Tongwei TWMNF-66HD vs Tongwei TNC G12-66 Monofacial
VS
The verdict
TWMNF-66HD leads on the differences that matter
The largest is product warranty: 3 yrs longer. 14 of 17 comparable parameters are identical, with 2 more left out because at least one datasheet does not publish them.
See all 3 differencesHow alike are they
14
of 17 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
3 of 17 parameters
What actually differs
Parameter
TWMNF-66HD
TNC G12-66 Monofacial
Difference
Product warranty
15 yrs
12 yrs
3 yrs longer
Bifacial
Yes
No
Yes vs No
Dimensions
2384x1303x33 mm
2384x1303 mm
2384x1303x33 mm vs 2384x1303 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.
TWMNF-66HD
23,990 kWh
TNC G12-66 Monofacial
23,822 kWh
Lifetime gap
168 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
TWMNF-66HD
TNC G12-66 Monofacial
Standard test conditions
25 °C
100.0% of rated power
715 W
710 W
Cool, bright day
40 °C
95.8% of rated power
685 W
680 W
Typical summer roof
55 °C
91.6% of rated power
655 W
650 W
Hot roof
70 °C
87.4% of rated power
625 W
621 W
03
Full specification
Parameter
TWMNF-66HD
TNC G12-66 Monofacial
Difference
Power and efficiency
Rated power
715 Wp
710 Wp
Effectively the same
Module efficiency
23.00 %
22.90 %
Effectively the same
Power density
230.2 Wp/m²
228.6 Wp/m²
Effectively the same
Open-circuit voltage
49.11 V
48.94 V
Effectively the same
Voltage at max power
40.86 V
40.69 V
Effectively the same
Short-circuit current
18.50 A
18.45 A
Effectively the same
Current at max power
17.50 A
17.45 A
Effectively the same
Temperature
Temperature coefficient
-0.280 %/°C
-0.280 %/°C
Same
Mechanical
Dimensions
2384x1303x33 mm
2384x1303 mm
2384x1303x33 mm vs 2384x1303 mm
Module area
3.106 m²
3.106 m²
Same
Weight
37.9 kg
37.9 kg
Same
Weight per kWp
53.0 kg/kWp
53.4 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
15 yrs
12 yrs
+3 yrs for TWMNF-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
Yes
No
Yes vs No
04
14,005 panels
Against the whole database
Efficiency
#1,919
vs
#2,359
TWMNF-66HD leads by 440 places
Power density
#2,018
vs
#2,474
TWMNF-66HD leads by 456 places
Heat behaviour
#1,309
vs
#1,309
Tied - the same position in the database
Weight
#6,744
vs
#7,271
TWMNF-66HD leads by 527 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#450
vs
#817
TWMNF-66HD leads by 367 places
05
Open the full database
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06
Written summary
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07
Questions about this pairing
Which panel is better: Tongwei TWMNF-66HD or Tongwei TNC G12-66 Monofacial?
According to our database: Tongwei TWMNF-66HD has higher module efficiency (23.00% vs 22.90%). 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 TNC G12-66 Monofacial?
Tongwei TWMNF-66HD has a module efficiency of 23.00%, while Tongwei TNC G12-66 Monofacial is 22.90%. 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 TNC G12-66 Monofacial?
Tongwei TWMNF-66HD uses TOPCon cells; Tongwei TNC G12-66 Monofacial 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 TNC G12-66 Monofacial?
Tongwei TWMNF-66HD has a 30 years power warranty; Tongwei TNC G12-66 Monofacial 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 TNC G12-66 Monofacial bifacial panels?
Tongwei TWMNF-66HD is bifacial (captures light from both faces); Tongwei TNC G12-66 Monofacial is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
Shop prices: See 59 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.