Warranty pick, weak in heat
The RSM-100P-EX series consists of compact 100W polycrystalline modules designed for small on-grid installations, mobile systems, and applications where predictable output matters within limited mounting space. The panels feature an anti-reflective, hydrophobic coating that improves light absorption and reduces dust buildup on the surface, helping the module maintain high efficiency without frequent cleaning. Built on 36 cells with 5 busbars, the construction delivers stable electrical parameters, and the manufacturer guarantees a positive power output tolerance of 0/+5W, removing the risk of underestimating actual energy yield. The series delivers strong performance in low-light conditions, translating into real energy gains during mornings, evenings, and overcast days. A reinforced anodized aluminum frame and 3.2mm tempered glass provide resistance to high wind and snow loads, making the panels suitable for demanding climates, including coastal, desert, and lakeside environments. An additional advantage is the 30-year linear power warranty with an annual degradation rate of just 0.5%, contributing to a lower LCOE over the full lifetime of the installation.
Ranking
Signals from the data
Off-grid.
Hot climates.
Top 18% of the 0-200 W band, against a median of 25 yrs.
Bottom 17% of the 0-200 W band, against a median of -0.370.
The manufacturer guarantees only a positive deviation from rated output, removing the risk of receiving modules underperforming the nameplate rating - unlike many competing series with a ±3% tolerance band.
A 0.5% annual degradation rate combined with a 30-year power warranty matches offerings from flagship tier-1 series and significantly exceeds the standard 25-year term common among polycrystalline modules in this power class.
The additional surface coating reduces light reflection and dust accumulation, improving real-world energy yield and lowering maintenance frequency - valuable for mobile and hard-to-access installations.
An anodized aluminum frame and 3.2 mm tempered glass deliver high mechanical resistance, making the series suitable for coastal, desert, and heavy snow-load environments.
Resun Solar has operated since 2007, which in the small-format 100W segment (often dominated by brands with limited track record) provides greater confidence in long-term warranty fulfillment.
Efficiency of 14.7-15.44% trails comparable 100W modules: TPL Solar TPL S-36 (15.67%), Easun Power Flexible (19.63%), and monocrystalline JA Solar (21.29%). At equal power, this means a larger module footprint is needed for the same energy yield.
The 100W segment is shifting toward monocrystalline cells (as used in peer comparables JA Solar and Easun Power), which offer higher efficiency and better high-temperature performance than the 36 polycrystalline cells used here.
- At 15.4% efficiency, this panel is 6.4pp below the database median of 21.8%
- At 146.3 W/m², this panel generates 71.8 W/m² less per unit area than database median (218.1 W/m²)
- -0.39%/°C temperature coefficient - 0.09pp worse than database median (-0.30%/°C), expect higher hot weather losses
- 7.0 kg weight - 19.5 kg lighter than database median (26.5 kg), reducing installation effort
- Ranked #13853 out of 14129 panels for efficiency in the database
Specifications
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
Alternatives
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About the RSM-100P series
These answers cover the whole series. Where a figure differs, the specification above is this module's own.