Skip to main content
S-Energy Brand review

SL65-66MAJ-505Z

505 Wp PERC
ComparePV verdict

Space saver, short guarantee

Rank 9,646 of 14,005
Compare panels Datasheet PDF
Power (Wp)
505
Weak · bottom 11%
Efficiency (%)
21.21
Strong · top 8%
Density (Wp/m²)
212.1
Strong · top 8%
Temp (%/°C)
-0.350
Typical · median -0.350
Weight (kg)
27.0
Typical · median 28.4 kg
Warranty (yrs)
25
Weak · bottom 23%

The S-Energy SL65-66MAJ series is designed for installations where stable performance under varying conditions - from full sun to partial shading - is crucial. The use of monocrystalline cells in a half-cut configuration minimizes losses due to heating and improves performance when the roof is intermittently shaded by chimneys, skylights, or trees. The modules utilize a 132-cell architecture, which translates to a better distribution of current loads and greater resistance to micro-cracks during transport and installation.

In practice, the SL65-66MAJ addresses a common problem for investors in Poland - decreased production in hot weather and uneven performance of strings under partial shading - thanks to its favorable temperature characteristics and well-thought-out electrical design. It is a good choice for single-family homes, businesses, and larger roofs where quick project completion and predictable performance over many years are important. An additional advantage is its conservative power tolerance and carefully considered safety features (including a sealed connection box), which facilitate long-term operation.

Ranking

706 panels in the segment PERC 500-550 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.21% 20.90% Strong · top 8% 9,075
Power density 212.1 209.0 Strong · top 8% 9,089
Temperature coefficient -0.350 -0.350 Typical 10,419
Weight per kWp 53.5 53.0 Typical 7,409
Performance warranty 25 yrs 30 yrs Weak · bottom 23% 9,798
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

2 positive · 1 caution
Best for

Residential, commercial and shaded-installations.

Not ideal for

Owners who want a long output guarantee.

Strengths
212.1 watts per square metre

Top 8% of the PERC 500-550 W segment, against a median of 209.0. Ranked 9,089th in the whole database.

21.21% module efficiency

Top 8% of the PERC 500-550 W segment, against a median of 20.90%. Ranked 9,075th in the whole database.

Watch-outs
25 year performance warranty

Bottom 23% of the PERC 500-550 W segment, against a median of 30 yrs.

Notes from the database
  • At 21.2% efficiency, this panel is on par with typical PERC 500-550W modules
  • Power density of 212.1 W/m² packs 3.1 W/m² more into the same footprint vs PERC 500-550W median (209.0 W/m²)
  • Temperature coefficient of -0.35%/°C matches the PERC 500-550W median
  • Weight of 27.0 kg (1.4 kg below PERC 500-550W median of 28.4 kg) allows easier transport and roof mounting
  • In the top 65% for efficiency among all PERC panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 505 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.21 % Strong Segment median 20.90%
Vmpp · Impp 38.30 V · 13.19 A Operating point at max power
Voc · Isc 45.90 V · 13.90 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2100×1134×35 mm · 2.38 m² of roof
Weight 27.0 kg Typical Typical · median 28.4 kg
Cells 66 · PERC Monocrystalline
Coefficient Pmax -0.350 %/°C Typical median -0.350 of its segment
Coefficient Voc · Isc -0.290 · 0.050 %/°C
NOCT 44 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 25 years Weak bottom 23% · median 30 yrs
End-of-warranty output 84.8 % Equals 414 W guaranteed
Degradation 2.00 → 0.55 % First year, then annual

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
-0.350 %/°C against a segment median of -0.350
-

Alternatives

All S-Energy panels
Filter these
Size
Panel Power Eff. Temp. Weight Difference
S-Energy SL65-66MAJ-505Z 505 W 21.21% -0.350 27.0 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg Cooler, +3.8 pp, +5 yr warranty
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg Cooler, lighter, +3.6 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg Cooler, +3.5 pp, +5 yr warranty
LR7-60HVH-555M 555 W 24.60% -0.260 25.0 kg +50 W, cooler, +3.4 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg Cooler, lighter, +3.3 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg Cooler, +3.3 pp, +5 yr warranty
SL65-66BDJ-480Z 480 W 20.21% -0.350 29.0 kg -25 W, -1.0 pp, +5 yr warranty
SL65-66MAJ-480Z 480 W 20.16% -0.350 27.0 kg -25 W, -1.1 pp
SL65-66BDJ-485Z 485 W 20.42% -0.350 29.0 kg -20 W, -0.8 pp, +5 yr warranty
SL65-66MAJ-485Z 485 W 20.37% -0.350 27.0 kg -20 W, -0.8 pp
SL65-66BAJ-490S 490 W 20.70% -0.350 26.5 kg -15 W, -0.5 pp
SL65-66BDJ-490Z 490 W 20.64% -0.350 29.0 kg Heavier, -0.6 pp, +5 yr warranty
SL65-66MAJ-490Z 490 W 20.58% -0.350 27.0 kg -15 W, -0.6 pp
SL65-66BAJ-495S 495 W 20.90% -0.350 26.5 kg -10 W, -0.3 pp
SL65-66BDJ-495Z 495 W 20.85% -0.350 29.0 kg Heavier, -0.4 pp, +5 yr warranty
SL65-66MAJ-495Z 495 W 20.79% -0.350 27.0 kg -10 W, -0.4 pp
GKA120N-PRO-590W 590 W 23.82% -0.300 26.7 kg +85 W, +2.6 pp, +5 yr warranty

Found 394 panels of the same or similar size to this one, within ±10 mm. See them here Found 402 panels of the same or similar size to this one, within ±25 mm. See them here Found 430 panels of the same or similar size to this one, within ±50 mm. See them here Found 885 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranty does the S-Energy SL65-66MAJ series come with?
The SL65-66MAJ series carries a 12-year product warranty covering material and workmanship defects. S-Energy also provides a 25-year linear power output warranty, guaranteeing that modules retain at least 80% of their rated power after that period. This is standard coverage for panels in this category. Before signing a contract, verify that the local distributor offers after-sales support in your country.
Does the half-cut PERC technology in the SL65-66MAJ actually improve performance under shading?
Yes. Half-cut cells are split in half, so a shadow covering part of the module blocks a smaller share of its output than in conventional full-cell panels. The 132-cell layout in the SL65-66MAJ limits losses from shading caused by chimneys, dormers, or trees, resulting in measurably higher annual energy yield, especially on roofs with complex geometry.
How do the S-Energy SL65-66MAJ panels perform in hot weather?
The power temperature coefficient is approximately -0.35%/°C, meaning the modules lose slightly less output during extreme heat compared to older full-cell designs. This favorable temperature characteristic translates into better production on summer afternoons in Central Europe, when module surface temperatures can exceed 65°C.
How many S-Energy SL65-66MAJ panels are needed for a 10 kWp system?
At 505 Wp per module, a 10 kWp system requires approximately 20 panels. For a typical single-family home consuming 4-6 MWh per year, 10-14 modules (5-7 kWp) are usually sufficient. The exact count is determined by a designer after analyzing actual electricity consumption and available roof area.
Who manufactures S-Energy panels and are they a reputable brand?
S-Energy is a South Korean solar panel manufacturer founded in 2001, originating from Samsung's photovoltaic division, with its own production facilities in South Korea. According to available data, the company is not currently listed as a Bloomberg NEF Tier 1 manufacturer, though its modules meet IEC standards and have been present on European markets for years. Confirm warranty support terms with the local distributor before purchasing.
Are the SL65-66MAJ modules compatible with popular inverters available on the market?
Yes. The SL65-66MAJ series meets electrical standards enabling compatibility with inverters from leading brands such as SMA, Fronius, Huawei, and Growatt, supporting system voltages up to 1000 or 1500 V DC. Before purchasing, have your installer verify that the inverter's MPPT input ranges match the current and voltage parameters of this series.
Add to compare