Skip to main content
TNC G12R-66 Monofacial vs TWMNH-66HD 12 of 17 identical Swap Change panels

Tongwei TNC G12R-66 Monofacial vs Tongwei TWMNH-66HD

TNC G12R-66 Monofacial
620 Wp 23.00 % TOPCon
Open panel page Datasheet PDF
VS
TWMNH-66HD
620 Wp 22.95 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

TWMNH-66HD leads on the differences that matter

The largest is weight: 3.5 kg lighter. 12 of 17 comparable parameters are identical, with 2 more left out because at least one datasheet does not publish them.

See all 5 differences
How alike are they
12 of 17 comparable
parameters are identical
identical differs not published
01

What actually differs

5 of 17 parameters
Parameter TNC G12R-66 Monofacial TWMNH-66HD Difference
Weight 32.5 kg 29.0 kg 3.5 kg lighter
Product warranty 12 yrs 15 yrs 3 yrs longer
Weight per kWp 52.4 kg/kWp 46.8 kg/kWp 5.6 kg/kWp lighter
Bifacial No Yes No vs Yes
Dimensions 2382x1134 mm 2382x1134x30 mm 2382x1134 mm vs 2382x1134x30 mm
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.
TNC G12R-66 Monofacial
20,802 kWh
TWMNH-66HD
20,802 kWh
Lifetime gap
No difference
Output when it is hot
Rated power carried across the range a module actually sees
Scenario TNC G12R-66 Monofacial TWMNH-66HD
Standard test conditions 25 °C 100.0% of rated power 620 W 620 W
Cool, bright day 40 °C 95.8% of rated power 594 W 594 W
Typical summer roof 55 °C 91.6% of rated power 568 W 568 W
Hot roof 70 °C 87.4% of rated power 542 W 542 W
03

Full specification

Parameter TNC G12R-66 Monofacial TWMNH-66HD Difference
Power and efficiency
Rated power 620 Wp 620 Wp Same
Module efficiency 23.00 % 22.95 % Effectively the same
Power density 229.5 Wp/m² 229.5 Wp/m² Same
Open-circuit voltage 48.30 V 49.10 V Effectively the same
Voltage at max power 41.55 V 40.82 V Effectively the same
Short-circuit current 15.95 A 16.06 A Effectively the same
Current at max power 14.93 A 15.19 A Effectively the same
Temperature
Temperature coefficient -0.280 %/°C -0.280 %/°C Same
Mechanical
Dimensions 2382x1134 mm 2382x1134x30 mm 2382x1134 mm vs 2382x1134x30 mm
Module area 2.701 m² 2.701 m² Same
Weight 32.5 kg 29.0 kg -3.5 kg for TWMNH-66HD
Weight per kWp 52.4 kg/kWp 46.8 kg/kWp -5.6 kg/kWp for TWMNH-66HD
Warranty and degradation
Product warranty 12 yrs 15 yrs +3 yrs for TWMNH-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 Not published by Tongwei
Bifacial No Yes No vs Yes
04

Against the whole database

14,005 panels
Efficiency
#1,919 vs #2,268
TNC G12R-66 Monofacial leads by 349 places
Power density
#2,191 vs #2,191
Tied - the same position in the database
Heat behaviour
#1,309 vs #1,309
Tied - the same position in the database
Weight
#5,893 vs #1,343
TWMNH-66HD leads by 4,550 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,525 vs #2,013
TWMNH-66HD leads by 512 places
05

More useful comparisons

Open the full database
Same series, other bin
Tongwei TNC G12R-66 Monofacial vs Tongwei THC G12-66 Bifacial
12 differences, the largest is module efficiency
Same series, other bin
Tongwei TNC G12R-66 Monofacial vs Tongwei TWMNF-66HD
8 differences, the largest is rated power
Same series, other bin
Tongwei TNC G12R-66 Monofacial vs Tongwei TNC G12-66 Monofacial
6 differences, the largest is rated power
Same series, other bin
Tongwei TNC G12R-66 Monofacial vs Tongwei TNC G12-66 Bifacial
8 differences, the largest is rated power
Same series, other bin
Tongwei TNC G12R-66 Monofacial vs Tongwei TNC M10-78 Bifacial
9 differences, the largest is open-circuit voltage
Same series, other bin
Tongwei TNC G12R-66 Monofacial vs Tongwei TWMNH-66HS
5 differences, the largest is weight
06

Written summary

07

Questions about this pairing

Which panel is better: Tongwei TNC G12R-66 Monofacial or Tongwei TWMNH-66HD?
According to our database: Tongwei TNC G12R-66 Monofacial has higher module efficiency (23.00% vs 22.95%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TNC G12R-66 Monofacial and Tongwei TWMNH-66HD?
Tongwei TNC G12R-66 Monofacial has a module efficiency of 23.00%, while Tongwei TWMNH-66HD is 22.95%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei TNC G12R-66 Monofacial use vs Tongwei TWMNH-66HD?
Tongwei TNC G12R-66 Monofacial uses TOPCon cells; Tongwei TWMNH-66HD 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 TNC G12R-66 Monofacial and Tongwei TWMNH-66HD?
Tongwei TNC G12R-66 Monofacial has a 30 years power warranty; Tongwei TWMNH-66HD 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 TNC G12R-66 Monofacial and Tongwei TWMNH-66HD bifacial panels?
Tongwei TWMNH-66HD is bifacial (captures light from both faces); Tongwei TNC G12R-66 Monofacial is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

Shop prices: See 72 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.