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Resun Solar RS7K-355M
Resun Solar Brand review

RS7K-355M

355 Wp Monocrystalline
ComparePV verdict

Middle of its segment, modest efficiency

Rank 12,578 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)
19.0
Typical · median 21.6 kg
Warranty (yrs)
30
Typical · median 30 yrs

The RS7K-M FULL BLACK series consists of monocrystalline modules designed for installations where aesthetics matter just as much as performance. The panels use half-cut cell technology, where cells are split in half to reduce internal power loss and dissipate heat more effectively, resulting in noticeably better resistance to hot-spot effects caused by partial shading - a common issue on residential roofs with chimneys or antennas. In addition, the multi-busbar (9BB) cells lower the risk of micro-cracks and interrupted current paths, boosting the module's long-term reliability. The distinctive full black design - black frame, black backsheet and a uniform, sleek look - makes these panels a natural fit for residential roofs, where visual appearance plays a real role in the homeowner's decision. High-transmittance tempered glass improves performance under low-light conditions, while the construction offers high mechanical strength against wind and snow loads, along with resistance to salt mist and ammonia. The series is backed by a 30-year linear power warranty, making it a solid choice for prosumer installations that prioritize durability and aesthetics alike.

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 53.5 54.2 Typical 7,492
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, shaded-installations and BIPV.

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%)
  • 194.9 W/m² power density is 23.2 W/m² below database median (218.1 W/m²) - requires larger installation area
  • Temperature coefficient of -0.34%/°C is 0.04pp worse than database median (-0.30%/°C) - higher losses in summer heat
  • 19.0 kg weight - 7.5 kg lighter than database median (26.5 kg), reducing installation effort
  • Ranked #12663 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 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 1755×1038×30 mm · 1.82 m² of roof
Weight 19.0 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-355M 355 W 19.50% -0.340 19.0 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
Are Resun RS7K-M FULL BLACK panels still available for purchase?
The RS7K-M FULL BLACK series has been discontinued by Resun Solar and is no longer in active production. Panels may still be available through distributors while stock lasts, but the manufacturer does not plan to resume production. We recommend checking current stock availability with your supplier and considering newer full black series from Resun as an alternative.
What warranty comes with RS7K-M FULL BLACK modules?
The manufacturer provides a 12-year product warranty covering material and workmanship defects, along with a 30-year linear power warranty guaranteeing sustained high performance throughout the panel's lifetime. This is comparable to top-tier series currently on the market, even though this particular series has been discontinued.
How does half-cut cell technology in the RS7K-M differ from full-size cells?
In half-cut technology, each silicon cell is cut into two halves, reducing internal current losses and lowering the module's operating temperature. This makes the RS7K-M FULL BLACK more resilient to partial shading, such as from a chimney or antenna, and less prone to hot-spot effects compared to modules using full-size cells.
Is the RS7K-M FULL BLACK suitable for residential rooftops in terms of appearance?
Yes, this is one of the series' main advantages. The black frame and black cell backing create a uniform, sleek look without visible silver elements, making it a popular choice for prosumer installations where the roof's aesthetics matter to the homeowner, such as on visible single-family house roofs.
What is the maximum power output of the RS7K-M FULL BLACK, and how many panels are needed for a typical 5 kWp system?
The panel reaches a maximum power output of 380 Wp. To build a system of roughly 5 kWp, you would need about 13 modules. Thanks to half-cut technology and 9BB cells, the panels maintain stable performance even under partial sunlight, which is worth factoring into the layout design on the roof.
Do the 9BB multi-busbar cells in the RS7K-M improve panel durability?
Yes, 9BB (nine busbar) technology distributes current across more pathways on the cell surface, reducing the risk of microcracks and circuit interruption from minor mechanical damage. In practice, this translates to higher long-term reliability, especially under harsher climate conditions such as significant temperature swings.
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