--- title: "VSUN VSUN420N-108BMH-DG 420W Solar Panel - Specs & Review | ComparePV" description: "VSUN VSUN420N-108BMH-DG 420W solar panel. Specs: 21.55% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/vsun-vsun420n-108bmh-dg" updated: 2026-09-11 --- # VSUN VSUN420N-108BMH-DG Middle of its segment, heavy for its output 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** VSUN - **Model:** VSUN420N-108BMH-DG - **Series:** VSUN 108BMH-DG - **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 | 21.55% | 22.00% | Typical | 7,784 | | Power density | 215.1 | 220.2 | Weak - bottom 19% | 7,882 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight (kg) | 24.7 kg | 22.0 kg | Weak - bottom 7% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.55% | 22.00% | Typical | 7,784 | | Power density | 215.1 | 220.2 | Weak - bottom 19% | 7,882 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight per kWp | 58.8 | 51.4 | Weak - bottom 7% | 11,908 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **58.8 kg per kWp** - Bottom 7% of the TOPCon 400-450 W segment, against a median of 51.4. Ranked 11,908th in the whole database. - **215.1 watts per square metre** - Bottom 19% of the TOPCon 400-450 W segment, against a median of 220.2. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Weight-limited structures and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 420 W - **Efficiency:** 21.55 % - **Voltage at Pmax (Vmp):** 30.38 V - **Current at Pmax (Imp):** 13.82 A - **Open-circuit voltage (Voc):** 38.31 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:** -0.280 %/degC - **Temperature coefficient of Isc:** 0.040 %/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:** 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 | 7784 of 14005 | | Power density | 7882 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 11908 of 14005 | | Warranty | 21 of 14005 | ## About this series The VSUN 108BMH-DG series are modules designed for high energy production in real-world conditions, both on rooftops and in larger installations. A key advantage is the **bifacial technology**, which allows the panel to generate energy not only from the front, but also from reflected light from the ground. Combined with **N-type TOPCon cells**, this results in more stable performance in hot weather, lower losses over time, and better efficiency in low-light conditions. The use of a **108-cell half-cut configuration** improves resistance to partial shading and reduces the risk of losses due to uneven lighting - which is particularly important in Poland due to chimneys, skylights, or trees. The **dual-glass (glass-glass) construction** increases durability and resistance to environmental factors, while the robust design makes it easy to integrate into projects where long-term reliability is a priority. This is a good choice for investors who want to maximize the energy output from a given area and are looking for a technology that is clearly more advanced than standard PERC modules. ## Notable figures - At 21.6% efficiency, this panel is on par with typical \*\*TOPCon 400-450W\*\* modules - At 215.1 W/m², this panel generates 5.1 W/m² less per unit area than \*\*TOPCon 400-450W\*\* median (220.2 W/m²) - Temperature coefficient of -0.30%/°C matches the \*\*TOPCon 400-450W\*\* median - At 24.7 kg (2.7 kg above \*\*TOPCon 400-450W\*\* median of 22.0 kg), requires checking roof load capacity - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces ## Questions ### Is the VSUN 108BMH-DG series still available to buy? No, production of the VSUN 108BMH-DG series has ended and the model is being phased out of the manufacturer's lineup. Availability is now limited to remaining distributor stock, so it's worth confirming current inventory before placing larger orders. Buyers should also consider newer VSUN TOPCon models that have replaced the 108BMH-DG in the current catalog. ### What does bifacial technology actually add on the VSUN 108BMH-DG panel? Bifacial cells let the panel generate extra energy from its rear side using light reflected off the roof, ground, or a light-colored surface underneath. Depending on the ground albedo and mounting height, this can add several percent of extra annual yield compared to a monofacial module of the same power rating. The benefit is most noticeable on ground-mount and carport installations where the rear side has good access to reflected light. ### How do the N-type TOPCon cells in the VSUN 108BMH-DG differ from standard PERC cells? TOPCon cells add a tunnel oxide passivation layer that reduces electron recombination and boosts efficiency compared to conventional P-type PERC cells. In practice this means higher output from the same panel area, lower annual degradation, and better performance in high heat and low-light conditions. It's a newer-generation cell technology that manufacturers now treat as the natural successor to PERC. ### What warranty comes with the VSUN 108BMH-DG series and what does it cover? The manufacturer provides a 12-year product warranty covering material and workmanship defects, plus a 30-year linear power warranty guaranteeing at least 87.4 percent of rated output at the end of that period. This is a typical standard for newer-generation TOPCon modules, longer than older PERC series offered. Since the series is discontinued, it's worth confirming warranty servicing terms directly with the seller. ### Does the 108-cell half-cut layout on the VSUN 108BMH-DG handle partial shading well? Yes, splitting cells into half-cut halves limits how much shading on one section affects the whole string, since a shaded portion of the panel doesn't disable the entire module. This matters for typical rooftop obstacles like chimneys, antennas, or dormers where uneven light exposure through the day is common. The result is lower production losses compared to full-cell panels. ### Does the glass-glass construction on the VSUN 108BMH-DG hold up better against weather than a standard laminate? Yes, the dual-glass build replaces the rear polymer backsheet with tempered glass, improving resistance to moisture, PID, and microcracks, which typically extends the panel's real-world service life. This construction also tends to age more slowly under long-term UV exposure. The tradeoff is added weight, which should be factored into mounting structure choice, especially on older roofs. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/648924121169b-5-85213bb162f5.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, lighter, +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, +2.2 pp | | [Maxeon SPR-MAX7-470](https://comparepv.com/panel/maxeon-spr-max7-470) | 470 W | +50 W, +2.1 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, lighter, +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, hotter, -1.6 pp | | [VSUN VSUN395-108BMH-DG](https://comparepv.com/panel/vsun-vsun395-108bmh-dg) | 395 W | -25 W, hotter, -1.3 pp | | [VSUN VSUN400-108BMH-DG](https://comparepv.com/panel/vsun-vsun400-108bmh-dg) | 400 W | -20 W, hotter, -1.1 pp | | [VSUN VSUN405-108BMH-DG](https://comparepv.com/panel/vsun-vsun405-108bmh-dg) | 405 W | -15 W, hotter, -0.8 pp | | [VSUN VSUN410-108BMH](https://comparepv.com/panel/vsun-vsun410-108bmh) | 410 W | Hotter, lighter, -0.6 pp | | [VSUN VSUN415N-108MH](https://comparepv.com/panel/vsun-vsun415n-108mh) | 415 W | Lighter, -0.3 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +90 W, cooler, +3.4 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +75 W, cooler, +3.2 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +85 W, cooler, +3.1 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +70 W, cooler, +2.9 pp | --- Source: https://comparepv.com/panel/vsun-vsun420n-108bmh-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.