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Resun Solar Brand review

RS8I615M TOPCON

615 Wp TOPCon
ComparePV verdict

Light for its output, no clear weak spot

Rank 2,284 of 14,005
Compare panels Datasheet PDF
Power (Wp)
615
Typical for its class
Efficiency (%)
22.77
Typical · median 22.80%
Density (Wp/m²)
227.7
Typical · median 227.7
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 Resun Solar RS8I-M TOPCon series is built for installations where every square meter of roof or ground space counts. The panel is based on N-type TOPCon cells in a half-cut configuration, which reduces power losses from partial shading and delivers better performance stability at high temperatures compared to conventional PERC modules. The applied multi-busbar technology improves current collection across the cell surface and strengthens interconnection reliability, meaningfully lowering the risk of microcracks and long-term degradation. The RS8I-M series is well suited both for residential rooftop installations and smaller commercial projects, where high productivity is expected despite limited mounting area. Thanks to its low temperature coefficient, the panels maintain output even on hot days, translating into higher real-world energy yield compared to older technologies. The manufacturer backs build quality with a long-term product and power warranty, along with certifications confirming compliance with international safety and performance standards, including verified resistance to PID degradation. This is a solid choice for investors seeking proven TOPCon technology at a reasonable price-to-performance ratio.

Ranking

1,086 panels in the segment TOPCon 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 22.77% 22.80% Typical 3,073
Power density 227.7 227.7 Typical 3,077
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 47.3 53.1 Strong · top 13% 1,636
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

1 positive · 0 caution
Best for

Commercial, utility-scale, shaded-installations and hot-climate.

Strengths
47.3 kg per kWp

Top 13% of the TOPCon 600-650 W segment, against a median of 53.1.

Notes from the database
  • Efficiency of 22.8% matches the TOPCon 600-650W median
  • Power density of 227.7 W/m² matches the TOPCon 600-650W median
  • Temperature coefficient of -0.29%/°C matches the TOPCon 600-650W median
  • At 29.1 kg, this panel is 3.6 kg lighter than TOPCon 600-650W median (32.7 kg) - easier handling during installation
  • Ranked #3073 out of 14005 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 615 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.77 % Typical Segment median 22.80%
Vmpp · Impp 40.98 V · 15.01 A Operating point at max power
Voc · Isc 48.90 V · 15.88 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2382×1134×35 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 615 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 RS8I615M TOPCON 615 W 22.77% -0.290 29.1 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg +35 W, cooler, +2.4 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg +30 W, cooler, +2.2 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg +25 W, cooler, +2.0 pp
LR8-66HVD-665M 665 W 24.62% -0.260 33.5 kg +50 W, heavier, +1.9 pp
JKM650-670N-66QL6-BDV (665W class) 665 W 24.62% -0.260 32.5 kg +50 W, heavier, +1.9 pp
HY665-B144DSS 665 W 24.62% -0.260 27.6 kg +50 W, cooler, +1.9 pp
SPDG665-BC132R12 665 W 24.62% -0.260 33.5 kg +50 W, heavier, +1.9 pp
RS8H-M-BD-595W 595 W 22.03% -0.290 29.1 kg -20 W, -0.7 pp
RS8H-M-BD-600W 600 W 22.21% -0.290 29.1 kg -15 W, -0.6 pp
RS8H-M-BD-605W 605 W 22.40% -0.290 29.1 kg -10 W, -0.4 pp
RS8H-M-BD-610W 610 W 22.58% -0.290 29.1 kg Very close match
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +65 W, cooler, +2.4 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +60 W, cooler, +2.2 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +85 W, heavier, +2.2 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +80 W, heavier, +2.1 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg +55 W, cooler, +2.0 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 Resun Solar RS8I-M TOPCon panel?
Modules from the RS8I-M TOPCon series reach a maximum power output of up to 630 Wp. This is achieved through N-type TOPCon half-cut cells combined with multi-busbar technology, which increase the active surface area and current collection efficiency. This means a higher energy yield per roof area compared to classic PERC panels of similar dimensions.
Are RS8I-M TOPCon panels bifacial?
No, the RS8I-M TOPCon series consists of mono-facial modules optimized for standard rooftop and ground-mounted installations without relying on reflected light from the ground. If additional energy gain from the rear side is a priority, the manufacturer's bifacial lineup should be considered instead, but for typical residential installations a mono-facial panel is more than sufficient.
What warranty comes with the Resun Solar RS8I-M TOPCon series?
The manufacturer provides a 15-year product warranty and a 30-year linear power output warranty. This means that over three decades of operation, the panel maintains a guaranteed percentage of its original power, while manufacturing or material defects are covered during the first 15 years. This is a standard benchmark for modern TOPCon-based modules.
How does TOPCon technology in the RS8I-M differ from classic PERC panels?
The N-type TOPCon cells used in the RS8I-M have lower recombination losses and better surface passivation than P-type PERC cells, resulting in higher efficiency and slower power degradation over time. TOPCon also handles high operating temperatures better, so during hot weather on a heated roof, the panel loses less power than a comparable PERC module.
Do RS8I-M TOPCon panels perform well on hot days?
Yes, thanks to the low temperature coefficient of TOPCon cells, RS8I-M modules lose less power as operating temperature rises compared to older PERC technology. In practice this means a higher real-world energy yield in summer, when rooftop panels can heat up to 60-70 degrees Celsius, making this an important advantage in warmer climates.
Is RS8I-M TOPCon a good choice for a small rooftop installation?
Yes, the high power output per single module (up to 630 Wp) makes the RS8I-M series particularly suitable for limited roof space where maximizing total system power matters. Fewer panels are needed to reach the target capacity, which also means faster installation and fewer mounting points on the roof structure.
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