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66HD vs 66HD745 12 of 18 identical Swap Change panels

Tongwei TWMNF-66HD vs Tongwei TWMNF-66HD745

TWMNF-66HD
715 Wp 23.00 % TOPCon Bifacial Incomplete
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: 1.00 pp more efficient. 12 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 6 differences
How alike are they
12 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

6 of 18 parameters
Parameter 66HD 66HD745 Difference
Module efficiency 23.00 % 24.00 % 1.00 pp more efficient
Power density 230.2 Wp/m² 239.8 Wp/m² 9.7 Wp/m² higher
Rated power 715 Wp 745 Wp 30 W more power
Product warranty 15 yrs 12 yrs 3 yrs longer
Weight per kWp 53.0 kg/kWp 50.1 kg/kWp 2.9 kg/kWp lighter
Voltage at max power 40.86 V 41.86 V 1.00 V apart
02

What it means on a roof

Thirty years of production
A 1.0% first-year loss then 0.40% a year, assumed for both panels, 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.
66HD
23,990 kWh
66HD745
24,996 kWh
Lifetime gap
1,006 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 66HD 66HD745
Standard test conditions 25 °C 100.0% of rated power 715 W 745 W
Cool, bright day 40 °C 95.8% of rated power 685 W 714 W
Typical summer roof 55 °C 91.6% of rated power 655 W 682 W
Hot roof 70 °C 87.4% of rated power 625 W 651 W
03

Full specification

Parameter 66HD 66HD745 Difference
Power and efficiency
Rated power 715 Wp 745 Wp +30 W for 66HD745
Module efficiency 23.00 % 24.00 % +1.00 pp for 66HD745
Power density 230.2 Wp/m² 239.8 Wp/m² +9.7 Wp/m² for 66HD745
Open-circuit voltage 49.11 V 49.95 V Effectively the same
Voltage at max power 40.86 V 41.86 V 1.00 V apart
Short-circuit current 18.50 A 18.87 A Effectively the same
Current at max power 17.50 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 37.9 kg 37.3 kg Effectively the same
Weight per kWp 53.0 kg/kWp 50.1 kg/kWp -2.9 kg/kWp for 66HD745
Warranty and degradation
Product warranty 15 yrs 12 yrs +3 yrs for 66HD
Performance warranty 30 yrs 30 yrs Same
Annual degradation - 0.40 %/yr Not published by Tongwei
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
#1,919 vs #303
66HD745 leads by 1,616 places
Power density
#2,018 vs #339
66HD745 leads by 1,679 places
Heat behaviour
#1,309 vs #1,309
Tied - the same position in the database
Weight
#6,744 vs #3,586
66HD745 leads by 3,158 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#450 vs #148
66HD745 leads by 302 places
05

More useful comparisons

Open the full database
Same series, other bin
Tongwei TWMNF-66HD vs Tongwei THC G12-66 Bifacial
6 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMNF-66HD vs Tongwei TWMNH-66HS
7 differences, the largest is rated power
Same series, other bin
Tongwei TWMNF-66HD vs Tongwei TWMNH-66HD
7 differences, the largest is rated power
Same series, other bin
Tongwei TWMNF-66HD vs Tongwei TWMNH-54HD
11 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMNF-66HD vs Tongwei TWMNH-48HC
11 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMNF-66HD745 vs Tongwei TWMNF-66HD750
The same specification on paper
06

Written summary

07

Questions about this pairing

Which panel is better: Tongwei TWMNF-66HD or Tongwei TWMNF-66HD745?
According to our database: Tongwei TWMNF-66HD745 has higher module efficiency (24.00% vs 23.00%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TWMNF-66HD and Tongwei TWMNF-66HD745?
Tongwei TWMNF-66HD has a module efficiency of 23.00%, 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-66HD use vs Tongwei TWMNF-66HD745?
Tongwei TWMNF-66HD 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-66HD and Tongwei TWMNF-66HD745?
Tongwei TWMNF-66HD 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-66HD and Tongwei TWMNF-66HD745 bifacial panels?
Both Tongwei TWMNF-66HD 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.

Shop prices: See 71 Tongwei 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.