--- title: "JS Solar JSHC166M120-355 355W Solar Panel - Specs & Review | ComparePV" description: "JS Solar JSHC166M120-355 355W solar panel. Specs: 20.20% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/js-solar-jshc166m120-355" updated: 2026-09-11 --- # JS Solar JSHC166M120-355 Middle of its segment, needs the roof space 4,944 panels in the 255-455 W band, all technologies ## Identity - **Manufacturer:** JS Solar - **Model:** JSHC166M120-355 - **Series:** JSHC166M120 - **Rated power:** 355 W - **Cell technology:** Monocrystalline ## How it compares Compared against 255-455 W band, all technologies (4944 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 355 W | 415 W | Weak - bottom 16% | | | Module efficiency | 20.20% | 20.80% | Typical | 11,956 | | Power density | 195.0 | 207.9 | Weak - bottom 19% | 12,656 | | Temperature coefficient | -0.340 | -0.335 | Typical | 8,778 | | Weight (kg) | 20.2 kg | 21.6 kg | Typical | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 22% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.20% | 20.80% | Typical | 11,956 | | Power density | 195.0 | 207.9 | Weak - bottom 19% | 12,656 | | Temperature coefficient | -0.340 | -0.335 | Typical | 8,778 | | Weight per kWp | 56.9 | 54.2 | Typical | 10,920 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 22% | 9,798 | ### Watch out for - **195.0 watts per square metre** - Bottom 19% of the 255-455 W band, against a median of 207.9. - **25 year performance warranty** - Bottom 22% of the 255-455 W band, against a median of 30 yrs. - **Not ideal for:** Roofs where every square metre has to count and owners who want a long output guarantee. ## Specification ### Electrical - **Rated power (Pmax):** 355 W - **Efficiency:** 20.20 % - **Voltage at Pmax (Vmp):** 30.72 V - **Current at Pmax (Imp):** 11.56 A - **Open-circuit voltage (Voc):** 36.84 V - **Short-circuit current (Isc):** 12.33 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:** 120 ### Physical - **Length:** 1754 mm - **Width:** 1038 mm - **Thickness:** 35 mm - **Weight:** 20.2 kg - **Area:** 1.82 m2 - **Power density:** 195.0 Wp/m2 ### Warranty and degradation - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 84.8 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.55 % - **Output after 30 years:** 291 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 11956 of 14005 | | Power density | 12656 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 10920 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Peak efficiency 21.3% — segment leader** - The top-bin variant reaches 21.3% module efficiency, outperforming all peer comparables: ENCOR EC (20.59%), Boviet GAMMA SERIES™ (20.2%), and Boviet VEGA SERIES (20.0%). For space-constrained rooftops, this translates into meaningfully higher power output per m². - **Half-cut cells + multi-busbar (MBB)** - Halving the cell reduces per-string current by 50%, cutting I²R resistive losses and lowering hot-spot risk under partial shading. The MBB design reduces thermal stress in silver paste interconnects, statistically decreasing LeTID micro-crack incidence over the module's service life. - **Dual corrosion-resistance certification** - The series carries verified salt-mist resistance (IEC 61701) and ammonia corrosion resistance (IEC 62716) — no peer comparable (Boviet VEGA, Boviet GAMMA, ENCOR EC) lists both certifications simultaneously. This provides a genuine advantage for agrivoltaic and coastal installations where accelerated frame and bypass-diode degradation is a known risk. - **M6 wafer (166 mm) — mature cell format** - The M6 166 mm format is one of the most thoroughly validated wafer standards in the PV industry, with multi-source wafer availability. Unlike the newer G12 (210 mm) format, it avoids racking and transport compatibility issues with standard steel mounting systems commonly used in European residential and C&I installations. - **25-year linear power warranty** - The manufacturer guarantees a linear power degradation schedule for 25 years, matching the warranty terms of all peer comparables. The guaranteed residual power after year 25 (typically ≥80.7%) supports LCOE assumptions for residential prosumers and small commercial projects. ## Cons - **Not BNEF Tier-1 bankable** - JS Solar does not appear on the BNEF Tier-1 PV module manufacturer list (Q1 2026), while direct peer comparable Boviet Solar holds that status. For projects financed on a non-recourse basis by lenders requiring Tier-1 modules, the JSHC166M120 series may be excluded from approved component lists without additional manufacturer due diligence. - **Monofacial only — no bifacial variant** - The series offers no bifacial option, whereas the Boviet VEGA SERIES (same max power of 375 Wp) is available in a bifacial configuration with a potential 5–15% yield gain from ground albedo. For ground-mounted systems on reflective substrates or green rooftops, the absence of a bifacial option results in a measurable long-term energy yield disadvantage. ## About this series The JS Solar JSHC166M120 series consists of advanced photovoltaic modules that utilize **half-cut cell technology** to maximize energy yields in real-world installation conditions. Thanks to the use of M6 standard silicon wafers with a size of 166 mm, these panels offer an excellent power-to-area ratio, making them an ideal choice for installations with limited roof space. A key distinguishing feature of the series is the **multi-busbar design**, which not only reduces resistive losses but also significantly limits the risk of micro-cracks under the influence of varying temperatures. These modules effectively solve the problem of performance drops during partial shading, allowing for stable system operation even in more challenging location conditions. They are intended for both individual prosumers and commercial investors looking for reliable components with **high resistance to mechanical loads**, such as heavy snow or strong wind gusts. Compared to the competition, JS Solar JSHC166M120 stands out with its excellent material durability and certified **resistance to ammonia and salt corrosion**, which guarantees a long power plant lifespan even in demanding agricultural or coastal environments. This is a sound choice for professionals focusing on proven engineering and investment cost optimization. ## Notable figures - At 20.2% efficiency, this panel is 1.6pp below the \*\*database\*\* median of 21.8% - Power density of 195.0 W/m² is 23.1 W/m² below \*\*database\*\* median (218.1 W/m²) - needs more roof space - -0.34%/°C temperature coefficient - 0.04pp worse than \*\*database\*\* median (-0.30%/°C), expect higher hot weather losses - 20.2 kg weight - 6.3 kg lighter than \*\*database\*\* median (26.5 kg), reducing installation effort - #11956 for efficiency, #8778 for temperature performance out of 14005 panels ## Questions ### What are half-cut cells in the JS Solar JSHC166M120 series and what do they mean in practice? Half-cut cells are standard monocrystalline cells sliced in half, which reduces the current flowing through each half and lowers resistive losses. In practice this means higher output power and better tolerance for partial shading. The JSHC166M120 series pairs this technology with a multi-busbar design that further minimizes microcrack risk and extends module service life under variable thermal conditions. ### How does the JS Solar JSHC166M120 series handle partial shading from a chimney or trees? Thanks to the half-cut design, each module is divided into two independent electrical sections. If shade covers only part of the panel, the shaded section operates on its own without blocking current flow through the rest of the array. Energy losses under partial shading are noticeably lower than with conventional full-cell modules, resulting in a higher annual energy yield even in challenging locations. ### What is the power warranty on the JS Solar JSHC166M120 series? JS Solar provides a 25-year linear power warranty on the JSHC166M120 series, guaranteeing that module output stays above a defined threshold throughout the entire period — a standard comparable to leading market brands. The product warranty covering material and workmanship defects is typically 10–12 years. Confirm exact terms with your local distributor before purchase. ### Can the 375 W JS Solar JSHC166M120 panel withstand heavy snow loads and strong winds? Yes. The JSHC166M120 series is built for high mechanical resistance. Modules are rated for snow loads up to 5,400 Pa and wind loads up to 2,400 Pa, corresponding to deep snow cover and strong wind gusts. The multi-busbar construction distributes mechanical stress across a greater number of busbars, minimizing microcracks caused by cyclic temperature changes and dynamic loading. ### Is the JS Solar JSHC166M120 suitable for farm installations or coastal locations? Yes. The JSHC166M120 series holds certifications confirming resistance to ammonia corrosion, common in livestock farming environments, and to salt mist corrosion found in coastal areas. This ensures the modules maintain their structural integrity and performance output across the full 25-year service life — a key differentiator compared to cheaper modules lacking these certifications. ### Is JS Solar a Tier 1 manufacturer, and is it worth buying panels from this brand? JS Solar is not currently listed in the Bloomberg NEF Tier 1 ranking, meaning it is not classified among the largest, most financially backed manufacturers. For residential and smaller commercial installations this is rarely a barrier — the JSHC166M120 carries verified quality certifications and a solid technical specification. When purchasing, ensure you work with an authorized distributor and confirm how the warranty is handled locally. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/8710d08c0a803a6cee2fb814e4d94c94-d4c06e5b5157.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [JA Solar NS-330MH-80](https://comparepv.com/panel/ja-solar-ns-330mh-80) | 330 W | Cooler, lighter, +2.9 pp | | [PolyCrown Solar Tech NS-330MH-80](https://comparepv.com/panel/polycrown-solar-tech-ns-330mh-80) | 330 W | Cooler, lighter, +2.9 pp | | [Gamko New Energy GKA210M320W](https://comparepv.com/panel/gamko-new-energy-gka210m320w) | 320 W | Lighter, +2.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M340W](https://comparepv.com/panel/gamko-new-energy-gka210m340w) | 340 W | Lighter, +2.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M360W](https://comparepv.com/panel/gamko-new-energy-gka210m360w) | 360 W | Lighter, +2.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M380W (1/4\*4\*38)](https://comparepv.com/panel/gamko-new-energy-gka210m380w-1-4-4-38) | 380 W | Lighter, +2.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M400W (1/2\*4\*20)](https://comparepv.com/panel/gamko-new-energy-gka210m400w-1-2-4-20) | 400 W | +45 W, +2.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M400W (1/4\*4\*40)](https://comparepv.com/panel/gamko-new-energy-gka210m400w-1-4-4-40) | 400 W | +45 W, +2.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M380W (1/2\*4\*19)](https://comparepv.com/panel/gamko-new-energy-gka210m380w-1-2-4-19) | 380 W | Lighter, +2.8 pp, +5 yr warranty | | [Maxeon SPR-MAX3-400-COM](https://comparepv.com/panel/maxeon-spr-max3-400-com) | 400 W | Cooler, +2.4 pp, +15 yr warranty | | [JS Solar JSHC166M120-350](https://comparepv.com/panel/js-solar-jshc166m120-350) | 350 W | -1.3 pp | | [JS Solar JSHC166M120-360](https://comparepv.com/panel/js-solar-jshc166m120-360) | 360 W | +0.3 pp | | [JS Solar JSHC166M120-365](https://comparepv.com/panel/js-solar-jshc166m120-365) | 365 W | +10 W, +0.5 pp | | [JS Solar JSHC166M120-370](https://comparepv.com/panel/js-solar-jshc166m120-370) | 370 W | +15 W, +0.8 pp | | [JS Solar JSHC166M120-375](https://comparepv.com/panel/js-solar-jshc166m120-375) | 375 W | +20 W, +1.1 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +155 W, cooler, +4.8 pp | --- Source: https://comparepv.com/panel/js-solar-jshc166m120-355 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.