--- title: "JS Solar JS435N108FB 435W Solar Panel - Specs & Review | ComparePV" description: "JS Solar JS435N108FB 435W solar panel. Specs: 22.28% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/js-solar-js435n108fb" updated: 2026-09-11 --- # JS Solar JS435N108FB Light for its output, short guarantee 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** JS Solar - **Model:** JS435N108FB - **Series:** JS-N-TOPCon SERIES - **Rated power:** 435 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 400-450 W (1218 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 435 W | 435 W | Typical | | | Module efficiency | 22.28% | 22.00% | Strong - top 24% | 5,403 | | Power density | 222.8 | 220.2 | Strong - top 17% | 5,150 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight (kg) | 19.0 kg | 22.0 kg | Strong - top 2% | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 7% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.28% | 22.00% | Strong - top 24% | 5,403 | | Power density | 222.8 | 220.2 | Strong - top 17% | 5,150 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight per kWp | 43.7 | 51.4 | Strong - top 2% | 326 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 7% | 9,798 | ### Strengths - **43.7 kg per kWp** - Top 2% of the TOPCon 400-450 W segment, against a median of 51.4. Ranked 326th in the whole database. - **222.8 watts per square metre** - Top 17% of the TOPCon 400-450 W segment, against a median of 220.2. - **22.28% module efficiency** - Top 24% of the TOPCon 400-450 W segment, against a median of 22.00%. ### Watch out for - **25 year performance warranty** - Bottom 7% of the TOPCon 400-450 W segment, against a median of 30 yrs. Ranked 9,798th in the whole database. - **Best for:** Residential, commercial, utility-scale and hot-climate. - **Not ideal for:** Owners who want a long output guarantee. ## Specification ### Electrical - **Rated power (Pmax):** 435 W - **Efficiency:** 22.28 % - **Voltage at Pmax (Vmp):** 32.50 V - **Current at Pmax (Imp):** 13.39 A - **Open-circuit voltage (Voc):** 39.10 V - **Short-circuit current (Isc):** 14.07 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:** TOPCon - **Cell count:** 108 - **Bifacial:** yes ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 19.0 kg - **Area:** 1.95 m2 - **Power density:** 222.8 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:** 357 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 5403 of 14005 | | Power density | 5150 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 326 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **22.45% efficiency at the segment ceiling** - The peak efficiency of 22.45% in the 580 Wp variant matches the best peer comparables in this class: Emmvee Titanium Duo (22.45%) and EGing PV STAR Pro (22.45%). The series therefore sits at the absolute top of available TOPCon modules in this power range, with no efficiency compromise relative to similarly priced competitors. - **N-type TOPCon: lower degradation and better hot-weather output** - N-type TOPCon cells achieve a temperature coefficient of approximately -0.30%/°C, compared to ~-0.45%/°C for standard P-type PERC modules. At a typical module temperature of 55°C, this translates to roughly 7.5% higher yield versus PERC. The TOPCon architecture also eliminates the LID (Light-Induced Degradation) effect, resulting in a slower degradation curve over the full 25-year service life. - **Bifacial design – additional yield from albedo** - The bifacial cell structure generates 5–25% additional energy from the rear surface depending on ground albedo (concrete ~25%, grass ~20%, dark rooftop ~5%). In ground-mount and flat white-roof installations, bifaciality meaningfully lowers LCOE without increasing module count. - **8 power variants (420–580 Wp) within one series** - The 420–580 Wp range with eight variants covers both smaller residential rooftop installations (geometric roof constraints) and commercial MW-scale projects. It enables a single-supplier strategy and uniform string configuration without mixing electrical parameters from different series. - **25-year linear power output warranty** - The manufacturer provides a 25-year linear power warranty, consistent with the standard offered by peer comparables in the segment (ZNShine ZXM7-UHLD144, Emmvee Titanium Duo, EGing PV STAR Pro). A linear — rather than step-down — guarantee provides better yield predictability for DCF financial models used by project lenders. ## Cons - **Not BNEF Tier-1 bankable (Q1 2026)** - JS Solar does not appear on the BNEF Tier-1 bankable manufacturers list as of Q1 2026, whereas peer comparable ZNShine Solar holds Tier-1 status. The absence of Tier-1 classification may prevent module acceptance in projects financed under non-recourse project finance structures by European banks, which typically require Tier-1 status as a procurement approval condition. - **Limited track record and warranty execution risk** - The manufacturer has been operating since 2011 (~15 years of market presence) and lacks a verifiable history of large-scale utility reference projects in Europe. In the context of a 25-year power warranty, the absence of Tier-1 status combined with a relatively short track record represents higher warranty claim execution risk than established manufacturers within the global top-10 rankings. ## About this series JS-N-TOPCon SERIES are advanced photovoltaic modules based on N-type cell technology, which sets new efficiency standards in the Polish RES sector. The use of **innovative TOPCon architecture** allows for minimizing energy losses resulting from electron recombination, which translates into realistically higher yields from every square meter of the installation. This series addresses the key problem of light-induced degradation (LID), offering investors long-term power stability and a faster return on investment. The panels are characterized by **exceptional efficiency in low light conditions**, which is crucial in the Polish climate zone during cloudy days. **An excellent temperature coefficient** ensures that the modules maintain high productivity even during summer heat, outperforming standard P-type solutions. This product is dedicated to demanding residential users and commercial projects where maximizing self-consumption and component durability are essential. By choosing these modules, you gain **increased resistance to aging effects** and the certainty that the system will maintain optimal parameters for decades. It is a solid alternative to the competition, combining the latest technological thought with high mechanical resistance to harsh weather conditions. ## Notable figures - At 22.3% efficiency, this panel is on par with typical \*\*TOPCon 400-450W\*\* modules - At 222.8 W/m² power density, roof space requirements are typical for \*\*TOPCon 400-450W\*\* panels - Temperature coefficient of -0.30%/°C matches the \*\*TOPCon 400-450W\*\* median - At 19.0 kg, this panel is 3.0 kg lighter than \*\*TOPCon 400-450W\*\* median (22.0 kg) - easier handling during installation - #5403 for efficiency, #6093 for temperature performance out of 14005 panels ## Questions ### Do JS Solar JS-N-TOPCon Series panels perform well on the cloudy days typical of the Polish climate? Yes, the JS-N-TOPCon Series is optimized for low-irradiance conditions thanks to N-type TOPCon cell technology, which minimizes electron recombination losses. In Poland's climate, where overcast skies are common for a significant part of the year, these modules generate measurably more energy compared to standard P-type PERC panels. This advantage is especially meaningful during autumn and winter months, when every kilowatt-hour directly impacts the return on investment. ### What is TOPCon technology and why choose it over standard PERC? TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell technology in which an ultra-thin silicon oxide layer reduces electron recombination losses. In practice, this translates to higher module efficiency, a better temperature coefficient (approximately -0.30%/°C versus -0.40%/°C for PERC), and near-zero light-induced degradation (LID). The JS-N-TOPCon Series is the right choice for installations focused on maximizing energy yield over many decades, both in residential prosumer and commercial applications. ### The JS-N-TOPCon Series panels are bifacial — how much additional energy does the bifacial design provide? Yes, the JS-N-TOPCon Series features bifacial modules that generate power from both the front and rear surfaces. The rear side captures light reflected from the ground (e.g., light-colored gravel, white roofing membrane, or snow), potentially increasing total energy yield by 5–20% depending on installation conditions. The bifacial gain is most pronounced in ground-mounted and free-standing systems with a suitably high surface albedo. ### What does the power output warranty on the JS Solar JS-N-TOPCon Series cover and for how long? JS Solar provides a 25-year linear power output warranty on the JS-N-TOPCon Series — one of the longer warranty periods available on the market. For a full quarter century, each module is guaranteed to retain a defined percentage of its rated power (up to 580 Wp), with a very low annual degradation rate characteristic of N-type cells. A separate product warranty covering materials and workmanship also applies; confirm the exact terms with your local distributor. ### Do JS-N-TOPCon Series panels lose more power during summer heat than conventional modules? No — quite the opposite. N-type TOPCon cells feature a more favorable temperature coefficient (approximately -0.30%/°C) compared to P-type PERC modules (-0.40%/°C). This means that for every degree Celsius the cell temperature rises above 25°C, JS-N-TOPCon modules lose less power than older-generation technology. For installations in sunny locations during summer, this translates into measurably higher real-world energy yields. ### Is JS Solar a reliable manufacturer — is it worth investing in this brand despite the lack of Tier 1 status? JS Solar, headquartered in Yixing, Jiangsu, China, specializes in N-type TOPCon cells and modules. However, it is not currently listed as a Bloomberg Tier 1 manufacturer, meaning its global reference portfolio is smaller than market leaders. Before purchasing, verify the module certifications (IEC 61215, IEC 61730), confirm the warranty fulfillment process through a local distributor, and check the availability of after-sales service in your country. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/03b977855af1a3bbb60a8be6f73c3b52-compressed-ecd96b3065ee.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [JA Solar JAT54S40-485/LR](https://comparepv.com/panel/ja-solar-jat54s40-485-lr) | 485 W | +50 W, +2.0 pp, +5 yr warranty | | [AIKO AIKO-A485-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a485-mce54mw) | 485 W | +50 W, +2.0 pp, +5 yr warranty | | [AIKO AIKO-A485-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a485-mah54mw) | 485 W | +50 W, +2.0 pp, +5 yr warranty | | [Gokin GK-5-54HG-485M](https://comparepv.com/panel/gokin-gk-5-54hg-485m) | 485 W | +50 W, +2.0 pp, +5 yr warranty | | [Heckert Solar ZEUS 3.0+ 108 485WP](https://comparepv.com/panel/heckert-solar-zeus-3-0-108-485wp) | 485 W | +50 W, heavier, +2.0 pp | | [JS Solar JS182MHC108-390](https://comparepv.com/panel/js-solar-js182mhc108-390) | 390 W | -45 W, hotter, -2.3 pp | | [JS Solar JS182MHC108-395](https://comparepv.com/panel/js-solar-js182mhc108-395) | 395 W | -40 W, hotter, -2.1 pp | | [JS Solar JS182MHC108-400](https://comparepv.com/panel/js-solar-js182mhc108-400) | 400 W | -35 W, hotter, -1.8 pp | | [JS Solar JS405M108](https://comparepv.com/panel/js-solar-js405m108) | 405 W | -30 W, -0.6 pp | | [JS Solar JS182MHC108-405](https://comparepv.com/panel/js-solar-js182mhc108-405) | 405 W | -30 W, hotter, -1.6 pp | | [JS Solar JS410M108HBC](https://comparepv.com/panel/js-solar-js410m108hbc) | 410 W | -25 W, heavier, -1.3 pp | | [JS Solar JS182MHC108-410](https://comparepv.com/panel/js-solar-js182mhc108-410) | 410 W | -25 W, hotter, -1.3 pp | | [JS Solar JS415M108HBC](https://comparepv.com/panel/js-solar-js415m108hbc) | 415 W | -20 W, heavier, -1.0 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +75 W, cooler, +2.7 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +60 W, +2.5 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +70 W, cooler, +2.4 pp | --- Source: https://comparepv.com/panel/js-solar-js435n108fb Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.