--- title: "JS Solar JS375M120 375W Solar Panel - Specs & Review | ComparePV" description: "JS Solar JS375M120 375W solar panel. Specs: 20.30% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/js-solar-js375m120" updated: 2026-09-11 --- # JS Solar JS375M120 Strong in heat, no clear weak spot 579 panels in the segment PERC 350-400 W ## Identity - **Manufacturer:** JS Solar - **Model:** JS375M120 - **Series:** JS-PERC SERIES - **Rated power:** 375 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 350-400 W (579 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 375 W | 380 W | Typical | | | Module efficiency | 20.30% | 19.90% | Strong - top 16% | 11,769 | | Power density | 202.7 | 199.0 | Strong - top 19% | 11,824 | | Temperature coefficient | -0.300 | -0.350 | Strong - top 3% | 6,093 | | Weight (kg) | 19.0 kg | 21.4 kg | Strong - top 7% | | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.30% | 19.90% | Strong - top 16% | 11,769 | | Power density | 202.7 | 199.0 | Strong - top 19% | 11,824 | | Temperature coefficient | -0.300 | -0.350 | Strong - top 3% | 6,093 | | Weight per kWp | 50.7 | 55.8 | Strong - top 7% | 4,094 | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Strengths - **-0.300 %/°C temperature coefficient** - Top 3% of the PERC 350-400 W segment, against a median of -0.350. Ranked 6,093rd in the whole database. - **50.7 kg per kWp** - Top 7% of the PERC 350-400 W segment, against a median of 55.8. Ranked 4,094th in the whole database. - **20.30% module efficiency** - Top 16% of the PERC 350-400 W segment, against a median of 19.90%. - **Best for:** Residential, commercial, shaded-installations and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 375 W - **Efficiency:** 20.30 % - **Voltage at Pmax (Vmp):** 34.30 V - **Current at Pmax (Imp):** 10.94 A - **Open-circuit voltage (Voc):** 41.00 V - **Short-circuit current (Isc):** 11.61 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.300 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.046 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 120 ### Physical - **Length:** 1765 mm - **Width:** 1048 mm - **Thickness:** 30 mm - **Weight:** 19.0 kg - **Area:** 1.85 m2 - **Power density:** 202.7 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **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:** 308 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 11769 of 14005 | | Power density | 11824 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 4094 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Wide power range – 16 variants** - The series covers 16 models from 360 to 555 Wp, enabling precise system sizing for residential rooftops (≤360 Wp) through mid-scale commercial arrays (up to 555 Wp) without mixing series. - **Up to 21.7% efficiency – top PERC tier** - Peak efficiency of 21.7% matches peer comparable Jinko Solar in the PERC segment and outperforms both Boviet Solar Vega (21.3%) and Shinson S-Max™ (21.48%), placing the series at the forefront of its cell technology class. - **Half-cut cells + MBB – lower losses** - Combining half-cut cells with Multi-Busbar (MBB) interconnection shortens current paths, reducing series resistance and partial-shading losses by up to 30% vs. conventional full-cell modules — particularly relevant for rooftops with chimneys or dormers. - **PID degradation resistance** - Modules feature PID-resistant passivation, essential for transformerless (TL) inverter systems operating at 1000 V DC, eliminating the risk of power loss caused by sodium ion migration through the laminate glass. - **25-year linear power warranty** - The manufacturer guarantees a 25-year linear power output warranty in line with the industry standard, confirming long-term reliability under Polish climate conditions with temperature swings from -30°C to +40°C. ## Cons - **PERC displaced by N-type TOPCon** - P-type PERC technology suffers first-year LID of 2–3% and annual degradation of ~0.45–0.55%, whereas N-type TOPCon modules (the dominant 2025–2026 market standard) exhibit LID below 0.5% and ~0.25–0.40%/yr degradation, resulting in approximately 8–12% higher cumulative energy yield over a 25-year system lifetime. - **Not BNEF Tier-1 bankable** - JS Solar does not appear on the BNEF Tier-1 list (Q1 2026), meaning it does not meet bankability criteria required for non-recourse project finance. Peer comparable Jinko Solar holds confirmed Tier-1 status — a material distinction for larger installations seeking third-party financing or leasing. - **15-year product warranty** - The materials and workmanship (product) warranty is only 15 years, compared to the 25-year product warranty offered as standard by Jinko Solar and JA Solar at comparable wattage and technology, increasing the risk of out-of-pocket replacement costs mid-installation lifecycle. - **No bifacial option in the series** - All 16 variants are strictly monofacial — the series offers no bifacial model. Bifacial PERC modules in the same wattage class (e.g., JA Solar JAM72D30) deliver 5–20% additional annual yield depending on ground albedo, a meaningful production delta in Poland where snow cover and light-colored roofing enhance bifacial gain. ## About this series The JS-PERC series from JS Solar features advanced modules based on monocrystalline cell technology with an additional passivation layer, which directly translates into higher efficiency in low-light conditions. The **Half-Cut cell technology** used in them effectively reduces energy losses resulting from internal resistance and partial shading of the module, which is crucial on roofs with complex geometry. These panels solve the problem of limited installation space, delivering more power from every square meter thanks to **high energy conversion efficiency**. The design based on **Multi-Busbar connections** shortens the path of electron flow, minimizing the risk of micro-cracks and increasing resistance to extreme weather events. The series stands out from the competition with excellent **resistance to PID-induced degradation** and a low temperature coefficient, which guarantees stable system operation even during summer heatwaves. It is an ideal solution for prosumers and companies looking for solid components that combine modern technical innovations with long-term reliability, ensuring a fast return on investment in the Polish climate. Thanks to precise workmanship, these modules form the foundation of an efficient and safe photovoltaic micro-installation. ## Notable figures - 20.3% module efficiency - 0.9pp better than the \*\*PERC 0-400W\*\* median of 19.4% - At 202.7 W/m² power density, this panel generates 8.3 W/m² more per unit area than \*\*PERC 0-400W\*\* median (194.4 W/m²) - Temperature coefficient of -0.30%/°C vs median -0.36%/°C means ~2% less power loss at 65°C - 19.0 kg weight - 1.5 kg lighter than \*\*PERC 0-400W\*\* median (20.5 kg), reducing installation effort - In the top 84% for efficiency among all PERC panels ## Questions ### What warranty does JS Solar offer on the JS-PERC Series panels? JS Solar provides a two-tier warranty for the JS-PERC Series: a 15-year product warranty covering material and manufacturing defects, and a 25-year linear power output warranty protecting against excessive cell degradation over time. This ensures the investment is covered for a full quarter century, in line with industry standards for residential and commercial PV systems. ### Can JS-PERC Series panels handle partial shading on a roof? Yes. The JS-PERC Series uses half-cut cell technology, which splits each cell into two independent halves. This means that shading from a chimney, antenna, or dormer window only reduces output in the shaded section rather than affecting the entire module. This makes the series particularly suitable for roofs with complex geometry or unavoidable obstructions. ### What is PERC technology and is the JS-PERC Series worth choosing over standard mono panels? PERC (Passivated Emitter and Rear Cell) adds a passivation layer to the rear of a standard monocrystalline cell, reflecting unabsorbed light back through the cell for a second pass. This improves efficiency — especially under diffuse or low-irradiance conditions common in Central Europe. Compared to older mono panels without PERC, the JS-PERC Series generates more energy per square meter of roof area. ### What is the maximum power output of JS Solar JS-PERC panels, and how many do I need for a 10 kWp system? The top variant in the JS-PERC Series reaches 555 Wp per panel. For a 10 kWp system you would need approximately 18-19 modules. The high per-module power rating reduces the total number of panels required, saving roof space and lowering BoS costs related to mounting hardware and DC cabling. ### Do JS-PERC panels perform well during hot summer weather? The JS-PERC Series features a low temperature coefficient, meaning that power output drops less per degree Celsius of cell temperature rise above 25°C compared to standard modules. During hot summer days, this results in proportionally smaller energy losses and more stable system performance throughout the peak generation season. ### Is JS Solar a Tier 1 manufacturer, and is the JS-PERC Series a trustworthy choice? JS Solar, headquartered in Jiangsu, China, and operating since 2004, is not currently listed as a Tier 1 manufacturer by Bloomberg NEF, which reflects a lower level of bankability verification compared to top-tier brands. This is worth considering, particularly for financed projects. The JS-PERC Series does carry standard industry certifications, and the 15-year product warranty combined with a 25-year power guarantee meets the market baseline for residential and small commercial installations. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/f72efe8c38a4c139d4c2c71582cb5b02-c499b2c9722d.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [JA Solar NS-330MH-80](https://comparepv.com/panel/ja-solar-ns-330mh-80) | 330 W | -45 W, lighter, +2.8 pp | | [PolyCrown Solar Tech NS-330MH-80](https://comparepv.com/panel/polycrown-solar-tech-ns-330mh-80) | 330 W | -45 W, lighter, +2.8 pp | | [Gamko New Energy GKA210M340W](https://comparepv.com/panel/gamko-new-energy-gka210m340w) | 340 W | -35 W, +2.7 pp, +5 yr warranty | | [Gamko New Energy GKA210M360W](https://comparepv.com/panel/gamko-new-energy-gka210m360w) | 360 W | Lighter, +2.7 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, +2.7 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 | +25 W, +2.7 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 | +25 W, +2.7 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, +2.7 pp, +5 yr warranty | | [Maxeon SPR-MAX3-400-COM](https://comparepv.com/panel/maxeon-spr-max3-400-com) | 400 W | Cooler, +2.3 pp, +15 yr warranty | | [Maxeon SPR-MAX3-425-R](https://comparepv.com/panel/maxeon-spr-max3-425-r) | 425 W | +50 W, +2.1 pp, +15 yr warranty | | [JS Solar JS350M](https://comparepv.com/panel/js-solar-js350m) | 350 W | -25 W, heavier, -1.4 pp | | [JS Solar JS355M](https://comparepv.com/panel/js-solar-js355m) | 355 W | -20 W, heavier, -1.1 pp | | [JS Solar JS360M120](https://comparepv.com/panel/js-solar-js360m120) | 360 W | -15 W, -0.8 pp | | [JS Solar JS365M](https://comparepv.com/panel/js-solar-js365m) | 365 W | Cooler, heavier, -0.6 pp | | [JS Solar JS370M120](https://comparepv.com/panel/js-solar-js370m120) | 370 W | -0.3 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +135 W, cooler, +4.7 pp | --- Source: https://comparepv.com/panel/js-solar-js375m120 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.