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TWMNF-66HD vs THC G12-66 Bifacial 12 of 18 identical Swap Change panels

Tongwei TWMNF-66HD vs Tongwei THC G12-66 Bifacial

TWMNF-66HD
715 Wp 23.00 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
VS
THC G12-66 Bifacial
740 Wp 23.80 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

THC G12-66 Bifacial leads on the differences that matter

The largest is module efficiency: 0.80 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 TWMNF-66HD THC G12-66 Bifacial Difference
Module efficiency 23.00 % 23.80 % 0.80 pp more efficient
Power density 230.2 Wp/m² 238.2 Wp/m² 8.0 Wp/m² higher
Rated power 715 Wp 740 Wp 25 W more power
Weight per kWp 53.0 kg/kWp 50.0 kg/kWp 3.0 kg/kWp lighter
Open-circuit voltage 49.11 V 50.62 V 1.51 V apart
Voltage at max power 40.86 V 42.32 V 1.46 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.
TWMNF-66HD
23,990 kWh
THC G12-66 Bifacial
24,828 kWh
Lifetime gap
838 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario TWMNF-66HD THC G12-66 Bifacial
Standard test conditions 25 °C 100.0% of rated power 715 W 740 W
Cool, bright day 40 °C 95.8% of rated power 685 W 709 W
Typical summer roof 55 °C 91.6% of rated power 655 W 678 W
Hot roof 70 °C 87.4% of rated power 625 W 647 W
03

Full specification

Parameter TWMNF-66HD THC G12-66 Bifacial Difference
Power and efficiency
Rated power 715 Wp 740 Wp +25 W for THC G12-66 Bifacial
Module efficiency 23.00 % 23.80 % +0.80 pp for THC G12-66 Bifacial
Power density 230.2 Wp/m² 238.2 Wp/m² +8.0 Wp/m² for THC G12-66 Bifacial
Open-circuit voltage 49.11 V 50.62 V 1.51 V apart
Voltage at max power 40.86 V 42.32 V 1.46 V apart
Short-circuit current 18.50 A 18.47 A Effectively the same
Current at max power 17.50 A 17.49 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 37.0 kg Effectively the same
Weight per kWp 53.0 kg/kWp 50.0 kg/kWp -3.0 kg/kWp for THC G12-66 Bifacial
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation - - Neither datasheet publishes this
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 #433
THC G12-66 Bifacial leads by 1,486 places
Power density
#2,018 vs #431
THC G12-66 Bifacial leads by 1,587 places
Heat behaviour
#1,309 vs #1,309
Tied - the same position in the database
Weight
#6,744 vs #3,317
THC G12-66 Bifacial leads by 3,427 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#450 vs #130
THC G12-66 Bifacial leads by 320 places
05

More useful comparisons

Open the full database
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 manufacturer
Tongwei TWMNF-66HD vs Tongwei TWMNF-66HD750
6 differences, the largest is module efficiency
Same manufacturer
Tongwei TWMNF-66HD vs Tongwei TWMNF-66HD745
6 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Tongwei TWMNF-66HD or Tongwei THC G12-66 Bifacial?
According to our database: Tongwei THC G12-66 Bifacial has higher module efficiency (23.80% 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 THC G12-66 Bifacial?
Tongwei TWMNF-66HD has a module efficiency of 23.00%, while Tongwei THC G12-66 Bifacial is 23.80%. 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 THC G12-66 Bifacial?
Tongwei TWMNF-66HD uses TOPCon cells; Tongwei THC G12-66 Bifacial 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 THC G12-66 Bifacial?
Tongwei TWMNF-66HD has a 30 years power warranty; Tongwei THC G12-66 Bifacial 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 THC G12-66 Bifacial bifacial panels?
Both Tongwei TWMNF-66HD and Tongwei THC G12-66 Bifacial 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.