--- title: "Hiwatt Solar HW-P372H-340 340W Solar Panel - Specs & Review | ComparePV" description: "Hiwatt Solar HW-P372H-340 340W solar panel. Specs: 17.20% efficiency, Polycrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/hiwatt-solar-hw-p372h-340" updated: 2026-09-11 --- # Hiwatt Solar HW-P372H-340 Middle of its segment, modest efficiency 3,730 panels in the 240-440 W band, all technologies ## Identity - **Manufacturer:** Hiwatt Solar - **Model:** HW-P372H-340 - **Series:** HW-P372H(330-350) - **Rated power:** 340 W - **Cell technology:** Polycrystalline ## How it compares Compared against 240-440 W band, all technologies (3730 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 340 W | 400 W | Weak - bottom 17% | | | Module efficiency | 17.20% | 20.50% | Weak - bottom 9% | 13,404 | | Power density | 172.5 | 204.8 | Weak - bottom 10% | 13,385 | | Temperature coefficient | -0.340 | -0.340 | Typical | 8,778 | | Weight (kg) | 21.5 kg | 21.5 kg | Weak - bottom 19% | | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 17.20% | 20.50% | Weak - bottom 9% | 13,404 | | Power density | 172.5 | 204.8 | Weak - bottom 10% | 13,385 | | Temperature coefficient | -0.340 | -0.340 | Typical | 8,778 | | Weight per kWp | 63.2 | 55.0 | Weak - bottom 19% | 12,869 | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Watch out for - **17.20% module efficiency** - Bottom 9% of the 240-440 W band, against a median of 20.50%. Ranked 13,404th in the whole database. - **172.5 watts per square metre** - Bottom 10% of the 240-440 W band, against a median of 204.8. Ranked 13,385th in the whole database. - **63.2 kg per kWp** - Bottom 19% of the 240-440 W band, against a median of 55.0. - **Best for:** Commercial and shaded-installations. - **Not ideal for:** Tight roof space, roofs where every square metre has to count and weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 340 W - **Efficiency:** 17.20 % - **Voltage at Pmax (Vmp):** 37.74 V - **Current at Pmax (Imp):** 9.01 A - **Open-circuit voltage (Voc):** 46.37 V - **Short-circuit current (Isc):** 9.55 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:** Polycrystalline - **Cell count:** 72 ### Physical - **Length:** 1979 mm - **Width:** 996 mm - **Thickness:** 35 mm - **Weight:** 21.5 kg - **Area:** 1.97 m2 - **Power density:** 172.5 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:** 279 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 13404 of 14005 | | Power density | 13385 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 12869 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Half-cut technology reduces shading losses** - The 72-cell module is split into two independent electrical sections, minimizing resistive losses and maintaining power output under partial shading conditions. In typical rooftop scenarios, this translates to a real annual yield gain of 2–3% compared to conventional full-cell modules. - **PID-resistant design** - The module incorporates anti-PID design measures, which is critical for long-term performance in commercial and utility-scale plants — especially in 1000 V DC systems — where potential-induced degradation can silently erode output. This stabilizes yields across the full investment horizon. - **25-year linear power warranty** - The manufacturer provides a 25-year power warranty (0.55% annual degradation) and a 12-year product/workmanship warranty. The power warranty parameters meet the Tier-1 segment standard and satisfy typical bankability due diligence requirements for sub-1 MW projects. - **High mechanical load resistance** - The frame is certified for high snow and wind loads — a critical specification for Polish installations where snow loads can exceed 2,400 Pa. The half-cut architecture also reduces hot-spot risk, extending cell longevity under harsh climate conditions. ## Cons - **Discontinued series** - The HW-P372H(330–350) series has been officially discontinued. This means no availability of matching modules for system expansion, limited warranty replacement stock, and potential difficulties sourcing like-for-like replacements in case of panel failure years into operation. - **Efficiency 2.6–3.3 pp below direct peers** - The 16.7–17.8% efficiency range is significantly lower than comparable models in the same power class (≤350 Wp): JA Solar JAM60D10 reaches 20.4%, Jinko JS Solar 120 Series 20.7%, and YS Solar SM-90 21.0%. For the same rooftop or field area, this translates to roughly 15–18% less installed capacity. - **Non-bankable manufacturer (non-Tier-1 BNEF)** - Hiwatt Solar does not appear on the BNEF Tier-1 bankable manufacturers list, which restricts deployment in projects seeking external debt financing. Banks and infrastructure funds standardly require Tier-1 modules or additional credit enhancements, increasing transaction costs. - **Monofacial only — bifacial available from peers** - The panel is monofacial, while the comparable JA Solar JAM60D10 is available in a bifacial version (/MB suffix). Bifacial modules generate an additional 5–20% energy from rear-surface albedo reflections, especially on light-colored concrete or ground-mounted arrays — an advantage this series cannot deliver. ## About this series The Hiwatt Solar HW-P372H(330-350) photovoltaic module series is an efficient 72-cell solution designed to maximize yields in commercial installations and solar farms. The main advantage of this line is the use of **half-cut cell technology**, which effectively reduces internal resistive losses and improves module efficiency under partial shading conditions. By dividing the panel into two independent sections, the system generates energy even with limited sunlight on part of its surface, which directly translates into higher investment profitability. The construction stands out for its **excellent resistance to potential-induced degradation (PID)**, ensuring stable operation and maintenance of technical parameters over many years of service. Optimization of the electrical design has allowed for a **significant reduction in the risk of hot-spots**, which increases fire safety and extends cell lifespan. The Hiwatt Solar HW-P372H is also characterized by **high resistance to mechanical loads**, such as snow pressure or strong wind gusts, making it a reliable choice for the demanding Polish climate. These panels represent an ideal balance between proven technology and low levelized cost of energy (LCOE), being the **optimal choice for investors** focusing on reliability and predictable return on capital. ## Notable figures - At 17.2% efficiency, this panel is 4.6pp below the \*\*database\*\* median of 21.8% - Power density of 172.5 W/m² is 45.6 W/m² below \*\*database\*\* median (218.1 W/m²) - needs more roof space - Temperature coefficient of -0.34%/°C is 0.04pp worse than \*\*database\*\* median (-0.30%/°C) - higher losses in summer heat - Weight of 21.5 kg (5.0 kg below \*\*database\*\* median of 26.5 kg) allows easier transport and roof mounting - #13404 for efficiency, #8778 for temperature performance out of 14005 panels ## Questions ### Is the Hiwatt Solar HW-P372H(330-350) series still available for purchase? The HW-P372H(330-350) series has been discontinued and is no longer actively distributed by the manufacturer. Limited stock may still be available through select wholesalers. If you are planning a new commercial installation, it is advisable to consider newer half-cut modules with higher wattage and longer manufacturer warranties rather than relying on remaining inventory of this discontinued line. ### What warranty does the Hiwatt Solar HW-P372H come with? Hiwatt Solar provides a 12-year product warranty covering material and manufacturing defects, along with a 25-year linear power output warranty. This means the module should maintain output above the declared degradation threshold for a quarter century. Note that Hiwatt Solar is not classified as a Tier 1 manufacturer, which may affect the long-term enforceability of these warranty commitments if the company undergoes ownership or operational changes. ### What are half-cut cells in the HW-P372H series and do they actually improve performance? Half-cut cell technology involves slicing each standard cell into two smaller halves. The reduced cell area lowers internal resistance and thermal losses, delivering a real efficiency gain of roughly 1–3% compared to full-cell modules. The panel is split into two independent electrical sections, so shading on the lower half — from a gutter, railing, or nearby object — does not completely block output from the upper section, improving energy yield in real-world conditions. ### Does the HW-P372H 350W module perform well under partial shading on a solar farm? Yes. The dual independent electrical sections mean that shading on part of the module limits losses only to the shaded section. On utility-scale and commercial solar farms, where inter-row shading or local obstructions are common, the half-cut cell design in the HW-P372H significantly reduces production losses compared to conventional full-cell 72-cell modules, contributing to a lower LCOE over the system lifetime. ### Can the Hiwatt Solar HW-P372H handle heavy snow loads and high winds typical of Central European climates? The HW-P372H series is built for high mechanical durability. Modules in this class are typically certified for snow loads up to 5400 Pa and wind loads up to 2400 Pa, meeting requirements for most installation sites across Poland and Central Europe. The aluminum frame and tempered safety glass provide structural integrity throughout the full 25-year power warranty period, even under demanding weather conditions. ### Is the HW-P372H series resistant to PID, and how does that affect long-term energy production? Yes, the HW-P372H modules feature built-in resistance to Potential Induced Degradation (PID). In large commercial systems operating at high DC string voltages — up to 1000 V — PID susceptibility can cause irreversible power loss exceeding 10–20% within just a few years. The PID resistance of this series ensures stable energy yields and predictable return on investment across the intended operational lifespan. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/HW-P372H-330-350-3521059e2bc2.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [SunLink LNSK-340M](https://comparepv.com/panel/sunlink-lnsk-340m) | 340 W | Hotter, +2.9 pp | | [Canadian Solar CS3K-330P](https://comparepv.com/panel/canadian-solar-cs3k-330p) | 330 W | Hotter, lighter, +2.7 pp | | [Canadian Solar CS3K-335MB-AG](https://comparepv.com/panel/canadian-solar-cs3k-335mb-ag) | 335 W | Hotter, +2.7 pp, +5 yr warranty | | [SunLink LNSK-335M](https://comparepv.com/panel/sunlink-lnsk-335m) | 335 W | Hotter, +2.6 pp | | [Canadian Solar CS3L-365P](https://comparepv.com/panel/canadian-solar-cs3l-365p) | 365 W | +25 W, hotter, +2.5 pp | | [Canadian Solar CS3U-390P](https://comparepv.com/panel/canadian-solar-cs3u-390p) | 390 W | +50 W, hotter, +2.5 pp | | [Canadian Solar CS3K-325P](https://comparepv.com/panel/canadian-solar-cs3k-325p) | 325 W | Hotter, lighter, +2.4 pp | | [Hiwatt Solar HW-P372H-330](https://comparepv.com/panel/hiwatt-solar-hw-p372h-330) | 330 W | -10 W, -0.5 pp | | [Hiwatt Solar HW-P372H-335](https://comparepv.com/panel/hiwatt-solar-hw-p372h-335) | 335 W | Very close match | | [Hiwatt Solar HW-P372H-345](https://comparepv.com/panel/hiwatt-solar-hw-p372h-345) | 345 W | +0.3 pp | | [Hiwatt Solar HW-P372H-350](https://comparepv.com/panel/hiwatt-solar-hw-p372h-350) | 350 W | +10 W, +0.6 pp | | [Hiwatt Solar HW-M372H-380](https://comparepv.com/panel/hiwatt-solar-hw-m372h-380) | 380 W | +40 W, +2.1 pp | | [Hiwatt Solar HW-M372H-385](https://comparepv.com/panel/hiwatt-solar-hw-m372h-385) | 385 W | +45 W, +2.3 pp | | [Hiwatt Solar HW-M372H-390](https://comparepv.com/panel/hiwatt-solar-hw-m372h-390) | 390 W | +50 W, +2.6 pp | | [Hiwatt Solar HW-M372H-395](https://comparepv.com/panel/hiwatt-solar-hw-m372h-395) | 395 W | +55 W, +2.8 pp | | [Hiwatt Solar HW-M372H-400](https://comparepv.com/panel/hiwatt-solar-hw-m372h-400) | 400 W | +60 W, +3.1 pp | | [Maxeon SPR-MAX7-475](https://comparepv.com/panel/maxeon-spr-max7-475) | 475 W | +135 W, +6.8 pp, +15 yr warranty | --- Source: https://comparepv.com/panel/hiwatt-solar-hw-p372h-340 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.