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STP445S-B72/Vnh vs STP735S-D66-Nsh+ 3 of 18 identical Swap Change panels

Suntech STP445S-B72/Vnh vs Suntech STP735S-D66-Nsh+

Suntech STP445S-B72/Vnh
STP445S-B72/Vnh
445 Wp 20.40 %
Open panel page Datasheet PDF
VS
Suntech STP735S-D66-Nsh+
STP735S-D66-Nsh+
735 Wp 23.70 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

STP735S-D66-Nsh+ leads on the differences that matter

The largest is module efficiency: 3.30 pp more efficient. 3 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 15 differences
How alike are they
3 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

15 of 18 parameters
Parameter STP445S-B72/Vnh STP735S-D66-Nsh+ Difference
Module efficiency 20.40 % 23.70 % 3.30 pp more efficient
Temperature coefficient -0.360 %/°C -0.280 %/°C 0.080 %/°C better in heat
Rated power 445 Wp 735 Wp 290 W more power
Power density 204.4 Wp/m² 236.6 Wp/m² 32.2 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 37.5 kg 13.0 kg lighter
Product warranty 12 yrs 15 yrs 3 yrs longer
Short-circuit current 11.54 A 18.58 A 7.04 A apart
Module area 2.177 m² 3.106 m² 0.930 m² apart
Weight per kWp 55.1 kg/kWp 51.0 kg/kWp 4.0 kg/kWp lighter
Current at max power 10.81 A 17.74 A 6.93 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
STP735S-D66-Nsh+
24,661 kWh
Lifetime gap
10,239 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario STP445S-B72/Vnh STP735S-D66-Nsh+
Standard test conditions 25 °C 100.0% of rated power 445 W 735 W
Cool, bright day 40 °C 94.6% of rated power 421 W 704 W
Typical summer roof 55 °C 89.2% of rated power 397 W 673 W
Hot roof 70 °C 83.8% of rated power 373 W 642 W
03

Full specification

Parameter STP445S-B72/Vnh STP735S-D66-Nsh+ Difference
Power and efficiency
Rated power 445 Wp 735 Wp +290 W for STP735S-D66-Nsh+
Module efficiency 20.40 % 23.70 % +3.30 pp for STP735S-D66-Nsh+
Power density 204.4 Wp/m² 236.6 Wp/m² +32.2 Wp/m² for STP735S-D66-Nsh+
Open-circuit voltage 49.00 V 49.86 V Effectively the same
Voltage at max power 41.20 V 41.47 V Effectively the same
Short-circuit current 11.54 A 18.58 A 7.04 A apart
Current at max power 10.81 A 17.74 A 6.93 A apart
Temperature
Temperature coefficient -0.360 %/°C -0.280 %/°C +0.080 %/°C for STP735S-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 37.5 kg -13.0 kg for STP445S-B72/Vnh
Weight per kWp 55.1 kg/kWp 51.0 kg/kWp -4.0 kg/kWp for STP735S-D66-Nsh+
Warranty and degradation
Product warranty 12 yrs 15 yrs +3 yrs for STP735S-D66-Nsh+
Performance warranty 25 yrs 30 yrs +5 yrs for STP735S-D66-Nsh+
Annual degradation 0.55 %/yr 0.40 %/yr -0.15 %/yr for STP735S-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

Against the whole database

14,129 panels
Efficiency
#11,680 vs #549
STP735S-D66-Nsh+ leads by 11,131 places
Power density
#11,609 vs #614
STP735S-D66-Nsh+ leads by 10,995 places
Heat behaviour
#12,425 vs #1,347
STP735S-D66-Nsh+ leads by 11,078 places
Weight
#9,519 vs #4,383
STP735S-D66-Nsh+ leads by 5,136 places
Warranty
#9,912 vs #21
STP735S-D66-Nsh+ leads by 9,891 places
Overall
#11,533 vs #155
STP735S-D66-Nsh+ leads by 11,378 places
05

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06

Written summary

07

Questions about this pairing

Which panel is better: Suntech STP445S-B72/Vnh or Suntech STP735S-D66-Nsh+?
According to our database: Suntech STP735S-D66-Nsh+ has higher module efficiency (23.70% vs 20.40%); Suntech STP735S-D66-Nsh+ tolerates heat better (temp coeff -0.280%/°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 STP735S-D66-Nsh+?
Suntech STP445S-B72/Vnh has a module efficiency of 20.40%, while Suntech STP735S-D66-Nsh+ is 23.70%. 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 STP735S-D66-Nsh+?
Suntech STP445S-B72/Vnh uses Monocrystalline cells; Suntech STP735S-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 STP735S-D66-Nsh+?
Suntech STP445S-B72/Vnh has a 25 years power warranty; Suntech STP735S-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 STP735S-D66-Nsh+ bifacial panels?
Suntech STP735S-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.