--- title: "JS Solar JS330M 330W Solar Panel - Specs & Review | ComparePV" description: "JS Solar JS330M 330W solar panel. Specs: 19.60% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/js-solar-js330m" updated: 2026-09-11 --- # JS Solar JS330M Strong in heat, no clear weak spot 3,085 panels in the 230-430 W band, all technologies ## Identity - **Manufacturer:** JS Solar - **Model:** JS330M - **Series:** 120 SERIES - **Rated power:** 330 W - **Cell technology:** Monocrystalline ## How it compares Compared against 230-430 W band, all technologies (3085 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 330 W | 395 W | Weak - bottom 17% | | | Module efficiency | 19.60% | 20.30% | Typical | 12,589 | | Power density | 195.6 | 202.8 | Typical | 12,614 | | Temperature coefficient | -0.280 | -0.350 | Strong - top 5% | 1,309 | | Weight (kg) | 19.0 kg | 21.2 kg | Typical | | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 19.60% | 20.30% | Typical | 12,589 | | Power density | 195.6 | 202.8 | Typical | 12,614 | | Temperature coefficient | -0.280 | -0.350 | Strong - top 5% | 1,309 | | Weight per kWp | 57.6 | 55.7 | Typical | 11,284 | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Strengths - **-0.280 %/°C temperature coefficient** - Top 5% of the 230-430 W band, against a median of -0.350. Ranked 1,309th in the whole database. - **Best for:** Hot roofs and southern climates. ## Specification ### Electrical - **Rated power (Pmax):** 330 W - **Efficiency:** 19.60 % - **Voltage at Pmax (Vmp):** 33.80 V - **Current at Pmax (Imp):** 9.76 A - **Open-circuit voltage (Voc):** 40.50 V - **Short-circuit current (Isc):** 10.24 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.280 %/degC - **Temperature coefficient of Voc:** -0.360 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell count:** 120 ### Physical - **Length:** 1684 mm - **Width:** 1002 mm - **Thickness:** 35 mm - **Weight:** 19.0 kg - **Area:** 1.69 m2 - **Power density:** 195.6 Wp/m2 ### Warranty and degradation - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 80.7 % - **First-year degradation:** 2.50 % - **Annual degradation:** 0.70 % - **Output after 30 years:** 255 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 12589 of 14005 | | Power density | 12614 of 14005 | | Temperature coefficient | 1309 of 14005 | | Weight | 11284 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **MBB + half-cut synergy** - Combining Multi-Busbar technology with half-cut cells reduces series resistance and operating currents, minimizing thermal and internal losses. The result is measurably higher energy yield and better microcracks resilience compared to conventional 60-cell modules with 3–4 busbars. - **Top-variant efficiency matches Tier-1 peers** - The highest-power variant reaches 20.4% efficiency, while Jinko Solar Cheetah HC 60M-V and JA Solar M3 series (both Tier-1) achieve 20.45%. The 0.05 pp gap is negligible in a typical residential installation, meaning the series technically rivals more prominent competitors. - **Dual electrical section — superior shading tolerance** - Splitting the module into two independent electrical halves (top/bottom) ensures that partial shading of one section does not stall the entire panel's output. This is a practical advantage in dense urban rooftop installations with chimneys, vents, or neighboring obstructions. - **PID resistance and harsh-environment durability** - The series claims full resistance to PID (Potential Induced Degradation), salt mist, and ammonia, aligning with IEC 62804 and IEC 62716 certification standards. This is a meaningful advantage for installations in coastal, agricultural, or industrial environments. - **25-year linear power warranty** - The manufacturer provides a 25-year linear power output warranty — identical to peer comparables (Jinko, JA Solar). For end users, this translates into predictable LCOE analysis over the system's full lifetime. ## Cons - **Not listed on BNEF Tier-1** - JS Solar does not appear on the BNEF Tier-1 bankable manufacturers list (Q1 2026), unlike Jinko Solar and JA Solar — two of the three listed peer comparables. The absence of Tier-1 status complicates project financing for commercial-scale installations and may increase insurance costs or reduce residual system value. - **Wide efficiency spread across variants** - The 19.3%–20.4% efficiency range (1.1 pp delta) across five variants means the lowest-power option (325 Wp, ~19.3%) falls well below the peer comparables' peak (20.45%). Installers and investors must explicitly specify the desired power variant to avoid receiving panels with materially lower efficiency than assumed in the project design. - **No bifacial option** - The 120 Series is strictly monofacial, precluding any albedo energy gain. In installations over high-reflectance surfaces (white membrane, gravel, snow), bifacial PERC modules now available in the same 325–345 Wp power class typically deliver 5–15% higher annual yield at no additional BoS cost. ## About this series The JS Solar 120 series is based on advanced half-cut cell architecture, which allows for higher efficiency while maintaining compact module dimensions. The **Multi-Busbar technology** used in them drastically shortens the current flow path, which minimizes internal losses and significantly increases operational stability in the face of potential micro-cracks. A key advantage of this solution is **above-average shading resistance** - thanks to the division of the panel into two independent sections, the system produces energy even when the lower part of the module is in shade, effectively solving design problems in densely built-up residential areas. This series also stands out for its **high performance in low light conditions**, which guarantees stable energy yields in the Polish latitude, especially in the autumn-winter period. The product is intended for demanding prosumers and small business owners, offering **full resistance to the PID effect** and harmful external factors such as ammonia or salt mist. The solid structural frame ensures exceptional resistance to extreme wind pressure and snow load, which distinguishes these panels from budget alternatives in terms of mechanical durability. By choosing the JS Solar 120 series, investors receive equipment that optimally combines technological innovation with long-term operational reliability. ## Notable figures - Module efficiency of 19.6% is 2.2pp below average for \*\*database\*\* panels (median: 21.8%) - At 195.6 W/m², this panel generates 22.5 W/m² less per unit area than \*\*database\*\* median (218.1 W/m²) - At -0.28%/°C, hot weather performance is typical for \*\*database\*\* panels - Weight of 19.0 kg (7.5 kg below \*\*database\*\* median of 26.5 kg) allows easier transport and roof mounting - Ranked #12589 out of 14005 panels for efficiency in the database ## Questions ### Do JS Solar 120 Series panels perform well with partial shading from a chimney or trees? Yes. The 120 SERIES uses half-cut cell architecture that splits the module into two independent electrical sections. When the lower portion of the panel is shaded by a chimney, trees, or a dormer window, the upper section continues generating power at full capacity. This is a concrete advantage on densely built residential estates where full, unobstructed roof exposure is rarely achievable. ### What is the power output warranty for JS Solar 120 Series panels? The manufacturer offers a 25-year linear power output warranty. This means the module retains a defined percentage of its nominal 345 Wp output for a quarter century, protecting the investment against natural cell degradation. Buyers should review the specific degradation thresholds in the official JS Solar warranty documentation before purchasing. ### Do JS Solar 120 Series panels generate power in winter and under overcast skies typical of Central Europe? Yes. The 120 SERIES is specifically engineered for high performance under low irradiance conditions common during Polish autumn and winter. Multi-Busbar technology shortens current pathways within each cell, improving energy conversion even under diffuse, overcast light. Investors in Poland can expect stable annual energy yields throughout the entire year. ### Are JS Solar 120 Series panels resistant to PID, ammonia, and salt mist? Yes. The 120 SERIES features full PID (Potential Induced Degradation) resistance, preventing the significant power loss that can affect modules operating at high system voltages. The modules have also passed ammonia and salt mist resistance testing, making them suitable for agricultural installations as well as coastal environments near the sea. ### What is the maximum power output of a JS Solar 120 Series panel and how many modules do I need for a home system? The peak power of a single 120 SERIES module is 345 Wp. A typical 6 kWp residential prosumer system requires approximately 18 panels, while a 10 kWp system needs around 30 modules. The series targets demanding prosumers and small business owners who prioritize long-term reliability and performance over the lowest upfront purchase price. ### Is JS Solar a Tier 1 manufacturer and how does that affect the security of my investment? JS Solar is not currently listed as a Tier 1 manufacturer by Bloomberg NEF, which is worth noting when assessing financial risk, particularly for projects requiring bank financing. For residential prosumer installations, however, the decisive factors are technical specifications, mechanical robustness — the sturdy frame withstands extreme wind pressure and snow loads — and warranty terms, all of which the 120 SERIES delivers at a competitive level. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/JS158MHC120-350W-1a4cedfc250d.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [JA Solar NS-300MH-72](https://comparepv.com/panel/ja-solar-ns-300mh-72) | 300 W | -30 W, lighter, +3.7 pp | | [PolyCrown Solar Tech NS-300MH-72](https://comparepv.com/panel/polycrown-solar-tech-ns-300mh-72) | 300 W | -30 W, lighter, +3.7 pp | | [Heckert Solar ZEUS 1.2 FullBlack 280W](https://comparepv.com/panel/heckert-solar-zeus-1-2-fullblack-280w) | 280 W | -50 W, +3.7 pp, +5 yr warranty | | [JA Solar NS-330MH-80](https://comparepv.com/panel/ja-solar-ns-330mh-80) | 330 W | Lighter, +3.5 pp | | [PolyCrown Solar Tech NS-330MH-80](https://comparepv.com/panel/polycrown-solar-tech-ns-330mh-80) | 330 W | Lighter, +3.5 pp | | [Gamko New Energy GKA182M285W](https://comparepv.com/panel/gamko-new-energy-gka182m285w) | 285 W | Lighter, +3.4 pp, +5 yr warranty | | [Gamko New Energy GKA182M300W](https://comparepv.com/panel/gamko-new-energy-gka182m300w) | 300 W | -30 W, +3.4 pp, +5 yr warranty | | [Gamko New Energy GKA210M320W](https://comparepv.com/panel/gamko-new-energy-gka210m320w) | 320 W | Lighter, +3.4 pp, +5 yr warranty | | [Gamko New Energy GKA210M340W](https://comparepv.com/panel/gamko-new-energy-gka210m340w) | 340 W | Lighter, +3.4 pp, +5 yr warranty | | [JS Solar JS325M](https://comparepv.com/panel/js-solar-js325m) | 325 W | -0.3 pp | | [JS Solar JS335M](https://comparepv.com/panel/js-solar-js335m) | 335 W | +0.3 pp | | [JS Solar JS340M](https://comparepv.com/panel/js-solar-js340m) | 340 W | +10 W, +0.5 pp | | [JS Solar JS345M](https://comparepv.com/panel/js-solar-js345m) | 345 W | +15 W, +0.8 pp | | [Jetion JT440SYK(B)](https://comparepv.com/panel/jetion-jt440syk-b) | 440 W | +110 W, +3.3 pp, +5 yr warranty | | [Jetion JT435SYk(B)](https://comparepv.com/panel/jetion-jt435syk-b) | 435 W | +105 W, +3.1 pp, +5 yr warranty | | [Maxeon SPR-MAX3-400-COM](https://comparepv.com/panel/maxeon-spr-max3-400-com) | 400 W | +70 W, +3.0 pp, +15 yr warranty | --- Source: https://comparepv.com/panel/js-solar-js330m Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.