--- title: "Resun Solar RS8I-540M-BD 540W Solar Panel - Specs & Review | ComparePV" description: "Resun Solar RS8I-540M-BD 540W solar panel. Specs: 20.94% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/resun-solar-rs8i-540m-bd" updated: 2026-09-11 --- # Resun Solar RS8I-540M-BD Middle of its segment, weak in heat 8,019 panels in the 440-640 W band, all technologies ## Identity - **Manufacturer:** Resun Solar - **Model:** RS8I-540M-BD - **Series:** RS8I-540-545M-BD - **Rated power:** 540 W - **Cell technology:** Monocrystalline - **Bifacial:** yes ## How it compares Compared against 440-640 W band, all technologies (8019 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 540 W | 535 W | Typical | | | Module efficiency | 20.94% | 22.27% | Weak - bottom 17% | 9,991 | | Power density | 209.4 | 222.6 | Weak - bottom 17% | 9,958 | | Temperature coefficient | -0.390 | -0.300 | Weak - bottom 1% | 13,579 | | Weight (kg) | 29.0 kg | 27.5 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.94% | 22.27% | Weak - bottom 17% | 9,991 | | Power density | 209.4 | 222.6 | Weak - bottom 17% | 9,958 | | Temperature coefficient | -0.390 | -0.300 | Weak - bottom 1% | 13,579 | | Weight per kWp | 53.7 | 52.7 | Typical | 7,707 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **-0.390 %/°C temperature coefficient** - Bottom 1% of the 440-640 W band, against a median of -0.300. Ranked 13,579th in the whole database. - **20.94% module efficiency** - Bottom 17% of the 440-640 W band, against a median of 22.27%. - **209.4 watts per square metre** - Bottom 17% of the 440-640 W band, against a median of 222.6. - **Best for:** Commercial and utility-scale. - **Not ideal for:** Hot climates, tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 540 W - **Efficiency:** 20.94 % - **Voltage at Pmax (Vmp):** 41.64 V - **Current at Pmax (Imp):** 12.97 A - **Open-circuit voltage (Voc):** 49.60 V - **Short-circuit current (Isc):** 13.86 A - **Max system voltage:** 1500 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:** Monocrystalline - **Cell count:** 144 - **Bifacial:** yes ### Physical - **Length:** 2274 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 29.0 kg - **Area:** 2.58 m2 - **Power density:** 209.4 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Annual degradation:** 0.50 % - **Output after 30 years:** 456 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 9991 of 14005 | | Power density | 9958 of 14005 | | Temperature coefficient | 13579 of 14005 | | Weight | 7707 of 14005 | | Warranty | 21 of 14005 | ## About this series The RS8I-540-545M-BD series consists of bifacial monocrystalline modules built on large 182mm cells, engineered for grid-connected installations that need to extract maximum output from every square meter of array space. With a 144-cell layout featuring 9, 10, or 11 busbars, the panel captures irradiance on both its front and rear sides, meaningfully boosting energy yield without increasing the mounting footprint. The manufacturer applies an **anti-reflective, hydrophobic coating** that reduces dust buildup and improves light absorption, giving the module **strong performance in low-light conditions** - mornings, evenings, and overcast days. Built with 3.2mm tempered glass and a robust frame, the module has been tested for **resistance to harsh environmental conditions**, including heavy wind and snow loads, making it a solid choice for installations along coastlines, in deserts, and near bodies of water. The series ships with a guaranteed **positive power output tolerance** of 0 to +5W, removing the risk of underperforming units, and backed by a **30-year linear power warranty** with low annual degradation, it represents a dependable investment for both rooftop systems and ground-mounted solar farms. ## Notable figures - Module efficiency of 20.9% is 0.9pp below average for \*\*database\*\* panels (median: 21.8%) - 209.4 W/m² power density is 8.7 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 - At 29.0 kg, this panel is 2.5 kg heavier than the \*\*database\*\* median (26.5 kg) - more demanding for installation crews - Ranked #9991 out of 14005 panels for efficiency in the database ## Questions ### Is the Resun Solar RS8I-540-545M-BD series still available for purchase? No, the RS8I-540-545M-BD series has been discontinued from Resun Solar's current production lineup. Modules may still be available from distributors while stock lasts, as the manufacturer has replaced it with newer designs. Buyers should confirm current stock availability and production date with the seller before purchasing, since remaining inventory is limited. ### How much extra energy does the bifacial design of the RS8I-540-545M-BD actually generate? By capturing sunlight on both the front and rear sides, bifacial modules in the RS8I-540-545M-BD series can produce additional energy yield depending on ground surface, mounting height, and albedo of the surroundings - reflective surfaces like white gravel or light-colored roofing increase this effect. The greatest gains occur in ground-mounted installations elevated above the ground with reflective terrain below. ### What warranty comes with the RS8I-540-545M-BD panels and what does it cover? The manufacturer provides a 12-year product warranty along with a 30-year linear power warranty featuring low annual degradation. This means the module retains a high percentage of its nominal power even after three decades of operation, making it a financially safe investment for both rooftop and ground-mount solar farm installations. ### Are RS8I-540-545M-BD panels suitable for harsh weather conditions, such as coastal installations? Yes, the module's tempered 3.2mm glass and robust frame have been tested for resistance to heavy wind and snow loads. The panel performs well in coastal, desert, and near-water installations, where it also benefits from additional reflected light thanks to its bifacial technology. ### What's the difference between the 540W and 545W variants in this series, and what should buyers watch for? The RS8I-540-545M-BD series offers several power output variants ranging from 540 to 545 Wp, with 545 Wp being the maximum available. These differences result from post-production cell sorting (binning). Thanks to a guaranteed positive power tolerance of 0 to +5W, buyers can be confident the actual module output will never fall below the rated nameplate value. ### Do RS8I-540-545M-BD panels perform well in low-light conditions, such as mornings or overcast days? Yes, the applied anti-reflective and hydrophobic coating reduces dirt buildup and improves light absorption, allowing the module to maintain high efficiency even at low sun angles or under cloudy skies. This is a significant advantage in regions with variable weather, where consistent energy yield throughout the day matters most. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/RS8I540-545BD-cbc64a8c0bc2.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, lighter, +4.1 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Cooler, lighter, +3.9 pp | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, lighter, +3.9 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, lighter, +3.8 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | Cooler, lighter, +3.7 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | Cooler, lighter, +3.6 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | Cooler, lighter, +3.6 pp | | [Resun Solar RS8I-M HC-535](https://comparepv.com/panel/resun-solar-rs8i-m-hc-535) | 535 W | Cooler, -0.2 pp | | [Resun Solar RS8I-M HC-540](https://comparepv.com/panel/resun-solar-rs8i-m-hc-540) | 540 W | Cooler | | [Resun Solar RS8I-545M-BD](https://comparepv.com/panel/resun-solar-rs8i-545m-bd) | 545 W | Very close match | | [Resun Solar RS8I-M HC-545](https://comparepv.com/panel/resun-solar-rs8i-m-hc-545) | 545 W | Cooler | | [Resun Solar RS8I-M FULL BLACK 550W](https://comparepv.com/panel/resun-solar-rs8i-m-full-black-550w) | 550 W | +10 W, +0.3 pp | | [Resun Solar RS8I-M HC-555](https://comparepv.com/panel/resun-solar-rs8i-m-hc-555) | 555 W | +15 W, cooler, +0.5 pp | | [Resun Solar RS8I-555M-F30](https://comparepv.com/panel/resun-solar-rs8i-555m-f30) | 555 W | +15 W, lighter, +0.6 pp | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +110 W, cooler, +4.3 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +105 W, cooler, +4.1 pp | --- Source: https://comparepv.com/panel/resun-solar-rs8i-540m-bd Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.