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Resun Solar Brand review

RS6I-405M

405 Wp Monocrystalline
ComparePV verdict

Middle of its segment, needs the roof space

Rank 11,771 of 14,005
Compare panels Datasheet PDF
Power (Wp)
405
Typical for its class
Efficiency (%)
20.13
Weak · bottom 20%
Density (Wp/m²)
201.3
Weak · bottom 20%
Temp (%/°C)
-0.340
Typical · median -0.300
Weight (kg)
22.5
Typical · median 22.6 kg
Warranty (yrs)
30
Typical · median 30 yrs

The RS6I-M series from Resun Solar consists of monocrystalline modules built on half-cut cell technology paired with a 9-busbar metallization grid, addressing one of the most common issues in PV installations: power loss caused by cell microcracks and partial shading. Splitting the cells in half and increasing the busbar count reduces internal current losses within the module and minimizes the risk of hot-spot formation, resulting in higher and more stable energy output under real-world operating conditions. The panels stand out for their high resistance to PID, which limits power degradation over time and keeps the levelized cost of energy (LCOE) lower throughout the module's service life. The use of tempered glass with high light transmittance delivers solid low-light performance, while certified resistance to salt mist and ammonia makes the series suitable for both rooftop installations and large-scale PV farms in harsh environmental conditions. An additional advantage is the high mechanical strength of the frame against wind and snow loads, improving installation safety. The RS6I-M series is a good fit for investors looking for proven, reliable technology at a reasonable budget, without having to reach for premium TOPCon or HJT solutions.

Ranking

6,665 panels in the 305-505 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 20.13% 21.30% Weak · bottom 20% 12,089
Power density 201.3 212.8 Weak · bottom 20% 12,081
Temperature coefficient -0.340 -0.300 Typical 8,778
Weight per kWp 55.6 53.2 Typical 9,899
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

Residential, commercial and shaded-installations.

Not ideal for

Roofs where every square metre has to count and tight roof space.

Watch-outs
201.3 watts per square metre

Bottom 20% of the 305-505 W band, against a median of 212.8.

20.13% module efficiency

Bottom 20% of the 305-505 W band, against a median of 21.30%.

Notes from the database
  • Efficiency of 20.1% is 1.7pp below the database median (21.8%)
  • At 201.3 W/m², this panel generates 16.8 W/m² less per unit area than database median (218.1 W/m²)
  • Temperature coefficient of -0.34%/°C is 0.04pp worse than database median (-0.30%/°C) - higher losses in summer heat
  • 22.5 kg weight - 4.0 kg lighter than database median (26.5 kg), reducing installation effort
  • Ranked #12089 out of 14005 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 405 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 20.13 % Weak Segment median 21.30%
Vmpp · Impp 40.30 V · 10.05 A Operating point at max power
Voc · Isc 49.60 V · 10.40 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2008×1002×35 mm · 2.01 m² of roof
Weight 22.5 kg Typical Typical · median 22.6 kg
Cells 144 Monocrystalline
Coefficient Pmax -0.340 %/°C Typical median -0.300 of its segment
Coefficient Voc · Isc -0.320 · 0.050 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 12 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
-0.340 %/°C against a segment median of -0.300
-

Alternatives

All Resun Solar panels
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Resun Solar RS6I-405M 405 W 20.13% -0.340 22.5 kg You are here
AIKO-455-MAH54Db 455 W 23.30% -0.260 24.0 kg +50 W, cooler, +3.2 pp
LR5-54HTH-455M 455 W 23.30% -0.290 20.8 kg +50 W, cooler, +3.2 pp
YL455CF54 e/2 455 W 23.30% -0.290 20.3 kg +50 W, cooler, +3.2 pp
ESM-455T 455 W 23.30% -0.310 21.0 kg +50 W, cooler, +3.2 pp
SE5-54HBC-455W 455 W 23.30% -0.290 20.8 kg +50 W, cooler, +3.2 pp
JST-EDMH-(445-465)W-TD (455W class) 455 W 23.30% -0.300 20.5 kg +50 W, cooler, +3.2 pp
LX-455M/182R-96+ GG 455 W 23.30% -0.260 23.5 kg +50 W, cooler, +3.2 pp
RS6I-390M 390 W 19.38% -0.340 22.5 kg -15 W, -0.8 pp
RS6I-395M 395 W 19.63% -0.340 22.5 kg -10 W, -0.5 pp
RS6I-400M 400 W 19.88% -0.340 22.5 kg -0.2 pp
RS6I-410M 410 W 20.38% -0.340 22.5 kg +0.2 pp
RS6I-415M 415 W 20.63% -0.340 22.5 kg +10 W, +0.5 pp
RS6I-420M 420 W 20.87% -0.340 22.5 kg +15 W, +0.7 pp
SPR-MAX7-475 475 W 24.00% -0.270 21.1 kg Cooler, +3.9 pp, +10 yr warranty
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg Cooler, +3.6 pp, +10 yr warranty
SPR-MAX7-465 465 W 23.50% -0.270 21.1 kg Cooler, +3.4 pp, +10 yr warranty

Found 135 panels of the same or similar size to this one, within ±10 mm. See them here Found 206 panels of the same or similar size to this one, within ±25 mm. See them here Found 318 panels of the same or similar size to this one, within ±50 mm. See them here Found 791 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
Is the Resun Solar RS6I-M series still available for purchase?
The RS6I-M series has been discontinued by Resun Solar and replaced by newer models. It can currently be purchased only from remaining distributor stock, while supplies last. It's worth checking current availability with a seller, since once existing batches sell out, no further units will be produced.
What warranty comes with Resun Solar RS6I-M panels?
The manufacturer provides a 12-year product warranty covering material and workmanship defects, plus a 30-year linear power output warranty. This means the module should retain a guaranteed minimum generation level even after many years of use, giving installers and owners a predictable return on investment.
How does half-cut technology in the RS6I-M differ from standard full-size cells?
Half-cut technology splits cells in half, reducing internal current losses and resistance within the module. This helps the RS6I-M handle partial shading better - covering half a cell string doesn't knock out the entire row from production, unlike older full-cell designs. The 9-busbar metallization grid further reduces microcrack risk and improves long-term power stability.
Are RS6I-M panels suitable for harsh environments, such as coastal installations?
Yes, the RS6I-M series is certified for resistance to salt mist and ammonia corrosion, making it suitable for coastal installations and agricultural sites exposed to nitrogen compounds. High PID resistance further limits power degradation caused by leakage current, which is common in humid and salty environments.
What is the maximum power output of the RS6I-M, and is that competitive for a monocrystalline panel?
RS6I-M modules reach up to 420 Wp of maximum power. This is a solid result within the standard monocrystalline PERC half-cut segment, though lower than the latest TOPCon or HJT modules. For a typical rooftop installation, this offers a good power-to-area ratio at a reasonable purchase price.
Is it worth choosing RS6I-M over more expensive TOPCon or HJT panels?
RS6I-M is a proven, budget-conscious choice for investors who want reliability without paying premium prices - its high PID resistance and solid power warranty ensure stable performance over the years. TOPCon or HJT panels offer higher efficiency and better high-temperature performance, but at a higher cost. RS6I-M is a good fit where investment cost matters more than maximum output per square meter.
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