--- title: "Hiwatt Solar HW-M10/108H-400 400W Solar Panel - Specs & Review | ComparePV" description: "Hiwatt Solar HW-M10/108H-400 400W solar panel. Specs: 20.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/hiwatt-solar-hw-m10-108h-400" updated: 2026-09-11 --- # Hiwatt Solar HW-M10/108H-400 Strong in heat, no clear weak spot 954 panels in the segment PERC 400-450 W ## Identity - **Manufacturer:** Hiwatt Solar - **Model:** HW-M10/108H-400 - **Series:** HW-M10/108H(395-415) - **Rated power:** 400 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 400-450 W (954 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 400 W | 410 W | Weak - bottom 9% | | | Module efficiency | 20.50% | 20.60% | Typical | 11,308 | | Power density | 204.8 | 206.2 | Typical | 11,370 | | Temperature coefficient | -0.340 | -0.350 | Strong - top 24% | 8,778 | | Weight (kg) | 20.5 kg | 22.0 kg | Typical | | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.50% | 20.60% | Typical | 11,308 | | Power density | 204.8 | 206.2 | Typical | 11,370 | | Temperature coefficient | -0.340 | -0.350 | Strong - top 24% | 8,778 | | Weight per kWp | 51.2 | 53.0 | Typical | 4,641 | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Strengths - **-0.340 %/°C temperature coefficient** - Top 24% of the PERC 400-450 W segment, against a median of -0.350. - **Best for:** Residential, commercial and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 400 W - **Efficiency:** 20.50 % - **Voltage at Pmax (Vmp):** 31.04 V - **Current at Pmax (Imp):** 12.89 A - **Open-circuit voltage (Voc):** 36.54 V - **Short-circuit current (Isc):** 13.70 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.340 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 43 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 108 ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 20.5 kg - **Area:** 1.95 m2 - **Power density:** 204.8 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **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:** 328 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 11308 of 14005 | | Power density | 11370 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 4641 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Half-Cut + Multi-Busbar (MBB)** - Splitting cells in half reduces current in each half-cell, lowering resistive losses and hotspot risk. MBB design (5+ busbars) shortens the charge-carrier path, reducing internal series resistance and improving energy yield under partial shading conditions. - **PID and LID resistance** - The series claims high resistance to both Potential-Induced Degradation (PID) and Light-Induced Degradation (LID), mitigating the 1–3% first-year power losses typical of older technologies and supporting performance through the full 25-year linear power warranty period. - **M10 wafer, 108 cells – high power density** - The large M10 wafer (182×182 mm) in a 108 half-cut cell layout achieves up to 415 Wp in a standard module footprint, delivering high power density that is particularly valuable on the limited rooftop area typical of Polish residential and small commercial installations. - **PERC technology – enhanced spectral response** - The PERC rear-surface passivation layer reflects near-infrared photons for a second absorption pass, extending effective generation during low-angle irradiance (morning and evening) by an estimated 5–8% compared to standard BSF cells. ## Cons - **Series discontinued (EOL 2023)** - The HW-M10/108H(395-415) series reached end-of-life in 2023 (launched 2021). This means severely limited availability for system expansions, no guarantee of ongoing service support, and difficulty sourcing a matching replacement module in the event of single-panel damage. - **Non-Tier-1 / non-bankable manufacturer** - Hiwatt Solar does not appear on the BNEF Tier-1 module manufacturer list, meaning it has not demonstrated non-recourse project financing by at least six commercial banks. This can be a formal barrier to external project financing or insurance for commercial-scale installations. - **12-year product warranty – below market standard** - The product warranty stands at only 12 years, compared to direct competitor AE Solar AURORA AE MD-108 (matched 415 Wp, 21.28% efficiency), which offers a 30-year product warranty and 30-year performance warranty (≥87.4% after 30 years). The 18-year product warranty gap is a significant factor in long-term ROI analysis. - **PERC – legacy cell technology** - PERC cells degrade at 0.40–0.55%/year, whereas newer TOPCon modules achieve 0.35–0.40%/year. By 2024, TOPCon captured approximately 66% of global manufacturing capacity, displacing PERC as the market standard. Over a 25-year system lifetime, the cumulative energy output difference can reach 2–4%. - **Monofacial only – no bifacial option** - The series offers no bifacial variant (is\_bifacial: false), while direct peer LEDVANCE M395~415P54LM-BF-F3 (up to 415 Wp, 21.25% efficiency) is available in a bifacial version. On installations with high-albedo surfaces (gravel, concrete, snow), bifacial modules can deliver an additional 5–15% annual energy yield. ## About this series The HW-M10/108H(395-415) series features advanced monocrystalline modules that optimize the performance of rooftop installations through the use of **Half-Cut cells and Multi-Busbar (MBB) technology**. Thanks to the compact design based on the M10 wafer, these panels are ideal for limited roof spaces, offering high power density while maintaining aesthetics. A key innovation is the increased resistance to shading, which directly translates into significantly more stable energy production in difficult weather conditions and with partial module obstruction. The use of **PERC technology** allows for more efficient processing of light of various wavelengths, which extends the installation's operating time during the day, especially in the morning and evening. For investors, **high resistance to PID degradation** and the LID phenomenon is crucial, guaranteeing system longevity and a secure return on investment. This solution eliminates typical problems related to power loss due to external factors, which clearly distinguishes the series from standard components available on the market. It is a product dedicated to both demanding home users and the commercial sector looking for a balance between durability and high efficiency. The special frame design **reduces mechanical stress** within the cells, which minimizes the risk of micro-cracks and ensures full reliability over decades of operation in the variable Polish climate. ## Notable figures - Efficiency of 20.5% matches the \*\*PERC 400-450W\*\* median - At 204.8 W/m² power density, roof space requirements are typical for \*\*PERC 400-450W\*\* panels - At -0.34%/°C, hot weather performance is typical for \*\*PERC 400-450W\*\* panels - 20.5 kg weight - 1.5 kg lighter than \*\*PERC 400-450W\*\* median (22.0 kg), reducing installation effort - Ranked #11308 out of 14005 panels for efficiency in the database ## Questions ### Is the Hiwatt Solar HW-M10/108H(395-415) series still available for purchase? The HW-M10/108H(395-415) series has been discontinued and is no longer available as a new product through regular distribution channels. Some remaining units may still be found with select distributors or on the secondary market. If you need a current production alternative from Hiwatt Solar, consider newer series based on the same M10 cell platform, such as the HW-M10/108H(440-460). ### What warranty comes with the Hiwatt Solar HW-M10/108H(395-415) panel? The manufacturer provides a 12-year product warranty covering material and workmanship defects. In addition, a 25-year linear power output warranty guarantees that the module retains a specified performance level over a quarter century. Note that Hiwatt Solar is not classified as a Tier 1 manufacturer, which is worth discussing with your installer or project financier when planning a long-term investment. ### What are the practical benefits of half-cut cells and Multi-Busbar (MBB) technology in the HW-M10/108H panels? Half-cut technology splits each PERC cell into two halves, halving the current in each section and thereby reducing resistive losses while improving shade tolerance. Multi-Busbar (MBB) adds more, thinner conductive paths, shortening the current travel distance and lowering thermal stress on the cells. In practice this means higher energy yield on overcast days and better long-term cell durability over the module's service life. ### What is the maximum power output of the HW-M10/108H series and is it suitable for a small roof? The top variant in this series reaches 415 Wp peak power, built around the M10 wafer format with 108 half-cut PERC cells. The high power density means you can fit more total system capacity on a limited or irregularly shaped roof than with conventional 60-cell modules. This makes it a practical choice for residential installations where every square meter of available roof area counts. ### Can the HW-M10/108H(395-415) panels handle heavy snow and strong winds typical of Central European winters? Yes. The module frame is certified for a snow load of 5,400 Pa and a wind load of 2,400 Pa, meeting the structural requirements for most locations in Poland, including mountainous regions with heavy snowfall. The frame design also reduces internal mechanical stress, minimizing the risk of micro-cracks caused by the thermal cycling common in climates with large seasonal temperature swings. ### Are the Hiwatt Solar HW-M10/108H(395-415) panels bifacial? No. The HW-M10/108H(395-415) is a monofacial module with an opaque backsheet, meaning energy is harvested from the front side only. If bifacial technology — which captures reflected irradiance through a transparent rear glass — is a requirement for your project, you should look at other series that offer that feature. For standard pitched rooftop installations, the monofacial design of this series presents no practical limitation. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/HW-M10108H-395-415-45763177c75d.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 | Cooler, +2.6 pp, +5 yr warranty | | [Just Solar JST-EDMH-(445-465)W-TD (450W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-450w-class) | 450 W | +50 W, +2.6 pp, +5 yr warranty | | [Q-SUN Solar QNN182-HG450-54](https://comparepv.com/panel/qn-solar-pv-limited-qnn182-hg450-54) | 450 W | +50 W, cooler, +2.5 pp | | [Huayao HY440-N108BDD](https://comparepv.com/panel/huayao-hy440-n108bdd) | 450 W | +50 W, +2.5 pp, +5 yr warranty | | [BYD NLBK-27-450](https://comparepv.com/panel/byd-nlbk-27-450) | 450 W | +50 W, +2.5 pp, +5 yr warranty | | [Renesola RS41-450NBG-E3](https://comparepv.com/panel/renesola-rs41-450nbg-e3) | 450 W | +50 W, cooler, +2.5 pp | | [Hiwatt Solar HW-M10/108H-395](https://comparepv.com/panel/hiwatt-solar-hw-m10-108h-395) | 395 W | -0.3 pp | | [Hiwatt Solar HW-M10/108H-405](https://comparepv.com/panel/hiwatt-solar-hw-m10-108h-405) | 405 W | Very close match | | [Hiwatt Solar HW-M10/108H-410](https://comparepv.com/panel/hiwatt-solar-hw-m10-108h-410) | 410 W | +10 W, +0.5 pp | | [Hiwatt Solar HW-M10/108H-415](https://comparepv.com/panel/hiwatt-solar-hw-m10-108h-415) | 415 W | +15 W, +0.7 pp | | [Hiwatt Solar HW-M10/108G-420](https://comparepv.com/panel/hiwatt-solar-hw-m10-108g-420) | 420 W | +20 W, +0.5 pp | | [Hiwatt Solar HW-M10/108G-425](https://comparepv.com/panel/hiwatt-solar-hw-m10-108g-425) | 425 W | +25 W, +0.8 pp | | [Hiwatt Solar HW-M10/108G-430](https://comparepv.com/panel/hiwatt-solar-hw-m10-108g-430) | 430 W | +30 W, +1.0 pp | | [Hiwatt Solar HW-M10/108G-435](https://comparepv.com/panel/hiwatt-solar-hw-m10-108g-435) | 435 W | +35 W, +1.3 pp | | [Hiwatt Solar HW-M10/108G-440](https://comparepv.com/panel/hiwatt-solar-hw-m10-108g-440) | 440 W | +40 W, +1.5 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +110 W, cooler, +4.5 pp | --- Source: https://comparepv.com/panel/hiwatt-solar-hw-m10-108h-400 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.