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Resun Solar RS7K-M-355W
Resun Solar Brand review

RS7K-M-355W

355 Wp Monocrystalline
ComparePV verdict

Middle of its segment, modest efficiency

Rank 12,588 of 14,005
Compare panels Datasheet PDF
Power (Wp)
355
Weak · bottom 16%
Efficiency (%)
19.50
Weak · bottom 19%
Density (Wp/m²)
194.9
Weak · bottom 19%
Temp (%/°C)
-0.340
Typical · median -0.335
Weight (kg)
19.5
Typical · median 21.6 kg
Warranty (yrs)
30
Typical · median 30 yrs

The RS7K-M series from Resun Solar is built with half-cut mono cell technology and 9BB busbars, designed for installations where both stable energy output and long-term reliability matter. The use of multi-busbar technology reduces internal power loss and lowers the risk of failure caused by microcracks and broken busbars, resulting in greater panel durability under demanding operating conditions. By splitting the cells in half, the module offers significantly improved resistance to hot-spot effects caused by shading, an important advantage for roof installations with partial shading from chimneys or trees. The panels feature high PID resistance, translating into higher energy yield over the system's lifetime and a lower LCOE. Tempered 3.2mm glass with an anti-reflective coating delivers solid low-light performance, while certified resistance to high wind and snow loads makes the series suitable for demanding climate zones. The aesthetic full black version makes RS7K-M a fitting choice for both commercial projects and residential rooftops, where the visual appearance of the installation matters just as much as its performance.

Ranking

4,944 panels in the 255-455 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 19.50% 20.80% Weak · bottom 19% 12,663
Power density 194.9 207.9 Weak · bottom 19% 12,667
Temperature coefficient -0.340 -0.335 Typical 8,778
Weight per kWp 54.9 54.2 Typical 9,311
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 2 caution
Best for

Residential, commercial and shaded-installations.

Not ideal for

Tight roof space and roofs where every square metre has to count.

Watch-outs
19.50% module efficiency

Bottom 19% of the 255-455 W band, against a median of 20.80%.

194.9 watts per square metre

Bottom 19% of the 255-455 W band, against a median of 207.9.

Notes from the database
  • Efficiency of 19.5% is 2.3pp below the database median (21.8%)
  • Power density of 194.9 W/m² is 23.2 W/m² below database median (218.1 W/m²) - needs more roof space
  • Temperature coefficient of -0.34%/°C is 0.04pp worse than database median (-0.30%/°C) - higher losses in summer heat
  • 19.5 kg weight - 7.0 kg lighter than database median (26.5 kg), reducing installation effort
  • In the top 90% for efficiency among all N-type panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 355 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 19.50 % Weak Segment median 20.80%
Vmpp · Impp 33.90 V · 10.48 A Operating point at max power
Voc · Isc 40.30 V · 11.31 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1755×1038×35 mm · 1.82 m² of roof
Weight 19.5 kg Typical Typical · median 21.6 kg
Cells 120 Monocrystalline
Coefficient Pmax -0.340 %/°C Typical median -0.335 of its segment
Coefficient Voc · Isc -0.320 · 0.050 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
Degradation 0.50 % Per year after the first

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 -0.335
-

Alternatives

All Resun Solar panels
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Resun Solar RS7K-M-355W 355 W 19.50% -0.340 19.5 kg You are here
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, +3.6 pp, -5 yr warranty
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, +3.6 pp, -5 yr warranty
GKA210M320W 320 W 23.00% - 16.2 kg -35 W, lighter, +3.5 pp
GKA210M340W 340 W 23.00% - 16.2 kg -15 W, lighter, +3.5 pp
GKA210M360W 360 W 23.00% - 16.2 kg Lighter, +3.5 pp
GKA210M380W (1/4*4*38) 380 W 23.00% - 17.1 kg +25 W, lighter, +3.5 pp
GKA210M400W (1/2*4*20) 400 W 23.00% - 18.0 kg +45 W, lighter, +3.5 pp
GKA210M400W (1/4*4*40) 400 W 23.00% - 18.0 kg +45 W, lighter, +3.5 pp
GKA210M380W (1/2*4*19) 380 W 23.00% - 17.1 kg +25 W, lighter, +3.5 pp
SPR-MAX3-400-COM 400 W 22.60% -0.270 19.0 kg Cooler, +3.1 pp, +10 yr warranty
RS7K-360M 360 W 19.80% -0.340 19.0 kg +0.3 pp
RS7K-365M 365 W 20.00% -0.340 19.0 kg +10 W, +0.5 pp
RS7K-370M 370 W 20.30% -0.340 19.0 kg +15 W, +0.8 pp
RS7K-375M 375 W 20.60% -0.340 19.0 kg +20 W, +1.1 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +155 W, cooler, +5.5 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +140 W, cooler, +5.3 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
What is the maximum power output of the RS7K-M series panels and how is it achieved?
The RS7K-M series panels reach a maximum power output of up to 380 Wp. This is achieved through monocrystalline half-cut cells with 9BB (multi-busbar) technology, which reduce resistive losses and increase conversion efficiency compared to older modules with fewer busbars.
What warranty comes with Resun Solar RS7K-M panels?
The manufacturer provides a 12-year product warranty and a 30-year linear power output warranty. This means that after 30 years of operation, the panel should still generate a guaranteed percentage of its initial output, making this series suitable for long-term investments, including commercial installations.
Are RS7K-M panels suitable for roofs partially shaded by chimneys or trees?
Yes, thanks to half-cut cell technology, in which cells are split into halves, the module handles partial shading much better. The cells operate in smaller, independent circuits, which reduces the risk of the hot-spot effect and limits the impact of shading on total energy output.
Do RS7K-M panels perform well in low-light conditions, such as autumn or winter?
Yes, the panels feature 3.2 mm tempered glass with an anti-reflective coating that improves absorption of diffused light in cloudy weather and at low sun angles. This results in more stable energy production during periods of lower solar irradiance, such as autumn and winter.
How does the multi-busbar technology in RS7K-M differ from standard 5BB panels?
The 9BB multi-busbar technology used in RS7K-M increases the number of current-carrying paths on the cell surface compared to older 5BB modules. This reduces internal power losses, lowers the risk of busbar breakage and microcracks, and improves panel durability under demanding operating conditions such as thermal cycling and mechanical stress.
Are RS7K-M panels resistant to heavy snow and wind loads?
Yes, the RS7K-M series has certified resistance to high mechanical loads from snow and wind, confirmed through standard industry testing. This makes the modules suitable for installations in regions with more demanding climate conditions, including areas with heavy winter snowfall.
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