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Resun Solar Brand review

RS8I-M-BD TOPCON

630 Wp TOPCon
ComparePV verdict

Light for its output, no clear weak spot

Rank 1,586 of 14,005
Compare panels Datasheet PDF
Power (Wp)
630
Typical for its class
Efficiency (%)
23.32
Strong · top 15%
Density (Wp/m²)
233.2
Strong · top 16%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
29.1
Strong · 3.6 kg below median
Warranty (yrs)
30
Typical · median 30 yrs

The RS8I-M-BD TOPCon series consists of solar modules built on monocrystalline half-cut TOPCon cells, featuring multi-busbar SMBB technology that reduces internal power loss and boosts conversion efficiency. Splitting the cells in half significantly lowers the risk of hot-spot effects caused by partial shading, making the series a solid choice both for rooftops with uneven sun exposure and for utility-scale installations. The modules stand out for their high resistance to PID degradation, keeping energy yield stable throughout the system's lifetime and helping to keep LCOE low. Tempered glass with enhanced light transmittance ensures strong performance even in low-light conditions, such as early morning or overcast days. The mechanical design is built for extreme weather - the series offers high mechanical strength against wind and snow loads and is certified for resistance to salt mist and ammonia, which matters for coastal and agricultural installations. The manufacturer guarantees low annual power degradation of just 0.5% over 30 years, backed by a 15-year product warranty and a 30-year linear power warranty, making the RS8I-M-BD TOPCon a reliable long-term investment for installers and asset owners seeking predictable returns.

Ranking

1,086 panels in the segment TOPCon 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.32% 22.80% Strong · top 15% 973
Power density 233.2 227.7 Strong · top 16% 1,003
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 46.2 53.1 Strong · top 8% 1,066
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

3 positive · 0 caution
Best for

Commercial and utility-scale.

Strengths
46.2 kg per kWp

Top 8% of the TOPCon 600-650 W segment, against a median of 53.1. Ranked 1,066th in the whole database.

23.32% module efficiency

Top 15% of the TOPCon 600-650 W segment, against a median of 22.80%.

233.2 watts per square metre

Top 16% of the TOPCon 600-650 W segment, against a median of 227.7.

Notes from the database
  • 23.3% module efficiency - 0.5pp better than the TOPCon 600-650W median of 22.8%
  • 233.2 W/m² power density - 5.5 W/m² more than TOPCon 600-650W median (227.7 W/m²), more power per roof area
  • At -0.29%/°C, hot weather performance is typical for TOPCon 600-650W panels
  • At 29.1 kg, this panel is 3.6 kg lighter than TOPCon 600-650W median (32.7 kg) - easier handling during installation
  • In the top 7% for efficiency among all TOPCon panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 630 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.32 % Strong Segment median 22.80%
Vmpp · Impp 41.56 V · 15.16 A Operating point at max power
Voc · Isc 49.50 V · 16.03 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2382×1134×30 mm · 2.70 m² of roof
Weight 29.1 kg Strong Strong · 3.6 kg below median
Cells 132 · TOPCon Monocrystalline
Coefficient Pmax -0.290 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.250 · 0.040 %/°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 630 Wp appear here. The rest cover the whole series.

0.5% Annual Degradation over 30 years 0.5% Annual Degradation over 30 years 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
-

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

Heat losses
-0.290 %/°C against a segment median of -0.290
-

Alternatives

All Resun Solar panels
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Resun Solar RS8I-M-BD TOPCON 630 W 23.32% -0.290 29.1 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +1.9 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +50 W, cooler, +1.9 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +45 W, cooler, +1.7 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +1.7 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg +40 W, cooler, +1.5 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg +40 W, cooler, +1.5 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg Cooler, lighter, +1.5 pp
RS8H-M-BD-595W 595 W 22.03% -0.290 29.1 kg -35 W, -1.3 pp
RS8H-M-BD-600W 600 W 22.21% -0.290 29.1 kg -30 W, -1.1 pp
RS8H-M-BD-605W 605 W 22.40% -0.290 29.1 kg -25 W, -0.9 pp
RS8H-M-BD-610W 610 W 22.58% -0.290 29.1 kg -20 W, -0.7 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +70 W, heavier, +1.7 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +65 W, heavier, +1.6 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg +40 W, heavier, +1.5 pp

Found 1119 panels of the same or similar size to this one, within ±10 mm. See them here Found 1125 panels of the same or similar size to this one, within ±25 mm. See them here Found 1236 panels of the same or similar size to this one, within ±50 mm. See them here Found 1917 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What is the maximum power output of the RS8I-M-BD TOPCon module and who is it suited for?
Modules in the RS8I-M-BD TOPCon series reach up to 630 Wp. This high per-panel output reduces the number of modules needed to reach a given system capacity, making the series well suited for large-scale solar farms as well as industrial and agricultural rooftops where maximizing available surface area is a priority.
How does the TOPCon technology in the RS8I-M-BD differ from standard PERC panels?
TOPCon is a newer cell technology that uses an additional passivation layer to reduce carrier recombination, resulting in higher conversion efficiency than conventional PERC cells. Combined with half-cut cell design and multi-busbar SMBB technology, the module produces more energy from the same surface area and handles partial shading better.
What warranty comes with RS8I-M-BD TOPCon panels and what does it cover?
Resun Solar provides a 15-year product warranty and a 30-year linear power warranty. This means protection against material and workmanship defects for 15 years, while power output degradation is guaranteed to stay within the declared curve for 30 years, supporting predictable long-term returns on investment.
Are RS8I-M-BD TOPCon panels suitable for coastal or agricultural installations?
Yes, the series is certified resistant to salt mist and ammonia corrosion, making it well suited for coastal installations where panels are exposed to salty air, as well as for agricultural sites where elevated ammonia levels from livestock farming can be present in the air.
What is the annual power degradation rate of RS8I-M-BD TOPCon modules?
The manufacturer declares a very low annual power degradation rate of around 0.5% over a 30-year span. This means the panel should retain a significant share of its original output after three decades of operation, which matters when estimating long-term energy yield and system profitability.
Do RS8I-M-BD TOPCon modules perform well in low-light conditions, such as early morning?
Yes, the tempered glass with enhanced light transmittance improves solar radiation absorption even at low sun angles or under cloud cover. As a result, the panels generate energy more efficiently in early morning, late afternoon, and overcast conditions compared to standard modules without this feature.
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