--- title: "Hiwatt Solar HW-M372H-400 400W Solar Panel - Specs & Review | ComparePV" description: "Hiwatt Solar HW-M372H-400 400W solar panel. Specs: 20.30% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/hiwatt-solar-hw-m372h-400" updated: 2026-09-11 --- # Hiwatt Solar HW-M372H-400 Strong in heat, modest efficiency 954 panels in the segment PERC 400-450 W ## Identity - **Manufacturer:** Hiwatt Solar - **Model:** HW-M372H-400 - **Series:** HW-M372H(380-400) - **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 | 20.30% | 20.60% | Weak - bottom 23% | 11,769 | | Power density | 202.9 | 206.2 | Weak - bottom 23% | 11,779 | | Temperature coefficient | -0.340 | -0.350 | Strong - top 24% | 8,778 | | Weight (kg) | 21.5 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 | 20.30% | 20.60% | Weak - bottom 23% | 11,769 | | Power density | 202.9 | 206.2 | Weak - bottom 23% | 11,779 | | Temperature coefficient | -0.340 | -0.350 | Strong - top 24% | 8,778 | | Weight per kWp | 53.8 | 53.0 | Typical | 7,774 | | 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. ### Watch out for - **20.30% module efficiency** - Bottom 23% of the PERC 400-450 W segment, against a median of 20.60%. - **202.9 watts per square metre** - Bottom 23% of the PERC 400-450 W segment, against a median of 206.2. - **Best for:** Residential, commercial, shaded-installations and hot-climate. - **Not ideal for:** Tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 400 W - **Efficiency:** 20.30 % - **Voltage at Pmax (Vmp):** 40.21 V - **Current at Pmax (Imp):** 9.95 A - **Open-circuit voltage (Voc):** 49.58 V - **Short-circuit current (Isc):** 10.36 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:** 72 ### Physical - **Length:** 1979 mm - **Width:** 996 mm - **Thickness:** 35 mm - **Weight:** 21.5 kg - **Area:** 1.97 m2 - **Power density:** 202.9 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 | 11769 of 14005 | | Power density | 11779 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 7774 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Half-cut cell architecture** - Splitting cells reduces series resistance and hot-spot losses. In practice this means better performance under partial shading and soiling — common issues in rooftop installations — compared with full-cell PERC modules in the same power class. - **Up to 20.3% module efficiency** - Peak module efficiency of 20.3% clearly outperforms the directly comparable MWG Mono peer (19.32%), placing the series in the upper quartile of the 380–400 Wp segment. On roof space-constrained systems, fewer modules are needed to reach target system power. - **Enhanced anti-PID protection** - The manufacturer guarantees resistance to Potential Induced Degradation through tightly controlled production processes and materials. This is critical for grounded or high system-voltage installations where PID can silently erode string output over years. - **Favorable temperature coefficient** - A Pmax temperature coefficient of -0.34%/°C beats the typical PERC benchmark (~-0.37%/°C). At a module temperature of 70°C — common in summer peak-production hours — this translates to approximately 0.7 percentage points higher yield than thermally inferior PERC counterparts. - **5 power variants (380–400 Wp)** - Five distinct power configurations allow precise string matching without heavily detuned BoS configurations. The series remains in active production, simplifying module replacement during servicing over a multi-decade system lifetime. ## Cons - **Not BNEF Tier-1 / non-bankable** - Hiwatt Solar does not appear on the BNEF bankable Tier-1 module manufacturer list (Q1 2026). Standard bankability criteria require at least six >10 MW projects financed by independent commercial lenders — absence of this status increases due-diligence requirements and can disqualify the series from projects requiring manufacturer financial guarantees. - **12-year product warranty** - The workmanship warranty stands at 12 years, while current-generation N-type TOPCon modules from Tier-1 manufacturers (Jinko Tiger Neo, JA Deep Blue, Trina Vertex S+) carry 25-year product warranties with an 87.4%/25-year power floor versus 84.8% here. The 2.6 pp power retention gap on a 10 kWp system equals roughly 260 Wp of permanent lost capacity. - **PERC technology in market decline** - PERC (P-type) fell to approximately 12% of global new module production share in 2025, while N-type TOPCon exceeded 80% (InfoLink, 2025). Growing TOPCon/HJT dominance means that component availability, service support, and installer familiarity with PERC will systematically shrink across the 15–25-year operational horizon of a typical PV system. ## About this series The Hiwatt Solar HW-M372H(380-400) series consists of monocrystalline modules using the **N-type half-cell** technology, designed for high energy production even in real operating conditions. Thanks to its refined electrical architecture and operation at lower currents, the modules help minimize losses and the risk of localized overheating, resulting in more stable performance over time. In practice, this means fewer problems in installations exposed to partial shading, dirt, or uneven conditions on rooftops. A notable feature is the **enhanced resistance to PID**, achieved through control of the production process and materials - this is important for investors who want to maintain performance parameters over longer distances without noticeable drops at the start. The series also offers a **favorable temperature coefficient**, meaning it performs better in hot weather when many panels noticeably lose efficiency. The HW-M372H(380-400) series is suitable for homes, businesses, and prosumer installations, where **low energy costs over the lifetime** and long-term reliability are important. ## Notable figures - Efficiency of 20.3% matches the \*\*PERC 400-450W\*\* median - 202.9 W/m² power density is 3.3 W/m² below \*\*PERC 400-450W\*\* median (206.2 W/m²) - requires larger installation area - At -0.34%/°C, hot weather performance is typical for \*\*PERC 400-450W\*\* panels - #11769 for efficiency, #8778 for temperature performance out of 14005 panels ## Questions ### What is N-type half-cut cell technology and how does it differ from PERC in the Hiwatt Solar HW-M372H series? N-type cells deliver lower long-term degradation and higher efficiency than standard P-type PERC cells. The half-cut design reduces internal resistance and minimizes power loss under partial shading — for example from chimneys or dormers. In the HW-M372H series, this translates into module efficiency up to 20.3% and better real-world energy yields compared to conventional PERC technology. ### What warranty does the Hiwatt Solar HW-M372H(380-400) come with? The series carries a 12-year product warranty covering material and manufacturing defects, plus a 25-year linear power warranty — modules must retain at least 84.8% of nominal power at end of term. This is a key input when calculating LCOE for residential or commercial systems. It is worth noting that Hiwatt Solar is not currently listed among Bloomberg BNEF Tier 1 manufacturers, which may be relevant for project financing or bankability assessments. ### Do the HW-M372H panels lose much output on hot summer days? The HW-M372H series has a temperature coefficient of Pmax at -0.34%/°C, which is more favorable than typical PERC modules (-0.37 to -0.40%/°C). When panel surface temperatures climb to 60–65°C on sunny summer days, power losses relative to STC ratings are noticeably lower than with older-generation technology. The series holds its output better precisely when irradiance peaks and energy demand is highest. ### Are the HW-M372H(380-400) panels resistant to PID? Yes. The HW-M372H modules feature enhanced PID (Potential Induced Degradation) resistance, achieved through a controlled manufacturing process and optimized material selection. PID can silently degrade modules in high-voltage systems, especially in humid climates. The built-in PID resistance ensures long-term output stability — essential for investors relying on consistent energy yields across the full 25-year power warranty period. ### Are Hiwatt Solar HW-M372H panels suitable for a standard pitched residential roof? Yes, the HW-M372H(380-400) series is designed for residential, prosumer, and commercial rooftop installations. Module dimensions are 1979 × 996 × 35 mm with a weight of 21.5 kg — a standard footprint compatible with typical pitched-roof racking systems. At up to 400 Wp with half-cut cell technology, the modules perform well even on roof sections with partial shading or uneven irradiance conditions. ### What is the maximum power output of the HW-M372H panel and will it work with standard inverters? The top variant of the HW-M372H series reaches 400 Wp at up to 20.3% module efficiency. This is a mainstream power class compatible with most single-phase and three-phase residential and commercial inverters available today. When designing the system, always verify the inverter's MPPT voltage range to correctly size the string and avoid exceeding the maximum system voltage rating. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/HW-M372H-380-400-b6aacc1126ff.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, +2.8 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, +2.8 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, +2.7 pp | | [Huayao HY440-N108BDD](https://comparepv.com/panel/huayao-hy440-n108bdd) | 450 W | +50 W, +2.7 pp, +5 yr warranty | | [BYD NLBK-27-450](https://comparepv.com/panel/byd-nlbk-27-450) | 450 W | +50 W, +2.7 pp, +5 yr warranty | | [Renesola RS41-450NBG-E3](https://comparepv.com/panel/renesola-rs41-450nbg-e3) | 450 W | +50 W, cooler, +2.7 pp | | [Hiwatt Solar HW-P372H-330](https://comparepv.com/panel/hiwatt-solar-hw-p372h-330) | 330 W | -70 W, -3.6 pp | | [Hiwatt Solar HW-P372H-335](https://comparepv.com/panel/hiwatt-solar-hw-p372h-335) | 335 W | -65 W, -3.3 pp | | [Hiwatt Solar HW-P372H-340](https://comparepv.com/panel/hiwatt-solar-hw-p372h-340) | 340 W | -60 W, -3.1 pp | | [Hiwatt Solar HW-P372H-345](https://comparepv.com/panel/hiwatt-solar-hw-p372h-345) | 345 W | -55 W, -2.8 pp | | [Hiwatt Solar HW-P372H-350](https://comparepv.com/panel/hiwatt-solar-hw-p372h-350) | 350 W | -50 W, -2.5 pp | | [Hiwatt Solar HW-M372H-380](https://comparepv.com/panel/hiwatt-solar-hw-m372h-380) | 380 W | -20 W, -1.0 pp | | [Hiwatt Solar HW-M372H-385](https://comparepv.com/panel/hiwatt-solar-hw-m372h-385) | 385 W | -15 W, -0.8 pp | | [Hiwatt Solar HW-M372H-390](https://comparepv.com/panel/hiwatt-solar-hw-m372h-390) | 390 W | -10 W, -0.5 pp | | [Hiwatt Solar HW-M372H-395](https://comparepv.com/panel/hiwatt-solar-hw-m372h-395) | 395 W | -0.3 pp | | [Maxeon SPR-MAX7-475](https://comparepv.com/panel/maxeon-spr-max7-475) | 475 W | +75 W, +3.7 pp, +15 yr warranty | --- Source: https://comparepv.com/panel/hiwatt-solar-hw-m372h-400 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.