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Hiwatt Solar Brand review

HW-M360H-320

320 Wp PERC
ComparePV verdict

Strong in heat, no clear weak spot

Rank 13,057 of 14,005
Compare panels Datasheet PDF
Power (Wp)
320
Typical for its class
Efficiency (%)
19.30
Typical · median 19.00%
Density (Wp/m²)
193.0
Typical · median 190.0
Temp (%/°C)
-0.340
Strong · top 8%
Weight (kg)
17.8
Strong · 1.2 kg below median
Warranty (yrs)
25
Typical · median 25 yrs

The Hiwatt Solar HW-M360H series consists of advanced photovoltaic modules that base their performance on Half-Cut cell technology. This solution significantly reduces energy losses resulting from internal resistance, which translates into higher yields even in difficult lighting conditions. Thanks to the use of nine busbars (9BB), these panels offer better current flow and increased resistance to micro-cracks, which directly extends the lifespan of the entire installation. Users will appreciate them primarily for their high efficiency in low sunlight conditions, which is a key advantage in the Polish climate, allowing for a faster return on investment. The construction of the HW-M360H modules has been designed to minimize the impact of partial shading, ensuring that the system operates stably regardless of the time of day. It is an ideal choice for prosumers looking for a balance between modern technology and an attractive price, dedicated to both installation on the roofs of single-family houses and in larger commercial systems. Robust construction and precise workmanship guarantee increased mechanical resistance to extreme snow loads and strong winds, which sets this series apart from the competition as an exceptionally durable and safe solution for every Polish investor.

Ranking

286 panels in the segment PERC 300-350 W
Metric This panel Median Position in segment Overall rank
Module efficiency 19.30% 19.00% Typical 12,799
Power density 193.0 190.0 Typical 12,787
Temperature coefficient -0.340 -0.360 Strong · top 8% 8,778
Weight per kWp 55.6 60.0 Strong · top 11% 9,999
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 · 4 caution
Best for

Residential, commercial and shaded-installations.

Strengths
-0.340 %/°C temperature coefficient

Top 8% of the PERC 300-350 W segment, against a median of -0.360. Ranked 8,778th in the whole database.

55.6 kg per kWp

Top 11% of the PERC 300-350 W segment, against a median of 60.0.

What owners get
Half-cut cells + 9-busbar design

Half-cut cell technology combined with 9 busbars (9BB) reduces resistive losses by approximately 2–3% versus full cells with 5BB, lowers microfracture risk, and improves partial-shading tolerance — directly translating into higher annual energy yield.

Up to 19.9% efficiency — beats Jinko 72 Series

Peak module efficiency of 19.9% places the series well above the comparably positioned Jinko Solar 72 Series Polycrystalline (17%) and nearly matches the Waaree ARKA Series (19.81%), delivering more energy per m² of available roof area.

25-year linear power warranty

The manufacturer guarantees a minimum of 84.8% of nominal power output after 25 years of operation — the industry standard for PERC-class modules — providing predictable ROI for residential prosumer installations.

Effective low-irradiance performance

Half-cut architecture and 9BB busbars maintain relatively high efficiency under diffuse irradiance conditions (overcast skies, early morning), a significant advantage in the Polish climate where a large share of annual yield comes from exactly those conditions.

Trade-offs
Series discontinued

The HW-M360H series carries 'discontinued' status. Cessation of production limits the availability of identical replacement modules for system expansion or post-failure swaps, and enforcing the 12-year product warranty and 25-year power warranty may become increasingly difficult as manufacturer support diminishes.

Manufacturer not on BNEF Tier-1 list

Hiwatt Solar does not appear on the BNEF bankable Tier-1 list (Q1 2026). This complicates securing project financing from commercial banks, limits leasing options, and reduces the residual value of the system in any potential resale scenario.

Legacy PERC technology — higher degradation

PERC cells degrade at approximately 0.5–0.7% per year, compared to 0.25–0.4%/year for modern N-type TOPCon modules (e.g., JA Solar Monocrystalline80 at 23.15% efficiency). Over 25 years, the cumulative output gap can reach 2–5 percentage points in favor of TOPCon.

Narrow power range: 310–330 Wp

The 2025–2026 residential market standard is 400–580 Wp per module. The HW-M360H's 330 Wp maximum requires more panels and mounting points, increasing balance-of-system (BoS) costs and roof structural load compared to higher-wattage alternatives.

Notes from the database
  • At 19.3% efficiency, this panel is on par with typical PERC 0-400W modules
  • Power density of 193.0 W/m² matches the PERC 0-400W median
  • Temperature coefficient of -0.34%/°C matches the PERC 0-400W median
  • At 17.8 kg, this panel is 2.7 kg lighter than PERC 0-400W median (20.5 kg) - easier handling during installation
  • #12799 for efficiency, #8778 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 320 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 19.30 % Typical Segment median 19.00%
Vmpp · Impp 32.96 V · 9.71 A Operating point at max power
Voc · Isc 40.44 V · 10.17 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1665×996×35 mm · 1.66 m² of roof
Weight 17.8 kg Strong Strong · 1.2 kg below median
Cells 60 · PERC Monocrystalline
Coefficient Pmax -0.340 %/°C Strong top 8% 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 263 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 -0.360
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Hiwatt Solar HW-M360H-320 320 W 19.30% -0.340 17.8 kg You are here
NS-300MH-72 300 W 23.32% -0.290 12.5 kg Cooler, lighter, +4.0 pp
NS-300MH-72 300 W 23.32% -0.290 12.5 kg Cooler, lighter, +4.0 pp
ZEUS 1.2 FullBlack 280W 280 W 23.31% -0.260 14.3 kg Cooler, +4.0 pp, +5 yr warranty
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, lighter, +3.8 pp
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, lighter, +3.8 pp
GKA182M285W 285 W 23.00% - 10.8 kg Lighter, +3.7 pp, +5 yr warranty
GKA182M270W 270 W 23.00% - 10.8 kg -50 W, lighter, +3.7 pp
GKA182M300W 300 W 23.00% - 16.2 kg -20 W, +3.7 pp, +5 yr warranty
GKA210M320W 320 W 23.00% - 16.2 kg Lighter, +3.7 pp, +5 yr warranty
HW-P360H-275 275 W 16.60% -0.340 17.8 kg -45 W, -2.7 pp
HW-P360H-280 280 W 16.90% -0.340 17.8 kg -40 W, -2.4 pp
HW-P360H-285 285 W 17.20% -0.340 17.8 kg -35 W, -2.1 pp
HW-P360H-290 290 W 17.50% -0.340 17.8 kg -30 W, -1.8 pp
HW-P360H-295 295 W 17.80% -0.340 17.8 kg -25 W, -1.5 pp
JT440SYK(B) 440 W 22.90% -0.240 23.0 kg +120 W, cooler, +3.6 pp
JT435SYk(B) 435 W 22.70% -0.240 23.0 kg +115 W, cooler, +3.4 pp

Found 114 panels of the same or similar size to this one, within ±10 mm. See them here Found 375 panels of the same or similar size to this one, within ±25 mm. See them here Found 432 panels of the same or similar size to this one, within ±50 mm. See them here Found 735 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-M360H series still available for purchase?
The HW-M360H series has been discontinued and is no longer actively manufactured. Some distributors may still carry limited warehouse stock. If you're looking for panels with a similar technology profile — PERC half-cut cells with a 9-busbar (9BB) architecture — consider newer Hiwatt Solar series or equivalent products from other manufacturers.
What warranty does the Hiwatt Solar HW-M360H come with?
The HW-M360H includes a 12-year product warranty covering material and workmanship defects, plus a 25-year linear power output warranty guaranteeing the module retains a specified percentage of its rated wattage over time. This warranty structure is standard for PERC-class modules and provides solid long-term protection for the system owner.
What real-world benefit do half-cut cells and 9BB busbars provide in the HW-M360H?
Half-cut cell technology splits each PERC cell in two, reducing internal resistance and resistive heating losses. Nine busbars (9BB) improve current collection efficiency and significantly lower the risk of microcracks from thermal cycling or mechanical stress during shipping and installation. Combined, these features deliver measurably higher annual energy yield and a longer service life compared to older 4BB or 5BB module designs.
How well do HW-M360H panels perform under overcast conditions typical of Poland?
The HW-M360H series is optimized for strong low-light performance, which is a critical advantage in Poland's climate where overcast skies are common for much of the year. PERC cell technology combined with half-cut architecture improves spectral response and diffuse-light harvesting, resulting in a better annual capacity factor and a shorter investment payback period even in low-irradiance regions.
Can HW-M360H panels withstand heavy snow loads and strong winds on a Polish rooftop?
Yes. The HW-M360H modules are built for enhanced mechanical durability. The anodized aluminum frame and tempered front glass protect the PERC cells against extreme snow loads and high wind-pressure events common in Central European winters. This makes them a reliable choice for rooftop installations where structural loading requirements are demanding.
How many 330 Wp HW-M360H panels do I need for a typical 6 kWp home system?
To reach 6 kWp you need approximately 18 to 19 HW-M360H panels — 18 modules yield 5.94 kWp, while 19 yield 6.27 kWp. The 330 Wp power class sits in the standard residential segment and is compatible with most residential-grade MPPT inverters, making string sizing straightforward for a typical single-family home installation.
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