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Resun Solar RS6K-305P
Resun Solar Brand review

RS6K-305P

305 Wp Polycrystalline
ComparePV verdict

Warranty pick, weak in heat

Rank 13,291 of 14,129
Compare panels Datasheet PDF
Power (Wp)
305
Weak · bottom 18%
Efficiency (%)
18.08
Typical · median 19.60%
Density (Wp/m²)
180.8
Typical · median 196.1
Temp (%/°C)
-0.390
Weak · bottom 12%
Weight (kg)
19.0
Typical · median 21.0 kg
Warranty (yrs)
30
Strong · top 17%

The RS6K-P series consists of polycrystalline solar modules built using half-cell technology, which effectively reduces power losses caused by micro-cracks and damaged busbars. The use of multi-busbar technology with five collecting bars per cell improves current conduction and boosts conversion efficiency, while also increasing the panel's resistance to the development of micro-damage over its service life. By splitting the cells in half, the module is significantly less susceptible to the hot-spot effect caused by partial shading, which meaningfully extends its lifespan in demanding installation conditions. These panels also stand out for their strong PID resistance, ensuring stable energy output throughout the operating period and helping to lower the levelized cost of energy (LCOE). The 3.2mm tempered glass with an anti-reflective coating delivers solid low-light performance, which matters on overcast days and during early morning or dusk hours. An anodized aluminum frame provides high mechanical strength, certified for resistance to wind and snow loads as well as salt mist and ammonia exposure. This makes the series a solid choice for installers and investors looking for reliable, durable panels for rooftop and ground-mount applications, backed by a long-term linear power warranty.

Ranking

2,063 panels in the 205-405 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 18.08% 19.60% Typical 13,316
Power density 180.8 196.1 Typical 13,287
Temperature coefficient -0.390 -0.350 Weak · bottom 12% 13,659
Weight per kWp 62.3 58.5 Typical 12,856
Performance warranty 30 yrs 25 yrs Strong · top 17% 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

6 positive · 4 caution
Best for

Residential and shaded-installations.

Not ideal for

Hot climates.

Strengths
30 year performance warranty

Top 17% of the 205-405 W band, against a median of 25 yrs.

Watch-outs
-0.390 %/°C temperature coefficient

Bottom 12% of the 205-405 W band, against a median of -0.350.

What owners get
Half-cell cells limit microcracks

Splitting cells in half reduces power loss from microcracks and damaged busbars, and significantly lowers susceptibility to hot-spot effects under partial shading, extending module lifespan in challenging installation conditions.

5-busbar current collection technology

Five busbars per cell improve current conduction and raise conversion efficiency (16.89-18.37%), while increasing resistance to microdamage propagation over years of operation.

High resistance to PID degradation

Stable grid power output throughout the module's service life lowers effective levelized cost of energy (LCOE) and minimizes the risk of unexpected yield drops in utility-scale installations.

30-year linear power warranty

A power warranty extended to 30 years exceeds the standard 25 years offered by many segment competitors (e.g., AE Solar Terra E, Selfa SV120M.3.2), improving ROI predictability for investors.

Reinforced mechanical construction

Anodized aluminum framing and 3.2 mm tempered anti-reflective glass, certified against wind, snow, salt mist, and ammonia exposure, make the series suitable for rooftop and ground-mount installations in demanding environments.

Trade-offs
Polycrystalline tech instead of mono

Maximum efficiency of 18.37% trails the monocrystalline peer Canadian Solar KuBlack CS3K-MS (18.7% at the same 310 Wp max power). The PV market has been shifting away from polycrystalline toward mono PERC/TOPCon for several years, which may limit future availability of service components.

No bifacial variant available

The series is monofacial only (is_bifacial: false), while some competitors in the segment (including Resun's own DG variants and other manufacturers) offer bifacial modules delivering an extra 5-10% yield from ground albedo - RS6K-P does not capture this potential.

12-year product warranty at the market floor

The 12-year product warranty sits at the lower end of tier-1/tier-2 segment standards - many manufacturers have already moved to 15-year product warranties while keeping comparable 25-30-year linear power warranties.

Notes from the database
  • At 18.1% efficiency, this panel is 3.8pp below the database median of 21.8%
  • At 180.8 W/m², this panel generates 37.3 W/m² less per unit area than database median (218.1 W/m²)
  • Temperature coefficient of -0.39%/°C is 0.09pp worse than database median (-0.30%/°C) - higher losses in summer heat
  • Weight of 19.0 kg (7.5 kg below database median of 26.5 kg) allows easier transport and roof mounting
  • In the top 94% for efficiency among all N-type panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 305 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 18.08 % Typical Segment median 19.60%
Vmpp · Impp 32.40 V · 9.41 A Operating point at max power
Voc · Isc 39.60 V · 9.82 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1684×1002×35 mm · 1.69 m² of roof
Weight 19.0 kg Typical Typical · median 21.0 kg
Cells 120 Polycrystalline
Coefficient Pmax -0.390 %/°C Weak bottom 12% 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 Strong top 17% · median 25 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 -0.350
-

Alternatives

All Resun Solar panels
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Resun Solar RS6K-305P 305 W 18.08% -0.390 19.0 kg You are here
LNSK-340M 340 W 20.08% -0.360 21.0 kg +35 W, +2.0 pp, -5 yr warranty
CS3K-330P 330 W 19.90% -0.360 18.5 kg Cooler, +1.8 pp, -5 yr warranty
CS3K-335MB-AG 335 W 19.90% -0.360 22.3 kg Cooler, heavier, +1.8 pp
LNSK-335M 335 W 19.78% -0.360 21.0 kg Cooler, +1.7 pp, -5 yr warranty
CS3K-325P 325 W 19.60% -0.360 18.5 kg Cooler, +1.5 pp, -5 yr warranty
LNSK-330M 330 W 19.49% -0.360 21.0 kg Cooler, +1.4 pp, -5 yr warranty
CS3K-320P 320 W 19.30% -0.360 18.5 kg Cooler, +1.2 pp, -5 yr warranty
RS6K-285P 285 W 16.89% -0.390 19.0 kg -20 W, -1.2 pp
RS6K-290P 290 W 17.19% -0.390 19.0 kg -15 W, -0.9 pp
RS6K-295P 295 W 17.48% -0.390 19.0 kg -10 W, -0.6 pp
RS6K-300P 300 W 17.78% -0.390 19.0 kg -0.3 pp
RS6K-310P 310 W 18.37% -0.390 19.0 kg +0.3 pp
RS6K-325M 325 W 19.26% -0.340 19.0 kg +20 W, cooler, +1.2 pp
RS6K-330M 330 W 19.56% -0.340 19.0 kg +25 W, cooler, +1.5 pp
JT440SYK(B) 440 W 22.90% -0.240 23.0 kg +135 W, cooler, +4.8 pp
JT435SYk(B) 435 W 22.70% -0.240 23.0 kg +130 W, cooler, +4.6 pp

Found 114 panels of the same or similar size to this one, within ±10 mm. See them here Found 224 panels of the same or similar size to this one, within ±25 mm. See them here Found 470 panels of the same or similar size to this one, within ±50 mm. See them here Found 814 panels of the same or similar size to this one, within ±100 mm. See them here

About the RS6K-P series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this module's own.

What is the maximum power output of the RS6K-P series panels?
RS6K-P series panels reach a maximum power output of up to 310 Wp. This is achieved through half-cell technology combined with five busbars per cell, which together improve current conduction and reduce power losses. For a typical residential installation, this translates into stable performance within a relatively compact module footprint.
How does half-cell technology in RS6K-P differ from standard full-size cells?
In half-cell technology, each silicon cell is cut in half, so the current flowing through each segment is lower, reducing resistive and thermal losses. In practice this results in higher conversion efficiency and greater resistance to microcracks and hot-spot effects caused by partial shading, extending the panel's lifespan in challenging installation conditions.
What warranty does Resun Solar offer on the RS6K-P panels?
Resun Solar provides a 12-year product warranty and a 30-year linear power output warranty. This means the panel maintains its declared percentage of rated power throughout this period, with annual degradation contractually limited, which improves the predictability of return on investment.
Are RS6K-P panels suitable for installations in dusty areas or near the coast?
Yes, RS6K-P modules are certified for resistance to salt mist and ammonia vapor, making them suitable for both coastal installations and agricultural settings, such as near livestock farms. Additionally, the anodized aluminum frame and 3.2 mm tempered glass provide strong mechanical resistance to wind and snow loads.
Do RS6K-P panels perform well in low-light conditions, such as winter or dusk?
Yes, thanks to the 3.2 mm tempered glass with an anti-reflective coating, RS6K-P modules deliver good performance under low irradiance. This matters on cloudy days, early mornings, and late afternoons, when light is diffused or hits the panel at an unfavorable angle.
Is the RS6K-P series susceptible to PID degradation, and what does that mean for investors?
No, RS6K-P panels are engineered with high resistance to PID (potential induced degradation), a phenomenon where leakage current at high string voltage causes power loss over time. As a result, energy output to the grid remains stable throughout the system's lifetime, lowering effective LCOE and increasing confidence in projected installation revenues.
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