--- title: "Hiwatt Solar HW-M10/108G-440 440W Solar Panel - Specs & Review | ComparePV" description: "Hiwatt Solar HW-M10/108G-440 440W solar panel. Specs: 22.02% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/hiwatt-solar-hw-m10-108g-440" updated: 2026-09-11 --- # Hiwatt Solar HW-M10/108G-440 Space saver, weak in heat 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** Hiwatt Solar - **Model:** HW-M10/108G-440 - **Series:** HW-M10/108G (420-440) - **Rated power:** 440 W - **Cell technology:** TOPCon ## How it compares Compared against segment TOPCon 400-450 W (1218 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 440 W | 435 W | Typical | | | Module efficiency | 22.02% | 22.00% | Typical | 6,329 | | Power density | 225.3 | 220.2 | Strong - top 8% | 4,099 | | Temperature coefficient | -0.340 | -0.290 | Weak - bottom 5% | 8,778 | | Weight (kg) | 20.5 kg | 22.0 kg | Strong - top 8% | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 7% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.02% | 22.00% | Typical | 6,329 | | Power density | 225.3 | 220.2 | Strong - top 8% | 4,099 | | Temperature coefficient | -0.340 | -0.290 | Weak - bottom 5% | 8,778 | | Weight per kWp | 46.6 | 51.4 | Strong - top 8% | 1,235 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 7% | 9,798 | ### Strengths - **225.3 watts per square metre** - Top 8% of the TOPCon 400-450 W segment, against a median of 220.2. Ranked 4,099th in the whole database. - **46.6 kg per kWp** - Top 8% of the TOPCon 400-450 W segment, against a median of 51.4. Ranked 1,235th in the whole database. ### Watch out for - **-0.340 %/°C temperature coefficient** - Bottom 5% of the TOPCon 400-450 W segment, against a median of -0.290. Ranked 8,778th in the whole database. - **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 and shaded-installations. - **Not ideal for:** Hot climates and owners who want a long output guarantee. ## Specification ### Electrical - **Rated power (Pmax):** 440 W - **Efficiency:** 22.02 % - **Voltage at Pmax (Vmp):** 32.99 V - **Current at Pmax (Imp):** 13.34 A - **Open-circuit voltage (Voc):** 39.57 V - **Short-circuit current (Isc):** 13.80 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:** TOPCon - **Cell count:** 108 ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 20.5 kg - **Area:** 1.95 m2 - **Power density:** 225.3 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 85.3 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.55 % - **Output after 30 years:** 361 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 6329 of 14005 | | Power density | 4099 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 1235 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **N-type TOPCon with half-cut cells and MBB** - N-type cells carry virtually zero LID/LeTID risk and a better temperature coefficient than legacy PERC (~-0.30%/°C vs. ~-0.35%/°C), meaningfully boosting summer and high-temperature yield. The half-cut architecture combined with multi-busbar (MBB) interconnects reduces resistive losses and improves shade tolerance. - **Multi-stage EL inspection as standard QC** - The manufacturer declares multi-step electroluminescence (EL) inspection during production, limiting the risk of micro-cracks and hidden factory defects reaching the installer — particularly relevant when sourcing from less widely recognized brands where production-line QC is difficult to verify independently. - **25-year linear power warranty** - The series carries a 25-year power output warranty, consistent with the N-type TOPCon segment standard and backed by the inherently low degradation of N-type cells. This provides a predictable energy production profile across the full system lifetime. - **M10 (182 mm) wafer format, 108 half-cut cells** - Built on the M10 (182 mm) wafer format — now the dominant industry standard — the module delivers solid power density (up to 22.02% efficiency) and broad BoS compatibility: racking systems, MPPT inverters, and junction boxes all widely sized for this format. ## Cons - **Not BNEF Tier-1 (non-bankable)** - Hiwatt Solar does not appear on the BloombergNEF Tier-1 module manufacturer list (confirmed in the provided context: tier\_1\_bankable: false). For commercially financed projects, the absence of bankable status can result in technical due diligence rejection or higher cost of capital. The limitation is largely irrelevant for residential prosumer installs but effectively excludes the series from large-scale tenders and project finance. - **Module efficiency below peer comparables** - Maximum module efficiency is 22.02%, while directly comparable series in the same power range achieve: Luxor ECO LINE N-TYPE TOPCon — 22.86%, Seraphim Nebula — 22.53%, KDM Kingdom Solar — 22.50%. A gap of 0.5–0.84 percentage points translates to measurably lower output per unit of roof area, a material disadvantage on space-constrained installations. - **2021 vintage — newer generation already in production** - The HW-M10/108G series launched in 2021. Hiwatt Solar has since introduced a successor line, the HW-M10/108H (440–460 W), featuring higher rated power and cell efficiency exceeding 23% (per ENF Solar datasheet data). Buyers should anticipate a shrinking variant selection and a potentially shorter active product support window for this older series. ## About this series The Hiwatt Solar HW-M10/108G (420-440) series is designed for high efficiency in real rooftop and ground-mounted conditions, even when partial shading, reduced sunlight, or significant temperature fluctuations occur. The use of **N-type cells** and **half-cut technology** helps minimize losses and stabilize the module's performance, resulting in more predictable annual energy production. A key feature of this series is **MBB and dense inter-cell connections**, which improve current flow and support the long-term durability of the structure, which is important in installations exposed to wind and snow loads. For installers and investors, **multiple EL inspections for quality control** are also important, which reduces the risk of hidden defects and microcracks. This is a good choice for single-family homes, businesses, and prosumer projects, where reliability, high efficiency, and long-term operation are important. ## Notable figures - At 22.0% efficiency, this panel is on par with typical \*\*TOPCon 400-450W\*\* modules - 225.3 W/m² power density - 5.1 W/m² more than \*\*TOPCon 400-450W\*\* median (220.2 W/m²), more power per roof area - At -0.34%/°C, loses 0.05pp more power per degree than \*\*TOPCon 400-450W\*\* median (-0.29%/°C) - At 20.5 kg, this panel is 1.5 kg lighter than \*\*TOPCon 400-450W\*\* median (22.0 kg) - easier handling during installation - In the top 45% for efficiency among all TOPCon panels ## Questions ### What is the warranty on Hiwatt Solar HW-M10/108G (420-440) panels? The HW-M10/108G series comes with a 12-year product warranty covering material and workmanship defects, plus a 25-year linear power output warranty. This means the manufacturer guarantees a defined minimum performance level for a full quarter century, which aligns with the typical operational lifespan of a residential or commercial PV system and provides solid long-term protection for your investment. ### How does the Hiwatt Solar HW-M10/108G perform on cloudy days or in low-light conditions? The N-type TOPCon cell technology used in the HW-M10/108G delivers noticeably better low-light performance compared to older PERC modules. TOPCon cells exhibit near-zero Light-Induced Degradation (LID) and a lower temperature coefficient of around -0.30%/°C. The half-cut cell design further reduces resistive losses, meaning the module starts generating power earlier in the morning and continues later in the evening — a real advantage in temperate climates with frequent cloud cover. ### Is the HW-M10/108G suitable for a roof with partial shading from a chimney or dormers? Yes, and this is one of the series' practical strengths. The half-cut cell layout splits each cell into two independent halves, so shading on one portion of the module does not fully shut down the other half. Combined with MBB (Multi-Busbar) interconnects and dense cell connections that shorten current paths, the HW-M10/108G handles partial shading significantly better than conventional full-cell modules — making it a sensible choice for complex roof geometries. ### What is the peak power output of the Hiwatt Solar HW-M10/108G and what does that mean in practice? The top variant in the series reaches 440 Wp under standard test conditions. A typical 10-panel residential installation would yield 4.4 kWp total, enough to cover a large share of an average household's annual electricity consumption. Higher per-panel wattage also means fewer panels are needed to hit a target system size, reducing racking, wiring, and labor costs while making better use of limited roof area. ### How does TOPCon technology in the HW-M10/108G compare to older PERC panels? TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell architecture with an additional passivation layer that minimizes electron recombination. Compared to PERC, this translates to higher module efficiency, a lower temperature coefficient (approx. -0.30%/°C vs. -0.35 to -0.45%/°C for PERC), and virtually zero LID. In practice, the HW-M10/108G produces more energy during hot summer days and retains more of its rated output over the first years of operation than a comparable PERC module. ### Is the Hiwatt Solar HW-M10/108G a bifacial or monofacial panel? The HW-M10/108G series is monofacial, meaning energy is harvested from the front face only. For standard pitched-roof installations where the rear of the module is covered by mounting hardware or roofing material, this is perfectly adequate. Bifacial variants within the Hiwatt Solar lineup are available in separate series and are best suited for ground-mount systems with reflective surfaces beneath the array. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/HW-M10108G-420-440-8efe31d4b014.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +50 W, cooler, +2.5 pp | | [Suntech STP-NT11/48QGSF-490](https://comparepv.com/panel/suntech-stp-nt11-48qgsf-490) | 490 W | +50 W, cooler, +2.5 pp | | [JA Solar JAT54S40-485/LR](https://comparepv.com/panel/ja-solar-jat54s40-485-lr) | 485 W | Cooler, +2.3 pp, +5 yr warranty | | [AIKO AIKO-A485-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a485-mce54mw) | 485 W | Cooler, +2.3 pp, +5 yr warranty | | [AIKO AIKO-A485-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a485-mah54mw) | 485 W | Cooler, +2.3 pp, +5 yr warranty | | [Gokin GK-5-54HG-485M](https://comparepv.com/panel/gokin-gk-5-54hg-485m) | 485 W | Cooler, +2.3 pp, +5 yr warranty | | [Heckert Solar ZEUS 3.0+ 108 485WP](https://comparepv.com/panel/heckert-solar-zeus-3-0-108-485wp) | 485 W | Cooler, +2.3 pp, +5 yr warranty | | [Hiwatt Solar HW-M10/108H-395](https://comparepv.com/panel/hiwatt-solar-hw-m10-108h-395) | 395 W | -45 W, -1.8 pp | | [Hiwatt Solar HW-M10/108H-400](https://comparepv.com/panel/hiwatt-solar-hw-m10-108h-400) | 400 W | -40 W, -1.5 pp | | [Hiwatt Solar HW-M10/108H-405](https://comparepv.com/panel/hiwatt-solar-hw-m10-108h-405) | 405 W | -35 W, -1.3 pp | | [Hiwatt Solar HW-M10/108H-410](https://comparepv.com/panel/hiwatt-solar-hw-m10-108h-410) | 410 W | -30 W, -1.0 pp | | [Hiwatt Solar HW-M10/108H-415](https://comparepv.com/panel/hiwatt-solar-hw-m10-108h-415) | 415 W | -25 W, -0.8 pp | | [Hiwatt Solar HW-M10/108G-420](https://comparepv.com/panel/hiwatt-solar-hw-m10-108g-420) | 420 W | -20 W, -1.0 pp | | [Hiwatt Solar HW-M10/108G-425](https://comparepv.com/panel/hiwatt-solar-hw-m10-108g-425) | 425 W | -15 W, -0.8 pp | | [Hiwatt Solar HW-M10/108G-430](https://comparepv.com/panel/hiwatt-solar-hw-m10-108g-430) | 430 W | -10 W, -0.5 pp | | [Hiwatt Solar HW-M10/108G-435](https://comparepv.com/panel/hiwatt-solar-hw-m10-108g-435) | 435 W | -0.2 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +70 W, cooler, +3.0 pp | --- Source: https://comparepv.com/panel/hiwatt-solar-hw-m10-108g-440 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.