--- title: "Hiwatt Solar HW-M6/144H-455 455W Solar Panel - Specs & Review | ComparePV" description: "Hiwatt Solar HW-M6/144H-455 455W solar panel. Specs: 20.80% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/hiwatt-solar-hw-m6-144h-455" updated: 2026-09-11 --- # Hiwatt Solar HW-M6/144H-455 Strong in heat, no clear weak spot 449 panels in the segment PERC 450-500 W ## Identity - **Manufacturer:** Hiwatt Solar - **Model:** HW-M6/144H-455 - **Series:** HW-M6/144H(440-460) - **Rated power:** 455 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 450-500 W (449 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 455 W | 460 W | Typical | | | Module efficiency | 20.80% | 20.82% | Typical | 10,457 | | Power density | 209.3 | 208.5 | Typical | 9,969 | | Temperature coefficient | -0.340 | -0.350 | Strong - top 19% | 8,778 | | Weight (kg) | 24.0 kg | 24.5 kg | Typical | | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.80% | 20.82% | Typical | 10,457 | | Power density | 209.3 | 208.5 | Typical | 9,969 | | Temperature coefficient | -0.340 | -0.350 | Strong - top 19% | 8,778 | | Weight per kWp | 52.7 | 53.1 | Typical | 6,401 | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Strengths - **-0.340 %/°C temperature coefficient** - Top 19% of the PERC 450-500 W segment, against a median of -0.350. - **Best for:** Residential, commercial, shaded-installations and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 455 W - **Efficiency:** 20.80 % - **Voltage at Pmax (Vmp):** 41.20 V - **Current at Pmax (Imp):** 11.06 A - **Open-circuit voltage (Voc):** 49.80 V - **Short-circuit current (Isc):** 11.61 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:** 144 ### Physical - **Length:** 2094 mm - **Width:** 1038 mm - **Thickness:** 35 mm - **Weight:** 24.0 kg - **Area:** 2.17 m2 - **Power density:** 209.3 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:** 373 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 10457 of 14005 | | Power density | 9969 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 6401 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Half-cut cell layout (144 half-cells)** - Splitting cells in half reduces operating currents by ~50%, lowering resistive losses and improving partial-shading tolerance. Compared to full-cell modules, power loss under row-shading events is several times lower because each half-cell substring operates independently. - **Enhanced anti-PID protection** - The series includes dedicated Potential Induced Degradation protection, critical for systems operating above 1,000 V in variable-humidity conditions — typical of Polish rooftop installs in summer. Effective PID resistance prevents irreversible power loss in the string's outer modules. - **440–460 Wp per panel** - The 440–460 Wp power range allows a target system size to be reached with fewer modules, reducing BoS costs (cabling, racking). For a typical 10 kWp residential system, only 22–23 panels are needed versus 28–33 panels with legacy 300–360 Wp modules. - **25-year linear power warranty** - The manufacturer guarantees linear power degradation over 25 years — on par with the mid-tier segment standard. This enables credible LCOE modeling and annual yield forecasts in both bank financing documents and prosumer energy audits. ## Cons - **Efficiency 2–3 pp below peer group** - The maximum 21% module efficiency lags direct peers: Risen RSM96-11-440-460BNDG reaches 23%, SunKean SKT440~460M12-96D4 reaches 23.02%. The ~2 pp gap means peers generate roughly 9–10% more energy from the same roof area, or equivalently save ~0.5 m² per 10 kWp compared to this series. - **PERC technology — higher LID degradation** - P-type PERC cells exhibit ~2% first-year LID and ~0.6–0.8%/year ongoing degradation, versus ~1% / ~0.4%/year for the N-type TOPCon used by Risen and SunKean. After 25 years, PERC modules retain approximately 83–85% of rated power, while TOPCon retains over 90% — a gap of roughly 500–700 kWh/year in lost generation for a 10 kWp system in its final decade of operation. - **Not BNEF Tier-1 bankable** - Hiwatt Solar does not appear on BNEF Tier-1 Bankable Manufacturer lists (verified Q1 2025 through Q1 2026). In practice, this blocks or significantly complicates bank financing for commercial and industrial (C&I) projects, where project agreements and insurers typically require modules from BNEF-listed Tier-1 manufacturers. ## About this series The Hiwatt Solar HW-M6/144H(440-460) series is designed as a **half-cell N-type monocrystalline module**, which allows for stable operation in challenging conditions and maintains high efficiency for a longer period. The use of half-cell splitting results in **lower operating currents**, which effectively reduces losses in connections and helps minimize the risk of localized overheating, especially in partially shaded or dirty conditions. A key feature of this series is **enhanced PID resistance** - which is important in installations operating at higher voltages and in varying humidity conditions. From an investor's perspective, **good performance at high temperatures** is also a significant advantage, leading to better summer performance and more predictable energy production. This is a good choice for rooftop and ground-mounted installations in Poland, where you need high power from a limited area, as well as reliability over many years of operation. ## Notable figures - At 20.8% efficiency, this panel is on par with typical \*\*PERC 450-500W\*\* modules - Power density of 209.3 W/m² matches the \*\*PERC 450-500W\*\* median - Temperature coefficient of -0.34%/°C matches the \*\*PERC 450-500W\*\* median - In the top 75% for efficiency among all PERC panels ## Questions ### What warranty does the Hiwatt Solar HW-M6/144H(440-460) series come with? The manufacturer provides a 12-year product warranty covering material and manufacturing defects, along with a 25-year linear power warranty. This means the module is guaranteed to maintain at least the declared output level according to the producer's degradation curve for a full quarter century. This is a standard period for the premium segment, allowing investors to plan return on investment with an adequate safety margin. ### What does N-type half-cut cell technology in the HW-M6/144H series mean and why does it matter? N-type cells exhibit lower susceptibility to light-induced degradation (LID) and deliver more stable long-term performance compared to standard P-type cells. The half-cut cell layout splits each cell in two, reducing operating currents within the module, lowering resistive losses, and minimizing the risk of hot spots under partial shading. In practice, this results in a higher energy yield and a longer retention of the rated 460 Wp output. ### Is the Hiwatt Solar HW-M6/144H(440-460) series suitable for rooftop installation? Yes, this series is well-suited for pitched and flat rooftops as well as ground-mounted systems. The up-to-460 Wp output allows more energy to be harvested from a limited roof surface, which is relevant for typical residential rooftops. Enhanced PID resistance handles the variable humidity conditions common in many climates, and a favorable temperature coefficient ensures good performance even during hot summer months. ### How many HW-M6/144H panels rated at 460 Wp do I need for a 10 kWp system? At 460 Wp per module, you need approximately 22 panels to reach close to 10 kWp (22 × 460 W = 10,120 Wp). The exact count depends on the selected inverter and its maximum DC input power. The high per-module output also shortens the string count and simplifies the electrical design, which can reduce overall balance-of-system (BoS) and installation costs. ### Are Hiwatt Solar HW-M6/144H panels PID-resistant and what does that mean for my system? The HW-M6/144H series features enhanced PID (Potential Induced Degradation) resistance, protecting against power loss caused by high string voltage combined with moisture. This is especially important in higher-voltage systems and locations with variable humidity. Strong PID resistance guards against the invisible, cumulative power drop that can reach several percent per year in lower-quality modules, keeping your system output predictable over its lifetime. ### How do Hiwatt Solar HW-M6/144H panels perform in high summer temperatures? The HW-M6/144H series delivers favorable performance at elevated temperatures, a key advantage of N-type technology over standard P-type PERC cells. A lower power temperature coefficient means smaller output losses on hot summer days when modules can heat up to 60–70°C. This translates into a higher real energy yield during the peak summer season and more predictable annual production figures for the overall system. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/HW-M6144H-440-460-89fe91a05462.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Cooler, +4.0 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +50 W, cooler, +3.9 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | Cooler, +3.7 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | Cooler, +3.7 pp, +5 yr warranty | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | Cooler, +3.7 pp, +5 yr warranty | | [Gokin GK-3-54HGb-500M](https://comparepv.com/panel/gokin-gk-3-54hgb-500m) | 500 W | Cooler, +3.7 pp, +5 yr warranty | | [Hiwatt Solar HW-M6/144H-440](https://comparepv.com/panel/hiwatt-solar-hw-m6-144h-440) | 440 W | -15 W, -0.7 pp | | [Hiwatt Solar HW-M6/144H-445](https://comparepv.com/panel/hiwatt-solar-hw-m6-144h-445) | 445 W | -10 W, -0.4 pp | | [Hiwatt Solar HW-M6/144H-450](https://comparepv.com/panel/hiwatt-solar-hw-m6-144h-450) | 450 W | Very close match | | [Hiwatt Solar HW-M6/144H-460](https://comparepv.com/panel/hiwatt-solar-hw-m6-144h-460) | 460 W | Very close match | | [Gamko New Energy GKA120N-PRO-590W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-590w) | 590 W | +135 W, +3.0 pp, +5 yr warranty | | [Gamko New Energy GKA120N-PRO-585W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-585w) | 585 W | +130 W, +2.8 pp, +5 yr warranty | | [Bisol BGO 580](https://comparepv.com/panel/bisol-bgo-580) | 580 W | +125 W, cooler, +2.7 pp | | [Gamko New Energy GKA120N-PRO-580W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-580w) | 580 W | +125 W, +2.6 pp, +5 yr warranty | --- Source: https://comparepv.com/panel/hiwatt-solar-hw-m6-144h-455 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.