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Resun Solar Brand review

RS8I-540M-BD

540 Wp Monocrystalline Bifacial
ComparePV verdict

Middle of its segment, weak in heat

Rank 7,743 of 14,005
Compare panels Datasheet PDF
Power (Wp)
540
Typical for its class
Efficiency (%)
20.94
Weak · bottom 17%
Density (Wp/m²)
209.4
Weak · bottom 17%
Temp (%/°C)
-0.390
Weak · bottom 1%
Weight (kg)
29.0
Typical · median 27.5 kg
Warranty (yrs)
30
Typical · median 30 yrs

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.

Ranking

8,019 panels in the 440-640 W band, all technologies
Metric This panel Median Position in segment Overall 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
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 3 caution
Best for

Commercial and utility-scale.

Not ideal for

Hot climates, tight roof space and roofs where every square metre has to count.

Watch-outs
-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.

Notes from the database
  • 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

Specifications

Open datasheet PDF
Nominal power (Pmax) 540 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 20.94 % Weak Segment median 22.27%
Vmpp · Impp 41.64 V · 12.97 A Operating point at max power
Voc · Isc 49.60 V · 13.86 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2274×1134×35 mm · 2.58 m² of roof
Weight 29.0 kg Typical Typical · median 27.5 kg
Cells 144 Monocrystalline
Coefficient Pmax -0.390 %/°C Weak bottom 1% 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 Typical median 30 yrs · median 30 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 -0.300
-

Alternatives

All Resun Solar panels
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Resun Solar RS8I-540M-BD 540 W 20.94% -0.390 29.0 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg Cooler, lighter, +4.1 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg Cooler, lighter, +3.9 pp
LR7-60HVH-560M 560 W 24.80% -0.260 25.0 kg Cooler, lighter, +3.9 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg Cooler, lighter, +3.8 pp
LR7-60HVH-555M 555 W 24.60% -0.260 25.0 kg Cooler, lighter, +3.7 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg Cooler, lighter, +3.6 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg Cooler, lighter, +3.6 pp
RS8I-M HC-535 535 W 20.70% -0.340 28.6 kg Cooler, -0.2 pp
RS8I-M HC-540 540 W 20.89% -0.340 28.6 kg Cooler
RS8I-545M-BD 545 W 21.13% -0.390 29.0 kg Very close match
RS8I-M HC-545 545 W 21.09% -0.340 28.6 kg Cooler
RS8I-M FULL BLACK 550W 550 W 21.28% -0.390 28.6 kg +10 W, +0.3 pp
RS8I-M HC-555 555 W 21.47% -0.340 28.6 kg +15 W, cooler, +0.5 pp
RS8I-555M-F30 555 W 21.50% -0.390 27.2 kg +15 W, lighter, +0.6 pp
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg +110 W, cooler, +4.3 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg +105 W, cooler, +4.1 pp

Found 2337 panels of the same or similar size to this one, within ±10 mm. See them here Found 2368 panels of the same or similar size to this one, within ±25 mm. See them here Found 2382 panels of the same or similar size to this one, within ±50 mm. See them here Found 2540 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
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.
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