--- title: "JS Solar JS390M 390W Solar Panel - Specs & Review | ComparePV" description: "JS Solar JS390M 390W solar panel. Specs: 19.39% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/js-solar-js390m" updated: 2026-09-11 --- # JS Solar JS390M Strong in heat, no clear weak spot 579 panels in the segment PERC 350-400 W ## Identity - **Manufacturer:** JS Solar - **Model:** JS390M - **Series:** 144 SERIES - **Rated power:** 390 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) | 390 W | 380 W | Typical | | | Module efficiency | 19.39% | 19.90% | Typical | 12,768 | | Power density | 193.8 | 199.0 | Typical | 12,738 | | Temperature coefficient | -0.280 | -0.350 | Strong - top 2% | 1,309 | | Weight (kg) | 22.5 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 | 19.39% | 19.90% | Typical | 12,768 | | Power density | 193.8 | 199.0 | Typical | 12,738 | | Temperature coefficient | -0.280 | -0.350 | Strong - top 2% | 1,309 | | Weight per kWp | 57.7 | 55.8 | Typical | 11,364 | | 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. - **Best for:** Commercial, utility-scale and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 390 W - **Efficiency:** 19.39 % - **Voltage at Pmax (Vmp):** 41.11 V - **Current at Pmax (Imp):** 9.49 A - **Open-circuit voltage (Voc):** 49.30 V - **Short-circuit current (Isc):** 10.12 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:** 144 ### Physical - **Length:** 2008 mm - **Width:** 1002 mm - **Thickness:** 35 mm - **Weight:** 22.5 kg - **Area:** 2.01 m2 - **Power density:** 193.8 Wp/m2 ### Warranty and degradation - **Product warranty:** 10 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:** 301 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 12768 of 14005 | | Power density | 12738 of 14005 | | Temperature coefficient | 1309 of 14005 | | Weight | 11364 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Half-Cut + MBB: lower losses and shade resilience** - Splitting PERC cells into two independent half-cut sections reduces internal module resistance by approximately 25-30% compared to full-cell designs, while the multi-busbar (MBB) layout distributes mechanical stress and limits microcrack propagation. In practice, this translates to higher partial-shade tolerance and more stable output on rooftops with obstructions. - **LID/LeTID protection in PERC technology** - The series employs cell stabilization processes that eliminate light-induced degradation (LID) and thermally activated degradation (LeTID), which are inherent failure modes in conventional PERC modules. The manufacturer warrants predictable power retention under a 25-year linear power warranty, which is relevant for LCOE calculations in the Central European climate. - **Temperature coefficient better than standard PERC** - The JS Half-Cut Mono(144) datasheet listed in the ENF Solar database specifies a Pmax temperature coefficient of -0.28%/°C, compared to the typical PERC range of -0.35% to -0.40%/°C. The ~0.07-0.12 pp/°C advantage translates into measurably higher energy yield during summer peaks above 35°C ambient. - **18 power variants across 340-455 Wp** - A broad configuration range — from 340 Wp (Poly variants) to 455 Wp (Mono variants) across 18 SKUs — allowed precise matching to different string-inverter and MPPT topologies without power optimizers, reducing BoS costs in utility and large commercial installations. ## Cons - **Discontinued series** - JS Solar 144 SERIES has discontinued status. The lack of ongoing production creates significant operational risk: a mechanically damaged module cannot be replaced with an identical unit, which may require restringing or adding power optimizers to maintain MPPT compatibility. For commercial installations, this directly affects payback period modeling and O&M budgets. - **Max efficiency 20.9% vs. peer comparables 22.56-22.80%** - Competing 455 Wp modules (LEDVANCE M435~455N54LB-SF-F7: 22.77%; Sunlike Solar SKT420~455M10-108D6: 22.80%; Solitek SOLRIF D: 22.56%) outperform by ~1.7-2.0 percentage points, meaning roughly 9-10% more roof area is required for the same nameplate capacity. The gap indicates peers use N-type technology (TOPCon or HJT), which surpassed 66% of global production capacity in 2024. - **Manufacturer absent from BNEF Tier-1 Bankable list** - JS Solar (Yixing JS Solar Co., Ltd.) does not appear on the BNEF Tier-1 bankable module manufacturers list (verified against Q4 2025 BNEF results). Absence from the bankable list significantly complicates or prevents project-finance debt underwriting by independent commercial banks for installations above 10 MW, effectively restricting the series to self-funded or smaller commercial projects. - **25-year power retention 80.7% — below Tier-1 standard** - The JS Half-Cut Mono(144) datasheet guarantees 80.7% of Pmax remaining after 25 years. Leading Tier-1 manufacturers (JA Solar JAM72S30, JinkoSolar Tiger Pro) warrant 84.8-87.4% Pmax over the same horizon. A 4-7 pp gap equates to measurably lower annual energy output in year 25 — a meaningful variable in project-level LCOE sensitivity analysis. ## About this series The JS Solar 144 SERIES solar panel series utilizes an advanced design based on **Half-Cut cell technology**, which directly translates into higher module efficiency and a significant reduction in energy losses resulting from internal resistance. By dividing the cells into two independent sections, these panels demonstrate **exceptional shading resistance**, allowing for stable power production even in difficult installation conditions where traditional modules lose efficiency. An innovative approach to busbar placement in MBB technology minimizes the risk of micro-cracks, which guarantees long-term reliability and mechanical stability of the entire installation. Products from this line are an ideal solution for **large-scale photovoltaic farms** and large commercial facilities, where optimizing LCOE costs and maximizing yields per square meter of area are of key importance. This series stands out from the competition with an excellent temperature coefficient of power, which ensures the panels maintain high productivity even during summer heat. By choosing the JS Solar 144 SERIES, investors gain **advanced protection against LID and LeTID degradation**, which translates into a predictable and secure return on investment in the Polish climate. ## Notable figures - Efficiency of 19.4% matches the \*\*PERC 0-400W\*\* median - At 193.8 W/m² power density, roof space requirements are typical for \*\*PERC 0-400W\*\* panels - Temperature coefficient of -0.28%/°C vs median -0.36%/°C means ~3% less power loss at 65°C - Weight of 22.5 kg is 2.0 kg above \*\*PERC 0-400W\*\* median (20.5 kg) - verify structural support - Ranked #12768 out of 14005 panels for efficiency in the database ## Questions ### Are JS Solar 144 SERIES panels still available for purchase? The JS Solar 144 SERIES has been discontinued and is no longer actively offered by the manufacturer. Availability through distributors is limited to remaining warehouse stock. If you are planning a new installation, we recommend considering current JS Solar modules or panels from another manufacturer with active production support and full supply continuity. ### What warranty comes with JS Solar 144 SERIES panels? JS Solar provides a 15-year product warranty and a 25-year linear power output warranty (performance warranty) for the 144 SERIES. The power warranty guarantees the module retains a specified minimum percentage of rated output over 25 years. Keep in mind that enforcing warranty claims against a Chinese manufacturer for a discontinued product line may be more challenging than with actively produced modules. ### What advantages does half-cut PERC technology offer in the JS Solar 144 SERIES compared to standard cells? Half-cut PERC cells are split in half, reducing the current each cell carries and lowering resistive losses, which improves overall module efficiency. The panel is divided into two independent electrical sections, so partial shading from a chimney or antenna only reduces output from half the module. The PERC layer also reflects uncaptured photons back into the cell, further boosting energy yield. ### What is the maximum power output of the JS Solar 144 SERIES and which installations is it best suited for? The flagship variant of the series reaches a maximum power output of 455 Wp. This is typical for large 144-cell modules designed primarily for utility-scale solar farms and large commercial installations where LCOE optimization and high energy yield per square meter are critical. For typical residential rooftop systems (3–10 kWp), lighter and more compact modules may be a better fit. ### Do JS Solar 144 SERIES panels lose efficiency during hot summer temperatures? All PV panels lose some output at elevated temperatures, but the JS Solar 144 SERIES features a favorable temperature coefficient of power, meaning losses on a hot day are lower than with older non-half-cut modules. The series also includes protection against LID and LeTID degradation, which is particularly relevant in climates with pronounced seasonal temperature swings. ### JS Solar is not a Tier 1 manufacturer — does this affect the quality of the JS Solar 144 SERIES panels? The Tier 1 classification primarily reflects a manufacturer's financial standing and bankability, not product quality directly. The JS Solar 144 SERIES incorporates half-cut PERC and MBB technology used by leading manufacturers. However, the lack of Tier 1 status poses higher risk for institutional investors in project financing and insurance, and may complicate warranty service, especially for a discontinued product line. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/JS158MHC144-415W-8a0d35a9ef13.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, +3.7 pp, +5 yr warranty | | [Gamko New Energy GKA210M340W](https://comparepv.com/panel/gamko-new-energy-gka210m340w) | 340 W | -50 W, lighter, +3.6 pp | | [Gamko New Energy GKA210M360W](https://comparepv.com/panel/gamko-new-energy-gka210m360w) | 360 W | Lighter, +3.6 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, +3.6 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, +3.6 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, +3.6 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, +3.6 pp, +5 yr warranty | | [Jetion JT440SYK(B)](https://comparepv.com/panel/jetion-jt440syk-b) | 440 W | +50 W, +3.5 pp, +5 yr warranty | | [JS Solar JS340P](https://comparepv.com/panel/js-solar-js340p) | 340 W | -50 W, -2.5 pp | | [JS Solar JS345P](https://comparepv.com/panel/js-solar-js345p) | 345 W | -45 W, -2.3 pp | | [JS Solar JS350P](https://comparepv.com/panel/js-solar-js350p) | 350 W | -40 W, -2.0 pp | | [JS Solar JS355P](https://comparepv.com/panel/js-solar-js355p) | 355 W | -35 W, -1.8 pp | | [JS Solar JS360P](https://comparepv.com/panel/js-solar-js360p) | 360 W | -30 W, -1.5 pp | | [JS Solar JS395M](https://comparepv.com/panel/js-solar-js395m) | 395 W | +0.2 pp | | [JS Solar JS400M](https://comparepv.com/panel/js-solar-js400m) | 400 W | +10 W, +0.5 pp | | [JS Solar JS405M](https://comparepv.com/panel/js-solar-js405m) | 405 W | +15 W, +0.7 pp | | [Maxeon SPR-MAX7-475](https://comparepv.com/panel/maxeon-spr-max7-475) | 475 W | +85 W, +4.6 pp, +15 yr warranty | --- Source: https://comparepv.com/panel/js-solar-js390m Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.