Suntech STP450S-H48-Nth+ vs Suntech STP620S-H66-Nsh+
VS
The verdict
10 differences, and they point both ways
The largest is rated power: 170 W more power. 9 of 19 comparable parameters are identical.
See all 10 differencesHow alike are they
9
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
10 of 19 parameters
What actually differs
Parameter
STP450S-H48-Nth+
STP620S-H66-Nsh+
Difference
Rated power
450 Wp
620 Wp
170 W more power
Module efficiency
22.50 %
23.00 %
0.50 pp more efficient
Weight
24.0 kg
33.1 kg
9.1 kg lighter
Product warranty
25 yrs
15 yrs
10 yrs longer
Open-circuit voltage
35.44 V
48.90 V
13.46 V apart
Module area
1.998 m²
2.701 m²
0.703 m² apart
Power density
225.2 Wp/m²
229.5 Wp/m²
4.3 Wp/m² higher
Voltage at max power
29.86 V
40.90 V
11.04 V apart
Cell count
96
132
36 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 (-0.280 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
STP450S-H48-Nth+
15,098 kWh
STP620S-H66-Nsh+
20,802 kWh
Lifetime gap
5,704 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
STP450S-H48-Nth+
STP620S-H66-Nsh+
Standard test conditions
25 °C
100.0% of rated power
450 W
620 W
Cool, bright day
40 °C
95.8% of rated power
431 W
594 W
Typical summer roof
55 °C
91.6% of rated power
412 W
568 W
Hot roof
70 °C
87.4% of rated power
393 W
542 W
03
Full specification
Parameter
STP450S-H48-Nth+
STP620S-H66-Nsh+
Difference
Power and efficiency
Rated power
450 Wp
620 Wp
+170 W for STP620S-H66-Nsh+
Module efficiency
22.50 %
23.00 %
+0.50 pp for STP620S-H66-Nsh+
Power density
225.2 Wp/m²
229.5 Wp/m²
+4.3 Wp/m² for STP620S-H66-Nsh+
Open-circuit voltage
35.44 V
48.90 V
13.46 V apart
Voltage at max power
29.86 V
40.90 V
11.04 V apart
Short-circuit current
15.97 A
15.96 A
Effectively the same
Current at max power
15.08 A
15.16 A
Effectively the same
Temperature
Temperature coefficient
-0.280 %/°C
-0.280 %/°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
24.0 kg
33.1 kg
-9.1 kg for STP450S-H48-Nth+
Weight per kWp
53.3 kg/kWp
53.4 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
25 yrs
15 yrs
+10 yrs for STP450S-H48-Nth+
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
96
132
36 cells apart
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#4,222
vs
#1,919
STP620S-H66-Nsh+ leads by 2,303 places
Power density
#4,225
vs
#2,191
STP620S-H66-Nsh+ leads by 2,034 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#7,178
vs
#7,289
STP450S-H48-Nth+ leads by 111 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#6,199
vs
#2,048
STP620S-H66-Nsh+ leads by 4,151 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 STP450S-H48-Nth+ or Suntech STP620S-H66-Nsh+?
According to our database: Suntech STP620S-H66-Nsh+ has higher module efficiency (23.00% vs 22.50%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Suntech STP450S-H48-Nth+ and Suntech STP620S-H66-Nsh+?
Suntech STP450S-H48-Nth+ has a module efficiency of 22.50%, while Suntech STP620S-H66-Nsh+ is 23.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Suntech STP450S-H48-Nth+ use vs Suntech STP620S-H66-Nsh+?
Suntech STP450S-H48-Nth+ uses TOPCon cells; Suntech STP620S-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 STP450S-H48-Nth+ and Suntech STP620S-H66-Nsh+?
Suntech STP450S-H48-Nth+ has a 30 years power warranty; Suntech STP620S-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 STP450S-H48-Nth+ and Suntech STP620S-H66-Nsh+ bifacial panels?
Both Suntech STP450S-H48-Nth+ and Suntech STP620S-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 22 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.