--- title: "Shinson Technology S655M66P4 655W Solar Panel - Specs & Review | ComparePV" description: "Shinson Technology S655M66P4 655W solar panel. Specs: 21.10% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/shinson-technology-s655m66p4" updated: 2026-09-11 --- # Shinson Technology S655M66P4 Middle of its segment, short guarantee 320 panels in the segment PERC 650-700 W ## Identity - **Manufacturer:** Shinson Technology - **Model:** S655M66P4 - **Series:** S-Max - **Rated power:** 655 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 650-700 W (320 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 655 W | 660 W | Weak - bottom 25% | | | Module efficiency | 21.10% | 21.25% | Typical | 9,297 | | Power density | 210.9 | 212.5 | Weak - bottom 24% | 9,459 | | Temperature coefficient | -0.340 | -0.340 | Typical | 8,778 | | Weight (kg) | 34.4 kg | 34.5 kg | Typical | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 21% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.10% | 21.25% | Typical | 9,297 | | Power density | 210.9 | 212.5 | Weak - bottom 24% | 9,459 | | Temperature coefficient | -0.340 | -0.340 | Typical | 8,778 | | Weight per kWp | 52.5 | 52.3 | Typical | 6,117 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 21% | 9,798 | ### Watch out for - **25 year performance warranty** - Bottom 21% of the PERC 650-700 W segment, against a median of 30 yrs. - **210.9 watts per square metre** - Bottom 24% of the PERC 650-700 W segment, against a median of 212.5. - **Best for:** Commercial and utility-scale. - **Not ideal for:** Owners who want a long output guarantee and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 655 W - **Efficiency:** 21.10 % - **Voltage at Pmax (Vmp):** 37.60 V - **Current at Pmax (Imp):** 17.43 A - **Open-circuit voltage (Voc):** 45.50 V - **Short-circuit current (Isc):** 18.48 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:** 0.050 %/degC - **NOCT:** 43 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 132 ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 34.4 kg - **Area:** 3.11 m2 - **Power density:** 210.9 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 years - **Performance warranty:** 25 years - **Annual degradation:** 0.50 % - **Output after 30 years:** 553 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 9297 of 14005 | | Power density | 9459 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 6117 of 14005 | | Warranty | 9798 of 14005 | ## About this series The Shinson Technology S-Max series consists of modules designed for commercial installations and large-scale PV farms, where maximizing energy yield from each module and quickly reducing construction and cabling costs are key. A key advantage of this series is its **high power density**, which allows for greater energy generation from the same area and simplifies the BOS (Balance of System) design. Depending on the variant, S-Max utilizes modern approaches to solar cells, including N-type and **HJT technology** - which is valued for its stable operation at higher temperatures and good performance in low-sunlight conditions. For investors, **long warranties** and a focus on durability are also important. The series was marketed as being tested for hail resistance, which increases the safety of operation in more challenging conditions. S-Max is a sensible choice for C&I (Commercial and Industrial) applications, farms, and roofs with limited surface area, when you want to combine **high reliability** with above-average energy production without paying extra for competitor marketing. ## Notable figures - Efficiency of 21.1% matches the \*\*PERC 650-700W\*\* median - At 210.9 W/m² power density, roof space requirements are typical for \*\*PERC 650-700W\*\* panels - At -0.34%/°C, hot weather performance is typical for \*\*PERC 650-700W\*\* panels - In the top 66% for efficiency among all PERC panels ## Questions ### What is TOPCon technology and why does the Shinson S-Max series use it? TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell technology that reduces recombination losses, achieving higher efficiency than conventional PERC cells. In the S-Max series, this translates to up to 720 Wp per module, better temperature stability, and lower power loss on hot days. For large-scale C&I and utility projects, every efficiency point has a direct impact on the overall LCOE of the system. ### What warranty do Shinson Technology S-Max panels carry? The S-Max series comes with a 30-year product warranty and a 30-year linear power output warranty. The manufacturer guarantees a defined minimum power level for three decades of operation. For developers financing PV farms or C&I installations, this is one of the most important parameters in the investment return calculation and project bankability assessment. ### What is the peak power output of a Shinson S-Max module and how much does it reduce construction costs? The top S-Max variant delivers 720 Wp per module. This high unit power reduces the total module count for a given capacity, shortens DC string runs, and lowers overall BoS costs. For a 1 MWp utility farm you need roughly 1,389 S-Max 720 Wp modules instead of over 1,600 at 600 Wp. Shinson claims BoS cost savings of more than 15% compared to lower-wattage modules. ### Are Shinson S-Max panels suitable for an industrial rooftop or warehouse? Yes — the S-Max series was designed primarily for commercial and industrial (C&I) rooftop systems and large-scale PV farms. Its high power density maximizes energy yield from the limited roof area of warehouses and production facilities. Before installation, the roof structure should be verified for load-bearing capacity, as 720 Wp modules have larger dimensions and correspondingly higher weight. ### Are Shinson S-Max panels hail-resistant? Yes. The S-Max series has successfully passed a 45 mm hailstone impact test. This is a meaningful durability credential for installations in regions prone to severe hailstorms. Hail resistance is one of the key resilience benchmarks Shinson highlights for this series, alongside the 30-year product and power output warranty. ### How do Shinson S-Max modules perform in overcast conditions and high summer temperatures? N-type TOPCon cells have a lower temperature coefficient (Pmax) than conventional PERC cells, meaning less power loss on hot days. N-type technology also delivers better performance under diffuse irradiance on cloudy days. For year-round installations in climates with frequent cloud cover, this translates to a measurably higher annual energy yield compared to older PERC-based modules. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/P4-Monofacial-650-670W-eccba0e5e7b3.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +4.1 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, lighter, +4.1 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, lighter, +3.9 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +3.9 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | Cooler, +3.9 pp, +5 yr warranty | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | Cooler, +3.8 pp, +5 yr warranty | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +3.7 pp | | [Shinson Technology S650M66P4BF](https://comparepv.com/panel/shinson-technology-s650m66p4bf) | 650 W | Heavier, -0.2 pp, +5 yr warranty | | [Shinson Technology S660M66P4BF](https://comparepv.com/panel/shinson-technology-s660m66p4bf) | 660 W | Heavier, +5 yr warranty | | [Shinson Technology S665M66P4BF](https://comparepv.com/panel/shinson-technology-s665m66p4bf) | 665 W | Heavier, +0.3 pp, +5 yr warranty | | [Shinson Technology S670M66P4](https://comparepv.com/panel/shinson-technology-s670m66p4) | 670 W | +15 W, +0.5 pp | | [Shinson Technology S680M66NT4BF](https://comparepv.com/panel/shinson-technology-s680m66nt4bf) | 680 W | Heavier, +0.8 pp, +5 yr warranty | | [Shinson Technology S685M66NT4BF](https://comparepv.com/panel/shinson-technology-s685m66nt4bf) | 685 W | Heavier, +0.9 pp, +5 yr warranty | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +150 W, cooler, +4.0 pp | | [AIKO AIKO-A800-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a800-grh78dw) | 800 W | +145 W, cooler, +3.8 pp | | [AIKO AIKO-A795-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a795-grh78dw) | 795 W | +140 W, cooler, +3.7 pp | --- Source: https://comparepv.com/panel/shinson-technology-s655m66p4 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.