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66HD740 vs 66HD745 18 of 19 identical Swap Change panels

Tongwei TWMNF-66HD740 vs Tongwei TWMNF-66HD745

Tongwei TWMNF-66HD740
TWMNF-66HD740
740 Wp 23.80 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
Tongwei TWMNF-66HD745
TWMNF-66HD745
745 Wp 24.00 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

66HD745 leads on the differences that matter

The largest is module efficiency: 0.20 pp more efficient. 18 of 19 comparable parameters are identical.

See the one difference
How alike are they
18 of 19 comparable
parameters are identical
identical differs
01

What actually differs

1 of 19 parameters
Parameter 66HD740 66HD745 Difference
Module efficiency 23.80 % 24.00 % 0.20 pp more efficient
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.
66HD740
24,828 kWh
66HD745
24,996 kWh
Lifetime gap
168 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 66HD740 66HD745
Standard test conditions 25 °C 100.0% of rated power 740 W 745 W
Cool, bright day 40 °C 95.8% of rated power 709 W 714 W
Typical summer roof 55 °C 91.6% of rated power 678 W 682 W
Hot roof 70 °C 87.4% of rated power 647 W 651 W
03

Full specification

Parameter 66HD740 66HD745 Difference
Power and efficiency
Rated power 740 Wp 745 Wp Effectively the same
Module efficiency 23.80 % 24.00 % +0.20 pp for 66HD745
Power density 238.2 Wp/m² 239.8 Wp/m² Effectively the same
Open-circuit voltage 49.80 V 49.95 V Effectively the same
Voltage at max power 41.69 V 41.86 V Effectively the same
Short-circuit current 18.81 A 18.87 A Effectively the same
Current at max power 17.75 A 17.80 A Effectively the same
Temperature
Temperature coefficient -0.280 %/°C -0.280 %/°C Same
Mechanical
Dimensions 2384x1303x33 mm 2384x1303x33 mm Same
Module area 3.106 m² 3.106 m² Same
Weight 37.3 kg 37.3 kg Same
Weight per kWp 50.4 kg/kWp 50.1 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
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 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#433 vs #303
66HD745 leads by 130 places
Power density
#431 vs #339
66HD745 leads by 92 places
Heat behaviour
#1,309 vs #1,309
Tied - the same position in the database
Weight
#3,784 vs #3,586
66HD745 leads by 198 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#183 vs #148
66HD745 leads by 35 places
05

More useful comparisons

Open the full database
Same series, other bin
Tongwei TWMNF-66HD740 vs Tongwei TWMNF-66HD750
3 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMNF-66HD740 vs Tongwei TWMNF-66HD735
The same specification on paper
Same series, other bin
Tongwei TWMNF-66HD740 vs Tongwei TWMNF-66HD730
3 differences, the largest is module efficiency
Same manufacturer
Tongwei TWMNF-66HD740 vs Tongwei TWMHF-66HD740X
3 differences, the largest is temperature coefficient
Same manufacturer
Tongwei TWMNF-66HD740 vs Tongwei THC G12-66 Bifacial
One difference: product warranty
Same manufacturer
Tongwei TWMNF-66HD740 vs Tongwei TWMHF-66HD735X
3 differences, the largest is temperature coefficient
06

Written summary

07

Questions about this pairing

Which panel is better: Tongwei TWMNF-66HD740 or Tongwei TWMNF-66HD745?
According to our database: Tongwei TWMNF-66HD745 has higher module efficiency (24.00% vs 23.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TWMNF-66HD740 and Tongwei TWMNF-66HD745?
Tongwei TWMNF-66HD740 has a module efficiency of 23.80%, while Tongwei TWMNF-66HD745 is 24.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei TWMNF-66HD740 use vs Tongwei TWMNF-66HD745?
Tongwei TWMNF-66HD740 uses TOPCon cells; Tongwei TWMNF-66HD745 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 Tongwei TWMNF-66HD740 and Tongwei TWMNF-66HD745?
Tongwei TWMNF-66HD740 has a 30 years power warranty; Tongwei TWMNF-66HD745 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 Tongwei TWMNF-66HD740 and Tongwei TWMNF-66HD745 bifacial panels?
Both Tongwei TWMNF-66HD740 and Tongwei TWMNF-66HD745 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.

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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.