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Hiwatt Solar Brand review

HW-M10/120H-455

455 Wp PERC
ComparePV verdict

Strong in heat, no clear weak spot

Rank 10,894 of 14,005
Compare panels Datasheet PDF
Power (Wp)
455
Typical for its class
Efficiency (%)
21.00
Typical · median 20.82%
Density (Wp/m²)
210.3
Typical · median 208.5
Temp (%/°C)
-0.340
Strong · top 19%
Weight (kg)
25.0
Typical · median 24.5 kg
Warranty (yrs)
25
Typical · median 25 yrs

The Hiwatt Solar HW-M10/120H series utilizes advanced monocrystalline cells based on the M10 silicon wafer, which directly translates into higher power density while maintaining optimal module dimensions. The use of Half-Cut technology effectively reduces resistive losses and minimizes the negative impact of partial shading on system efficiency, which is crucial in the Polish conditions of dense development. The module design is based on a multi-busbar layout that shortens the current flow path, thereby increasing resistance to micro-cracks and ensuring parameter stability over a long-term horizon. These panels are characterized by a low temperature coefficient, allowing them to operate more efficiently on hot days when standard panels lose their rated power. The HW-M10/120H is a solution dedicated to investors seeking an optimal balance between costs and energy yield, performing perfectly on both single-family house roofs and in commercial installations. A robust frame and high resistance to mechanical loads make this series a secure foundation for projects designed for decades of operation, effectively distancing itself from budget competition in terms of cell manufacturing quality.

Ranking

449 panels in the segment PERC 450-500 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.00% 20.82% Typical 9,758
Power density 210.3 208.5 Typical 9,646
Temperature coefficient -0.340 -0.350 Strong · top 19% 8,778
Weight per kWp 54.9 53.1 Typical 9,326
Performance warranty 25 yrs 25 yrs Typical 9,798
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

5 positive · 4 caution
Best for

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

Strengths
-0.340 %/°C temperature coefficient

Top 19% of the PERC 450-500 W segment, against a median of -0.350.

What owners get
Half-cut cells + M10 wafer (182 mm)

120 half-cut cells on the standard M10 wafer (182×182 mm) shorten current paths and reduce resistive losses. Under partial shading, at most 50% of the string is deactivated rather than the entire string — a key advantage in densely built residential environments with chimneys or dormers.

Multi-busbar (MBB) design

The multi-busbar layout shortens carrier travel distances, reducing the risk of microcracks under mechanical load and stabilizing output parameters across the full 25-year linear power warranty period.

Up to 21.2% efficiency — above Zonergy

Peak module efficiency of 21.2% (460 Wp variant) positions this series above the directly comparable Zonergy ZPM MH3-72 (21.16% at 460 Wp) within the same price segment and at an identical power ceiling.

25-year linear power warranty

The standard 25-year linear power warranty covers the full typical payback period of a prosumer installation (15–20 years) and meets the minimum requirements of most PV project financing agreements with banking institutions.

Trade-offs
PERC vs. N-type TOPCon — ~1.8 pp efficiency gap

Peer Risen RSM96-11-440-460BNDG (N-type TOPCon) achieves 23% efficiency at the same 460 Wp; SunKean SKT440–460M12 reaches 23.02%. Hiwatt's PERC cells top out at 21.2%, requiring approximately 8.5% more roof area for equivalent energy yield. PERC also exhibits higher LID degradation rates than N-type technology, resulting in lower annual yield after 5–10 years of operation.

Non-bankable — absent from BNEF Tier-1 list

Hiwatt Solar does not appear on the BNEF Tier-1 module manufacturer list (verified against BNEF methodology published March 2026). Banks structuring non-recourse PV project finance standardly require Tier-1 modules, effectively excluding this series from most commercial and utility-scale projects above ~100 kWp seeking third-party debt financing.

12-year product warranty — below current market standard

Jinko Solar (Tier-1) offers a 25-year product warranty; Risen Energy provides 15 years on comparable TOPCon models. Hiwatt's 12-year workmanship and materials warranty leaves over half of the typical 25-year operational lifecycle without manufacturer defect coverage.

Monofacial only — no bifacial yield gain

Peer Risen RSM96-11-440-460BNDG is a bifacial dual-glass module delivering 5–15% additional yield from ground-reflected irradiance. The Hiwatt HW-M10/120H is strictly monofacial, limiting generation potential — most notably for ground-mounted arrays and flat rooftops with high-reflectivity membranes.

Notes from the database
  • Efficiency of 21.0% matches the PERC 450-500W median
  • Power density of 210.3 W/m² matches the PERC 450-500W median
  • At -0.34%/°C, hot weather performance is typical for PERC 450-500W panels
  • In the top 70% for efficiency among all PERC panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 455 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.00 % Typical Segment median 20.82%
Vmpp · Impp 34.06 V · 13.36 A Operating point at max power
Voc · Isc 41.33 V · 13.93 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1908×1134×35 mm · 2.16 m² of roof
Weight 25.0 kg Typical Typical · median 24.5 kg
Cells 120 · PERC Monocrystalline
Coefficient Pmax -0.340 %/°C Strong top 19% 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 373 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-M10/120H-455 455 W 21.00% -0.340 25.0 kg You are here
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg Cooler, +3.8 pp, +5 yr warranty
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +50 W, cooler, +3.7 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg Cooler, +3.5 pp, +5 yr warranty
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg Cooler, +3.5 pp, +5 yr warranty
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg Cooler, +3.5 pp, +5 yr warranty
GK-3-54HGb-500M 500 W 24.50% -0.260 21.4 kg Cooler, +3.5 pp, +5 yr warranty
HW-M10/120H-440 440 W 20.30% -0.340 25.0 kg -15 W, -0.7 pp
HW-M10/120H-445 445 W 20.50% -0.340 25.0 kg -10 W, -0.5 pp
HW-M10/120H-450 450 W 20.80% -0.340 25.0 kg Very close match
HW-M10/120H-460 460 W 21.20% -0.340 25.0 kg Very close match
LR7-60HVH-560M 560 W 24.80% -0.260 25.0 kg +105 W, cooler, +3.8 pp
LR7-60HVH-555M 555 W 24.60% -0.260 25.0 kg +100 W, cooler, +3.6 pp
LR7-60HVHL-550M 550 W 24.40% -0.260 16.3 kg +95 W, lighter, +3.4 pp
JAT60S40-540/LR 540 W 24.40% -0.260 23.5 kg +85 W, cooler, +3.4 pp
GK-5-60HG-540M 540 W 24.40% -0.260 23.3 kg +85 W, cooler, +3.4 pp
JKM545-54QL6-DV-F1-EU 545 W 24.27% -0.260 27.5 kg +90 W, cooler, +3.3 pp

Found 746 panels of the same or similar size to this one, within ±10 mm. See them here Found 755 panels of the same or similar size to this one, within ±25 mm. See them here Found 910 panels of the same or similar size to this one, within ±50 mm. See them here Found 1489 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranty does the Hiwatt Solar HW-M10/120H series come with?
The HW-M10/120H series includes a 12-year product warranty covering material defects and workmanship, plus a 25-year linear power output warranty. This means the manufacturer guarantees a defined minimum energy yield for a quarter century. When choosing rooftop panels for a residential system, these figures are a key indicator of long-term reliability and investment security.
What does the half-cut cell technology in the HW-M10/120H mean for shading from a chimney or dormer?
Half-cut technology splits each PERC cell in half, shortening the current path and reducing resistive losses. The critical shading benefit: the top and bottom halves of each module operate independently, so a shadow cast by a chimney or dormer only reduces output from part of the panel rather than the whole string. This is a meaningful advantage in densely built Polish neighborhoods.
What is the peak power of the HW-M10/120H and how many panels does a typical home need?
Each HW-M10/120H module delivers 460 Wp under STC conditions. A typical single-family home consuming around 4,000–5,000 kWh per year generally needs 8–12 panels, resulting in a system of roughly 3.7–5.5 kWp. The exact count depends on roof orientation, tilt angle, local irradiance, and the household's individual consumption profile.
Is the HW-M10/120H a bifacial panel, and does the lack of bifaciality matter for a rooftop installation?
The HW-M10/120H is not bifacial — it captures sunlight from the front face only. On typical rooftop installations with dark underlayment or dark tiles, bifacial gain from reflected albedo is negligible anyway. The absence of bifaciality is therefore not a practical drawback for residential prosumer systems, where front-side efficiency, cost, and ease of installation matter most.
Is Hiwatt Solar a Tier 1 manufacturer, and does that affect financing my solar installation?
Hiwatt Solar is not listed on Bloomberg NEF Tier 1 rankings. That classification reflects a manufacturer's creditworthiness and production scale rather than panel quality directly. However, some banks and leasing companies require Tier 1 panels as a loan condition. If you plan to finance your system through a bank loan or leasing product, verify the lender's panel eligibility requirements before purchasing.
Do the Hiwatt Solar HW-M10/120H panels perform well in summer when rooftop temperatures exceed 50°C?
The PERC cells on an M10 wafer used in the HW-M10/120H series feature a low temperature coefficient, meaning power output drops less per degree Celsius above the 25°C STC reference than many budget alternatives. On hot summer days the modules retain a higher share of their rated wattage, translating into a better annual energy yield under the continental climate typical of Poland.
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