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Resun Solar Brand review

RS8I-M TOPCON-425

425 Wp TOPCon
ComparePV verdict

Middle of its segment, modest efficiency

Rank 10,290 of 14,005
Compare panels Datasheet PDF
Power (Wp)
425
Typical for its class
Efficiency (%)
21.27
Weak · bottom 10%
Density (Wp/m²)
212.7
Weak · bottom 13%
Temp (%/°C)
-0.300
Typical · median -0.290
Weight (kg)
22.3
Typical · median 22.0 kg
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

1,218 panels in the segment TOPCon 400-450 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.27% 22.00% Weak · bottom 10% 8,849
Power density 212.7 220.2 Weak · bottom 13% 8,733
Temperature coefficient -0.300 -0.290 Typical 6,093
Weight per kWp 52.5 51.4 Typical 6,006
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 · 2 caution
Best for

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

Not ideal for

Tight roof space and roofs where every square metre has to count.

Watch-outs
21.27% module efficiency

Bottom 10% of the TOPCon 400-450 W segment, against a median of 22.00%.

212.7 watts per square metre

Bottom 13% of the TOPCon 400-450 W segment, against a median of 220.2.

Notes from the database
  • At 21.3% efficiency, this panel is 0.7pp below the TOPCon 400-450W median of 22.0%
  • 212.7 W/m² power density is 7.5 W/m² below TOPCon 400-450W median (220.2 W/m²) - requires larger installation area
  • At -0.30%/°C, hot weather performance is typical for TOPCon 400-450W panels
  • In the top 63% for efficiency among all TOPCon panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 425 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.27 % Weak Segment median 22.00%
Vmpp · Impp 43.11 V · 9.86 A Operating point at max power
Voc · Isc 51.20 V · 10.55 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1762×1134×35 mm · 2.00 m² of roof
Weight 22.3 kg Typical Typical · median 22.0 kg
Cells 144 · TOPCon Monocrystalline
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 425 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
-0.300 %/°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 TOPCON-425 425 W 21.27% -0.300 22.3 kg You are here
SPR-MAX7-475 475 W 24.00% -0.270 21.1 kg +50 W, +2.7 pp, +10 yr warranty
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg +40 W, lighter, +2.5 pp
JAT54S40-475/LR 475 W 23.80% -0.260 19.3 kg +50 W, cooler, +2.5 pp
TWMNH-48HW475 475 W 23.80% -0.280 23.7 kg +50 W, cooler, +2.5 pp
CHSM48RN(DG)/F-BH-475 475 W 23.80% -0.290 24.5 kg +50 W, heavier, +2.5 pp
AIKO-A475-MCE54Mw 475 W 23.80% -0.260 21.0 kg +50 W, cooler, +2.5 pp
AIKO-A475-MAH54Mw 475 W 23.80% -0.260 21.5 kg +50 W, cooler, +2.5 pp
RS8I-M TOPCON-430 430 W 21.52% -0.300 22.3 kg +0.2 pp
RS8I-M TOPCON-435 435 W 21.77% -0.300 22.3 kg +10 W, +0.5 pp
RS8I-M TOPCON-440 440 W 22.02% -0.300 22.3 kg +15 W, +0.8 pp
RS8I-M TOPCON-445 445 W 22.27% -0.300 22.3 kg +20 W, +1.0 pp
RS8I-M TOPCON-450 450 W 22.52% -0.300 22.3 kg +25 W, +1.2 pp
RS8I-M TOPCON-455 455 W 22.77% -0.300 22.3 kg +30 W, +1.5 pp
RS8I-M TOPCON-460 460 W 23.02% -0.300 22.3 kg +35 W, +1.8 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +85 W, cooler, +3.7 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +70 W, cooler, +3.5 pp

Found 1395 panels of the same or similar size to this one, within ±10 mm. See them here Found 1425 panels of the same or similar size to this one, within ±25 mm. See them here Found 3614 panels of the same or similar size to this one, within ±50 mm. See them here Found 3962 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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