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Resun Solar Brand review

RS8V420M-FB

420 Wp TOPCon
ComparePV verdict

Middle of its segment, weak in heat

Rank 10,194 of 14,005
Compare panels Datasheet PDF
Power (Wp)
420
Weak · bottom 16%
Efficiency (%)
21.51
Weak · bottom 20%
Density (Wp/m²)
215.1
Weak · bottom 19%
Temp (%/°C)
-0.350
Weak · bottom 3%
Weight (kg)
21.5
Typical · median 22.0 kg
Warranty (yrs)
30
Typical · median 30 yrs

The RS8V-M-FB series consists of Full Black photovoltaic modules designed for installations where both energy performance and visual appeal matter. The panels use monocrystalline TOPCon cells with multi-busbar and half-cell technology, which reduces internal power losses within the module and increases resistance to microcracks and busbar damage. The half-cell design further minimizes the risk of hot-spot effects caused by partial shading, allowing the module to maintain stable performance even in more demanding mounting conditions, such as roofs with nearby chimneys or antennas. The all-black styling makes the series particularly popular for residential installations, where roof appearance carries aesthetic weight. The manufacturer provides high PID resistance, translating into lower power degradation over time and a reduced LCOE for the energy the installation produces. Tempered glass with enhanced light transmittance improves energy yield under low-light conditions, and the module is certified for resistance to high wind and snow loads as well as salt mist and ammonia exposure. It's a solid choice for installers and investors seeking an aesthetic, reliable premium panel for residential and commercial applications.

Ranking

1,218 panels in the segment TOPCon 400-450 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.51% 22.00% Weak · bottom 20% 7,894
Power density 215.1 220.2 Weak · bottom 19% 7,882
Temperature coefficient -0.350 -0.290 Weak · bottom 3% 10,419
Weight per kWp 51.2 51.4 Typical 4,567
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

Residential, commercial and shaded-installations.

Not ideal for

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

Watch-outs
-0.350 %/°C temperature coefficient

Bottom 3% of the TOPCon 400-450 W segment, against a median of -0.290. Ranked 10,419th in the whole database.

215.1 watts per square metre

Bottom 19% of the TOPCon 400-450 W segment, against a median of 220.2.

21.51% module efficiency

Bottom 20% of the TOPCon 400-450 W segment, against a median of 22.00%.

Notes from the database
  • Efficiency of 21.5% matches the TOPCon 400-450W median
  • At 215.1 W/m², this panel generates 5.1 W/m² less per unit area than TOPCon 400-450W median (220.2 W/m²)
  • -0.35%/°C temperature coefficient - 0.06pp worse than TOPCon 400-450W median (-0.29%/°C), expect higher hot weather losses
  • #7894 for efficiency, #10419 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 420 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.51 % Weak Segment median 22.00%
Vmpp · Impp 31.78 V · 13.22 A Operating point at max power
Voc · Isc 37.58 V · 14.11 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1722×1134×30 mm · 1.95 m² of roof
Weight 21.5 kg Typical Typical · median 22.0 kg
Cells 108 · TOPCon Monocrystalline
Coefficient Pmax -0.350 %/°C Weak bottom 3% of its segment
Coefficient Voc · Isc -0.320 · 0.050 %/°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

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
-0.350 %/°C against a segment median of -0.290
-

Alternatives

All Resun Solar panels
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Resun Solar RS8V420M-FB 420 W 21.51% -0.350 21.5 kg You are here
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg +45 W, cooler, +2.3 pp
LX-465M/182R-96+ GG 465 W 23.80% -0.260 23.5 kg +45 W, cooler, +2.3 pp
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg Cooler, +2.2 pp, +10 yr warranty
AIKO-A470-MAH54Mb 470 W 23.60% -0.260 21.5 kg +50 W, cooler, +2.1 pp
AIKO-A460-MAH54Mb 460 W 23.60% -0.290 20.5 kg +40 W, cooler, +2.1 pp
HSM-BD54-LA470 470 W 23.60% -0.260 21.5 kg +50 W, cooler, +2.1 pp
RS8V-M-400 400 W 20.48% -0.350 22.0 kg -20 W, -1.0 pp
RS8V-M-405 405 W 20.74% -0.350 22.0 kg -15 W, -0.8 pp
RS8V-M-410W 410 W 21.00% -0.350 22.0 kg -10 W, -0.5 pp
RS8V-M-415W 415 W 21.25% -0.350 22.0 kg -0.3 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +90 W, cooler, +3.5 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +75 W, cooler, +3.3 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +85 W, cooler, +3.2 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +70 W, cooler, +3.0 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg +80 W, cooler, +3.0 pp
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg +80 W, cooler, +3.0 pp

Found 1783 panels of the same or similar size to this one, within ±10 mm. See them here Found 1914 panels of the same or similar size to this one, within ±25 mm. See them here Found 3392 panels of the same or similar size to this one, within ±50 mm. See them here Found 3970 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranty does the Resun Solar RS8V-M-FB series come with?
The manufacturer provides a 15-year product warranty and a 30-year power output warranty. This means the module maintains a guaranteed level of energy production for three decades, while manufacturing or material defects during the first 15 years are covered by direct manufacturer support. This is a standard offering for premium TOPCon panels.
How does TOPCon cell technology in the RS8V-M-FB differ from standard PERC cells?
TOPCon cells used in the RS8V-M-FB feature an additional passivation layer that reduces electron recombination and increases conversion efficiency compared to older PERC cells. In practice, this results in higher power output from the same module area, better performance at high temperatures, and slower power degradation over the years of operation.
Are RS8V-M-FB panels suitable for a residential roof in terms of appearance?
Yes, the Full Black series was specifically designed with residential roof aesthetics in mind. The black frame, black backsheet, and black busbars help the panel blend into the roof surface, making it a popular choice for homeowners who care about the visual appearance of their installation, for example on visible sloped residential roofs.
Does the half-cell design in the RS8V-M-FB protect against hot-spot effects caused by shading from a chimney or antenna?
Yes, splitting cells into half-cut units with multi-busbar technology reduces power losses and the risk of localized overheating when part of the module is shaded, for instance by a chimney or antenna. As a result, the panel maintains more stable performance than modules with full-size cells under similar mounting conditions.
What is the maximum power output of the RS8V-M-FB module, and is it a bifacial panel?
The RS8V-M-FB module reaches a maximum power output of 435 Wp. It is a mono-facial panel, not bifacial, meaning it generates energy only from its front surface. This is a standard and sufficient solution for most rooftop installations, where bifacial panels would not provide additional benefits.
Are RS8V-M-FB panels resistant to harsh conditions such as strong wind, snow, or salt air?
Yes, the modules are certified for high wind and snow load resistance, as well as resistance to salt mist and ammonia exposure, making them suitable for both coastal installations and agricultural sites near livestock facilities. Additionally, high PID resistance limits power degradation over time.
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