Suntech STP725S-D66-Nsh+ vs Suntech STP635S-H66-Nsh+
VS
The verdict
7 differences, and they point both ways
The largest is rated power: 90 W more power. 12 of 19 comparable parameters are identical.
See all 7 differencesHow alike are they
12
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
7 of 19 parameters
What actually differs
Parameter
STP725S-D66-Nsh+
STP635S-H66-Nsh+
Difference
Rated power
725 Wp
635 Wp
90 W more power
Weight
37.5 kg
33.1 kg
4.4 kg lighter
Short-circuit current
18.50 A
16.08 A
2.42 A apart
Module area
3.106 m²
2.701 m²
0.405 m² apart
Module efficiency
23.30 %
23.50 %
0.20 pp more efficient
Current at max power
17.66 A
15.31 A
2.35 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.
STP725S-D66-Nsh+
24,325 kWh
STP635S-H66-Nsh+
21,306 kWh
Lifetime gap
3,019 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
STP725S-D66-Nsh+
STP635S-H66-Nsh+
Standard test conditions
25 °C
100.0% of rated power
725 W
635 W
Cool, bright day
40 °C
95.8% of rated power
695 W
608 W
Typical summer roof
55 °C
91.6% of rated power
664 W
582 W
Hot roof
70 °C
87.4% of rated power
634 W
555 W
03
Full specification
Parameter
STP725S-D66-Nsh+
STP635S-H66-Nsh+
Difference
Power and efficiency
Rated power
725 Wp
635 Wp
+90 W for STP725S-D66-Nsh+
Module efficiency
23.30 %
23.50 %
+0.20 pp for STP635S-H66-Nsh+
Power density
233.4 Wp/m²
235.1 Wp/m²
Effectively the same
Open-circuit voltage
49.46 V
49.50 V
Effectively the same
Voltage at max power
41.07 V
41.50 V
Effectively the same
Short-circuit current
18.50 A
16.08 A
2.42 A apart
Current at max power
17.66 A
15.31 A
2.35 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
51.7 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
#1,017
vs
#716
STP635S-H66-Nsh+ leads by 301 places
Power density
#936
vs
#741
STP635S-H66-Nsh+ leads by 195 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#5,085
vs
#5,600
STP725S-D66-Nsh+ leads by 515 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#263
vs
#1,462
STP725S-D66-Nsh+ leads by 1,199 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 STP725S-D66-Nsh+ or Suntech STP635S-H66-Nsh+?
According to our database: Suntech STP635S-H66-Nsh+ has higher module efficiency (23.50% vs 23.30%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Suntech STP725S-D66-Nsh+ and Suntech STP635S-H66-Nsh+?
Suntech STP725S-D66-Nsh+ has a module efficiency of 23.30%, 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 STP725S-D66-Nsh+ use vs Suntech STP635S-H66-Nsh+?
Suntech STP725S-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 STP725S-D66-Nsh+ and Suntech STP635S-H66-Nsh+?
Suntech STP725S-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 STP725S-D66-Nsh+ and Suntech STP635S-H66-Nsh+ bifacial panels?
Both Suntech STP725S-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 29 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.