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Resun Solar Brand review

RS7E-225M

225 Wp Monocrystalline
ComparePV verdict

Space saver, weak in heat

Rank 13,197 of 14,129
Compare panels Datasheet PDF
Power (Wp)
225
Typical for its class
Efficiency (%)
20.60
Strong · top 7%
Density (Wp/m²)
206.0
Strong · top 6%
Temp (%/°C)
-0.390
Weak · bottom 25%
Weight (kg)
12.0
Strong · 6.0 kg below median
Warranty (yrs)
30
Strong · top 20%

The RS7E-M series is a compact, all-black monocrystalline module line designed for installations where both aesthetics and reliability under demanding conditions matter. The cells use multi-busbar (9BB) technology, which lowers internal power loss while reducing the risk of microcracks and broken current paths, meaningfully extending the module's service life. Thanks to high-transmittance tempered glass, the module maintains strong low-light performance, a benefit installers will appreciate in regions with variable irradiance. RS7E-M also stands out for its high mechanical strength against wind and snow loads, and it is additionally certified for resistance to salt mist and ammonia, making it a solid choice for coastal, agricultural, or livestock-facility installations. The uniform all-black housing gives the panel a sleek look that blends naturally into modern building architecture and facades where visual appearance counts. Its compact dimensions make it a practical solution wherever standard-size modules don't fit, such as small roofs, carports, or specialty structures. This series is aimed at installers seeking a combination of high reliability, aesthetics, and stable, predictable power output over the long term.

Ranking

690 panels in the 125-325 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 20.60% 16.90% Strong · top 7% 11,172
Power density 206.0 169.0 Strong · top 6% 11,180
Temperature coefficient -0.390 -0.370 Weak · bottom 25% 13,659
Weight per kWp 53.3 66.7 Strong · top 10% 7,243
Performance warranty 30 yrs 25 yrs Strong · top 20% 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

8 positive · 4 caution
Best for

Residential and BIPV.

Not ideal for

Hot climates.

Strengths
206.0 watts per square metre

Top 6% of the 125-325 W band, against a median of 169.0. Ranked 11,180th in the whole database.

20.60% module efficiency

Top 7% of the 125-325 W band, against a median of 16.90%. Ranked 11,172nd in the whole database.

53.3 kg per kWp

Top 10% of the 125-325 W band, against a median of 66.7. Ranked 7,243rd in the whole database.

Watch-outs
-0.390 %/°C temperature coefficient

Bottom 25% of the 125-325 W band, against a median of -0.370.

What owners get
9-busbar (9BB) cell technology

The multi-busbar current-path grid reduces internal resistance and distributes mechanical stress across more solder points, lowering the risk of microcracks and broken current paths compared to older 3BB/5BB designs, translating into more stable power output over the panel's service life.

Salt mist and ammonia resistance certification

Additional IEC 61701 (salt mist) and IEC 62716 (ammonia) testing go beyond the standard certification package, enabling use in coastal and agricultural/livestock installations where frame and connector corrosion is the main lifespan-limiting factor for competing series.

High efficiency up to 21.06%

The upper efficiency bound of 21.06% places this series above comparable Kyocera ECONOROOTS (20.76%) and well above TPL P-54 (16.01%) and JS200W-225W (17.13%), yielding higher energy capture per unit of mounting area.

Compact module footprint

Small physical dimensions at 210-230 Wp enable installation on small roofs, carports, and specialty structures where standard 400+ Wp panels with larger surface areas won't fit.

Uniform all-black aesthetic

Full black framing, backsheet, and cells minimize visual contrast on the roof, a key selling point for facade installations and modern architecture where appearance matters as much as technical specs.

Trade-offs
Low unit power per module

The 210-230 Wp range sits well below current market standards (400-600+ Wp among competitors, including Resun's own RS7K-M series at 355-380 Wp), meaning more modules, connectors, and installation hours per kWp than with modern large-format panels.

No bifacial technology

The module does not use bifacial cells, so it misses out on additional yield from reflected irradiance - a feature increasingly offered even in the compact-panel segment by competing manufacturers.

Standard, not extended product warranty

12 years of product warranty matches the market average of several years ago, while many tier-1 manufacturers now offer 15-25 years of product coverage alongside a comparable 30-year power warranty.

Notes from the database
  • At 20.6% efficiency, this panel is 1.2pp below the database median of 21.8%
  • Power density of 206.0 W/m² is 12.1 W/m² below database median (218.1 W/m²) - needs more roof space
  • -0.39%/°C temperature coefficient - 0.09pp worse than database median (-0.30%/°C), expect higher hot weather losses
  • Weight of 12.0 kg (14.5 kg below database median of 26.5 kg) allows easier transport and roof mounting
  • In the top 79% for efficiency among all N-type panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 225 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 20.60 % Strong Segment median 16.90%
Vmpp · Impp 20.16 V · 11.16 A Operating point at max power
Voc · Isc 24.06 V · 11.76 A Sizes the string length
Max system voltage 1000 V Longer strings than 1000 V modules
Dimensions 1560×700×35 mm · 1.09 m² of roof
Weight 12.0 kg Strong Strong · 6.0 kg below median
Cells 36 Monocrystalline
Coefficient Pmax -0.390 %/°C Weak bottom 25% 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 Strong top 20% · median 25 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
-0.390 %/°C against a segment median of -0.370
-

Alternatives

All Resun Solar panels
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Resun Solar RS7E-225M 225 W 20.60% -0.390 12.0 kg You are here
GKA182M180W 180 W 23.00% - 9.0 kg -45 W, lighter, +2.4 pp
GKA182M200W 200 W 23.00% - 9.0 kg -25 W, lighter, +2.4 pp
GKA182M240W 240 W 23.00% - 10.8 kg +15 W, lighter, +2.4 pp
GKA182M260W 260 W 23.00% - 10.8 kg +35 W, lighter, +2.4 pp
GKA182M270W 270 W 23.00% - 10.8 kg +45 W, lighter, +2.4 pp
DM270M10T-B32HBT 270 W 22.90% -0.290 15.3 kg +45 W, cooler, +2.3 pp
ZEUS 1.2 FullBlack 275W 275 W 22.89% -0.260 14.3 kg +50 W, cooler, +2.3 pp
ZEUS 1.2 FullBlack 270W 270 W 22.47% -0.260 14.3 kg +45 W, cooler, +1.9 pp
RS7E-185P 185 W 16.94% -0.390 12.0 kg -40 W, -3.7 pp
RS7E-190P 190 W 17.40% -0.390 12.0 kg -35 W, -3.2 pp
RS7E-195P 195 W 17.86% -0.390 12.0 kg -30 W, -2.7 pp
RS7E-200P 200 W 18.32% -0.390 12.0 kg -25 W, -2.3 pp
RS7E-205P 205 W 18.77% -0.390 12.0 kg -20 W, -1.8 pp
RS7E-210M 210 W 19.23% -0.390 12.0 kg -15 W, -1.4 pp
RS7E-215M 215 W 19.69% -0.390 12.0 kg -10 W, -0.9 pp
RS7E-220M 220 W 20.15% -0.390 12.0 kg -0.5 pp
ZEUS 1.2 FullBlack 280W 280 W 23.31% -0.260 14.3 kg +55 W, cooler, +2.7 pp

Found 18 panels of the same or similar size to this one, within ±10 mm. See them here Found 18 panels of the same or similar size to this one, within ±25 mm. See them here Found 29 panels of the same or similar size to this one, within ±50 mm. See them here Found 142 panels of the same or similar size to this one, within ±100 mm. See them here

About the RS7E-M series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this module's own.

What is the maximum power output of the Resun Solar RS7E-M panel?
The RS7E-M series reaches a maximum power output of up to 230 Wp. Due to its compact size, this is a low unit power compared to standard 400-600 Wp panels, but the module is designed for small surfaces where power density on limited space matters more than maximizing total system output.
Is the RS7E-M suitable for small roofs or carports where standard panels don't fit?
Yes, this is one of the series' main applications. The module's compact dimensions allow it to fit on small roofs, carports, garages, or specialized structures where standard, larger solar panels simply won't fit or can't efficiently use the available space.
What warranty comes with Resun Solar RS7E-M panels?
The manufacturer provides a 12-year product warranty along with a 30-year linear power output warranty. This means the module maintains its declared, predictable performance throughout that period, giving long-term investment security for specialized and aesthetic installations.
What does 9BB technology do in the RS7E-M and does it matter in practice?
Multi-busbar (9BB) technology reduces internal power losses within the cell and lowers the risk of microcracks and current path interruptions. In practice, this translates to a longer panel lifespan and reduced performance degradation over time, even under less-than-ideal handling or mounting conditions.
Is the RS7E-M corrosion-resistant and suitable for coastal or agricultural installations?
Yes, the module is certified for salt mist and ammonia resistance, confirming its durability in aggressive environments. This makes the RS7E-M a good fit for coastal installations, agricultural sites, and livestock buildings, where standard panels would corrode faster.
Does the RS7E-M look good on a facade with its all-black housing?
Yes, the module features a uniform, all-black housing with no visible contrasting frame elements. This appearance blends well with modern building architecture and facades, where the aesthetics of a solar installation are just as important as its technical specifications.
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