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Runtech China Brand review

RT 355M

355 Wp Polycrystalline
ComparePV verdict

Middle of its segment, weak in heat

Rank 13,110 of 14,005
Compare panels Datasheet PDF
Power (Wp)
355
Weak · bottom 16%
Efficiency (%)
18.49
Weak · bottom 12%
Density (Wp/m²)
182.6
Weak · bottom 11%
Temp (%/°C)
-0.410
Weak · bottom 3%
Weight (kg)
22.4
Weak · bottom 15%
Warranty (yrs)
25
Weak · bottom 22%

The Runtech China RT-340|345|350|355P series is designed for stable energy production under real operating conditions, even when solar irradiance is weaker or variable. The modules utilize polycrystalline solar cells in a high-section configuration, which helps minimize losses and improve predictability in typical roof and ground-mounted installations.

In practice, they stand out due to their refined design: IP67-rated junction box provides protection against moisture and harsh weather, while tempered glass and a robust frame make installation and daily operation easy. Another key advantage of this series is its high mechanical resistance to snow and wind loads, which is important in the Polish climate.

It is a good choice for investors who want to build a reliable and easy-to-maintain system, from single-family homes to larger systems on commercial buildings and in commercial projects.

Ranking

4,944 panels in the 255-455 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 18.49% 20.80% Weak · bottom 12% 13,117
Power density 182.6 207.9 Weak · bottom 11% 13,144
Temperature coefficient -0.410 -0.335 Weak · bottom 3% 13,738
Weight per kWp 63.1 54.2 Weak · bottom 15% 12,849
Performance warranty 25 yrs 30 yrs Weak · bottom 22% 9,798
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 3 caution
Best for

Residential and commercial.

Not ideal for

Hot climates, roofs where every square metre has to count and tight roof space.

Watch-outs
-0.410 %/°C temperature coefficient

Bottom 3% of the 255-455 W band, against a median of -0.335. Ranked 13,738th in the whole database.

182.6 watts per square metre

Bottom 11% of the 255-455 W band, against a median of 207.9.

18.49% module efficiency

Bottom 12% of the 255-455 W band, against a median of 20.80%.

Notes from the database
  • Module efficiency of 18.5% is 3.3pp below average for database panels (median: 21.8%)
  • 182.6 W/m² power density is 35.5 W/m² below database median (218.1 W/m²) - requires larger installation area
  • Temperature coefficient of -0.41%/°C is 0.11pp worse than database median (-0.30%/°C) - higher losses in summer heat
  • Weight of 22.4 kg (4.1 kg below database median of 26.5 kg) allows easier transport and roof mounting
  • Ranked #13117 out of 14005 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 355 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 18.49 % Weak Segment median 20.80%
Vmpp · Impp 38.90 V · 9.30 A Operating point at max power
Voc · Isc 46.50 V · 9.84 A Sizes the string length
Max system voltage 1000 V Longer strings than 1000 V modules
Dimensions 1960×992×35 mm · 1.94 m² of roof
Weight 22.4 kg Weak Weak · bottom 15%
Cells 144 Polycrystalline
Coefficient Pmax -0.410 %/°C Weak bottom 3% of its segment
Coefficient Voc · Isc -0.310 · 0.053 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 10 years Hardware defects only
Performance warranty 25 years Weak bottom 22% · median 30 yrs

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
-0.410 %/°C against a segment median of -0.335
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Runtech China RT 355M 355 W 18.49% -0.410 22.4 kg You are here
LNSK-340M 340 W 20.08% -0.360 21.0 kg -15 W, cooler, +1.6 pp
LNSU-405M 405 W 20.06% -0.360 24.5 kg +50 W, cooler, +1.6 pp
CS3K-330P 330 W 19.90% -0.360 18.5 kg Cooler, lighter, +1.4 pp
CS3K-335MB-AG 335 W 19.90% -0.360 22.3 kg Cooler, +1.4 pp, +5 yr warranty
CS3U-395P 395 W 19.90% -0.360 22.5 kg +40 W, cooler, +1.4 pp
LNSU-400M 400 W 19.81% -0.360 24.5 kg +45 W, cooler, +1.3 pp
LNSK-335M 335 W 19.78% -0.360 21.0 kg -20 W, cooler, +1.3 pp
LNSF-400M 400 W 19.76% -0.360 23.5 kg +45 W, cooler, +1.3 pp
RT-340M 340 W 17.49% -0.410 22.4 kg -15 W, -1.0 pp
RT-345M 345 W 17.70% -0.410 22.4 kg -10 W, -0.8 pp
RT-350M 350 W 18.03% -0.410 22.4 kg -0.5 pp
SPR-MAX7-475 475 W 24.00% -0.270 21.1 kg Cooler, +5.5 pp, +15 yr warranty
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg Cooler, +5.2 pp, +15 yr warranty
SPR-MAX7-465 465 W 23.50% -0.270 21.1 kg Cooler, +5.0 pp, +15 yr warranty
SPR-MAX6-440 440 W 22.80% -0.290 20.9 kg Cooler, +4.3 pp, +15 yr warranty
SPR-MAX6-435 435 W 22.50% -0.290 20.9 kg Cooler, +4.0 pp, +15 yr warranty

Found 163 panels of the same or similar size to this one, within ±10 mm. See them here Found 243 panels of the same or similar size to this one, within ±25 mm. See them here Found 434 panels of the same or similar size to this one, within ±50 mm. See them here Found 550 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
Is the Runtech RT-340|345|350|355P series still available for purchase?
The RT-340|345|350|355P series has been discontinued and is no longer actively offered by the manufacturer. If you need similar specifications — output in the 340–355 Wp range with polycrystalline cell technology — it is worth asking your distributor about available alternatives or newer modules from the same manufacturer.
What warranty does the Runtech RT-355P solar panel carry?
The manufacturer provides a 10-year product warranty covering material and workmanship defects, along with a 25-year linear power output warranty. This means the panel is guaranteed to maintain a specified minimum power level relative to its nominal rating over 25 years — a standard warranty scope for this class of polycrystalline modules.
Can the RT-340|345|350|355P panels handle heavy snow loads and wind typical of Polish winters?
Yes, the series features enhanced mechanical resistance to snow and wind loads, making it well suited for the Polish climate. Tempered glass and a robust aluminum frame protect the module against deflection under snow accumulation. Exact allowable static load values (typically 5400 Pa snow / 2400 Pa wind) should be confirmed in the current datasheet.
Are the RT-350P modules suitable for a pitched roof on a single-family home?
Yes, the RT-340|345|350|355P series is designed for both rooftop and ground-mounted installations. The IP67-rated junction box provides moisture resistance appropriate for rooftop exposure. The modules perform well on pitched roofs at a standard tilt of 30–40°, though final sizing requires a structural engineering assessment of roof loads and racking compatibility.
How do Runtech RT-355P panels perform under cloudy skies or low irradiance?
The RT-340|345|350|355P series is optimized for stable energy production under variable irradiance conditions — common in the Polish climate. The multi-section polycrystalline cell layout helps reduce losses under partial shading and diffuse light. These are not bifacial modules, so they do not capture reflected irradiance from the ground surface.
Are the polycrystalline cells in the RT-355P an outdated technology?
Polycrystalline (poly) cells are a mature, proven technology with slightly lower efficiency than newer monocrystalline PERC or TOPCon modules, but also lower manufacturing costs. For ground-mounted systems or large rooftops where space is not a constraint, the efficiency difference rarely becomes a deciding factor. The RT-355P series is a solid choice for conventional prosumer installations, though newer mono modules deliver better yield per square meter.
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