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Resun Solar Brand review

RSM090P

90 Wp Polycrystalline
ComparePV verdict

Warranty pick, weak in heat

Rank 13,834 of 14,005
Compare panels Datasheet PDF
Power (Wp)
90
Weak · bottom 9%
Efficiency (%)
14.80
Typical · median 15.65%
Density (Wp/m²)
148.3
Typical · median 156.1
Temp (%/°C)
-0.390
Weak · bottom 17%
Weight (kg)
6.4
Typical · median 10.8 kg
Warranty (yrs)
30
Strong · top 16%

The RSM090P series is a compact polycrystalline panel built from 36 solar cells, designed for off-grid applications where reliability matters most within a limited mounting footprint. It suits island systems, water pumping setups, solar lighting, and small battery-charging installations where standard high-power modules are oversized or impractical to manage. The panel stands out with its positive power output tolerance, ensuring real-world performance never falls below the rated value, which reduces the risk of undersizing a system at the design stage. Its anti-reflective, hydrophobic coating improves light absorption and helps the surface self-clean, resulting in more stable output even in dusty conditions. The construction delivers high resistance to wind and snow loads, while the anodized aluminum frame and tempered glass make the module well suited to harsh environments such as coastal areas, desert regions, and locations near bodies of water. It also performs well under low-light conditions, which matters during mornings, evenings, and overcast days. The series combines simplicity, compact dimensions, and predictable durability, making it a practical choice for installers seeking a proven solution for smaller, standalone photovoltaic systems.

Ranking

201 panels in the 0-190 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 14.80% 15.65% Typical 13,845
Power density 148.3 156.1 Typical 13,825
Temperature coefficient -0.390 -0.370 Weak · bottom 17% 13,579
Weight per kWp 71.1 72.2 Typical 13,458
Performance warranty 30 yrs 25 yrs Strong · top 16% 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

1 positive · 1 caution
Best for

Off-grid.

Not ideal for

Hot climates.

Strengths
30 year performance warranty

Top 16% of the 0-190 W band, against a median of 25 yrs.

Watch-outs
-0.390 %/°C temperature coefficient

Bottom 17% of the 0-190 W band, against a median of -0.370.

Notes from the database
  • Module efficiency of 14.8% is 7.0pp below average for database panels (median: 21.8%)
  • 148.3 W/m² power density is 69.8 W/m² below database median (218.1 W/m²) - requires larger installation area
  • -0.39%/°C temperature coefficient - 0.09pp worse than database median (-0.30%/°C), expect higher hot weather losses
  • 6.4 kg weight - 20.1 kg lighter than database median (26.5 kg), reducing installation effort
  • #13845 for efficiency, #13579 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 90 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 14.80 % Typical Segment median 15.65%
Vmpp · Impp 18.87 V · 4.77 A Operating point at max power
Voc · Isc 22.60 V · 5.22 A Sizes the string length
Max system voltage 1000 V Longer strings than 1000 V modules
Dimensions 906×670×30 mm · 0.61 m² of roof
Weight 6.4 kg Typical Typical · median 10.8 kg
Cells 36 Polycrystalline
Coefficient Pmax -0.390 %/°C Weak bottom 17% 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 16% · 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 RSM090P 90 W 14.80% -0.390 6.4 kg You are here
WS-135 /12V 135 W 15.87% -0.386 13.0 kg Heavier, +1.1 pp, -20 yr warranty
WS-110 /12V 110 W 15.75% -0.386 9.0 kg Heavier, +0.9 pp, -20 yr warranty
RSM080P 80 W 15.50% -0.390 5.7 kg -10 W, +0.7 pp
WS-130 /12V 130 W 15.29% -0.386 13.0 kg +40 W, heavier, -20 yr warranty
WS-105 /12V 105 W 15.03% -0.386 9.0 kg +15 W, heavier, -20 yr warranty
GKA182M150W 150 W 23.00% - 9.0 kg +60 W, heavier, +8.2 pp
GKA182M135W 135 W 23.00% - 6.1 kg +45 W, +8.2 pp
YH120W-18M 120 W 19.63% -0.350 6.4 kg +30 W, cooler, +4.8 pp
YH120W-18M 120 W 19.63% -0.350 6.4 kg +30 W, cooler, +4.8 pp
YH115W-18M 115 W 18.81% -0.350 6.4 kg +25 W, cooler, +4.0 pp
YH115W-18M 115 W 18.81% -0.350 6.4 kg +25 W, cooler, +4.0 pp
LKS-5M-115 115 W 17.20% - 6.8 kg +25 W, +2.4 pp
DLXN-M10-100W 100 W 17.00% -0.410 5.8 kg +10 W, hotter, +2.2 pp
DLXN-M10-100W 100 W 17.00% -0.410 5.8 kg Hotter, +2.2 pp, -20 yr warranty
LKS-5M-110 110 W 16.50% - 6.8 kg +20 W, +1.7 pp

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Common questions

6 answered
What are the best applications for the Resun Solar RSM090P 90W panel?
The RSM090P is a compact 90 Wp polycrystalline panel designed for off-grid applications: island systems, solar water pumps, street lighting, and small battery charging setups. Its small footprint and low unit power make it a practical choice where standard 400W+ modules would be oversized or costly to handle on limited mounting surfaces.
What warranty comes with the RSM090P series?
The manufacturer provides a 12-year product warranty covering material and workmanship defects, along with a 30-year power output warranty, which is above average for polycrystalline panels in this class. This warranty length reflects predictable long-term durability and stable energy output over the lifetime of an off-grid installation.
What does positive power tolerance mean on the RSM090P, and does it matter for system design?
Positive power tolerance means the actual output of the module never falls below its rated 90 Wp, and can slightly exceed it. For installers, this is a practical advantage: when sizing an off-grid system, you can plan more safely without worrying about the array underperforming relative to the energy balance assumptions used in the design.
Does the RSM090P perform well in low-light conditions, such as early morning or overcast days?
Yes, the panel is optimized for stable performance under low irradiance, resulting in better energy production in the early morning, evening, and on cloudy days compared to modules without this optimization. This matters especially in off-grid systems, where every additional hour of energy production directly affects power availability for connected loads.
How wind and snow load resistant is the RSM090P, and where can it be installed?
An anodized aluminum frame combined with tempered glass gives the panel high mechanical resistance to wind and snow loads, making it suitable for demanding environments such as coastal areas, desert regions, and locations near bodies of water. The anti-reflective and hydrophobic coating also promotes self-cleaning, reducing the impact of dust buildup on performance.
Is the Resun Solar RSM090P a bifacial panel?
No, the RSM090P is a monofacial panel built on standard 36-cell polycrystalline technology. At this power class and intended use case—off-grid systems and small autonomous installations—bifacial technology is rarely applied, since its benefits mainly emerge in larger installations with mounting configurations that capture reflected light from the ground.
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