Suntech STP-NT11/66QGDF-665 vs Suntech STP730S-D66-Nsh+
VS
The verdict
STP-NT11/66QGDF-665 leads on the differences that matter
The largest is module efficiency: 1.10 pp more efficient. 8 of 19 comparable parameters are identical.
See all 11 differencesHow alike are they
8
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
11 of 19 parameters
What actually differs
Parameter
STP-NT11/66QGDF-665
STP730S-D66-Nsh+
Difference
Module efficiency
24.60 %
23.50 %
1.10 pp more efficient
Rated power
665 Wp
730 Wp
65 W more power
Power density
246.2 Wp/m²
235.0 Wp/m²
11.2 Wp/m² higher
Weight
33.1 kg
37.5 kg
4.4 kg lighter
Temperature coefficient
-0.260 %/°C
-0.280 %/°C
0.020 %/°C better in heat
Module area
2.701 m²
3.106 m²
0.405 m² apart
Short-circuit current
16.57 A
18.54 A
1.97 A apart
Annual degradation
0.35 %/yr
0.40 %/yr
0.05 %/yr slower
Cell count
264
132
132 cells apart
Current at max power
15.76 A
17.70 A
1.94 A 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
STP-NT11/66QGDF-665
22,486 kWh
STP730S-D66-Nsh+
24,493 kWh
Lifetime gap
2,007 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
STP-NT11/66QGDF-665
STP730S-D66-Nsh+
Standard test conditions
25 °C
100.0% of rated power
665 W
730 W
Cool, bright day
40 °C
95.8% of rated power
639 W
699 W
Typical summer roof
55 °C
91.6% of rated power
613 W
669 W
Hot roof
70 °C
87.4% of rated power
587 W
638 W
03
Full specification
Parameter
STP-NT11/66QGDF-665
STP730S-D66-Nsh+
Difference
Power and efficiency
Rated power
665 Wp
730 Wp
+65 W for STP730S-D66-Nsh+
Module efficiency
24.60 %
23.50 %
+1.10 pp for STP-NT11/66QGDF-665
Power density
246.2 Wp/m²
235.0 Wp/m²
+11.2 Wp/m² for STP-NT11/66QGDF-665
Open-circuit voltage
50.45 V
49.66 V
Effectively the same
Voltage at max power
42.21 V
41.27 V
Effectively the same
Short-circuit current
16.57 A
18.54 A
1.97 A apart
Current at max power
15.76 A
17.70 A
1.94 A apart
Temperature
Temperature coefficient
-0.260 %/°C
-0.280 %/°C
+0.020 %/°C for STP-NT11/66QGDF-665
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 STP-NT11/66QGDF-665
Weight per kWp
49.8 kg/kWp
51.4 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
15 yrs
15 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.35 %/yr
0.40 %/yr
-0.05 %/yr for STP-NT11/66QGDF-665
Technology
Cell technology
TOPCon
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
264
132
132 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#51
vs
#716
STP-NT11/66QGDF-665 leads by 665 places
Power density
#42
vs
#800
STP-NT11/66QGDF-665 leads by 758 places
Heat behaviour
#511
vs
#1,309
STP-NT11/66QGDF-665 leads by 798 places
Weight
#3,223
vs
#4,748
STP-NT11/66QGDF-665 leads by 1,525 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#414
vs
#196
STP730S-D66-Nsh+ leads by 218 places
05
Open the full database
More useful comparisons
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Suntech STP-NT11/66QGDF-665 vs Suntech STP-NT11/66QGDF-655
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Suntech STP-NT11/66QGDF-665 vs Suntech STP-NT11/66QGDF-640
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06
Written summary
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07
Questions about this pairing
Which panel is better: Suntech STP-NT11/66QGDF-665 or Suntech STP730S-D66-Nsh+?
According to our database: Suntech STP-NT11/66QGDF-665 has higher module efficiency (24.60% vs 23.50%); Suntech STP-NT11/66QGDF-665 tolerates heat better (temp coeff -0.260%/°C vs -0.280%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Suntech STP-NT11/66QGDF-665 and Suntech STP730S-D66-Nsh+?
Suntech STP-NT11/66QGDF-665 has a module efficiency of 24.60%, while Suntech STP730S-D66-Nsh+ is 23.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Suntech STP-NT11/66QGDF-665 use vs Suntech STP730S-D66-Nsh+?
Suntech STP-NT11/66QGDF-665 uses TOPCon cells; Suntech STP730S-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 STP-NT11/66QGDF-665 and Suntech STP730S-D66-Nsh+?
Suntech STP-NT11/66QGDF-665 has a 30 years power warranty; Suntech STP730S-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 STP-NT11/66QGDF-665 and Suntech STP730S-D66-Nsh+ bifacial panels?
Both Suntech STP-NT11/66QGDF-665 and Suntech STP730S-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 31 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.