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Rarlon PV Tech Brand review

RL370HM-120

370 Wp PERC
ComparePV verdict

Space saver, weak in heat

Rank 13,598 of 14,005
Compare panels Datasheet PDF
Power (Wp)
370
Typical for its class
Efficiency (%)
20.30
Strong · top 16%
Density (Wp/m²)
203.1
Strong · top 15%
Temp (%/°C)
-0.390
Weak · bottom 3%
Weight (kg)
19.5
Strong · 1.9 kg below median
Warranty (yrs)
-
Not published

The Rarlon RL350HM-370HM-120 photovoltaic panel series is an advanced solution based on Half-cut cell technology, which directly translates into higher installation efficiency in challenging lighting conditions. By dividing the cells into two parts, these modules generate lower energy losses resulting from internal resistance, making them an exceptionally stable power source even under partial shading. The design using monocrystalline PERC cells allows for more effective use of low-intensity solar radiation, which is crucial in the Polish climate zone. This solves the problem of power drops during the autumn-winter periods, providing users with a faster return on investment. The use of 120-cell technology guarantees an optimal balance between dimensions and power output, making installation easier on roofs with limited surface area. These panels stand out from the competition due to their high resistance to potential-induced degradation and excellent mechanical strength against snow and wind loads. It is an ideal choice for prosumers seeking reliability and durability at a reasonable price. This series is primarily dedicated to modern residential housing and medium-sized commercial installations, where maximizing yields from every square meter of the roof is of key importance.

Ranking

579 panels in the segment PERC 350-400 W
Metric This panel Median Position in segment Overall rank
Module efficiency 20.30% 19.90% Strong · top 16% 11,769
Power density 203.1 199.0 Strong · top 15% 11,759
Temperature coefficient -0.390 -0.350 Weak · bottom 3% 13,579
Weight per kWp 52.7 55.8 Strong · top 20% 6,344
Performance warranty - 25 yrs Not published 13,880
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

7 positive · 5 caution
Best for

Roofs where every square metre counts, small roofs that need every watt and weight-limited structures.

Not ideal for

Hot climates.

Strengths
203.1 watts per square metre

Top 15% of the PERC 350-400 W segment, against a median of 199.0.

20.30% module efficiency

Top 16% of the PERC 350-400 W segment, against a median of 19.90%.

52.7 kg per kWp

Top 20% of the PERC 350-400 W segment, against a median of 55.8.

Watch-outs
-0.390 %/°C temperature coefficient

Bottom 3% of the PERC 350-400 W segment, against a median of -0.350. Ranked 13,579th in the whole database.

What owners get
Half-cut technology reduces power loss

Splitting cells into halves lowers internal resistance and reduces the hot-spot effect under partial shading, resulting in a more stable energy yield compared to classic full-cell modules in the same PERC class.

Peak efficiency of 20.3% matches segment leaders

The top end of the efficiency range (20.3%) matches the best-performing peer, Selfa SV120M.3.2 (20.3%), and exceeds Solitek SOLID Bifacial (19.57%), though the lower bound of 19.2% shows this figure applies only to the highest-power variants in the series.

Compact 120-cell format

The 120-cell layout (rather than 144 or 60) offers a favorable power-to-area ratio, making the module easier to install on residential roofs with limited available surface.

Solid low-irradiance performance

Monocrystalline PERC cells make more efficient use of diffuse radiation than older polycrystalline technology, which is practically relevant for Poland's autumn-winter conditions with frequent low light intensity.

Trade-offs
Model discontinued from production

According to the ENF Solar Panel Directory, the RL350-370HM-120 series is no longer actively manufactured by Ningbo Rarlon Photovoltaic Technology, implying limited unit availability, potential warranty-service gaps, and lack of replacement parts over the module's long operational life (25-30 years).

PERC technology, not N-type TOPCon/HJT

Unlike newer N-type cell generations (TOPCon, HJT) now offered by many Tier-1 manufacturers, PERC exhibits a higher LID degradation coefficient and weaker temperature coefficient, meaning lower annual yield in hot months at comparable nominal power.

No confirmed BNEF Tier 1 status

The manufacturer does not appear on BNEF Tier 1 lists for PV module suppliers, unlike the established European brands in the peer set (Solarwatt, Solitek), which may reduce lender and insurer confidence when financing commercial installations.

No bifacial variant available

The series is single-sided only (is_bifacial: false), while the comparable Solitek SOLID Bifacial model at the same maximum power (370 Wp) offers additional rear-side energy gain unavailable in the RL350HM-370HM-120.

Notes from the database
  • Efficiency of 20.3% is 0.9pp above the PERC 0-400W median (19.4%)
  • 203.1 W/m² power density - 8.7 W/m² more than PERC 0-400W median (194.4 W/m²), more power per roof area
  • -0.39%/°C temperature coefficient - 0.03pp worse than PERC 0-400W median (-0.36%/°C), expect higher hot weather losses
  • At 19.5 kg, weight matches the PERC 0-400W median
  • In the top 84% for efficiency among all PERC panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 370 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 20.30 % Strong Segment median 19.90%
Vmpp · Impp 34.10 V · 10.86 A Operating point at max power
Voc · Isc 41.30 V · 11.37 A Sizes the string length
Dimensions 1755×1038×35 mm · 1.82 m² of roof
Weight 19.5 kg Strong Strong · 1.9 kg below median
Cells 120 · PERC Monocrystalline
Coefficient Pmax -0.390 %/°C Weak bottom 3% of its segment
Coefficient Voc · Isc -0.290 · 0.050 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient

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
-0.390 %/°C against a segment median of -0.350
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Rarlon PV Tech RL370HM-120 370 W 20.30% -0.390 19.5 kg You are here
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, lighter, +2.8 pp
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, lighter, +2.8 pp
GKA210M320W 320 W 23.00% - 16.2 kg -50 W, lighter, +2.7 pp
GKA210M340W 340 W 23.00% - 16.2 kg -30 W, lighter, +2.7 pp
GKA210M360W 360 W 23.00% - 16.2 kg -10 W, lighter, +2.7 pp
GKA210M380W (1/4*4*38) 380 W 23.00% - 17.1 kg +10 W, lighter, +2.7 pp
GKA210M400W (1/2*4*20) 400 W 23.00% - 18.0 kg +30 W, lighter, +2.7 pp
GKA210M400W (1/4*4*40) 400 W 23.00% - 18.0 kg +30 W, lighter, +2.7 pp
GKA210M380W (1/2*4*19) 380 W 23.00% - 17.1 kg +10 W, lighter, +2.7 pp
SPR-MAX3-400-COM 400 W 22.60% -0.270 19.0 kg +30 W, cooler, +2.3 pp
RL350HM-120 350 W 19.20% -0.390 19.5 kg -20 W, -1.1 pp
RL355HM-120 355 W 19.50% -0.390 19.5 kg -15 W, -0.8 pp
RL360HM-120 360 W 19.80% -0.390 19.5 kg -10 W, -0.5 pp
RL365HM-120 365 W 20.00% -0.390 19.5 kg -0.3 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +140 W, cooler, +4.7 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +125 W, cooler, +4.5 pp

Found 210 panels of the same or similar size to this one, within ±10 mm. See them here Found 271 panels of the same or similar size to this one, within ±25 mm. See them here Found 332 panels of the same or similar size to this one, within ±50 mm. See them here Found 4151 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
Do Rarlon RL350HM-370HM-120 panels perform better than standard modules under partial roof shading?
Yes, the half-cut cell technology used in this series directly improves system performance under shading conditions. Splitting each cell in half reduces the current in every sub-string, resulting in noticeably lower resistive losses compared to conventional modules. When shade falls on part of the panel surface — from a chimney, dormer, or antenna — the module loses significantly less power than a standard 60-cell module would.
What warranty does the Rarlon RL350HM-370HM-120 series come with?
Manufacturer Ningbo Rarlon Photovoltaic Technology provides a product warranty covering manufacturing defects, along with a long-term linear power output warranty — typically 25 years with at least 80% of rated power retained. The RL350HM-370HM-120 series aligns with this standard for PERC-class modules. Exact warranty terms should be confirmed with the local distributor, as details may vary depending on the commercial agreement.
Will the RL350HM-370HM-120 series perform well on a Polish rooftop in autumn and winter?
Yes. Monocrystalline PERC cells have a favorable temperature coefficient, meaning that on cold, sunny days the modules actually achieve higher efficiency than during hot summer conditions. The half-cut cell design reduces losses in diffuse light, which is prevalent during Polish autumn and winter. Modules in this class are engineered to withstand snow load and high wind pressure, making them a solid choice for Central European climate conditions.
How many cells does the Rarlon RL350HM-370HM-120 panel have, and does it matter for small roof installations?
The series uses 120 half-cut cells — equivalent to 60 full cells split using half-cut technology. This configuration delivers an excellent power-to-size ratio: at a maximum output of 370 W, the module remains compact. That makes it easier to optimize panel placement on roofs with limited or irregular surface area, which is common in Polish single-family residential construction and mid-sized commercial installations.
Why are the Rarlon RL350HM-370HM-120 panels not bifacial, and is it worth paying extra for a bifacial module?
The RL350HM-370HM-120 series is a monofacial module with PERC cells — a proven and cost-effective design. Bifacial panels generate additional yield from light reflected off the ground, but they are most beneficial in ground-mount systems or flat-roof installations with a light-colored surface. On a typical sloped roof covered with roof tiles, the energy production difference between monofacial and bifacial is often marginal, making the RL350HM-370HM-120 a practical, cost-efficient choice.
Are the Rarlon RL350HM-370HM-120 panels compatible with popular inverters available in Poland?
Yes. The electrical parameters of this series — maximum power of 370 W and standard open-circuit voltage and MPPT voltage ranges — are compatible with inverters widely available on the Polish market, such as SMA, Fronius, Huawei SUN2000, and SolarEdge. Before purchasing, it is advisable to verify with your installer that the planned string configuration fits within the input voltage range and MPPT power rating of the selected inverter.
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