Suntech STP445S-B72/Vnh vs Suntech STP705S-D66-Nsh+
VS
The verdict
STP705S-D66-Nsh+ leads on the differences that matter
The largest is module efficiency: 2.30 pp more efficient. 5 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.
See all 13 differencesHow alike are they
5
of 18 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
13 of 18 parameters
What actually differs
Parameter
STP445S-B72/Vnh
STP705S-D66-Nsh+
Difference
Module efficiency
20.40 %
22.70 %
2.30 pp more efficient
Temperature coefficient
-0.360 %/°C
-0.290 %/°C
0.070 %/°C better in heat
Rated power
445 Wp
705 Wp
260 W more power
Power density
204.4 Wp/m²
227.0 Wp/m²
22.5 Wp/m² higher
Performance warranty
25 yrs
30 yrs
5 yrs longer
Annual degradation
0.55 %/yr
0.40 %/yr
0.15 %/yr slower
Weight
24.5 kg
38.5 kg
14.0 kg lighter
Short-circuit current
11.54 A
18.43 A
6.89 A apart
Module area
2.177 m²
3.106 m²
0.930 m² apart
Current at max power
10.81 A
17.49 A
6.68 A apart
Cell count
144
132
12 cells apart
Bifacial
No
Yes
No vs Yes
Dimensions
2095x1039x35 mm
2384x1303x33 mm
2095x1039x35 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
STP445S-B72/Vnh
14,422 kWh
STP705S-D66-Nsh+
23,654 kWh
Lifetime gap
9,232 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
STP445S-B72/Vnh
STP705S-D66-Nsh+
Standard test conditions
25 °C
100.0% of rated power
445 W
705 W
Cool, bright day
40 °C
94.6% of rated power
421 W
674 W
Typical summer roof
55 °C
89.2% of rated power
397 W
644 W
Hot roof
70 °C
83.8% of rated power
373 W
613 W
03
Full specification
Parameter
STP445S-B72/Vnh
STP705S-D66-Nsh+
Difference
Power and efficiency
Rated power
445 Wp
705 Wp
+260 W for STP705S-D66-Nsh+
Module efficiency
20.40 %
22.70 %
+2.30 pp for STP705S-D66-Nsh+
Power density
204.4 Wp/m²
227.0 Wp/m²
+22.5 Wp/m² for STP705S-D66-Nsh+
Open-circuit voltage
49.00 V
48.57 V
Effectively the same
Voltage at max power
41.20 V
40.31 V
Effectively the same
Short-circuit current
11.54 A
18.43 A
6.89 A apart
Current at max power
10.81 A
17.49 A
6.68 A apart
Temperature
Temperature coefficient
-0.360 %/°C
-0.290 %/°C
+0.070 %/°C for STP705S-D66-Nsh+
Mechanical
Dimensions
2095x1039x35 mm
2384x1303x33 mm
2095x1039x35 mm vs 2384x1303x33 mm
Module area
2.177 m²
3.106 m²
0.930 m² apart
Weight
24.5 kg
38.5 kg
-14.0 kg for STP445S-B72/Vnh
Weight per kWp
55.1 kg/kWp
54.6 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
25 yrs
30 yrs
+5 yrs for STP705S-D66-Nsh+
Annual degradation
0.55 %/yr
0.40 %/yr
-0.15 %/yr for STP705S-D66-Nsh+
Technology
Cell technology
-
TOPCon
Not published by Suntech
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
144
132
12 cells apart
Bifacial
No
Yes
No vs Yes
04
14,129 panels
Against the whole database
Efficiency
#11,680
vs
#3,364
STP705S-D66-Nsh+ leads by 8,316 places
Power density
#11,609
vs
#3,418
STP705S-D66-Nsh+ leads by 8,191 places
Heat behaviour
#12,425
vs
#2,220
STP705S-D66-Nsh+ leads by 10,205 places
Weight
#9,519
vs
#9,041
STP705S-D66-Nsh+ leads by 478 places
Warranty
#9,912
vs
#21
STP705S-D66-Nsh+ leads by 9,891 places
Overall
#11,533
vs
#1,052
STP705S-D66-Nsh+ leads by 10,481 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 STP445S-B72/Vnh or Suntech STP705S-D66-Nsh+?
According to our database: Suntech STP705S-D66-Nsh+ has higher module efficiency (22.70% vs 20.40%); Suntech STP705S-D66-Nsh+ tolerates heat better (temp coeff -0.290%/°C vs -0.360%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Suntech STP445S-B72/Vnh and Suntech STP705S-D66-Nsh+?
Suntech STP445S-B72/Vnh has a module efficiency of 20.40%, while Suntech STP705S-D66-Nsh+ is 22.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Suntech STP445S-B72/Vnh use vs Suntech STP705S-D66-Nsh+?
Suntech STP445S-B72/Vnh uses Monocrystalline cells; Suntech STP705S-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 STP445S-B72/Vnh and Suntech STP705S-D66-Nsh+?
Suntech STP445S-B72/Vnh has a 25 years power warranty; Suntech STP705S-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 STP445S-B72/Vnh and Suntech STP705S-D66-Nsh+ bifacial panels?
Suntech STP705S-D66-Nsh+ is bifacial (captures light from both faces); Suntech STP445S-B72/Vnh is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
Shop prices: See 16 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.