--- title: "JS Solar JS210MC120-390 390W Solar Panel - Specs & Review | ComparePV" description: "JS Solar JS210MC120-390 390W solar panel. Specs: 20.30% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/js-solar-js210mc120-390" updated: 2026-09-11 --- # JS Solar JS210MC120-390 Middle of its segment, short guarantee 6,208 panels in the 290-490 W band, all technologies ## Identity - **Manufacturer:** JS Solar - **Model:** JS210MC120-390 - **Series:** JS210MC120 - **Rated power:** 390 W - **Cell technology:** Monocrystalline ## How it compares Compared against 290-490 W band, all technologies (6208 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 390 W | 430 W | Weak - bottom 20% | | | Module efficiency | 20.30% | 21.26% | Typical | 11,769 | | Power density | 202.9 | 212.5 | Typical | 11,787 | | Temperature coefficient | -0.350 | -0.300 | Weak - bottom 24% | 10,419 | | Weight (kg) | 21.0 kg | 22.3 kg | Typical | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 19% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.30% | 21.26% | Typical | 11,769 | | Power density | 202.9 | 212.5 | Typical | 11,787 | | Temperature coefficient | -0.350 | -0.300 | Weak - bottom 24% | 10,419 | | Weight per kWp | 53.8 | 53.3 | Typical | 7,897 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 19% | 9,798 | ### Watch out for - **25 year performance warranty** - Bottom 19% of the 290-490 W band, against a median of 30 yrs. - **-0.350 %/°C temperature coefficient** - Bottom 24% of the 290-490 W band, against a median of -0.300. - **Best for:** Commercial and shaded-installations. - **Not ideal for:** Owners who want a long output guarantee and hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 390 W - **Efficiency:** 20.30 % - **Voltage at Pmax (Vmp):** 33.80 V - **Current at Pmax (Imp):** 11.54 A - **Open-circuit voltage (Voc):** 40.80 V - **Short-circuit current (Isc):** 12.14 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.350 %/degC - **Temperature coefficient of Voc:** -0.270 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell count:** 120 ### Physical - **Length:** 1754 mm - **Width:** 1096 mm - **Thickness:** 30 mm - **Weight:** 21.0 kg - **Area:** 1.92 m2 - **Power density:** 202.9 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:** 320 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 11769 of 14005 | | Power density | 11787 of 14005 | | Temperature coefficient | 10419 of 14005 | | Weight | 7897 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **210 mm cells + half-cut MBB** - 120 half-cut cells (60 full M10 210 mm wafers) reduce resistive losses by ~50% vs. full-cell modules, improving partial-shade tolerance. Multi-busbar (MBB) interconnection shortens electron paths, cuts optical losses, and limits micro-crack propagation over the module's lifespan. - **Up to 21.1% efficiency — above peer group** - The 405 Wp top variant achieves 21.1% module efficiency at ~1.92 m², clearly outperforming direct peers: EGing PV STAR Series (20.74%) and VSUN VSUN405-108BMH-DG (20.74%). Higher power density per m² is advantageous on constrained roof surfaces. - **PID-free rated** - The module carries a PID-free rating, a critical specification for high-voltage string installations (Voc >1000 V) typical of commercial rooftop and utility-scale systems where induced voltage degradation poses the greatest risk. - **Low temperature coefficient of power** - A temperature coefficient of approximately –0.35%/°C, typical for half-cut PERC, limits summer production losses and helps stabilize annual energy yield under the variable irradiance conditions of Central European climates. - **25-year linear power warranty** - JS Solar provides a 25-year linear power output warranty, matching the commercial-segment market standard and forming the basis for bankable long-term ROI and LCOE modeling in project finance documents. ## Cons - **Series discontinued** - The JS210MC120 is marked discontinued (launched 2021). New module availability is severely limited, and warranty service plus spare parts (junction boxes, seals, bypass diodes) may be difficult to source within a 10–25 year operational horizon. - **Not BNEF Tier 1 / bankable** - JS Solar does not appear on the BNEF Tier 1 bankable manufacturers list (verified against Q2 and Q4 2025 lists). For commercially financed projects, this can block project financing or increase insurance premiums, and it raises long-term counterparty risk on warranty claims. - **No bifacial option** - Two of three peer comparables offer bifacial modules: Goldi Solar GS10-M108-BF and VSUN VSUN405-108BMH-DG (dual glass). Bifacial modules typically generate 5–15% additional yield from ground albedo, translating to a materially better LCOE on ground-mount installations at comparable BoS cost. - **PERC technology outpaced by TOPCon/HJT (2026)** - Half-cut PERC from 2021 now competes against N-type TOPCon modules achieving 22–23% efficiency and HJT technology. Specifying this series for a new installation in 2026 results in lower annual yield per m² and a worse LCOE compared to currently available next-generation modules, often available in the same price bracket. ## About this series The JS Solar JS210MC120 series consists of advanced photovoltaic modules based on large-format 210 mm silicon cells, which set a new standard for efficiency in commercial and industrial installations. Thanks to the use of **half-cut cell technology**, these panels effectively minimize energy losses resulting from internal resistance, which directly translates to stable power production even in challenging lighting conditions or partial shading. The design utilizing **multi-busbar connections** ensures optimal electron flow and significantly increases the module's resistance to micro-cracks, guaranteeing system longevity in the variable Polish climate. This solution meets the needs of investors seeking **maximum power density** on limited roof space, allowing for a real reduction in the costs of mounting structures and cabling. Compared to the competition, the JS210MC120 stands out with its **high resistance to potential-induced degradation (PID)** and a low temperature coefficient, making it an ideal choice for large solar farms and modern business buildings. The innovative non-destructive cell cutting method eliminates the risk of mechanical damage, ensuring failure-free operation and a quick return on investment for the most demanding users in the renewable energy sector. ## Notable figures - Efficiency of 20.3% is 1.5pp below the \*\*database\*\* median (21.8%) - 202.9 W/m² power density is 15.2 W/m² below \*\*database\*\* median (218.1 W/m²) - requires larger installation area - -0.35%/°C temperature coefficient - 0.05pp worse than \*\*database\*\* median (-0.30%/°C), expect higher hot weather losses - At 21.0 kg, this panel is 5.5 kg lighter than \*\*database\*\* median (26.5 kg) - easier handling during installation - Ranked #11769 out of 14005 panels for efficiency in the database ## Questions ### Is the JS Solar JS210MC120 series still available for purchase? The JS Solar JS210MC120 series has been discontinued and is no longer in active distribution. If you need similar specifications — 210 mm half-cut cells, multi-busbar technology, and around 405 Wp — contact distributors about remaining stock or consider newer JS Solar series and comparable alternatives from other manufacturers. ### What does half-cut cell technology do in the JS210MC120 panels, and does it really make a difference? Half-cut technology splits each silicon cell into two smaller halves, reducing internal resistance and resistive losses. In practice, this delivers higher energy yield under partial shading — from a chimney, rooftop antenna, or dormer — and makes the module significantly more resistant to microcracks that can gradually reduce output in standard full-cell modules over years of operation. ### What power output warranty does the JS Solar JS210MC120 carry? JS Solar provides a 25-year linear power output warranty, guaranteeing that the module retains a specified percentage of its original 405 Wp rating over a quarter century, following the degradation curve in the datasheet. Note that JS Solar is not listed as a Tier 1 bankable manufacturer, which may be relevant when assessing long-term investment risk or securing project financing. ### Do the JS210MC120 panels perform well in winter and in Poland's variable climate? The JS210MC120 features a low temperature coefficient, meaning it loses relatively little power on hot days, while cool Polish spring and autumn conditions can occasionally push output above the STC-rated 405 Wp (STC is measured at a laboratory-standard 25 °C). Its high PID resistance also protects against gradual efficiency loss caused by voltage-induced degradation in humid and variable weather conditions. ### What types of installations are the JS Solar JS210MC120 panels best suited for? The JS210MC120 series was designed for commercial and industrial applications: factory rooftops, warehouses, and large office buildings. The large-format 210 mm cells combined with multi-busbar interconnection maximize power density per square meter, directly reducing the number of modules required, shortening cable runs, and lowering overall BoS costs for the entire system. ### How does the JS210MC120 differ from bifacial panels, and when does the monofacial design make sense? The JS210MC120 is a monofacial module that captures sunlight only from the front surface. Bifacial panels additionally harvest reflected irradiance through the rear side, potentially boosting annual yield by several percentage points under favorable albedo conditions. For installations on dark bituminous rooftops or sites with low ground reflectivity, a monofacial panel like the JS210MC120 was often the more cost-effective and mechanically simpler choice. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/JS210MC120-405W-12971c45aa59.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Luxor Solar LX-440M/182-108+GG](https://comparepv.com/panel/luxor-solar-lx-440m-182-108-gg) | 440 W | +50 W, cooler, +2.8 pp | | [Gamko New Energy GKA210M340W](https://comparepv.com/panel/gamko-new-energy-gka210m340w) | 340 W | -50 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 | Lighter, +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 | Lighter, +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 | | [Jetion JT440SYK(B)](https://comparepv.com/panel/jetion-jt440syk-b) | 440 W | +50 W, cooler, +2.6 pp | | [JS Solar JS210MC120-395](https://comparepv.com/panel/js-solar-js210mc120-395) | 395 W | Very close match | | [JS Solar JS210MC120-400](https://comparepv.com/panel/js-solar-js210mc120-400) | 400 W | +10 W, +0.5 pp | | [JS Solar JS210MC120-405](https://comparepv.com/panel/js-solar-js210mc120-405) | 405 W | +15 W, +0.8 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +120 W, cooler, +4.7 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +105 W, cooler, +4.5 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +115 W, cooler, +4.4 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +100 W, cooler, +4.2 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +110 W, cooler, +4.2 pp | --- Source: https://comparepv.com/panel/js-solar-js210mc120-390 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.