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Resun Solar Brand review

RS8I-555M-F30

555 Wp Monocrystalline
ComparePV verdict

Light for its output, weak in heat

Rank 5,774 of 14,005
Compare panels Datasheet PDF
Power (Wp)
555
Typical for its class
Efficiency (%)
21.50
Typical · median 22.30%
Density (Wp/m²)
214.8
Typical · median 222.8
Temp (%/°C)
-0.390
Weak · bottom 1%
Weight (kg)
27.2
Strong · 1.8 kg below median
Warranty (yrs)
30
Typical · median 30 yrs

The RS8I-M HALF-CELL series consists of monocrystalline photovoltaic modules built with large 182 mm silicon wafers, split using half-cut cell technology. This design significantly reduces power losses caused by partial shading and protects the module against hot-spot effects, translating into greater durability under demanding operating conditions. The use of a multi-busbar grid combined with PERC technology and high-density encapsulation ensures stable performance even in low-light environments - mornings, evenings, and cloudy days. RS8I-M panels perform reliably in installations exposed to strong wind and heavy snow loads, making them well suited to coastal regions, continental climates, or roofs with challenging geometry. This solution is aimed both at private investors seeking high power density on limited roof space and at installation companies expanding existing PV systems. Its enhanced mechanical resistance and certification in line with international IEC standards make the RS8I-M series a solid choice for residential and commercial installations where reliability and efficient use of available mounting space both matter.

Ranking

7,234 panels in the 455-655 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 21.50% 22.30% Typical 7,958
Power density 214.8 222.8 Typical 8,034
Temperature coefficient -0.390 -0.300 Weak · bottom 1% 13,579
Weight per kWp 49.0 52.7 Strong · top 23% 2,682
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 · 1 caution
Best for

Residential, commercial and shaded-installations.

Not ideal for

Hot climates.

Strengths
49.0 kg per kWp

Top 23% of the 455-655 W band, against a median of 52.7.

Watch-outs
-0.390 %/°C temperature coefficient

Bottom 1% of the 455-655 W band, against a median of -0.300. Ranked 13,579th in the whole database.

Notes from the database
  • Efficiency of 21.5% matches the database median
  • 214.8 W/m² power density is 3.2 W/m² below database median (218.1 W/m²) - requires larger installation area
  • -0.39%/°C temperature coefficient - 0.09pp worse than database median (-0.30%/°C), expect higher hot weather losses
  • Ranked #7958 out of 14005 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 555 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.50 % Typical Segment median 22.30%
Vmpp · Impp 42.06 V · 13.19 A Operating point at max power
Voc · Isc 49.98 V · 14.03 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2278×1134×30 mm · 2.58 m² of roof
Weight 27.2 kg Strong Strong · 1.8 kg below median
Cells 144 Monocrystalline
Coefficient Pmax -0.390 %/°C Weak bottom 1% 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
-0.390 %/°C against a segment median of -0.300
-

Alternatives

All Resun Solar panels
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Resun Solar RS8I-555M-F30 555 W 21.50% -0.390 27.2 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg -45 W, cooler, +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 -50 W, cooler, +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, 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 -20 W, cooler, -0.8 pp
RS8I-540M-BD 540 W 20.94% -0.390 29.0 kg -15 W, heavier, -0.6 pp
RS8I-M HC-540 540 W 20.89% -0.340 28.6 kg -15 W, cooler, -0.6 pp
RS8I-545M-BD 545 W 21.13% -0.390 29.0 kg -10 W, heavier, -0.4 pp
RS8I-M HC-545 545 W 21.09% -0.340 28.6 kg Cooler, heavier, -0.4 pp
RS8I-M FULL BLACK 550W 550 W 21.28% -0.390 28.6 kg Heavier, -0.2 pp
RS8I-M HC-555 555 W 21.47% -0.340 28.6 kg Cooler, heavier
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg +95 W, cooler, +3.7 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg +90 W, cooler, +3.5 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg +85 W, cooler, +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 2547 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 HALF-CELL panels?
The RS8I-M HALF-CELL series reaches a maximum power output of up to 575 Wp. This is achieved through large 182 mm monocrystalline cells using half-cut technology and dense module encapsulation, resulting in high power density on a relatively compact panel footprint. This means fewer modules are needed to reach a given system capacity compared to older module designs.
How does half-cell technology differ from standard photovoltaic panels?
Half-cell technology involves cutting a standard silicon cell in half, which reduces current losses and limits the hot-spot effect under partial shading, for example from a chimney or antenna. In the RS8I-M series, this is combined with a multi-busbar grid and PERC technology, delivering higher efficiency and better resilience under challenging operating conditions compared to classic full-cell modules.
What warranty comes with the Resun Solar RS8I-M HALF-CELL panels?
The manufacturer provides a 15-year product warranty along with a 30-year power output warranty. This means the module maintains its rated power generation level, as specified in the datasheet, over three decades, while the 15-year period covers the manufacturer's responsibility for material and workmanship defects in the panel itself.
Are RS8I-M HALF-CELL panels suitable for installations exposed to strong wind and heavy snow loads?
Yes, the RS8I-M series features an enhanced mechanically robust construction, making it suitable for coastal installations, continental climates, and roofs subject to heavy snow loads. The panels are certified in accordance with international IEC standards, confirming their resistance to wind and snow loads typical of demanding climatic conditions in Central Europe.
Is the RS8I-M HALF-CELL series a bifacial panel?
No, the RS8I-M HALF-CELL series consists of mono-facial modules, not bifacial ones. This means they generate electricity solely from irradiance hitting the front surface, which is a standard and proven solution for typical rooftop installations where the rear side of the panel would not have access to reflected light anyway.
Who are the Resun Solar RS8I-M HALF-CELL panels designed for?
The RS8I-M HALF-CELL series suits both private investors looking for high power density on a limited roof area, as well as installation companies expanding existing PV systems. With power ratings up to 575 Wp and resilience to demanding weather conditions, these panels are a versatile choice for both residential and commercial installations.
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