--- title: "Jolywood JW-HD108N-415 415W Solar Panel - Specs & Review | ComparePV" description: "Jolywood JW-HD108N-415 415W solar panel. Specs: 21.25% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/jolywood-jw-hd108n-415" updated: 2026-09-11 --- # Jolywood JW-HD108N-415 Middle of its segment, heavy for its output 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** Jolywood - **Model:** JW-HD108N-415 - **Series:** NIWA Pro Series - **Rated power:** 415 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) | 415 W | 435 W | Weak - bottom 9% | | | Module efficiency | 21.25% | 22.00% | Weak - bottom 8% | 8,904 | | Power density | 212.5 | 220.2 | Weak - bottom 10% | 8,791 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight (kg) | 24.5 kg | 22.0 kg | Weak - bottom 6% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.25% | 22.00% | Weak - bottom 8% | 8,904 | | Power density | 212.5 | 220.2 | Weak - bottom 10% | 8,791 | | Temperature coefficient | -0.300 | -0.290 | Typical | 6,093 | | Weight per kWp | 59.0 | 51.4 | Weak - bottom 6% | 11,992 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **59.0 kg per kWp** - Bottom 6% of the TOPCon 400-450 W segment, against a median of 51.4. Ranked 11,992nd in the whole database. - **21.25% module efficiency** - Bottom 8% of the TOPCon 400-450 W segment, against a median of 22.00%. Ranked 8,904th in the whole database. - **212.5 watts per square metre** - Bottom 10% of the TOPCon 400-450 W segment, against a median of 220.2. - **Best for:** Residential, commercial and hot-climate. - **Not ideal for:** Weight-limited structures, tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 415 W - **Efficiency:** 21.25 % - **Voltage at Pmax (Vmp):** 31.70 V - **Current at Pmax (Imp):** 13.10 A - **Open-circuit voltage (Voc):** 37.70 V - **Short-circuit current (Isc):** 13.91 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:** 0.045 %/degC - **NOCT:** 42 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:** 24.5 kg - **Area:** 1.95 m2 - **Power density:** 212.5 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 363 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 8904 of 14005 | | Power density | 8791 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 11992 of 14005 | | Warranty | 21 of 14005 | ## Pros - **J-TOPCon 2.0 – zero LID and LeTID** - Second-generation N-type cells fully eliminate light-induced degradation (LID) and light & elevated temperature induced degradation (LeTID), which can cost P-type PERC modules 2-3% of rated power in the first years of operation. Jolywood, a TOPCon pioneer since the NIWA series launch in 2020, has been recognized by PVEL in N-type TOPCon reliability testing. - **30-year linear power warranty** - The manufacturer guarantees ≥87.4% Pmax after 30 years of operation (linear degradation curve), backed by a 25-year product warranty. Tier-1 peers in the same 415-440 Wp class — Seraphim Nebula and KDM Kingdom Solar — offer a 25-year power warranty, making Jolywood NIWA Pro's coverage 5 years longer. - **Bifacial design – rear-side energy gain** - Glass-glass bifacial construction enables an additional energy yield of 10-30% over monofacial modules, depending on ground albedo (light gravel, white TPO membrane, snow cover). This directly reduces the LCOE of ground-mount and high-albedo rooftop installations. - **BNEF Tier-1 bankability since 2008** - Jolywood appears on the current BNEF Tier-1 bankable manufacturer list (methodology updated March 18, 2026), enabling debt-financed project acceptance by leading financial institutions without additional collateral. The manufacturer has been active since 2008 with a declared production capacity of ~10 GW/year. - **Low temperature coefficient of -0.30%/°C** - The temperature coefficient of Pmax is -0.30%/°C per the official datasheet (JW-HD108N). At a cell temperature of 65°C (Δ40°C above STC), power loss reaches approximately 12%, compared to 14-16% for typical P-type PERC modules — a tangible advantage during hot summer days above 30°C. ## Cons - **Efficiency below segment leader** - The top-variant (440 Wp) maximum efficiency is 22.53%, while Luxor Solar ECO LINE N-TYPE TOPCon Non-Reflect achieves 22.86% at the same power rating. The 0.33 percentage-point gap translates to approximately 6.5 W less per square meter — a meaningful difference for installations with critically constrained roof area. ## About this series The Jolywood NIWA Pro series redefines efficiency standards thanks to the use of innovative second-generation **N-type TOPCon** cells. This solution directly eliminates light-induced degradation (LID), which translates to significantly higher long-term power stability compared to traditional P-type modules. Thanks to the unique J-TOPCon 2.0 cell structure, these modules are characterized by **excellent efficiency in low-light conditions**, which is crucial in the Polish climate, especially during autumn-winter periods. Investors appreciate this series for its **very low temperature coefficient**, allowing high energy yields to be maintained even during hot days when standard panels lose efficiency. The NIWA Pro series was designed for demanding rooftop installations and professional photovoltaic farms, where maximizing power density per square meter is essential. The use of modern SMBB technology further increases light absorption and the reliability of internal connections. It is an ideal choice for those looking for **exceptional durability and a faster return on investment** by maximizing energy self-consumption. By choosing these modules, you gain the certainty of stable system operation in all weather conditions, which places the NIWA Pro series at the forefront of technological solutions available on the Polish market. ## Notable figures - Efficiency of 21.2% is 0.8pp below the \*\*TOPCon 400-450W\*\* median (22.0%) - At 212.5 W/m², this panel generates 7.7 W/m² less per unit area than \*\*TOPCon 400-450W\*\* median (220.2 W/m²) - At -0.30%/°C, hot weather performance is typical for \*\*TOPCon 400-450W\*\* panels - At 24.5 kg (2.5 kg above \*\*TOPCon 400-450W\*\* median of 22.0 kg), requires checking roof load capacity - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces ## Questions ### What warranties come with Jolywood NIWA Pro panels and what exactly do they cover? The Jolywood NIWA Pro Series includes a 25-year product warranty covering manufacturing defects and a 30-year linear power output warranty. The power warranty caps first-year degradation at 1%, followed by a maximum of 0.4% per year, guaranteeing at least 87.4% of rated power at year 30. As a Tier 1 manufacturer, Jolywood's financial stability reinforces the credibility of these long-term warranty commitments. ### Are Jolywood NIWA Pro panels suitable for Central European climate conditions and do they perform well on overcast winter days? Yes, the NIWA Pro Series is well-suited for climates with significant seasonal variation. The second-generation N-type J-TOPCon 2.0 cell structure delivers excellent weak-light response during overcast autumn and winter conditions. The zero-LID design ensures stable power output throughout the module's lifetime, while the low temperature coefficient of -0.30%/°C minimizes losses on hot summer days, maximizing annual energy yield. ### How does the TOPCon technology in the NIWA Pro Series compare to standard PERC panels? TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell technology that fully eliminates LID (light-induced degradation) — a known weakness of P-type PERC modules. The NIWA Pro Series achieves module efficiency above 22.5%, surpassing most PERC alternatives. N-type TOPCon cells also provide superior weak-light response and a lower temperature coefficient, resulting in higher annual energy yield under real-world operating conditions. ### What does bifacial mean for the NIWA Pro panel and does it matter for a standard rooftop installation? Bifacial means the NIWA Pro module harvests sunlight through both the front and rear glass surfaces. With a reflective substrate — such as light-colored roofing membrane or gravel — the rear side can contribute an additional 5–15% of energy output. On a standard dark roof the bifacial gain is lower, but the dual-glass construction significantly improves moisture resistance and mechanical durability, supporting a service life well beyond 30 years. ### What is the peak output of the Jolywood NIWA Pro panel and how many modules are needed for a 10 kW system? The NIWA Pro Series reaches a peak output of up to 440 Wp with module efficiency exceeding 22.5%. A 10 kW system therefore requires approximately 23 modules. The SMBB (Super Multi Busbar) technology combined with the J-TOPCon 2.0 cell structure maximizes power density per square meter, making this series an efficient choice for space-constrained rooftop installations or utility-scale PV farms targeting maximum LCOE reduction. ### Are Jolywood NIWA Pro panels compatible with standard string inverters available on the European market? Yes, NIWA Pro modules are compatible with all major inverter brands available in Europe, including Fronius, SMA, Huawei, Solis, and SolarEdge. The panels produce voltages and currents typical of premium N-type modules, so the installer should verify the inverter's MPPT input voltage range and design string configurations accordingly. Commissioning by a certified PV installer is recommended to ensure optimal system performance. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/202306071138449941-b1678c9effc4.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Just Solar JST-EDMH-(445-465)W-TD (465W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-465w-class) | 465 W | +50 W, lighter, +2.6 pp | | [Luxor Solar LX-465M/182R-96+ GG](https://comparepv.com/panel/luxor-lx-465m-182r-96-gg) | 465 W | +50 W, cooler, +2.6 pp | | [AIKO AIKO-A460-MAH54Mb](https://comparepv.com/panel/aiko-shenzhen-aiko-digital-energy-technology-co-ltd-aiko-a460-mah54mb-1) | 460 W | +45 W, lighter, +2.4 pp | | [Luxor Solar LX-465M/182R188-108+ GG](https://comparepv.com/panel/luxor-solar-lx-465m-182r188-108-gg) | 465 W | +50 W, cooler, +2.4 pp | | [Just Solar JST-EDMH-(445-465)W-TD (460W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-460w-class) | 460 W | +45 W, lighter, +2.3 pp | | [Luxor Solar LX-460M/182R-96+ GG](https://comparepv.com/panel/luxor-lx-460m-182r-96-gg) | 460 W | +45 W, cooler, +2.3 pp | | [Philadelphia Solar PS-MNB108(HCBF)-460W](https://comparepv.com/panel/philadelphia-solar-ps-mnb108-hcbf-460w) | 460 W | +45 W, lighter, +2.3 pp | | [JA Solar JAT54S40-460/LR](https://comparepv.com/panel/ja-solar-jat54s40-460-lr) | 460 W | +45 W, lighter, +2.2 pp | | [Jolywood JW-HD108N-420](https://comparepv.com/panel/jolywood-jw-hd108n-420) | 420 W | +0.3 pp | | [Jolywood JW-HD108N-425](https://comparepv.com/panel/jolywood-jw-hd108n-425) | 425 W | +10 W, +0.5 pp | | [Jolywood JW-HD108N-430](https://comparepv.com/panel/jolywood-jw-hd108n-430) | 430 W | +15 W, +0.8 pp | | [Jolywood JW-HD108N-435](https://comparepv.com/panel/jolywood-jw-hd108n-435) | 435 W | +20 W, +1.0 pp | | [Jolywood JW-HD108N-440](https://comparepv.com/panel/jolywood-jw-hd108n-440) | 440 W | +25 W, +1.3 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +95 W, cooler, +3.8 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +80 W, cooler, +3.6 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +90 W, cooler, +3.4 pp | --- Source: https://comparepv.com/panel/jolywood-jw-hd108n-415 Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.