--- title: "Shinson Technology S665M66P4BF 665W Solar Panel - Specs & Review | ComparePV" description: "Shinson Technology S665M66P4BF 665W solar panel. Specs: 21.40% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/shinson-technology-s665m66p4bf" updated: 2026-09-11 --- # Shinson Technology S665M66P4BF Middle of its segment, heavy for its output 4,929 panels in the 565-765 W band, all technologies ## Identity - **Manufacturer:** Shinson Technology - **Model:** S665M66P4BF - **Series:** S-Max SXXXM66P4BF - **Rated power:** 665 W - **Cell technology:** Monocrystalline - **Bifacial:** yes ## How it compares Compared against 565-765 W band, all technologies (4929 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 665 W | 620 W | Strong - top 23% | | | Module efficiency | 21.40% | 22.58% | Weak - bottom 14% | 8,323 | | Power density | 214.1 | 225.8 | Weak - bottom 15% | 8,250 | | Temperature coefficient | -0.340 | -0.290 | Weak - bottom 13% | 8,778 | | Weight (kg) | 38.0 kg | 33.0 kg | Weak - bottom 10% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.40% | 22.58% | Weak - bottom 14% | 8,323 | | Power density | 214.1 | 225.8 | Weak - bottom 15% | 8,250 | | Temperature coefficient | -0.340 | -0.290 | Weak - bottom 13% | 8,778 | | Weight per kWp | 57.1 | 53.1 | Weak - bottom 10% | 11,052 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **57.1 kg per kWp** - Bottom 10% of the 565-765 W band, against a median of 53.1. - **-0.340 %/°C temperature coefficient** - Bottom 13% of the 565-765 W band, against a median of -0.290. - **21.40% module efficiency** - Bottom 14% of the 565-765 W band, against a median of 22.58%. - **Not ideal for:** Weight-limited structures, hot climates and tight roof space. ## Specification ### Electrical - **Rated power (Pmax):** 665 W - **Efficiency:** 21.40 % - **Voltage at Pmax (Vmp):** 38.30 V - **Current at Pmax (Imp):** 17.39 A - **Open-circuit voltage (Voc):** 46.10 V - **Short-circuit current (Isc):** 18.50 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:** 43 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell count:** 132 - **Bifacial:** yes - **Bifacial gain:** 30.00 ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 38.0 kg - **Area:** 3.11 m2 - **Power density:** 214.1 Wp/m2 ### Warranty and degradation - **Product warranty:** 30 years - **Performance warranty:** 30 years - **Annual degradation:** 0.50 % - **Output after 30 years:** 562 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 8323 of 14005 | | Power density | 8250 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 11052 of 14005 | | Warranty | 21 of 14005 | ## About this series The Shinson Technology S-Max SXXXM66P4BF series redefines performance standards through the use of advanced **bifacial technology**, which allows for efficient clean energy generation from both sides of the module. This design is particularly beneficial in the context of solar conditions in Poland, where utilizing light reflected from the ground significantly increases the total annual yield from the installation. A key distinguishing feature of the series is the integration of high-efficiency cells, which translates into **minimal light-induced degradation** and stable operation even under diffuse radiation conditions. These modules effectively solve the problem of limited mounting space, offering maximum power density while maintaining exceptional mechanical resistance to snow and wind loads. The **double tempered glass** used not only effectively protects the silicon against micro-cracks but also extends the system's lifespan, making it a secure capital investment for decades. This solution is designed for professional investors implementing large-scale projects and commercial rooftop systems that require the highest operational reliability. Compared to traditional panels, the S-Max series offers an **excellent bifaciality factor**, positioning it as a leader in cost-efficiency for modern photovoltaic farms where every kilowatt-hour obtained per square meter of available ground or roof space counts. ## Notable figures - At 21.4% efficiency, this panel is on par with typical \*\*database\*\* modules - At 214.1 W/m², this panel generates 4.0 W/m² less per unit area than \*\*database\*\* median (218.1 W/m²) - At -0.34%/°C, loses 0.04pp more power per degree than \*\*database\*\* median (-0.30%/°C) - At 38.0 kg, this panel is 11.5 kg heavier than the \*\*database\*\* median (26.5 kg) - more demanding for installation crews - In the top 59% for efficiency among all N-type panels ## Questions ### Does the bifacial technology in the Shinson S-Max SXXXM66P4BF series actually boost energy output in Poland? Yes. The bifacial design lets S-Max modules capture sunlight on both the front and rear surfaces — the rear absorbs light reflected from the ground, snow, or a light-colored rooftop. In Polish conditions, where a significant portion of irradiance arrives as diffuse or reflected light, a bifacial module can yield 5–25% more annual energy compared to a monofacial module of the same nameplate power. ### What warranty does the Shinson S-Max SXXXM66P4BF series come with, and what does it cover? The S-Max SXXXM66P4BF series carries a 30-year product warranty covering material defects and workmanship, plus a 30-year linear power warranty guaranteeing minimum output retention over three decades. This is one of the longest warranties available on the market today and makes the series a reliable long-term asset for commercial rooftop systems and utility-scale PV farms. ### Does the double tempered glass construction in the Shinson S-Max SXXXM66P4BF really protect against cell microcracks? Yes. The glass-glass structure removes the rear backsheet, which is the primary source of thermomechanical stress that causes microcracks. Both tempered glass panes form a rigid, symmetric enclosure that minimizes deformation during temperature cycling. This also increases resistance to snow and wind loads — an important factor for Polish winters — and extends the module's service life well beyond 30 years. ### What installation types is the Shinson S-Max SXXXM66P4BF designed for — is it suitable for warehouse rooftops or industrial facilities? The S-Max SXXXM66P4BF was specifically engineered for commercial and utility-scale projects: ground-mounted PV farms and large rooftop systems on warehouses, manufacturing halls, and commercial buildings. Its high power density at up to 665 Wp per module maximizes output per square meter of limited roof space. The glass-glass mechanical durability also makes it well-suited for structures exposed to high wind loads. ### What is the peak power of the Shinson S-Max SXXXM66P4BF and what does it mean for project economics? The S-Max SXXXM66P4BF reaches a peak power of 665 Wp under STC conditions. In practice, a 1 MWp plant requires roughly 1,504 modules — fewer than with lower-power 500–550 Wp panels. Fewer modules mean reduced BoS costs: less racking, cabling, and installation labor. This directly improves the project's LCOE, making the series highly cost-competitive for utility-scale and commercial PV developers. ### Do the Shinson S-Max SXXXM66P4BF panels perform well on cloudy days and in low-light conditions? Yes. The cells used in the S-Max series feature low light-induced degradation (LID) and maintain stable output under diffuse irradiance typical of Polish autumn and winter skies. The bifacial architecture further captures reflected light from the ground even under overcast conditions. As a result, the series sustains a high fill factor on its I-V curve even well below the nominal irradiance of 1,000 W/m². ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/P4-bifacial-650-665W-ea63a4ef19b3.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +3.8 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, lighter, +3.8 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, lighter, +3.6 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +3.6 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +35 W, cooler, +3.6 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | Cooler, lighter, +3.5 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +3.4 pp | | [Shinson Technology S650M66P4BF](https://comparepv.com/panel/shinson-technology-s650m66p4bf) | 650 W | -15 W, -0.5 pp | | [Shinson Technology S655M66P4](https://comparepv.com/panel/shinson-technology-s655m66p4) | 655 W | Lighter, -0.3 pp, -5 yr warranty | | [Shinson Technology S660M66P4BF](https://comparepv.com/panel/shinson-technology-s660m66p4bf) | 660 W | Very close match | | [Shinson Technology S670M66P4](https://comparepv.com/panel/shinson-technology-s670m66p4) | 670 W | Lighter, +0.2 pp, -5 yr warranty | | [Shinson Technology S680M66NT4BF](https://comparepv.com/panel/shinson-technology-s680m66nt4bf) | 680 W | +15 W, cooler, +0.5 pp | | [Shinson Technology S685M66NT4BF](https://comparepv.com/panel/shinson-technology-s685m66nt4bf) | 685 W | +20 W, cooler, +0.7 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +140 W, cooler, +3.7 pp | | [AIKO AIKO-A800-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a800-grh78dw) | 800 W | +135 W, cooler, +3.5 pp | | [AIKO AIKO-A795-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a795-grh78dw) | 795 W | +130 W, cooler, +3.4 pp | --- Source: https://comparepv.com/panel/shinson-technology-s665m66p4bf 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.