Suntech STP-NT11/48QGSF-475 vs Suntech STP-NT11/66QGDF-670
VS
The verdict
66QGDF-670 leads on the differences that matter
The largest is module efficiency: 1.00 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
48QGSF-475
66QGDF-670
Difference
Module efficiency
23.80 %
24.80 %
1.00 pp more efficient
Rated power
475 Wp
670 Wp
195 W more power
Power density
237.7 Wp/m²
248.0 Wp/m²
10.3 Wp/m² higher
Weight
21.5 kg
33.1 kg
11.6 kg lighter
Product warranty
25 yrs
15 yrs
10 yrs longer
Open-circuit voltage
36.53 V
50.60 V
14.07 V apart
Module area
1.998 m²
2.701 m²
0.703 m² apart
Weight per kWp
45.3 kg/kWp
49.4 kg/kWp
4.1 kg/kWp lighter
Voltage at max power
30.43 V
42.34 V
11.91 V apart
Cell count
192
264
72 cells apart
Bifacial
No
Yes
No vs Yes
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.
48QGSF-475
16,061 kWh
66QGDF-670
22,655 kWh
Lifetime gap
6,594 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
48QGSF-475
66QGDF-670
Standard test conditions
25 °C
100.0% of rated power
475 W
670 W
Cool, bright day
40 °C
96.1% of rated power
456 W
644 W
Typical summer roof
55 °C
92.2% of rated power
438 W
618 W
Hot roof
70 °C
88.3% of rated power
419 W
592 W
03
Full specification
Parameter
48QGSF-475
66QGDF-670
Difference
Power and efficiency
Rated power
475 Wp
670 Wp
+195 W for 66QGDF-670
Module efficiency
23.80 %
24.80 %
+1.00 pp for 66QGDF-670
Power density
237.7 Wp/m²
248.0 Wp/m²
+10.3 Wp/m² for 66QGDF-670
Open-circuit voltage
36.53 V
50.60 V
14.07 V apart
Voltage at max power
30.43 V
42.34 V
11.91 V apart
Short-circuit current
16.43 A
16.64 A
Effectively the same
Current at max power
15.62 A
15.84 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 48QGSF-475
Weight per kWp
45.3 kg/kWp
49.4 kg/kWp
-4.1 kg/kWp for 48QGSF-475
Warranty and degradation
Product warranty
25 yrs
15 yrs
+10 yrs for 48QGSF-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
No
Yes
No vs Yes
04
14,129 panels
Against the whole database
Efficiency
#462
vs
#13
66QGDF-670 leads by 449 places
Power density
#497
vs
#15
66QGDF-670 leads by 482 places
Heat behaviour
#515
vs
#515
Tied - the same position in the database
Weight
#669
vs
#2,914
48QGSF-475 leads by 2,245 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#3,803
vs
#305
66QGDF-670 leads by 3,498 places
05
Open the full database
More useful comparisons
Same series, other bin
Suntech STP-NT11/48QGSF-475 vs Suntech STP730S-D66-Nsh+
15 differences, the largest is rated power
Same series, other bin
Suntech STP-NT11/48QGSF-475 vs Suntech STP-NT11/66QGDF-665
12 differences, the largest is module efficiency
Same series, other bin
Suntech STP-NT11/48QGSF-475 vs Suntech STP-NT11/66QGDF-660
12 differences, the largest is rated power
Same series, other bin
Suntech STP-NT11/48QGSF-475 vs Suntech STP-NT11/66QGDF-655
12 differences, the largest is rated power
Same series, other bin
Suntech STP-NT11/48QGSF-475 vs Suntech STP-NT11/66QGDF-650
11 differences, the largest is rated power
Same series, other bin
Suntech STP-NT11/48QGSF-475 vs Suntech STP-NT11/66QGDF-645
10 differences, the largest is rated power
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: Suntech STP-NT11/48QGSF-475 or Suntech STP-NT11/66QGDF-670?
According to our database: Suntech STP-NT11/66QGDF-670 has higher module efficiency (24.80% 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-NT11/48QGSF-475 and Suntech STP-NT11/66QGDF-670?
Suntech STP-NT11/48QGSF-475 has a module efficiency of 23.80%, while Suntech STP-NT11/66QGDF-670 is 24.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Suntech STP-NT11/48QGSF-475 use vs Suntech STP-NT11/66QGDF-670?
Suntech STP-NT11/48QGSF-475 uses TOPCon cells; Suntech STP-NT11/66QGDF-670 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-NT11/48QGSF-475 and Suntech STP-NT11/66QGDF-670?
Suntech STP-NT11/48QGSF-475 has a 30 years power warranty; Suntech STP-NT11/66QGDF-670 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-NT11/48QGSF-475 and Suntech STP-NT11/66QGDF-670 bifacial panels?
Suntech STP-NT11/66QGDF-670 is bifacial (captures light from both faces); Suntech STP-NT11/48QGSF-475 is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
Shop prices: See 14 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.