Suntech STP-NT11/66QGDF-645 vs Suntech STP730S-D66-Nsh+
VS
The verdict
STP-NT11/66QGDF-645 leads on the differences that matter
The largest is rated power: 85 W more power. 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-645
STP730S-D66-Nsh+
Difference
Rated power
645 Wp
730 Wp
85 W more power
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 efficiency
23.90 %
23.50 %
0.40 pp more efficient
Short-circuit current
16.29 A
18.54 A
2.25 A apart
Module area
2.701 m²
3.106 m²
0.405 m² apart
Power density
238.8 Wp/m²
235.0 Wp/m²
3.8 Wp/m² higher
Annual degradation
0.35 %/yr
0.40 %/yr
0.05 %/yr slower
Current at max power
15.50 A
17.70 A
2.20 A apart
Cell count
264
132
132 cells 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-645
21,809 kWh
STP730S-D66-Nsh+
24,493 kWh
Lifetime gap
2,684 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
STP-NT11/66QGDF-645
STP730S-D66-Nsh+
Standard test conditions
25 °C
100.0% of rated power
645 W
730 W
Cool, bright day
40 °C
95.8% of rated power
620 W
699 W
Typical summer roof
55 °C
91.6% of rated power
595 W
669 W
Hot roof
70 °C
87.4% of rated power
570 W
638 W
03
Full specification
Parameter
STP-NT11/66QGDF-645
STP730S-D66-Nsh+
Difference
Power and efficiency
Rated power
645 Wp
730 Wp
+85 W for STP730S-D66-Nsh+
Module efficiency
23.90 %
23.50 %
+0.40 pp for STP-NT11/66QGDF-645
Power density
238.8 Wp/m²
235.0 Wp/m²
+3.8 Wp/m² for STP-NT11/66QGDF-645
Open-circuit voltage
49.85 V
49.66 V
Effectively the same
Voltage at max power
41.62 V
41.27 V
Effectively the same
Short-circuit current
16.29 A
18.54 A
2.25 A apart
Current at max power
15.50 A
17.70 A
2.20 A apart
Temperature
Temperature coefficient
-0.260 %/°C
-0.280 %/°C
+0.020 %/°C for STP-NT11/66QGDF-645
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-645
Weight per kWp
51.3 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-645
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
#351
vs
#716
STP-NT11/66QGDF-645 leads by 365 places
Power density
#356
vs
#800
STP-NT11/66QGDF-645 leads by 444 places
Heat behaviour
#511
vs
#1,309
STP-NT11/66QGDF-645 leads by 798 places
Weight
#4,693
vs
#4,748
STP-NT11/66QGDF-645 leads by 55 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,084
vs
#196
STP730S-D66-Nsh+ leads by 888 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 STP-NT11/66QGDF-645 or Suntech STP730S-D66-Nsh+?
According to our database: Suntech STP-NT11/66QGDF-645 has higher module efficiency (23.90% vs 23.50%); Suntech STP-NT11/66QGDF-645 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-645 and Suntech STP730S-D66-Nsh+?
Suntech STP-NT11/66QGDF-645 has a module efficiency of 23.90%, 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-645 use vs Suntech STP730S-D66-Nsh+?
Suntech STP-NT11/66QGDF-645 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-645 and Suntech STP730S-D66-Nsh+?
Suntech STP-NT11/66QGDF-645 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-645 and Suntech STP730S-D66-Nsh+ bifacial panels?
Both Suntech STP-NT11/66QGDF-645 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.