.4. Ranked 11,567th in the whole database. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 425 W - **Efficiency:** 21.76 % - **Voltage at Pmax (Vmp):** 31.72 V - **Current at Pmax (Imp):** 13.40 A - **Open-circuit voltage (Voc):** 38.40 V - **Short-circuit current (Isc):** 14.16 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:** 24.7 kg - **Area:** 1.95 m2 - **Power density:** 217.6 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 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:** 371 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 7285 of 14005 | | Power density | 7172 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 11567 of 14005 | | Warranty | 21 of 14005 | ## About this series The VSUN N-108BMH-DG-BB module series is an advanced solution based on innovative **N-type TOPCon** cells that redefine performance standards in variable lighting conditions. Thanks to the use of **Bifacial Dual Glass** construction, these panels effectively absorb reflected light hitting the rear side, significantly increasing the total annual energy yield. Choosing this series effectively solves the problem of limited roof space by offering higher power density and excellent resistance to light- and temperature-induced degradation. The aesthetic **Black Frame** finish makes the installation look modern, perfectly blending with dark roof coverings. The robust glass-glass construction ensures exceptional mechanical durability and resistance to aggressive weather factors, as confirmed by a **30-year performance warranty**. This product is dedicated to demanding private investors and companies that focus on maximizing profits and system longevity. What sets them apart from the competition is significantly better performance in diffused light and a minimal annual power drop, which guarantees energy stability for decades. These panels are the optimal choice wherever the highest reliability must go hand-in-hand with elegance and the latest photovoltaic technology. ## Notable figures - Efficiency of 21.8% matches the \*\*TOPCon 400-450W\*\* median - At 217.6 W/m² power density, roof space requirements are typical for \*\*TOPCon 400-450W\*\* panels - Temperature coefficient of -0.30%/°C matches the \*\*TOPCon 400-450W\*\* median - Weight of 24.7 kg is 2.7 kg above \*\*TOPCon 400-450W\*\* median (22.0 kg) - verify structural support - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface ## Questions ### What warranty comes with the VSUN N-108BMH-DG-BB solar panels? The VSUN N-108BMH-DG-BB series is backed by a 25-year product warranty and a 30-year linear power performance warranty. This means the manufacturer commits to repairing or replacing modules with manufacturing defects for 25 years, while guaranteeing a defined minimum percentage of rated power output over 30 years, ensuring stable energy yield throughout the system's lifetime. ### What is N-type TOPCon technology and how does it differ from the common PERC cells? TOPCon (Tunnel Oxide Passivated Contact) is a newer generation of N-type silicon cells that, compared to P-type PERC cells, offer higher efficiency, lower light-induced degradation (LID), and better performance at high temperatures and low-light conditions. As a result, VSUN N-108BMH-DG-BB panels deliver more consistent energy output year-round, especially during periods of lower irradiance. ### Do the bifacial VSUN N-108BMH-DG-BB panels actually produce more energy? Yes, the Bifacial Dual Glass construction allows the rear side of the panel to capture light reflected from the roof, wall, or ground surface. In practice, this delivers an additional energy gain ranging from a few percent up to double digits compared to monofacial panels, though the actual effect depends on mounting height, ground albedo, and installation tilt angle. ### How much power does a single VSUN N-108BMH-DG-BB panel generate? A panel from the VSUN N-108BMH-DG-BB series reaches a maximum power output of up to 430 Wp under standard test conditions (STC). This is a competitive figure for 108 half-cut cell TOPCon modules, enabling high power density on limited roof space, which matters most for installations with restricted mounting area. ### Is VSUN a Tier 1 manufacturer, and does that matter when choosing solar panels? VSUN does not currently appear on the Bloomberg NEF Tier 1 manufacturer list, a classification primarily tied to bank financing scale rather than product quality itself. The panels pass standard certifications (IEC, TÜV) and carry long-term warranties, so it's worth evaluating them on technical parameters and warranty terms individually rather than relying solely on Tier 1 status. ### Does the Dual Glass construction of the VSUN N-108BMH-DG-BB require special mounting on a sloped roof? No, dual-glass panels are installed on standard mounting structures used for sloped roofs, similar to panels with a standard frame and backsheet. However, note the slightly higher weight of the module due to the double glass layer, and ensure adequate rear ventilation to fully benefit from the bifacial light absorption potential. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/661e0d695c348-3288fbee8056.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Maxeon SPR-MAX7-475](https://comparepv.com/panel/maxeon-spr-max7-475) | 475 W | +50 W, +2.2 pp, +10 yr warranty | | [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 | +40 W, lighter, +2.0 pp | | [JA Solar JAT54S40-475/LR](https://comparepv.com/panel/ja-solar-jat54s40-475-lr) | 475 W | +50 W, lighter, +2.0 pp | | [Tongwei TWMNH-48HW475](https://comparepv.com/panel/tongwei-solar-twmnh-48hw475) | 475 W | +50 W, cooler, +2.0 pp | | [Astronergy CHSM48RN(DG)/F-BH-475](https://comparepv.com/panel/astronergy-chint-new-energy-technology-co-ltd-chsm48rn-dg-f-bh-475) | 475 W | +50 W, cooler, +2.0 pp | | [AIKO AIKO-A475-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a475-mce54mw) | 475 W | +50 W, cooler, +2.0 pp | | [AIKO AIKO-A475-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a475-mah54mw) | 475 W | +50 W, cooler, +2.0 pp | | [VSUN VSUN390-108BMH-DG](https://comparepv.com/panel/vsun-vsun390-108bmh-dg) | 390 W | -35 W, hotter, -1.8 pp | | [VSUN VSUN395-108BMH-DG](https://comparepv.com/panel/vsun-vsun395-108bmh-dg) | 395 W | -30 W, hotter, -1.5 pp | | [VSUN VSUN400-108BMH-DG](https://comparepv.com/panel/vsun-vsun400-108bmh-dg) | 400 W | -25 W, hotter, -1.3 pp | | [VSUN VSUN405-108BMH-DG](https://comparepv.com/panel/vsun-vsun405-108bmh-dg) | 405 W | -20 W, hotter, -1.0 pp | | [VSUN VSUN410-108BMH](https://comparepv.com/panel/vsun-vsun410-108bmh) | 410 W | Hotter, lighter, -0.8 pp | | [VSUN VSUN415N-108MH](https://comparepv.com/panel/vsun-vsun415n-108mh) | 415 W | -10 W, lighter, -0.5 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +85 W, cooler, +3.2 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +70 W, cooler, +3.0 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +80 W, cooler, +2.9 pp | --- Source: https://comparepv.com/panel/vsun-vsun425n-108bmh-dg-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.