Suntech STP730S-D66-Nsh+ vs Suntech STP635S-H66-Nsh+
VS
The verdict
6 differences, and they point both ways
The largest is rated power: 95 W more power. 13 of 19 comparable parameters are identical.
See all 6 differencesHow alike are they
13
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
6 of 19 parameters
What actually differs
Parameter
STP730S-D66-Nsh+
STP635S-H66-Nsh+
Difference
Rated power
730 Wp
635 Wp
95 W more power
Weight
37.5 kg
33.1 kg
4.4 kg lighter
Short-circuit current
18.54 A
16.08 A
2.46 A apart
Module area
3.106 m²
2.701 m²
0.405 m² apart
Current at max power
17.70 A
15.31 A
2.39 A apart
Dimensions
2384x1303x33 mm
2382x1134x30 mm
2384x1303x33 mm vs 2382x1134x30 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.
STP730S-D66-Nsh+
24,493 kWh
STP635S-H66-Nsh+
21,306 kWh
Lifetime gap
3,187 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
STP730S-D66-Nsh+
STP635S-H66-Nsh+
Standard test conditions
25 °C
100.0% of rated power
730 W
635 W
Cool, bright day
40 °C
95.8% of rated power
699 W
608 W
Typical summer roof
55 °C
91.6% of rated power
669 W
582 W
Hot roof
70 °C
87.4% of rated power
638 W
555 W
03
Full specification
Parameter
STP730S-D66-Nsh+
STP635S-H66-Nsh+
Difference
Power and efficiency
Rated power
730 Wp
635 Wp
+95 W for STP730S-D66-Nsh+
Module efficiency
23.50 %
23.50 %
Same
Power density
235.0 Wp/m²
235.1 Wp/m²
Effectively the same
Open-circuit voltage
49.66 V
49.50 V
Effectively the same
Voltage at max power
41.27 V
41.50 V
Effectively the same
Short-circuit current
18.54 A
16.08 A
2.46 A apart
Current at max power
17.70 A
15.31 A
2.39 A apart
Temperature
Temperature coefficient
-0.280 %/°C
-0.280 %/°C
Same
Mechanical
Dimensions
2384x1303x33 mm
2382x1134x30 mm
2384x1303x33 mm vs 2382x1134x30 mm
Module area
3.106 m²
2.701 m²
0.405 m² apart
Weight
37.5 kg
33.1 kg
-4.4 kg for STP635S-H66-Nsh+
Weight per kWp
51.4 kg/kWp
52.1 kg/kWp
Effectively the same
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
#716
vs
#716
Tied - the same position in the database
Power density
#800
vs
#741
STP635S-H66-Nsh+ leads by 59 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#4,748
vs
#5,600
STP730S-D66-Nsh+ leads by 852 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#196
vs
#1,462
STP730S-D66-Nsh+ leads by 1,266 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 STP730S-D66-Nsh+ or Suntech STP635S-H66-Nsh+?
According to our database: both panels are closely matched on key specs - the decision often comes down to price and local availability. See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Suntech STP730S-D66-Nsh+ and Suntech STP635S-H66-Nsh+?
Suntech STP730S-D66-Nsh+ has a module efficiency of 23.50%, while Suntech STP635S-H66-Nsh+ is 23.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Suntech STP730S-D66-Nsh+ use vs Suntech STP635S-H66-Nsh+?
Suntech STP730S-D66-Nsh+ uses TOPCon cells; Suntech STP635S-H66-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 STP730S-D66-Nsh+ and Suntech STP635S-H66-Nsh+?
Suntech STP730S-D66-Nsh+ has a 30 years power warranty; Suntech STP635S-H66-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 STP730S-D66-Nsh+ and Suntech STP635S-H66-Nsh+ bifacial panels?
Both Suntech STP730S-D66-Nsh+ and Suntech STP635S-H66-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.