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Resun Solar RS8I-M-DG-555
Resun Solar Brand review

RS8I-M-DG-555

555 Wp TOPCon Bifacial 1000%
ComparePV verdict

Middle of its segment, modest efficiency

Rank 5,902 of 14,005
Compare panels Datasheet PDF
Power (Wp)
555
Weak · bottom 5%
Efficiency (%)
21.48
Weak · bottom 6%
Density (Wp/m²)
214.8
Weak · bottom 6%
Temp (%/°C)
-0.300
Typical · median -0.290
Weight (kg)
31.5
Weak · bottom 12%
Warranty (yrs)
30
Typical · median 30 yrs

The Resun Solar RS8I-M-DG series are double-glass (glass-glass) modules designed for stable operation over many years in rooftop and larger farm installations. The use of N-type cells in TOPCon technology helps to minimize losses and maintain higher efficiency even in more demanding operating conditions. This is a solution for investors who want to maximize space utilization - thanks to bifacial design, the module can also generate energy from reflected light from the ground, which translates into higher yields in areas where albedo and proper mounting are critical.

The RS8I-M-DG stands out due to its half-cut technology, which improves resistance to shading and reduces the risk of local overheating, thereby increasing the predictability of daily production. The series is suitable for installation companies looking for modules for commercial projects, carport installations, and ground-mounted systems, where the combination of bifacial operation with a robust, double-glass construction and a long-term focus on durability gives it an advantage over the competition.

Ranking

1,018 panels in the segment TOPCon 550-600 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.48% 22.44% Weak · bottom 6% 8,152
Power density 214.8 224.4 Weak · bottom 6% 8,148
Temperature coefficient -0.300 -0.290 Typical 6,093
Weight per kWp 56.8 53.8 Weak · bottom 12% 10,838
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, utility-scale and shaded-installations.

Not ideal for

Tight roof space, roofs where every square metre has to count and weight-limited structures.

Watch-outs
21.48% module efficiency

Bottom 6% of the TOPCon 550-600 W segment, against a median of 22.44%. Ranked 8,152nd in the whole database.

214.8 watts per square metre

Bottom 6% of the TOPCon 550-600 W segment, against a median of 224.4. Ranked 8,148th in the whole database.

56.8 kg per kWp

Bottom 12% of the TOPCon 550-600 W segment, against a median of 53.8.

Notes from the database
  • Efficiency of 21.5% is 1.0pp below the TOPCon 550-600W median (22.4%)
  • At 214.8 W/m², this panel generates 9.7 W/m² less per unit area than TOPCon 550-600W median (224.4 W/m²)
  • Temperature coefficient of -0.30%/°C matches the TOPCon 550-600W median
  • #8152 for efficiency, #6093 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 555 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.48 % Weak Segment median 22.44%
Vmpp · Impp 42.34 V · 13.11 A Operating point at max power
Voc · Isc 50.90 V · 13.92 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2279×1134×30 mm · 2.58 m² of roof
Weight 31.5 kg Weak Weak · bottom 12%
Cells 144 · TOPCon Monocrystalline
Bifaciality 1000 % Rear output as a share of front
Coefficient Pmax -0.300 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.250 · 0.045 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 15 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
Degradation 0.50 % Per year after the first

Datasheet charts

Open datasheet PDF

Measured curves published by Resun Solar in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 555 Wp appear here. The rest cover the whole series.

0.5% Annual Degradation Over 30 Years (Linear Performance Warranty) 0.5% Annual Degradation Over 30 Years (Linear Performance Warranty) Whole series I-V Curves of PV Module I-V Curves of PV Module Whole series P-V Curves of PV Module P-V Curves of PV Module Whole series

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
-
With bifacial gain
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.300 %/°C against a segment median of -0.290
-
Bifacial gain
Rear gain over light concrete: -
-

Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.

Alternatives

All Resun Solar panels
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Resun Solar RS8I-M-DG-555 555 W 21.48% -0.300 31.5 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg Cooler, lighter, +3.5 pp
LR7-60HVH-560M 560 W 24.80% -0.260 25.0 kg Cooler, lighter, +3.3 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg Cooler, lighter, +3.2 pp
LR7-60HVH-555M 555 W 24.60% -0.260 25.0 kg Cooler, lighter, +3.1 pp
LR7-60HVHL-550M 550 W 24.40% -0.260 16.3 kg Cooler, 15 kg lighter, +2.9 pp
JAT60S40-540/LR 540 W 24.40% -0.260 23.5 kg Cooler, lighter, +2.9 pp
RS8I-M HC-535 535 W 20.70% -0.340 28.6 kg Hotter, lighter, -0.8 pp
RS8I-540M-BD 540 W 20.94% -0.390 29.0 kg Hotter, lighter, -0.5 pp
RS8I-M HC-540 540 W 20.89% -0.340 28.6 kg Hotter, lighter, -0.6 pp
RS8I-545M-BD 545 W 21.13% -0.390 29.0 kg Hotter, lighter, -0.4 pp
RS8I-M HC-545 545 W 21.09% -0.340 28.6 kg Hotter, lighter, -0.4 pp
RS8I-M FULL BLACK 550W 550 W 21.28% -0.390 28.6 kg Hotter, lighter
RS8I-555M-F30 555 W 21.50% -0.390 27.2 kg Hotter, lighter
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg +95 W, lighter, +3.7 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg +90 W, lighter, +3.5 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg +85 W, lighter, +3.3 pp

Found 2326 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 2542 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranty does Resun Solar offer on the RS8I-M-DG series?
Resun Solar provides a 15-year product warranty on RS8I-M-DG modules, covering manufacturing defects and material failures. In addition, the manufacturer offers a 30-year linear power warranty, guaranteeing at least 85% of rated output after that period. This extended warranty reflects the durability of the double-glass (glass-glass) construction and the inherently lower annual degradation rate of N-type TOPCon cells compared to older PERC technology.
Are the RS8I-M-DG modules suitable for carports or ground-mounted systems?
Yes, the RS8I-M-DG series is an excellent fit for carports and ground-mounted solar farms. The bifacial design captures reflected light from the ground surface, while the glass-glass encapsulation delivers superior moisture resistance and mechanical load tolerance compared to standard backsheet modules. With up to 590 Wp per module, fewer units are needed to reach the target system capacity, reducing BoS costs.
How does the TOPCon technology in the RS8I-M-DG differ from conventional PERC cells?
TOPCon (Tunnel Oxide Passivated Contact) cells are built on an N-type silicon substrate with an additional passivation layer that minimizes carrier recombination. This translates to higher module efficiency — up to 22.84% for the RS8I-M-DG — and a lower temperature coefficient of -0.32%/°C, meaning smaller output losses on hot summer days compared to standard PERC modules. N-type TOPCon also shows better resistance to LID and PID degradation.
What is the energy gain from the bifacial design of the RS8I-M-DG, and what affects it most?
The bifacial RS8I-M-DG modules harvest albedo light reflected from the ground through their active rear surface. The actual energy gain depends on ground reflectivity: white gravel or snow can add 10–20% extra yield, while green grass typically contributes 5–10%. The bifacial gain is maximized in ground-mounted or carport installations where sufficient clearance exists between the modules and the surface, allowing reflected light to reach the rear side.
How much does an RS8I-M-DG panel weigh, and can a standard roof structure support it?
The RS8I-M-DG weighs approximately 28 kg, which is 5–7 kg more than a comparable single-glass module of similar wattage — a direct result of its glass-glass construction. Before installing on a roof, a structural assessment is recommended, especially for older buildings. Modern residential roof trusses are generally built with adequate load margins, but each installation should be reviewed individually with a certified installer.
How does half-cut cell technology in the RS8I-M-DG help under partial shading conditions?
The RS8I-M-DG uses 144 half-cut cells, meaning each cell has a smaller active area and carries lower operating current. When a shadow falls on part of the module — from a chimney, antenna, or nearby obstruction — it affects only a portion of the cell strings, so the unshaded section continues generating power. Half-cut cells also reduce resistive losses and lower the risk of hot-spot formation, which extends the overall service life of the module.
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