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Resun Solar RS6C-285P
Resun Solar Brand review

RS6C-285P

285 Wp Polycrystalline
ComparePV verdict

Warranty pick, weak in heat

Rank 13,476 of 14,129
Compare panels Datasheet PDF
Power (Wp)
285
Weak · bottom 22%
Efficiency (%)
17.40
Typical · median 18.88%
Density (Wp/m²)
175.2
Typical · median 188.2
Temp (%/°C)
-0.390
Weak · bottom 18%
Weight (kg)
19.0
Typical · median 20.0 kg
Warranty (yrs)
30
Strong · top 19%

The RS6C-P series is a proven solution for grid-connected installations, built on classic 156x156 mm polycrystalline cells arranged 60 per module (6x10), split by five busbars for better current collection and lower resistive losses. The module stands out with its anti-reflective, hydrophobic coating, which improves light absorption and reduces surface dust buildup, resulting in more stable output even during morning and evening diffuse light or on cloudy days. The design was engineered for harsh operating conditions - coastal areas, deserts and lakeside sites - thanks to high resistance to wind and snow loads. The panel carries PID-free certification, eliminating the risk of potential-induced degradation and ensuring long-term power stability. An additional advantage is the linear power warranty with a very low annual efficiency drop, making the RS6C-P a solid choice for investors expecting predictable returns from their installation over many years. It is a fitting option for anyone looking for proven, robust poly technology without compromising on durability or build quality.

Ranking

1,430 panels in the 185-385 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 17.40% 18.88% Typical 13,475
Power density 175.2 188.2 Typical 13,439
Temperature coefficient -0.390 -0.360 Weak · bottom 18% 13,659
Weight per kWp 66.7 61.8 Typical 13,293
Performance warranty 30 yrs 25 yrs Strong · top 19% 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

6 positive · 4 caution
Best for

Residential.

Not ideal for

Hot climates.

Strengths
30 year performance warranty

Top 19% of the 185-385 W band, against a median of 25 yrs.

Watch-outs
-0.390 %/°C temperature coefficient

Bottom 18% of the 185-385 W band, against a median of -0.360.

What owners get
Higher efficiency than comparable poly modules

At 16.7% efficiency, the RS6C-P outperforms direct peers in the same power class, such as Kyocera KK270P (16.4%) and KU-60 1000V series (16.41%), making it one of the stronger results among classic polycrystalline 270 Wp modules.

PID-free certification

The module is certified free from potential-induced degradation (PID), eliminating power losses caused by leakage current to the frame/ground and ensuring more stable operation in large grid-tied systems with high system voltage.

5 busbars reducing resistive losses

The 5-busbar design (versus the standard 3 busbars on older poly modules) reduces resistive losses and improves current collection from the cell, resulting in genuinely higher daily energy yield.

30-year linear power warranty

The manufacturer guarantees a minimum of 80% nominal power output after 30 years (90% after 12 years), which was competitive versus the typical 25-year linear warranties offered by tier-1 manufacturers at the time of release.

Anti-reflective, hydrophobic coating

The additional coating limits soiling buildup and improves absorption of diffuse light, giving more stable energy production under low-irradiance conditions (early morning, dusk, overcast days).

Trade-offs
Discontinued product line

The RS6C-P series has been discontinued, meaning limited availability of identical replacement modules for warranty claims or system expansion, and potential difficulties fulfilling the long-term product warranty.

Efficiency well below modern mono modules

At 16.7% efficiency, the module trails a comparable DMEGC DMxxxM10T-B32HBT (22.9%) of the same 270 Wp power class by roughly 6.2 percentage points - for the same energy output, the RS6C-P requires significantly more roof area, limiting its appeal where mounting space is constrained.

Shorter product warranty than current market leaders

The 12-year product warranty is shorter than the 15-25 year standard now offered by tier-1 manufacturers using TOPCon/HJT technology, providing investors with less long-term protection against material and workmanship defects.

Notes from the database
  • Efficiency of 17.4% is 4.4pp below the database median (21.8%)
  • At 175.2 W/m², this panel generates 42.9 W/m² less per unit area than database median (218.1 W/m²)
  • At -0.39%/°C, loses 0.09pp more power per degree than database median (-0.30%/°C)
  • Weight of 19.0 kg (7.5 kg below database median of 26.5 kg) allows easier transport and roof mounting
  • In the top 95% for efficiency among all N-type panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 285 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 17.40 % Typical Segment median 18.88%
Vmpp · Impp 31.60 V · 9.02 A Operating point at max power
Voc · Isc 38.30 V · 9.49 A Sizes the string length
Max system voltage 1000 V Longer strings than 1000 V modules
Dimensions 1640×992×35 mm · 1.63 m² of roof
Weight 19.0 kg Typical Typical · median 20.0 kg
Cells 60 Polycrystalline
Coefficient Pmax -0.390 %/°C Weak bottom 18% 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 19% · 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 -0.360
-

Alternatives

All Resun Solar panels
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Resun Solar RS6C-285P 285 W 17.40% -0.390 19.0 kg You are here
CS3K-330P 330 W 19.90% -0.360 18.5 kg +45 W, +2.5 pp, -5 yr warranty
CS3K-335MB-AG 335 W 19.90% -0.360 22.3 kg +50 W, heavier, +2.5 pp
LNSK-335M 335 W 19.78% -0.360 21.0 kg +50 W, +2.4 pp, -5 yr warranty
CS3K-325P 325 W 19.60% -0.360 18.5 kg +40 W, +2.2 pp, -5 yr warranty
LNSK-330M 330 W 19.49% -0.360 21.0 kg +45 W, +2.1 pp, -5 yr warranty
CS3K-320P 320 W 19.30% -0.360 18.5 kg +35 W, +1.9 pp, -5 yr warranty
LNSK-325M 325 W 19.19% -0.360 21.0 kg +40 W, +1.8 pp, -5 yr warranty
RS6C270P 270 W 16.60% -0.390 19.0 kg -15 W, -0.8 pp
RS6C-275P 275 W 16.80% -0.390 19.0 kg -10 W, -0.6 pp
RS6C-280P 280 W 17.10% -0.390 19.0 kg -0.3 pp
RS6C-290P 290 W 17.83% -0.390 19.0 kg +0.4 pp
RS6C-300M 300 W 18.44% -0.390 19.0 kg +15 W, +1.0 pp
RS6C-305M 305 W 18.74% -0.390 19.0 kg +20 W, +1.3 pp
RS6C-310M 310 W 19.05% -0.390 19.0 kg +25 W, +1.7 pp
RS6C-315M 315 W 19.36% -0.390 19.0 kg +30 W, +2.0 pp
RS6C-320M 320 W 19.67% -0.390 19.0 kg +35 W, +2.3 pp
SPR-MAX3-400-COM 400 W 22.60% -0.270 19.0 kg +115 W, cooler, +5.2 pp

Found 191 panels of the same or similar size to this one, within ±10 mm. See them here Found 227 panels of the same or similar size to this one, within ±25 mm. See them here Found 394 panels of the same or similar size to this one, within ±50 mm. See them here Found 487 panels of the same or similar size to this one, within ±100 mm. See them here

About the RS6C-P series

6 answered

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

Is the Resun Solar RS6C-P 270 Wp panel still available for purchase?
The RS6C-P series has been discontinued and is no longer manufactured by Resun Solar. It may still be found through distributors clearing remaining stock or on the secondary market. Anyone planning to expand an existing installation built on this module should expect limited availability and consider comparable replacement models.
What warranty comes with Resun Solar RS6C-P panels?
The manufacturer backs the RS6C-P series with a 12-year product warranty and a 30-year linear power warranty. This means the output degradation of the 156x156 mm poly cells is contractually limited over that entire period, giving investors a predictable and stable energy yield from the 270 Wp module across three decades of operation.
What do the five busbars in the RS6C-P panel provide, and is this better than standard 3BB?
Five busbars (5BB) conduct current from the cell more efficiently than older 3BB layouts, reducing resistive losses and improving module efficiency. The shorter path electrons travel to the metallization grid lowers the impact of micro-cracks on output, making the RS6C-P more stable even with minor cell-level mechanical damage.
Is the RS6C-P panel suitable for harsh environments such as coastal installations?
Yes, the RS6C-P was engineered for demanding locations - coastal areas, desert regions, and sites near bodies of water. The module offers high resistance to wind and snow loads, and its anti-reflective, hydrophobic coating reduces soiling buildup, which matters under heavy moisture and salt exposure.
What does the PID-free certification on the RS6C-P mean and why does it matter?
PID-free means the RS6C-P panel resists potential-induced degradation, a phenomenon where voltage differences between cells and the grounded frame cause power loss. This certification helps the module maintain stable performance throughout its lifetime, even in large grid-tied arrays with high string voltages.
Is the RS6C-P a bifacial panel, and how does that affect its use?
No, the RS6C-P series is a monofacial panel built on classic polycrystalline cells. It generates energy only from light hitting its front surface, making it best suited for standard rooftop and ground-mount installations that don't rely on reflected light from the ground surface.
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