--- title: "Resun Solar RSM090P 90W Solar Panel - Specs & Review | ComparePV" description: "Resun Solar RSM090P 90W solar panel. Specs: 14.80% efficiency, Polycrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/resun-solar-rsm090p" updated: 2026-09-11 --- # Resun Solar RSM090P Warranty pick, weak in heat 201 panels in the 0-190 W band, all technologies ## Identity - **Manufacturer:** Resun Solar - **Model:** RSM090P - **Series:** RSM090P - **Rated power:** 90 W - **Cell technology:** Polycrystalline ## How it compares Compared against 0-190 W band, all technologies (201 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 90 W | 135 W | Weak - bottom 9% | | | 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 (kg) | 6.4 kg | 10.8 kg | Typical | | | Performance warranty | 30 yrs | 25 yrs | Strong - top 16% | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | 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 | ### Strengths - **30 year performance warranty** - Top 16% of the 0-190 W band, against a median of 25 yrs. ### Watch out for - **-0.390 %/°C temperature coefficient** - Bottom 17% of the 0-190 W band, against a median of -0.370. - **Best for:** Off-grid. - **Not ideal for:** Hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 90 W - **Efficiency:** 14.80 % - **Voltage at Pmax (Vmp):** 18.87 V - **Current at Pmax (Imp):** 4.77 A - **Open-circuit voltage (Voc):** 22.60 V - **Short-circuit current (Isc):** 5.22 A - **Max system voltage:** 1000 V ### Temperature - **Temperature coefficient of Pmax:** -0.390 %/degC - **Temperature coefficient of Voc:** -0.320 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Polycrystalline - **Cell count:** 36 ### Physical - **Length:** 906 mm - **Width:** 670 mm - **Thickness:** 30 mm - **Weight:** 6.4 kg - **Area:** 0.61 m2 - **Power density:** 148.3 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Annual degradation:** 0.50 % - **Output after 30 years:** 76 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 13845 of 14005 | | Power density | 13825 of 14005 | | Temperature coefficient | 13579 of 14005 | | Weight | 13458 of 14005 | | Warranty | 21 of 14005 | ## About this series 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. ## Notable figures - 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 ## Questions ### 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. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/RSM090P-99b00c18e513.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Waaree WS-135 /12V](https://comparepv.com/panel/waaree-ws-135-12v) | 135 W | Heavier, +1.1 pp, -20 yr warranty | | [Waaree WS-110 /12V](https://comparepv.com/panel/waaree-ws-110-12v) | 110 W | Heavier, +0.9 pp, -20 yr warranty | | [Resun Solar RSM080P](https://comparepv.com/panel/resun-solar-rsm080p) | 80 W | -10 W, +0.7 pp | | [Waaree WS-130 /12V](https://comparepv.com/panel/waaree-ws-130-12v) | 130 W | +40 W, heavier, -20 yr warranty | | [Waaree WS-105 /12V](https://comparepv.com/panel/waaree-ws-105-12v) | 105 W | +15 W, heavier, -20 yr warranty | | [Gamko New Energy GKA182M150W](https://comparepv.com/panel/gamko-new-energy-gka182m150w) | 150 W | +60 W, heavier, +8.2 pp | | [Gamko New Energy GKA182M135W](https://comparepv.com/panel/gamko-new-energy-gka182m135w) | 135 W | +45 W, +8.2 pp | | [Renesola YH120W-18M](https://comparepv.com/panel/renesola-yh120w-18m) | 120 W | +30 W, cooler, +4.8 pp | | [Isola New Energy YH120W-18M](https://comparepv.com/panel/isola-new-energy-yh120w-18m) | 120 W | +30 W, cooler, +4.8 pp | | [Renesola YH115W-18M](https://comparepv.com/panel/renesola-yh115w-18m) | 115 W | +25 W, cooler, +4.0 pp | | [Isola New Energy YH115W-18M](https://comparepv.com/panel/isola-new-energy-yh115w-18m) | 115 W | +25 W, cooler, +4.0 pp | | [LinkSol LKS-5M-115](https://comparepv.com/panel/linksol-lks-5m-115) | 115 W | +25 W, +2.4 pp | | [Longi Solar DLXN-M10-100W](https://comparepv.com/panel/longi-solar-dlxn-m10-100w) | 100 W | +10 W, hotter, +2.2 pp | | [Wanze Energy DLXN-M10-100W](https://comparepv.com/panel/wanze-energy-dlxn-m10-100w) | 100 W | Hotter, +2.2 pp, -20 yr warranty | | [LinkSol LKS-5M-110](https://comparepv.com/panel/linksol-lks-5m-110) | 110 W | +20 W, +1.7 pp | --- Source: https://comparepv.com/panel/resun-solar-rsm090p Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.