--- title: "VSUN VSUN660-132BMH-DG 660W Solar Panel - Specs & Review | ComparePV" description: "VSUN VSUN660-132BMH-DG 660W solar panel. Specs: 21.25% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/vsun-vsun660-132bmh-dg" updated: 2026-09-11 --- # VSUN VSUN660-132BMH-DG Middle of its segment, heavy for its output 320 panels in the segment PERC 650-700 W ## Identity - **Manufacturer:** VSUN - **Model:** VSUN660-132BMH-DG - **Series:** VSUN 132BMH-DG - **Rated power:** 660 W - **Cell technology:** PERC - **Bifacial:** yes ## How it compares Compared against segment PERC 650-700 W (320 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 660 W | 660 W | Typical | | | Module efficiency | 21.25% | 21.25% | Typical | 8,904 | | Power density | 212.5 | 212.5 | Typical | 8,959 | | Temperature coefficient | -0.340 | -0.340 | Typical | 8,778 | | Weight (kg) | 38.5 kg | 34.5 kg | Weak - bottom 17% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.25% | 21.25% | Typical | 8,904 | | Power density | 212.5 | 212.5 | Typical | 8,959 | | Temperature coefficient | -0.340 | -0.340 | Typical | 8,778 | | Weight per kWp | 58.3 | 52.3 | Weak - bottom 17% | 11,655 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **58.3 kg per kWp** - Bottom 17% of the PERC 650-700 W segment, against a median of 52.3. - **Best for:** Commercial, utility-scale and shaded-installations. - **Not ideal for:** Weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 660 W - **Efficiency:** 21.25 % - **Voltage at Pmax (Vmp):** 37.65 V - **Current at Pmax (Imp):** 17.53 A - **Open-circuit voltage (Voc):** 45.32 V - **Short-circuit current (Isc):** 18.65 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.340 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 132 - **Bifacial:** yes ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 38.5 kg - **Area:** 3.11 m2 - **Power density:** 212.5 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 85.0 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.45 % - **Output after 30 years:** 561 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 8904 of 14005 | | Power density | 8959 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 11655 of 14005 | | Warranty | 21 of 14005 | ## About this series The VSUN 132BMH-DG series are bifacial modules with a double-glass construction, designed to maximize energy yield in installations where every square meter counts. Due to their bifacial operation, these panels can utilize reflected light from the ground, significantly improving energy production in ground-mounted, flat-roof, and elevated installations. A key advantage is the **dual-glass construction**, which enhances rigidity, resistance to micro-cracks, and long-term stability. The use of **half-cut cells** reduces resistance losses and improves performance under partial shading, which is a common issue on roofs with obstructions. Another advantage of this series is the **bifacial technology**, which provides additional yield without requiring any further installation modifications. In practice, this is a good choice for investors who expect **higher production under diffuse light conditions** and want to minimize the risk of performance degradation over time. This series is suitable for both modern prosumer installations and commercial projects focused on profitability. ## Notable figures - At 21.2% efficiency, this panel is on par with typical \*\*PERC 650-700W\*\* modules - At 212.5 W/m² power density, roof space requirements are typical for \*\*PERC 650-700W\*\* panels - Temperature coefficient of -0.34%/°C matches the \*\*PERC 650-700W\*\* median - At 38.5 kg (4.0 kg above \*\*PERC 650-700W\*\* median of 34.5 kg), requires checking roof load capacity - 70% bifaciality enables rear-side power generation, boosting yield by 4-10% on reflective surfaces ## Questions ### Is the VSUN 132BMH-DG panel series still available for purchase? The VSUN 132BMH-DG series, including the up-to-670 Wp variant, has been discontinued by VSUN and is no longer part of the manufacturer's current lineup. Availability is now limited to remaining distributor stock. If you're expanding an existing installation with the same panels, check stock levels in advance, since once supplies run out an identical model will no longer be orderable. ### How much extra energy does bifacial technology add on VSUN 132BMH-DG panels? Thanks to their two-sided design, these panels capture light reflected off the ground, typically adding a yield gain of roughly a few percent up to the low teens compared to a monofacial module of the same front-side rating, depending on conditions such as bright roofing, gravel, or snow. The actual gain depends on mounting height above the ground, surface albedo, and tilt angle, so the best results come from ground-mount arrays and elevated racking systems. ### How does the double-glass design differ from a standard glass-backsheet panel? In the double-glass construction, the rear backsheet layer is replaced with a second tempered glass sheet, increasing module rigidity, improving resistance to cell microcracks, and reducing long-term degradation, including PID effects. This design is also a technical requirement for bifacial operation, since it lets light pass through from the rear. The trade-off is a somewhat higher module weight compared to a backsheet version. ### How do half-cut cells affect performance under partial shading? Half-cut cells split the module into smaller electrical sections, so shading part of the panel, for example from a chimney, antenna, or leaves, causes a smaller drop in total output than with a full-cell design. Lower currents in each circuit also reduce resistive losses and slightly lower cell operating temperature, resulting in higher real-world efficiency under everyday shading conditions. ### What warranty comes with VSUN 132BMH-DG panels? The manufacturer backs the series with a 25-year product warranty and a 30-year linear power output warranty, covering material and manufacturing defects as well as a guaranteed minimum energy output over the panel's lifetime. Since this model has been discontinued, warranty service may involve replacement with a comparable model if an identical panel is no longer available. ### Is PERC cell technology in the VSUN 132BMH-DG series outdated compared to TOPCon? PERC is a proven, stable cell technology that VSUN used for the 132BMH-DG series, delivering up to 670 Wp at a typical efficiency around 21-22%. Newer TOPCon and HJT cells achieve higher efficiency and lower annual degradation, which is one reason manufacturers have been phasing out PERC lines and why this series was discontinued. For existing installations, PERC remains a fully functional and efficient solution throughout the warranty period. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/661e0f58a113f-fa14b93cab00.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +3.9 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, lighter, +3.9 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, lighter, +3.8 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +3.8 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +40 W, cooler, +3.8 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | Cooler, lighter, +3.6 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +3.6 pp | | [VSUN CSUN645-132M](https://comparepv.com/panel/vsun-csun645-132m) | 645 W | Lighter, -0.5 pp, -5 yr warranty | | [VSUN VSUN655-132BMH-DG](https://comparepv.com/panel/vsun-vsun655-132bmh-dg) | 655 W | Very close match | | [VSUN VSUN665-132BMH-DG](https://comparepv.com/panel/vsun-vsun665-132bmh-dg) | 665 W | Very close match | | [VSUN VSUN670-132BMH-DG](https://comparepv.com/panel/vsun-vsun670-132bmh-dg) | 670 W | +10 W, +0.3 pp | | [VSUN VSUN685N-132BMH-DG](https://comparepv.com/panel/vsun-vsun685n-132bmh-dg) | 685 W | +25 W, cooler, +0.8 pp | | [VSUN VSUN690N-132BMHT-DG](https://comparepv.com/panel/vsun-vsun690n-132bmht-dg) | 690 W | +30 W, cooler, +1.0 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +145 W, cooler, +3.9 pp | | [AIKO AIKO-A800-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a800-grh78dw) | 800 W | +140 W, cooler, +3.6 pp | | [AIKO AIKO-A795-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a795-grh78dw) | 795 W | +135 W, cooler, +3.6 pp | --- Source: https://comparepv.com/panel/vsun-vsun660-132bmh-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.