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Suntech Brand review

STP345S-A66/Ssh

345 Wp PERC
ComparePV verdict

Light for its output, weak in heat

Rank 12,935 of 14,129
Compare panels Datasheet PDF
Power (Wp)
345
Strong · top 4%
Efficiency (%)
19.70
Strong · top 21%
Density (Wp/m²)
196.7
Strong · top 20%
Temp (%/°C)
-0.380
Weak · bottom 23%
Weight (kg)
19.0
Strong · top 7%
Warranty (yrs)
25
Typical · median 25 yrs

The HiSpec 396 Half-Cell Monofacial series consists of monocrystalline PERC modules built from 396 half-cut cells, which reduces resistive losses and allows the module to better withstand partial shading without a drastic drop in string output. HD technology eliminates gaps between cells, increasing the active surface area of the panel, while a unique circuit design lowers electrode resistance and improves the fill factor. This makes it a solid choice for installers and investors looking for panels that combine high conversion efficiency with resilience in demanding operating conditions - the modules have passed extended wind and snow load testing, making them suitable for roofs exposed to extreme weather. The panels also stand out for their excellent weak-light performance, delivering real energy gains during mornings, evenings, and cloudy days, while a lower operating temperature limits power losses on hot days. The integrated IP68-rated junction box provides reliable moisture protection regardless of mounting orientation. Through current sorting during manufacturing, Suntech minimizes mismatch losses across the module string, translating into higher real-world energy yield compared to competing solutions in this class.

Ranking

291 panels in the segment PERC 300-350 W
Metric This panel Median Position in segment Overall rank
Module efficiency 19.70% 19.00% Strong · top 21% 12,596
Power density 196.7 190.0 Strong · top 20% 12,613
Temperature coefficient -0.380 -0.360 Weak · bottom 23% 13,477
Weight per kWp 55.1 60.3 Strong · top 7% 9,561
Performance warranty 25 yrs 25 yrs Typical 9,912
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

3 positive · 1 caution
Best for

Residential, commercial and shaded-installations.

Not ideal for

Hot climates.

Strengths
55.1 kg per kWp

Top 7% of the PERC 300-350 W segment, against a median of 60.3. Ranked 9,561st in the whole database.

196.7 watts per square metre

Top 20% of the PERC 300-350 W segment, against a median of 190.0.

19.70% module efficiency

Top 21% of the PERC 300-350 W segment, against a median of 19.00%.

Watch-outs
-0.380 %/°C temperature coefficient

Bottom 23% of the PERC 300-350 W segment, against a median of -0.360.

Notes from the database
  • At 19.7% efficiency, this panel is on par with typical PERC 0-400W modules
  • At 196.7 W/m² power density, roof space requirements are typical for PERC 0-400W panels
  • -0.38%/°C temperature coefficient - 0.02pp worse than PERC 0-400W median (-0.36%/°C), expect higher hot weather losses
  • At 19.0 kg, this panel is 1.5 kg lighter than PERC 0-400W median (20.5 kg) - easier handling during installation
  • In the top 89% for efficiency among all PERC panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 345 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 19.70 % Strong Segment median 19.00%
Vmpp · Impp 38.59 V · 8.94 A Operating point at max power
Voc · Isc 46.49 V · 9.53 A Sizes the string length
Max system voltage 1000 V Longer strings than 1000 V modules
Dimensions 1740×1008×35 mm · 1.75 m² of roof
Weight 19.0 kg Strong Strong · top 7%
Cells 396 · PERC Monocrystalline
Coefficient Pmax -0.380 %/°C Weak bottom 23% of its segment
Coefficient Voc · Isc -0.310 · 0.048 %/°C
NOCT 43 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 25 years Typical median 25 yrs · median 25 yrs
End-of-warranty output 80.2 % Equals 286 W guaranteed
Degradation 2.50 → 0.50 % 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
-0.380 %/°C against a segment median of -0.360
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Suntech STP345S-A66/Ssh 345 W 19.70% -0.380 19.0 kg You are here
NS-300MH-72 300 W 23.32% -0.290 12.5 kg Cooler, lighter, +3.6 pp
NS-300MH-72 300 W 23.32% -0.290 12.5 kg Cooler, lighter, +3.6 pp
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, lighter, +3.4 pp
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, lighter, +3.4 pp
GKA182M300W 300 W 23.00% - 16.2 kg -45 W, +3.3 pp, +5 yr warranty
GKA210M320W 320 W 23.00% - 16.2 kg Lighter, +3.3 pp, +5 yr warranty
GKA210M340W 340 W 23.00% - 16.2 kg Lighter, +3.3 pp, +5 yr warranty
GKA210M360W 360 W 23.00% - 16.2 kg Lighter, +3.3 pp, +5 yr warranty
GKA210M380W (1/4*4*38) 380 W 23.00% - 17.1 kg +35 W, +3.3 pp, +5 yr warranty
GKA210M380W (1/2*4*19) 380 W 23.00% - 17.1 kg +35 W, +3.3 pp, +5 yr warranty
STP350S-A66/Ssh 350 W 20.00% -0.380 19.0 kg +0.3 pp
STP355S-A66/Ssh 355 W 20.20% -0.380 19.0 kg +10 W, +0.5 pp
STP360S-A66/Ssh 360 W 20.50% -0.380 19.0 kg +15 W, +0.8 pp
STP365S-A66/Ssh 365 W 20.80% -0.380 19.0 kg +20 W, +1.1 pp
JT440SYK(B) 440 W 22.90% -0.240 23.0 kg +95 W, cooler, +3.2 pp
JT435SYk(B) 435 W 22.70% -0.240 23.0 kg +90 W, cooler, +3.0 pp

Found 5 panels of the same or similar size to this one, within ±10 mm. See them here Found 11 panels of the same or similar size to this one, within ±25 mm. See them here Found 362 panels of the same or similar size to this one, within ±50 mm. See them here Found 871 panels of the same or similar size to this one, within ±100 mm. See them here

About the HiSpec 396 Half-Cell Monofacial Module series

6 answered

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

What warranty comes with the Suntech HiSpec 396 Half-Cell Monofacial panels?
The manufacturer provides a 12-year product warranty and a 25-year linear power output warranty. The module reaches a maximum power of 365 Wp, and current-matched cell sorting minimizes mismatch losses within the module string, helping the array maintain its rated output over the system's lifetime.
What are half-cut cells in the HiSpec 396 and what benefit do they bring?
The module uses 396 half-cut monocrystalline PERC cells, meaning each cell is cut in half. This reduces resistive current losses, lowers electrode resistance, and helps the panel tolerate partial shading - from a chimney or antenna, for example - without a drastic drop in string output, resulting in higher real-world energy yield.
Is the Suntech HiSpec 396 Half-Cell Monofacial series still available for purchase?
No, production of this series has ended and the module is discontinued from the manufacturer's current lineup. Remaining units may still be available through distributors as clearance stock, but for new installations it's worth asking your supplier about the current equivalent model with an active service warranty going forward.
Can the HiSpec 396 panels handle heavy snow loads and strong wind?
Yes, HiSpec 396 modules have passed extended wind and snow load testing, making them suitable for roofs exposed to demanding weather conditions, including heavy snowfall and gusty winds. This is a key consideration when choosing panels for buildings in regions with variable, harsh climates.
How does the HiSpec 396 perform in low-light and hot weather conditions?
The panel offers strong low-irradiance performance, delivering real energy gains in the morning, evening, and on overcast days. It also runs at a lower operating temperature, which limits power losses during hot summer days, keeping the array's output more stable compared to modules with weaker temperature coefficients.
Is the junction box on the HiSpec 396 protected against moisture regardless of mounting angle?
Yes, the module features a sealed IP68-rated junction box that provides lasting protection against moisture and water ingress regardless of the panel's mounting orientation. This matters especially for flat-roof installations or sites prone to rainwater pooling near the connection point.
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