--- title: "VSUN VSUN405-108BMH-DG 405W Solar Panel - Specs & Review | ComparePV" description: "VSUN VSUN405-108BMH-DG 405W solar panel. Specs: 20.74% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/vsun-vsun405-108bmh-dg" updated: 2026-09-11 --- # VSUN VSUN405-108BMH-DG Strong in heat, heavy for its output 954 panels in the segment PERC 400-450 W ## Identity - **Manufacturer:** VSUN - **Model:** VSUN405-108BMH-DG - **Series:** VSUN405-108BMH-DG - **Rated power:** 405 W - **Cell technology:** PERC - **Bifacial:** yes ## How it compares Compared against segment PERC 400-450 W (954 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 405 W | 410 W | Typical | | | Module efficiency | 20.74% | 20.60% | Typical | 10,645 | | Power density | 207.4 | 206.2 | Typical | 10,626 | | Temperature coefficient | -0.320 | -0.350 | Strong - top 5% | 8,312 | | Weight (kg) | 24.7 kg | 22.0 kg | Weak - bottom 9% | | | Performance warranty | 30 yrs | 25 yrs | Strong - top 17% | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.74% | 20.60% | Typical | 10,645 | | Power density | 207.4 | 206.2 | Typical | 10,626 | | Temperature coefficient | -0.320 | -0.350 | Strong - top 5% | 8,312 | | Weight per kWp | 61.0 | 53.0 | Weak - bottom 9% | 12,568 | | Performance warranty | 30 yrs | 25 yrs | Strong - top 17% | 21 | ### Strengths - **-0.320 %/°C temperature coefficient** - Top 5% of the PERC 400-450 W segment, against a median of -0.350. Ranked 8,312th in the whole database. - **30 year performance warranty** - Top 17% of the PERC 400-450 W segment, against a median of 25 yrs. ### Watch out for - **61.0 kg per kWp** - Bottom 9% of the PERC 400-450 W segment, against a median of 53.0. Ranked 12,568th in the whole database. - **Best for:** Residential, commercial, shaded-installations and hot-climate. - **Not ideal for:** Weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 405 W - **Efficiency:** 20.74 % - **Voltage at Pmax (Vmp):** 31.36 V - **Current at Pmax (Imp):** 12.92 A - **Open-circuit voltage (Voc):** 37.36 V - **Short-circuit current (Isc):** 13.78 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.320 %/degC - **Temperature coefficient of Voc:** -0.270 %/degC - **Temperature coefficient of Isc:** 0.048 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 108 - **Bifacial:** yes - **Bifacial gain:** 30.00 ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 24.7 kg - **Area:** 1.95 m2 - **Power density:** 207.4 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **First-year degradation:** 2.00 % ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 10645 of 14005 | | Power density | 10626 of 14005 | | Temperature coefficient | 8312 of 14005 | | Weight | 12568 of 14005 | | Warranty | 21 of 14005 | ## About this series The VSUN405-108BMH-DG series is an advanced **Bifacial Double Glass** solution that redefines performance standards in harsh environmental conditions. The use of double tempered glass instead of a traditional backsheet not only eliminates the risk of micro-cracks but, above all, allows for **additional energy yield from the rear side of the module**, which is crucial when installed on highly reflective surfaces. The use of 108 monocrystalline cells in **Half-Cut and Multi-Busbar** technology significantly reduces internal resistive losses and clearly improves module performance in partial shading conditions. This design effectively solves the problem of light-induced degradation (LID) and ensures exceptional temperature stability, which directly translates to higher electricity production on hot days. This series is dedicated to investors focusing on maximum system longevity, making it ideal for both large solar farms and demanding prosumer installations. What distinguishes it from the competition is its **exceptional resistance to extreme external factors**, such as salt mist or ammonia, while maintaining an aesthetic appearance and optimal dimensions for easy roof mounting. By choosing this model, you are investing in technology that guarantees long-term profitability and minimization of operating costs. ## Notable figures - Efficiency of 20.7% matches the \*\*PERC 400-450W\*\* median - Power density of 207.4 W/m² matches the \*\*PERC 400-450W\*\* median - Temperature coefficient of -0.32%/°C vs median -0.35%/°C means ~1% less power loss at 65°C - At 24.7 kg (2.7 kg above \*\*PERC 400-450W\*\* median of 22.0 kg), requires checking roof load capacity - Bifaciality factor of 70% can add 4-10% extra yield with reflective mounting surface ## Questions ### How much extra energy do VSUN405-108BMH-DG bifacial panels generate? The double tempered glass construction lets the module capture light reflected off the surface beneath it. Depending on the ground albedo (light-colored roofing, gravel, snow), the additional energy yield can range from a few percent up to 20-25% compared to a standard monofacial panel. The biggest gains occur on ground-mount systems or light-colored flat roofs where reflected light freely reaches the rear cells. ### Are VSUN405-108BMH-DG panels suitable for a sloped residential roof? Yes, though due to the double-glass construction these panels are somewhat heavier than standard backsheet modules, so it's worth checking the roof's load capacity before installation. Half-Cut cell technology improves module performance under partial shading, such as from a chimney or antenna, a common issue on residential sloped roofs. ### What warranty comes with VSUN405-108BMH-DG panels? The manufacturer provides a 12-year product warranty and a 30-year linear power output warranty, guaranteeing the declared energy production level throughout that period. Since this series has been discontinued, buyers should confirm with the distributor that warranty service terms are still active and enforceable. ### Are VSUN405-108BMH-DG panels still available for purchase? No, production of this series has ended, replaced by newer TOPCon cell models with higher power output. VSUN405-108BMH-DG panels can still be found only in warehouse clearance stock through distributors while supplies last, so availability and pricing may vary by wholesaler. ### What do Half-Cut and Multi-Busbar technologies offer in the 108-cell VSUN405-108BMH-DG panel? Splitting the monocrystalline cells into halves (half-cut) reduces internal resistive losses and limits the impact of partial shading on total panel output. Combined with multi-busbar technology, which adds more current-carrying paths across the cell surface, the panel achieves higher efficiency (around 20.7%) and is less susceptible to power loss caused by microcracks. ### Is VSUN a Tier 1 manufacturer, and is it trustworthy for a large-scale installation? VSUN is not currently listed as a Tier 1 manufacturer under the Bloomberg NEF classification, which may matter for certain bank financing options on commercial projects. The company does maintain a European distribution center in Germany, simplifying logistics and warranty support within the EU, and its PERC cell quality remains technically competitive. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/20221006180328551-compressed-67cb8f9dd392.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-455-MAH54Db](https://comparepv.com/panel/aiko-aiko-455-mah54db) | 455 W | +50 W, cooler, +2.6 pp | | [Longi Solar LR5-54HTH-455M](https://comparepv.com/panel/longi-lr5-54hth-455m) | 455 W | +50 W, +2.6 pp, -5 yr warranty | | [Yingli YL455CF54 e/2](https://comparepv.com/panel/yingli-yl455cf54-e-2) | 455 W | +50 W, lighter, +2.6 pp | | [Einnova Solarline ESM-455T](https://comparepv.com/panel/einnova-solarline-esm-455t) | 455 W | +50 W, lighter, +2.6 pp | | [SunEvo Solar SE5-54HBC-455W](https://comparepv.com/panel/sunevo-solar-se5-54hbc-455w) | 455 W | +50 W, +2.6 pp, -5 yr warranty | | [Just Solar JST-EDMH-(445-465)W-TD (455W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-455w-class) | 455 W | +50 W, lighter, +2.6 pp | | [Luxor Solar LX-455M/182R-96+ GG](https://comparepv.com/panel/luxor-lx-455m-182r-96-gg) | 455 W | +50 W, cooler, +2.6 pp | | [VSUN VSUN390-108BMH-DG](https://comparepv.com/panel/vsun-vsun390-108bmh-dg) | 390 W | -15 W, -0.8 pp | | [VSUN VSUN395-108BMH-DG](https://comparepv.com/panel/vsun-vsun395-108bmh-dg) | 395 W | -10 W, -0.5 pp | | [VSUN VSUN400-108BMH-DG](https://comparepv.com/panel/vsun-vsun400-108bmh-dg) | 400 W | -0.3 pp | | [VSUN VSUN410-108BMH](https://comparepv.com/panel/vsun-vsun410-108bmh) | 410 W | Lighter, +0.3 pp | | [VSUN VSUN415N-108MH](https://comparepv.com/panel/vsun-vsun415n-108mh) | 415 W | Cooler, lighter, +0.5 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +105 W, cooler, +4.3 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +90 W, cooler, +4.1 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +100 W, cooler, +4.0 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +85 W, cooler, +3.8 pp | --- Source: https://comparepv.com/panel/vsun-vsun405-108bmh-dg Not in this file, on the page: a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.