Suntech STP-NT11/48QGDF-475 vs Suntech STP-NT11/66QGDF-655
VS
The verdict
11 differences, and they point both ways
The largest is rated power: 180 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
48QGDF-475
66QGDF-655
Difference
Rated power
475 Wp
655 Wp
180 W more power
Weight
21.5 kg
33.1 kg
11.6 kg lighter
Product warranty
25 yrs
15 yrs
10 yrs longer
Module efficiency
23.80 %
24.20 %
0.40 pp more efficient
Open-circuit voltage
36.53 V
50.15 V
13.62 V apart
Module area
1.998 m²
2.701 m²
0.703 m² apart
Weight per kWp
45.3 kg/kWp
50.5 kg/kWp
5.3 kg/kWp lighter
Power density
237.7 Wp/m²
242.5 Wp/m²
4.8 Wp/m² higher
Voltage at max power
30.43 V
41.91 V
11.48 V apart
Cell count
192
264
72 cells apart
Dimensions
1762x1134x30 mm
2382x1134x30 mm
1762x1134x30 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 (-0.260 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
48QGDF-475
16,061 kWh
66QGDF-655
22,148 kWh
Lifetime gap
6,087 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
48QGDF-475
66QGDF-655
Standard test conditions
25 °C
100.0% of rated power
475 W
655 W
Cool, bright day
40 °C
96.1% of rated power
456 W
629 W
Typical summer roof
55 °C
92.2% of rated power
438 W
604 W
Hot roof
70 °C
88.3% of rated power
419 W
578 W
03
Full specification
Parameter
48QGDF-475
66QGDF-655
Difference
Power and efficiency
Rated power
475 Wp
655 Wp
+180 W for 66QGDF-655
Module efficiency
23.80 %
24.20 %
+0.40 pp for 66QGDF-655
Power density
237.7 Wp/m²
242.5 Wp/m²
+4.8 Wp/m² for 66QGDF-655
Open-circuit voltage
36.53 V
50.15 V
13.62 V apart
Voltage at max power
30.43 V
41.91 V
11.48 V apart
Short-circuit current
16.43 A
16.43 A
Same
Current at max power
15.62 A
15.63 A
Effectively the same
Temperature
Temperature coefficient
-0.260 %/°C
-0.260 %/°C
Same
Mechanical
Dimensions
1762x1134x30 mm
2382x1134x30 mm
1762x1134x30 mm vs 2382x1134x30 mm
Module area
1.998 m²
2.701 m²
0.703 m² apart
Weight
21.5 kg
33.1 kg
-11.6 kg for 48QGDF-475
Weight per kWp
45.3 kg/kWp
50.5 kg/kWp
-5.3 kg/kWp for 48QGDF-475
Warranty and degradation
Product warranty
25 yrs
15 yrs
+10 yrs for 48QGDF-475
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.35 %/yr
0.35 %/yr
Same
Technology
Cell technology
TOPCon
TOPCon
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
192
264
72 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#433
vs
#184
66QGDF-655 leads by 249 places
Power density
#467
vs
#172
66QGDF-655 leads by 295 places
Heat behaviour
#511
vs
#511
Tied - the same position in the database
Weight
#669
vs
#3,911
48QGDF-475 leads by 3,242 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#3,753
vs
#747
66QGDF-655 leads by 3,006 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-NT11/48QGDF-475 or Suntech STP-NT11/66QGDF-655?
According to our database: Suntech STP-NT11/66QGDF-655 has higher module efficiency (24.20% vs 23.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Suntech STP-NT11/48QGDF-475 and Suntech STP-NT11/66QGDF-655?
Suntech STP-NT11/48QGDF-475 has a module efficiency of 23.80%, while Suntech STP-NT11/66QGDF-655 is 24.20%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Suntech STP-NT11/48QGDF-475 use vs Suntech STP-NT11/66QGDF-655?
Suntech STP-NT11/48QGDF-475 uses TOPCon cells; Suntech STP-NT11/66QGDF-655 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-NT11/48QGDF-475 and Suntech STP-NT11/66QGDF-655?
Suntech STP-NT11/48QGDF-475 has a 30 years power warranty; Suntech STP-NT11/66QGDF-655 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-NT11/48QGDF-475 and Suntech STP-NT11/66QGDF-655 bifacial panels?
Both Suntech STP-NT11/48QGDF-475 and Suntech STP-NT11/66QGDF-655 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.