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Hiwatt Solar Brand review

HW-P372H-350

350 Wp Polycrystalline
ComparePV verdict

Middle of its segment, modest efficiency

Rank 13,177 of 14,005
Compare panels Datasheet PDF
Power (Wp)
350
Weak · bottom 16%
Efficiency (%)
17.80
Weak · bottom 10%
Density (Wp/m²)
177.6
Weak · bottom 10%
Temp (%/°C)
-0.340
Typical · median -0.340
Weight (kg)
21.5
Weak · bottom 19%
Warranty (yrs)
25
Weak · bottom 23%

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.

Ranking

4,542 panels in the 250-450 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 17.80% 20.74% Weak · bottom 10% 13,274
Power density 177.6 207.4 Weak · bottom 10% 13,274
Temperature coefficient -0.340 -0.340 Typical 8,778
Weight per kWp 61.4 54.4 Weak · bottom 19% 12,643
Performance warranty 25 yrs 30 yrs Weak · bottom 23% 9,798
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

4 positive · 7 caution
Best for

Commercial and shaded-installations.

Not ideal for

Tight roof space, roofs where every square metre has to count and weight-limited structures.

Watch-outs
17.80% module efficiency

Bottom 10% of the 250-450 W band, against a median of 20.74%.

177.6 watts per square metre

Bottom 10% of the 250-450 W band, against a median of 207.4.

61.4 kg per kWp

Bottom 19% of the 250-450 W band, against a median of 54.4.

What owners get
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.

Trade-offs
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.

Notes from the database
  • Efficiency of 17.8% is 4.0pp below the database median (21.8%)
  • Power density of 177.6 W/m² is 40.5 W/m² below database median (218.1 W/m²) - needs more roof space
  • -0.34%/°C temperature coefficient - 0.04pp worse than database median (-0.30%/°C), expect higher hot weather losses
  • Weight of 21.5 kg (5.0 kg below database median of 26.5 kg) allows easier transport and roof mounting
  • #13274 for efficiency, #8778 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 350 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 17.80 % Weak Segment median 20.74%
Vmpp · Impp 38.10 V · 9.19 A Operating point at max power
Voc · Isc 46.77 V · 9.75 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1979×996×35 mm · 1.97 m² of roof
Weight 21.5 kg Weak Weak · bottom 19%
Cells 72 Polycrystalline
Coefficient Pmax -0.340 %/°C Typical median -0.340 of its segment
Coefficient Voc · Isc -0.250 · 0.040 %/°C
NOCT 43 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 25 years Weak bottom 23% · median 30 yrs
End-of-warranty output 84.8 % Equals 287 W guaranteed
Degradation 2.00 → 0.55 % First year, then annual

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.340 %/°C against a segment median of -0.340
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Hiwatt Solar HW-P372H-350 350 W 17.80% -0.340 21.5 kg You are here
LNSK-340M 340 W 20.08% -0.360 21.0 kg -10 W, hotter, +2.3 pp
CS3K-330P 330 W 19.90% -0.360 18.5 kg -20 W, lighter, +2.1 pp
CS3K-335MB-AG 335 W 19.90% -0.360 22.3 kg Hotter, +2.1 pp, +5 yr warranty
CS3U-395P 395 W 19.90% -0.360 22.5 kg +45 W, hotter, +2.1 pp
LNSU-400M 400 W 19.81% -0.360 24.5 kg +50 W, heavier, +2.0 pp
LNSK-335M 335 W 19.78% -0.360 21.0 kg -15 W, hotter, +2.0 pp
LNSF-400M 400 W 19.76% -0.360 23.5 kg +50 W, heavier, +2.0 pp
CS3L-365P 365 W 19.70% -0.360 21.1 kg +15 W, hotter, +1.9 pp
HW-P372H-330 330 W 16.70% -0.340 21.5 kg -20 W, -1.1 pp
HW-P372H-335 335 W 17.00% -0.340 21.5 kg -15 W, -0.8 pp
HW-P372H-340 340 W 17.20% -0.340 21.5 kg -10 W, -0.6 pp
HW-P372H-345 345 W 17.50% -0.340 21.5 kg -0.3 pp
HW-M372H-380 380 W 19.30% -0.340 21.5 kg +30 W, +1.5 pp
HW-M372H-385 385 W 19.50% -0.340 21.5 kg +35 W, +1.7 pp
HW-M372H-390 390 W 19.80% -0.340 21.5 kg +40 W, +2.0 pp
HW-M372H-395 395 W 20.00% -0.340 21.5 kg +45 W, +2.2 pp
SPR-MAX7-475 475 W 24.00% -0.270 21.1 kg +125 W, +6.2 pp, +15 yr warranty

Found 93 panels of the same or similar size to this one, within ±10 mm. See them here Found 304 panels of the same or similar size to this one, within ±25 mm. See them here Found 439 panels of the same or similar size to this one, within ±50 mm. See them here Found 566 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
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.
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