Suntech STP615S-H66-Nsh+ vs Suntech STP735S-D66-Nsh+
VS
The verdict
STP735S-D66-Nsh+ leads on the differences that matter
The largest is module efficiency: 0.90 pp more efficient. 9 of 19 comparable parameters are identical.
See all 10 differencesHow alike are they
9
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
10 of 19 parameters
What actually differs
Parameter
STP615S-H66-Nsh+
STP735S-D66-Nsh+
Difference
Module efficiency
22.80 %
23.70 %
0.90 pp more efficient
Rated power
615 Wp
735 Wp
120 W more power
Weight
33.1 kg
37.5 kg
4.4 kg lighter
Power density
227.7 Wp/m²
236.6 Wp/m²
8.9 Wp/m² higher
Short-circuit current
15.92 A
18.58 A
2.66 A apart
Module area
2.701 m²
3.106 m²
0.405 m² apart
Weight per kWp
53.8 kg/kWp
51.0 kg/kWp
2.8 kg/kWp lighter
Current at max power
15.12 A
17.74 A
2.62 A apart
Open-circuit voltage
48.70 V
49.86 V
1.16 V apart
Dimensions
2382x1134x30 mm
2384x1303x33 mm
2382x1134x30 mm vs 2384x1303x33 mm
02
What it means on a roof
Thirty years of production
Each panel's own declared degradation curve, at 1,200 kWh/kWp a year
Same temp coeff. for both panels (-0.280 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
STP615S-H66-Nsh+
20,634 kWh
STP735S-D66-Nsh+
24,661 kWh
Lifetime gap
4,027 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
STP615S-H66-Nsh+
STP735S-D66-Nsh+
Standard test conditions
25 °C
100.0% of rated power
615 W
735 W
Cool, bright day
40 °C
95.8% of rated power
589 W
704 W
Typical summer roof
55 °C
91.6% of rated power
563 W
673 W
Hot roof
70 °C
87.4% of rated power
538 W
642 W
03
Full specification
Parameter
STP615S-H66-Nsh+
STP735S-D66-Nsh+
Difference
Power and efficiency
Rated power
615 Wp
735 Wp
+120 W for STP735S-D66-Nsh+
Module efficiency
22.80 %
23.70 %
+0.90 pp for STP735S-D66-Nsh+
Power density
227.7 Wp/m²
236.6 Wp/m²
+8.9 Wp/m² for STP735S-D66-Nsh+
Open-circuit voltage
48.70 V
49.86 V
1.16 V apart
Voltage at max power
40.70 V
41.47 V
Effectively the same
Short-circuit current
15.92 A
18.58 A
2.66 A apart
Current at max power
15.12 A
17.74 A
2.62 A apart
Temperature
Temperature coefficient
-0.280 %/°C
-0.280 %/°C
Same
Mechanical
Dimensions
2382x1134x30 mm
2384x1303x33 mm
2382x1134x30 mm vs 2384x1303x33 mm
Module area
2.701 m²
3.106 m²
0.405 m² apart
Weight
33.1 kg
37.5 kg
-4.4 kg for STP615S-H66-Nsh+
Weight per kWp
53.8 kg/kWp
51.0 kg/kWp
-2.8 kg/kWp for STP735S-D66-Nsh+
Warranty and degradation
Product warranty
15 yrs
15 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.40 %/yr
0.40 %/yr
Same
Technology
Cell technology
TOPCon
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
132
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#2,714
vs
#517
STP735S-D66-Nsh+ leads by 2,197 places
Power density
#3,077
vs
#582
STP735S-D66-Nsh+ leads by 2,495 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#7,888
vs
#4,360
STP735S-D66-Nsh+ leads by 3,528 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#2,350
vs
#155
STP735S-D66-Nsh+ leads by 2,195 places
05
Open the full database
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06
Written summary
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07
Questions about this pairing
Which panel is better: Suntech STP615S-H66-Nsh+ or Suntech STP735S-D66-Nsh+?
According to our database: Suntech STP735S-D66-Nsh+ has higher module efficiency (23.70% vs 22.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Suntech STP615S-H66-Nsh+ and Suntech STP735S-D66-Nsh+?
Suntech STP615S-H66-Nsh+ has a module efficiency of 22.80%, while Suntech STP735S-D66-Nsh+ is 23.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Suntech STP615S-H66-Nsh+ use vs Suntech STP735S-D66-Nsh+?
Suntech STP615S-H66-Nsh+ uses TOPCon cells; Suntech STP735S-D66-Nsh+ uses TOPCon. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.
What is the warranty on Suntech STP615S-H66-Nsh+ and Suntech STP735S-D66-Nsh+?
Suntech STP615S-H66-Nsh+ has a 30 years power warranty; Suntech STP735S-D66-Nsh+ has a 30 years power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80-87%). Product (materials) warranties are usually shorter.
Are Suntech STP615S-H66-Nsh+ and Suntech STP735S-D66-Nsh+ bifacial panels?
Both Suntech STP615S-H66-Nsh+ and Suntech STP735S-D66-Nsh+ are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.
Shop prices: See 30 Suntech offers
Every figure here is from the manufacturers' own datasheets - a dash means the value is not published, never an estimate. The thirty-year projection and the temperature scenarios are calculations from those figures, and each states its assumption above.