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Hiwatt Solar Brand review

HW-M372H-390

390 Wp PERC
ComparePV verdict

Strong in heat, no clear weak spot

Rank 12,487 of 14,005
Compare panels Datasheet PDF
Power (Wp)
390
Typical for its class
Efficiency (%)
19.80
Typical · median 19.90%
Density (Wp/m²)
197.9
Typical · median 199.0
Temp (%/°C)
-0.340
Strong · top 15%
Weight (kg)
21.5
Typical · median 21.4 kg
Warranty (yrs)
25
Typical · median 25 yrs

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.

Ranking

579 panels in the segment PERC 350-400 W
Metric This panel Median Position in segment Overall rank
Module efficiency 19.80% 19.90% Typical 12,416
Power density 197.9 199.0 Typical 12,401
Temperature coefficient -0.340 -0.350 Strong · top 15% 8,778
Weight per kWp 55.1 55.8 Typical 9,554
Performance warranty 25 yrs 25 yrs Typical 9,798
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

6 positive · 3 caution
Best for

Residential, commercial, shaded-installations and hot-climate.

Strengths
-0.340 %/°C temperature coefficient

Top 15% of the PERC 350-400 W segment, against a median of -0.350.

What owners get
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.

Trade-offs
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.

Notes from the database
  • Efficiency of 19.8% matches the PERC 0-400W median
  • At 197.9 W/m² power density, this panel generates 3.5 W/m² more per unit area than PERC 0-400W median (194.4 W/m²)
  • Temperature coefficient of -0.34%/°C matches the PERC 0-400W median
  • Weight of 21.5 kg is typical for PERC 0-400W panels
  • #12416 for efficiency, #8778 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 390 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 19.80 % Typical Segment median 19.90%
Vmpp · Impp 39.87 V · 9.79 A Operating point at max power
Voc · Isc 49.06 V · 10.22 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 Typical Typical · median 21.4 kg
Cells 72 · PERC Monocrystalline
Coefficient Pmax -0.340 %/°C Strong top 15% 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 Typical median 25 yrs · median 25 yrs
End-of-warranty output 84.8 % Equals 320 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 -0.350
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Hiwatt Solar HW-M372H-390 390 W 19.80% -0.340 21.5 kg You are here
LX-440M/182-108+GG 440 W 23.07% -0.240 23.6 kg +50 W, cooler, +3.3 pp
GKA210M340W 340 W 23.00% - 16.2 kg -50 W, lighter, +3.2 pp
GKA210M360W 360 W 23.00% - 16.2 kg Lighter, +3.2 pp, +5 yr warranty
GKA210M380W (1/4*4*38) 380 W 23.00% - 17.1 kg Lighter, +3.2 pp, +5 yr warranty
GKA210M400W (1/2*4*20) 400 W 23.00% - 18.0 kg Lighter, +3.2 pp, +5 yr warranty
GKA210M400W (1/4*4*40) 400 W 23.00% - 18.0 kg Lighter, +3.2 pp, +5 yr warranty
GKA210M380W (1/2*4*19) 380 W 23.00% - 17.1 kg Lighter, +3.2 pp, +5 yr warranty
JT440SYK(B) 440 W 22.90% -0.240 23.0 kg +50 W, cooler, +3.1 pp
HW-P372H-330 330 W 16.70% -0.340 21.5 kg -60 W, -3.1 pp
HW-P372H-335 335 W 17.00% -0.340 21.5 kg -55 W, -2.8 pp
HW-P372H-340 340 W 17.20% -0.340 21.5 kg -50 W, -2.6 pp
HW-P372H-345 345 W 17.50% -0.340 21.5 kg -45 W, -2.3 pp
HW-P372H-350 350 W 17.80% -0.340 21.5 kg -40 W, -2.0 pp
HW-M372H-380 380 W 19.30% -0.340 21.5 kg -10 W, -0.5 pp
HW-M372H-385 385 W 19.50% -0.340 21.5 kg -0.3 pp
HW-M372H-395 395 W 20.00% -0.340 21.5 kg Very close match
SPR-MAX7-475 475 W 24.00% -0.270 21.1 kg +85 W, +4.2 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
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.
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