Skip to main content
Resun Solar RS7I-425M
Resun Solar Brand review

RS7I-425M

425 Wp Monocrystalline
ComparePV verdict

Middle of its segment, modest efficiency

Rank 11,989 of 14,005
Compare panels Datasheet PDF
Power (Wp)
425
Typical for its class
Efficiency (%)
19.24
Weak · bottom 8%
Density (Wp/m²)
195.5
Weak · bottom 10%
Temp (%/°C)
-0.340
Typical · median -0.300
Weight (kg)
25.0
Weak · 2.0 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The RS7I-M series from Resun Solar is built for investors who expect a photovoltaic installation to hold up reliably under demanding weather conditions typical of the Polish climate. The panels use monocrystalline silicon cells combined in a half-cut and multi-busbar layout, which reduces internal current losses and boosts efficiency compared to conventional designs. Splitting the cells into halves makes the module far less prone to power loss from partial shading, effectively protecting against hot-spot formation and extending the lifespan of the installation. The RS7I-M is engineered for high resistance to snow and wind loads, making it a solid choice for both pitched residential roofs and flat commercial buildings exposed to harsh weather. Tempered front glass adds further protection against mechanical damage, including hail impact. The series carries PID-free certification, eliminating the risk of potential-induced degradation and ensuring stable energy output throughout the system's operating life. The RS7I-M works well both for prosumer installations and larger commercial projects where price-to-reliability ratio and predictable energy yield under variable sunlight conditions matter most.

Ranking

6,953 panels in the 325-525 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 19.24% 21.50% Weak · bottom 8% 12,843
Power density 195.5 215.1 Weak · bottom 10% 12,623
Temperature coefficient -0.340 -0.300 Typical 8,778
Weight per kWp 58.8 52.9 Weak · bottom 15% 11,913
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, shaded-installations and cold-climate.

Not ideal for

Tight roof space, roofs where every square metre has to count and weight-limited structures.

Watch-outs
19.24% module efficiency

Bottom 8% of the 325-525 W band, against a median of 21.50%. Ranked 12,843rd in the whole database.

195.5 watts per square metre

Bottom 10% of the 325-525 W band, against a median of 215.1.

58.8 kg per kWp

Bottom 15% of the 325-525 W band, against a median of 52.9.

Notes from the database
  • Efficiency of 19.2% is 2.6pp below the database median (21.8%)
  • Power density of 195.5 W/m² is 22.6 W/m² below database median (218.1 W/m²) - needs more roof space
  • -0.34%/°C temperature coefficient - 0.04pp worse than database median (-0.30%/°C), expect higher hot weather losses
  • At 25.0 kg, this panel is 1.5 kg lighter than database median (26.5 kg) - easier handling during installation
  • #12843 for efficiency, #8778 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 425 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 19.24 % Weak Segment median 21.50%
Vmpp · Impp 40.50 V · 10.50 A Operating point at max power
Voc · Isc 48.30 V · 11.23 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2094×1038×35 mm · 2.17 m² of roof
Weight 25.0 kg Weak Weak · 2.0 kg above median
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 RS7I-425M 425 W 19.24% -0.340 25.0 kg You are here
SPR-MAX7-475 475 W 24.00% -0.270 21.1 kg Cooler, +4.8 pp, +10 yr warranty
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg Cooler, lighter, +4.6 pp
JAT54S40-475/LR 475 W 23.80% -0.260 19.3 kg Cooler, lighter, +4.6 pp
TWMNH-48HW475 475 W 23.80% -0.280 23.7 kg +50 W, cooler, +4.6 pp
CHSM48RN(DG)/F-BH-475 475 W 23.80% -0.290 24.5 kg +50 W, cooler, +4.6 pp
AIKO-A475-MCE54Mw 475 W 23.80% -0.260 21.0 kg +50 W, cooler, +4.6 pp
AIKO-A475-MAH54Mw 475 W 23.80% -0.260 21.5 kg +50 W, cooler, +4.6 pp
RS7I-430M 430 W 19.46% -0.340 25.0 kg +0.2 pp
RS7I-435M 435 W 19.69% -0.340 25.0 kg +10 W, +0.5 pp
RS7I-440M 440 W 19.91% -0.340 25.0 kg +15 W, +0.7 pp
RS7I-445M 445 W 20.14% -0.340 25.0 kg +20 W, +0.9 pp
RS7I-450M-BD 450 W 20.70% -0.390 25.5 kg +25 W, hotter, +1.5 pp
RS7I-455M 455 W 20.93% -0.340 25.0 kg +30 W, +1.7 pp
RS7I-460M 460 W 21.16% -0.340 25.0 kg +35 W, +1.9 pp
GKA120N-PRO-590W 590 W 23.82% -0.300 26.7 kg +165 W, cooler, +4.6 pp
GKA120N-PRO-585W 585 W 23.62% -0.300 26.7 kg +160 W, cooler, +4.4 pp

Found 234 panels of the same or similar size to this one, within ±10 mm. See them here Found 325 panels of the same or similar size to this one, within ±25 mm. See them here Found 352 panels of the same or similar size to this one, within ±50 mm. See them here Found 1158 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
Is the Resun Solar RS7I-M series still available for purchase?
The RS7I-M series has been discontinued and is no longer manufactured as part of the current product lineup. Panels may still be available through distributors with remaining stock, but once inventory is depleted, identical modules will no longer be obtainable. Anyone looking to expand an existing installation should contact their supplier promptly to check current availability.
What warranty comes with Resun Solar RS7I-M panels?
The manufacturer backs the RS7I-M series with a 12-year product warranty covering material and workmanship defects, plus a 30-year linear power output warranty. This means the panel is designed to retain a guaranteed percentage of its original output even after three decades of use, giving investors predictable long-term performance for ROI planning.
How does half-cut cell technology in the RS7I-M differ from standard monocrystalline panels?
In the RS7I-M, monocrystalline cells are cut in half and connected using a multi-busbar layout, reducing internal resistance and current losses compared to full-size cells. This design lowers the risk of hot-spot formation under partial shading and improves overall module efficiency without significantly changing the panel's external dimensions.
Are RS7I-M panels suitable for roofs exposed to heavy snow loads?
Yes, the RS7I-M was engineered for high resistance to snow and wind loads, making it a solid choice for the Polish climate. Its tempered front glass provides additional protection against mechanical damage, including hail impact, which matters for sloped roofs exposed to extreme weather conditions.
What is the maximum power output of the RS7I-M, and what installations is it suited for?
RS7I-M panels reach a maximum output of up to 460 Wp, making them a versatile choice for both residential prosumer installations and larger commercial projects. With a strong price-to-reliability ratio and PID-free certification, the series delivers stable, predictable energy yield even under variable sunlight conditions.
What does PID-free certification mean for RS7I-M panels, and why does it matter?
PID-free certification confirms that RS7I-M panels resist potential-induced degradation, a phenomenon that gradually reduces module output due to voltage differences within the system. This protection ensures stable energy production throughout the panel's lifespan, avoiding the sudden performance drops common in cheaper, non-certified modules.
Add to compare