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Resun Solar Brand review

RS6I-420M

420 Wp Monocrystalline
ComparePV verdict

Solid all-round for its segment

Rank 11,003 of 14,005
Compare panels Datasheet PDF
Power (Wp)
420
Typical for its class
Efficiency (%)
20.87
Typical · median 21.50%
Density (Wp/m²)
208.7
Typical · median 215.0
Temp (%/°C)
-0.340
Typical · median -0.300
Weight (kg)
22.5
Typical · median 23.0 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

6,930 panels in the 320-520 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 20.87% 21.50% Typical 10,332
Power density 208.7 215.0 Typical 10,282
Temperature coefficient -0.340 -0.300 Typical 8,778
Weight per kWp 53.6 53.0 Typical 7,586
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 · 0 caution
Best for

Residential, commercial and shaded-installations.

Notes from the database
  • Efficiency of 20.9% is 1.0pp below the database median (21.8%)
  • 208.8 W/m² power density is 9.3 W/m² below database median (218.1 W/m²) - requires larger installation area
  • Temperature coefficient of -0.34%/°C is 0.04pp worse than database median (-0.30%/°C) - higher losses in summer heat
  • Weight of 22.5 kg (4.0 kg below database median of 26.5 kg) allows easier transport and roof mounting
  • Ranked #10332 out of 14005 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 420 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 20.87 % Typical Segment median 21.50%
Vmpp · Impp 40.90 V · 10.27 A Operating point at max power
Voc · Isc 50.20 V · 10.61 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 23.0 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-420M 420 W 20.87% -0.340 22.5 kg You are here
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg +45 W, cooler, +2.9 pp
LX-465M/182R-96+ GG 465 W 23.80% -0.260 23.5 kg +45 W, cooler, +2.9 pp
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg Cooler, +2.8 pp, +10 yr warranty
AIKO-A470-MAH54Mb 470 W 23.60% -0.260 21.5 kg +50 W, cooler, +2.7 pp
AIKO-A460-MAH54Mb 460 W 23.60% -0.290 20.5 kg +40 W, cooler, +2.7 pp
HSM-BD54-LA470 470 W 23.60% -0.260 21.5 kg +50 W, cooler, +2.7 pp
RS6I-390M 390 W 19.38% -0.340 22.5 kg -30 W, -1.5 pp
RS6I-395M 395 W 19.63% -0.340 22.5 kg -25 W, -1.2 pp
RS6I-400M 400 W 19.88% -0.340 22.5 kg -20 W, -1.0 pp
RS6I-405M 405 W 20.13% -0.340 22.5 kg -15 W, -0.7 pp
RS6I-410M 410 W 20.38% -0.340 22.5 kg -10 W, -0.5 pp
RS6I-415M 415 W 20.63% -0.340 22.5 kg -0.2 pp
SPR-MAX7-475 475 W 24.00% -0.270 21.1 kg Cooler, +3.1 pp, +10 yr warranty
SPR-MAX7-465 465 W 23.50% -0.270 21.1 kg Cooler, +2.6 pp, +10 yr warranty
MS480NC-HJTPBFT 480 W 22.10% -0.260 23.0 kg +60 W, cooler, +1.2 pp
LG440QAC-A6 440 W 22.10% -0.290 20.5 kg Cooler, +1.2 pp, -5 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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