Suntech STP705S-D66-Nsh+ vs Suntech STP635S-H66-Nsh+
VS
The verdict
STP635S-H66-Nsh+ leads on the differences that matter
The largest is module efficiency: 0.80 pp more efficient. 7 of 19 comparable parameters are identical.
See all 12 differencesHow alike are they
7
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
12 of 19 parameters
What actually differs
Parameter
STP705S-D66-Nsh+
STP635S-H66-Nsh+
Difference
Module efficiency
22.70 %
23.50 %
0.80 pp more efficient
Rated power
705 Wp
635 Wp
70 W more power
Weight
38.5 kg
33.1 kg
5.4 kg lighter
Power density
227.0 Wp/m²
235.1 Wp/m²
8.1 Wp/m² higher
Product warranty
12 yrs
15 yrs
3 yrs longer
Short-circuit current
18.43 A
16.08 A
2.35 A apart
Module area
3.106 m²
2.701 m²
0.405 m² apart
Temperature coefficient
-0.290 %/°C
-0.280 %/°C
0.010 %/°C better in heat
Current at max power
17.49 A
15.31 A
2.18 A apart
Weight per kWp
54.6 kg/kWp
52.1 kg/kWp
2.5 kg/kWp lighter
Dimensions
2384x1303x33 mm
2382x1134x30 mm
2384x1303x33 mm vs 2382x1134x30 mm
Voltage at max power
40.31 V
41.50 V
1.19 V apart
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
STP705S-D66-Nsh+
23,654 kWh
STP635S-H66-Nsh+
21,306 kWh
Lifetime gap
2,348 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
STP705S-D66-Nsh+
STP635S-H66-Nsh+
Standard test conditions
25 °C
100.0% of rated power
705 W
635 W
Cool, bright day
40 °C
95.7% of rated power
674 W
608 W
Typical summer roof
55 °C
91.3% of rated power
644 W
582 W
Hot roof
70 °C
87.0% of rated power
613 W
555 W
03
Full specification
Parameter
STP705S-D66-Nsh+
STP635S-H66-Nsh+
Difference
Power and efficiency
Rated power
705 Wp
635 Wp
+70 W for STP705S-D66-Nsh+
Module efficiency
22.70 %
23.50 %
+0.80 pp for STP635S-H66-Nsh+
Power density
227.0 Wp/m²
235.1 Wp/m²
+8.1 Wp/m² for STP635S-H66-Nsh+
Open-circuit voltage
48.57 V
49.50 V
Effectively the same
Voltage at max power
40.31 V
41.50 V
1.19 V apart
Short-circuit current
18.43 A
16.08 A
2.35 A apart
Current at max power
17.49 A
15.31 A
2.18 A apart
Temperature
Temperature coefficient
-0.290 %/°C
-0.280 %/°C
+0.010 %/°C for STP635S-H66-Nsh+
Mechanical
Dimensions
2384x1303x33 mm
2382x1134x30 mm
2384x1303x33 mm vs 2382x1134x30 mm
Module area
3.106 m²
2.701 m²
0.405 m² apart
Weight
38.5 kg
33.1 kg
-5.4 kg for STP635S-H66-Nsh+
Weight per kWp
54.6 kg/kWp
52.1 kg/kWp
-2.5 kg/kWp for STP635S-H66-Nsh+
Warranty and degradation
Product warranty
12 yrs
15 yrs
+3 yrs for STP635S-H66-Nsh+
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
#3,307
vs
#716
STP635S-H66-Nsh+ leads by 2,591 places
Power density
#3,361
vs
#741
STP635S-H66-Nsh+ leads by 2,620 places
Heat behaviour
#2,165
vs
#1,309
STP635S-H66-Nsh+ leads by 856 places
Weight
#8,959
vs
#5,600
STP635S-H66-Nsh+ leads by 3,359 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,037
vs
#1,462
STP705S-D66-Nsh+ leads by 425 places
05
Open the full database
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The same specification on paper
06
Written summary
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07
Questions about this pairing
Which panel is better: Suntech STP705S-D66-Nsh+ or Suntech STP635S-H66-Nsh+?
According to our database: Suntech STP635S-H66-Nsh+ has higher module efficiency (23.50% vs 22.70%); Suntech STP635S-H66-Nsh+ tolerates heat better (temp coeff -0.280%/°C vs -0.290%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Suntech STP705S-D66-Nsh+ and Suntech STP635S-H66-Nsh+?
Suntech STP705S-D66-Nsh+ has a module efficiency of 22.70%, 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 STP705S-D66-Nsh+ use vs Suntech STP635S-H66-Nsh+?
Suntech STP705S-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 STP705S-D66-Nsh+ and Suntech STP635S-H66-Nsh+?
Suntech STP705S-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 STP705S-D66-Nsh+ and Suntech STP635S-H66-Nsh+ bifacial panels?
Both Suntech STP705S-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.