--- title: "JS Solar JS350M 350W Solar Panel - Specs & Review | ComparePV" description: "JS Solar JS350M 350W solar panel. Specs: 18.90% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/js-solar-js350m" updated: 2026-09-11 --- # JS Solar JS350M Strong in heat, modest efficiency 579 panels in the segment PERC 350-400 W ## Identity - **Manufacturer:** JS Solar - **Model:** JS350M - **Series:** 120 Series - **Rated power:** 350 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) | 350 W | 380 W | Weak - bottom 2% | | | Module efficiency | 18.90% | 19.90% | Weak - bottom 12% | 12,996 | | Power density | 189.2 | 199.0 | Weak - bottom 13% | 12,974 | | Temperature coefficient | -0.280 | -0.350 | Strong - top 2% | 1,309 | | Weight (kg) | 21.0 kg | 21.4 kg | Typical | | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 18.90% | 19.90% | Weak - bottom 12% | 12,996 | | Power density | 189.2 | 199.0 | Weak - bottom 13% | 12,974 | | Temperature coefficient | -0.280 | -0.350 | Strong - top 2% | 1,309 | | Weight per kWp | 60.0 | 55.8 | Typical | 12,365 | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Strengths - **-0.280 %/°C temperature coefficient** - Top 2% of the PERC 350-400 W segment, against a median of -0.350. Ranked 1,309th in the whole database. ### Watch out for - **18.90% module efficiency** - Bottom 12% of the PERC 350-400 W segment, against a median of 19.90%. - **189.2 watts per square metre** - Bottom 13% of the PERC 350-400 W segment, against a median of 199.0. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 350 W - **Efficiency:** 18.90 % - **Voltage at Pmax (Vmp):** 33.30 V - **Current at Pmax (Imp):** 10.52 A - **Open-circuit voltage (Voc):** 40.20 V - **Short-circuit current (Isc):** 11.28 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 technology:** PERC - **Cell count:** 120 ### Physical - **Length:** 1765 mm - **Width:** 1048 mm - **Thickness:** 40 mm - **Weight:** 21.0 kg - **Area:** 1.85 m2 - **Power density:** 189.2 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **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:** 270 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 12996 of 14005 | | Power density | 12974 of 14005 | | Temperature coefficient | 1309 of 14005 | | Weight | 12365 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Half-cut + multi-busbar: lower shading losses** - The 120-cell half-cut layout halves each cell, cutting working current and resistive losses by ~50% versus standard full cells. Multi-busbar (MBB) interconnection shortens the current path and reduces microfracture-induced degradation — a meaningful advantage for modules subject to thermal cycling and handling stress. - **Certified PID resistance** - The series carries verified resistance to Potential Induced Degradation (PID), critical for string systems operating above 600 V DC. Maintaining PID immunity protects real annual energy yield over the full lifetime of the installation. - **Peak efficiency 20.3% — top tier among PERC peers** - The highest-power variant delivers 20.3% module efficiency, outperforming Boviet Solar VEGA Series (20.0%) and Boviet GAMMA Series™ (20.2%) among the listed peer comparables. Only ENCOR EC (20.59%) scores higher in this peer group, placing JS Solar 120 Series in the upper tercile of the comparable PERC segment. - **6 power variants (350–375 Wp)** - Six power bins within a single series (350 / 355 / 360 / 365 / 370 / 375 Wp) allow precise capacity matching to constrained roof areas or inverter MPPT input ranges without switching to a different product family. - **25-year linear power warranty** - All variants carry a 25-year linear performance warranty — in line with the mid-market segment standard. A linear degradation schedule eliminates the risk of abrupt threshold breaches mid-lifetime, providing predictable yield modeling over the full BoS lifetime. ## Cons - **Not Tier-1 / not BNEF bankable** - JS Solar does not appear on the BloombergNEF Tier-1 module manufacturer list (as of Q1 2026), unlike peer comparable Boviet Solar, which holds BNEF Tier-1 status in Q1 2026. The absence of bankability complicates non-recourse project financing and may reduce residual asset value in PPA assignments or refinancing scenarios. - **Product warranty as low as 10 years on entry variants** - Lower-tier variants in this series carry only a 10-year product warranty, versus the 12–15 year market standard for mid-market modules. Opting for the shorter-warranty SKU increases out-of-pocket replacement risk once coverage lapses, particularly for installations with 20+ year expected BoS lifetimes. - **PERC — aging cell generation** - The series uses P-type PERC cells, a technology widely commercialized before 2019. Competing N-type TOPCon modules show lower LID/LeTID degradation rates and a better temperature coefficient (typically –0.30%/°C vs. –0.35%/°C for PERC), which can translate to 2–4% higher cumulative energy yield over a 25-year service life. ## About this series The JS Solar 120 Series consists of modules with a **120 half-cut cell** configuration, designed to operate reliably even under less-than-ideal rooftop conditions. The cell division minimizes losses due to partial shading and helps maintain higher energy production throughout the day, which significantly improves self-consumption in residential and small business installations. A key feature of this series is the combination of **multi-busbar technology** with a refined connection architecture, which improves current collection and resistance to micro-cracks that may occur during transport or installation. Furthermore, the modules have **proven resistance to PID**, which is particularly important in installations operating for years at high string voltages. The use of tempered, low-iron glass and a robust construction also supports **high mechanical resistance** to environmental loads. The JS Solar 120 Series is suitable for residential rooftops, small and medium-sized commercial installations, and retrofits, where compatibility with popular inverters and easy adaptation to limited space are important. ## Notable figures - Efficiency of 18.9% is 0.6pp below the \*\*PERC 0-400W\*\* median (19.4%) - Power density of 189.2 W/m² is 5.2 W/m² below \*\*PERC 0-400W\*\* median (194.4 W/m²) - needs more roof space - At -0.28%/°C (vs median -0.36%/°C), loses ~3% less power in hot conditions - Ranked #12996 out of 14005 panels for efficiency in the database ## Questions ### What warranty does the JS Solar 120 Series come with? The JS Solar 120 Series carries a 15-year product warranty covering manufacturing defects and a 25-year linear power output warranty. The power warranty guarantees a specified minimum efficiency level for the full 25-year operational period. Before purchasing, review the exact annual degradation thresholds in the datasheet, as they directly affect the long-term return on investment over the system's lifecycle. ### Is the JS Solar 120 Series suitable for a roof with partial shading? Yes. The 120 Series uses a 120 half-cut PERC cell layout that splits each cell into two independent current-generating units. Shading on one section of the module does not eliminate output from the rest. In typical rooftop installations with chimneys, dormers, or antennas, this results in noticeably higher daily energy yields and better self-consumption compared to conventional full-size cell modules. ### What does multi-busbar technology mean in the JS Solar 120 Series and why does it matter? Multi-busbar (MBB) refers to a higher number of thin current-collecting busbars on each PERC cell surface. More busbars shorten the electron path, improving current collection and reducing resistive losses. An additional benefit is greater resistance to microcracks that can form during transport or installation. In practice, this translates to more stable energy output throughout the entire operational life of the PV system. ### Are JS Solar 120 Series panels resistant to PID and why does it matter? Yes, the JS Solar 120 Series features confirmed PID (Potential Induced Degradation) resistance — protection against power loss caused by high string voltage combined with moisture and heat. This is especially important in systems with long strings and high DC voltage, common in residential and commercial setups. PID resistance helps the modules maintain output close to rated power throughout the 25-year power warranty period. ### What inverters are compatible with the 375 Wp JS Solar 120 Series panels? The 120 Series modules rated at 375 Wp have electrical parameters compatible with widely used string and hybrid inverters, including SMA, Fronius, Huawei, SolarEdge, and Growatt. Before finalizing string sizing, always verify the module's Voc against the inverter's maximum input voltage and confirm the MPPT voltage range. This broad inverter compatibility makes the series a practical choice for retrofitting existing PV installations. ### Are JS Solar 120 Series panels bifacial or monofacial? The JS Solar 120 Series is a monofacial module based on PERC cell technology. Unlike bifacial panels, it does not harvest additional reflected light from the rear side, but this simplifies mounting structure selection and system cost estimation. For standard pitched roofs and flat-roof commercial installations where available area is the main constraint, it remains a proven and straightforward choice that does not require elevated racking with specific ground clearance. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/JS166MHC120-375W-ae4091d33f1e.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [JA Solar NS-300MH-72](https://comparepv.com/panel/ja-solar-ns-300mh-72) | 300 W | -50 W, lighter, +4.4 pp | | [PolyCrown Solar Tech NS-300MH-72](https://comparepv.com/panel/polycrown-solar-tech-ns-300mh-72) | 300 W | -50 W, lighter, +4.4 pp | | [JA Solar NS-330MH-80](https://comparepv.com/panel/ja-solar-ns-330mh-80) | 330 W | -20 W, lighter, +4.2 pp | | [PolyCrown Solar Tech NS-330MH-80](https://comparepv.com/panel/polycrown-solar-tech-ns-330mh-80) | 330 W | -20 W, lighter, +4.2 pp | | [Gamko New Energy GKA182M300W](https://comparepv.com/panel/gamko-new-energy-gka182m300w) | 300 W | -50 W, +4.1 pp, +5 yr warranty | | [Gamko New Energy GKA210M320W](https://comparepv.com/panel/gamko-new-energy-gka210m320w) | 320 W | Lighter, +4.1 pp, +5 yr warranty | | [Gamko New Energy GKA210M340W](https://comparepv.com/panel/gamko-new-energy-gka210m340w) | 340 W | Lighter, +4.1 pp, +5 yr warranty | | [Gamko New Energy GKA210M360W](https://comparepv.com/panel/gamko-new-energy-gka210m360w) | 360 W | Lighter, +4.1 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, +4.1 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 | +50 W, +4.1 pp, +5 yr warranty | | [JS Solar JS355M](https://comparepv.com/panel/js-solar-js355m) | 355 W | +0.3 pp | | [JS Solar JS360M120](https://comparepv.com/panel/js-solar-js360m120) | 360 W | Hotter, lighter, +0.6 pp | | [JS Solar JS365M](https://comparepv.com/panel/js-solar-js365m) | 365 W | +15 W, +0.8 pp | | [JS Solar JS370M120](https://comparepv.com/panel/js-solar-js370m120) | 370 W | +20 W, lighter, +1.1 pp | | [JS Solar JS375M120](https://comparepv.com/panel/js-solar-js375m120) | 375 W | +25 W, lighter, +1.4 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +160 W, +6.1 pp, +5 yr warranty | --- Source: https://comparepv.com/panel/js-solar-js350m Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.