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72 Bifacial vs 78 Bifacial 12 of 18 identical Swap Change panels

Tongwei TNC M10-72 Bifacial vs Tongwei TNC M10-78 Bifacial

TNC M10-72 Bifacial
590 Wp 22.80 % TOPCon
Open panel page Datasheet PDF
VS
TNC M10-78 Bifacial
635 Wp 22.70 % TOPCon
Open panel page Datasheet PDF
The verdict

78 Bifacial leads on the differences that matter

The largest is rated power: 45 W more power. 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 72 Bifacial 78 Bifacial Difference
Rated power 590 Wp 635 Wp 45 W more power
Open-circuit voltage 52.70 V 57.20 V 4.50 V apart
Module area 2.583 m² 2.795 m² 0.212 m² apart
Weight 31.5 kg 33.8 kg 2.3 kg lighter
Voltage at max power 44.27 V 48.05 V 3.78 V apart
Dimensions 2278x1134 mm 2465x1134 mm 2278x1134 mm vs 2465x1134 mm
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.
72 Bifacial
19,796 kWh
78 Bifacial
21,306 kWh
Lifetime gap
1,510 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 72 Bifacial 78 Bifacial
Standard test conditions 25 °C 100.0% of rated power 590 W 635 W
Cool, bright day 40 °C 95.8% of rated power 565 W 608 W
Typical summer roof 55 °C 91.6% of rated power 540 W 582 W
Hot roof 70 °C 87.4% of rated power 516 W 555 W
03

Full specification

Parameter 72 Bifacial 78 Bifacial Difference
Power and efficiency
Rated power 590 Wp 635 Wp +45 W for 78 Bifacial
Module efficiency 22.80 % 22.70 % Effectively the same
Power density 228.4 Wp/m² 227.2 Wp/m² Effectively the same
Open-circuit voltage 52.70 V 57.20 V 4.50 V apart
Voltage at max power 44.27 V 48.05 V 3.78 V apart
Short-circuit current 13.90 A 13.82 A Effectively the same
Current at max power 13.33 A 13.22 A Effectively the same
Temperature
Temperature coefficient -0.280 %/°C -0.280 %/°C Same
Mechanical
Dimensions 2278x1134 mm 2465x1134 mm 2278x1134 mm vs 2465x1134 mm
Module area 2.583 m² 2.795 m² 0.212 m² apart
Weight 31.5 kg 33.8 kg -2.3 kg for 72 Bifacial
Weight per kWp 53.4 kg/kWp 53.2 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 - - Neither datasheet publishes this
Bifacial No No Same
04

Against the whole database

14,129 panels
Efficiency
#2,769 vs #3,364
72 Bifacial leads by 595 places
Power density
#2,653 vs #3,309
72 Bifacial leads by 656 places
Heat behaviour
#1,347 vs #1,347
Tied - the same position in the database
Weight
#7,361 vs #7,136
78 Bifacial leads by 225 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#3,836 vs #2,414
78 Bifacial leads by 1,422 places
05

More useful comparisons

Open the full database
Same series, other bin
Tongwei TNC M10-72 Bifacial vs Tongwei THC G12-66 Bifacial
13 differences, the largest is module efficiency
Same series, other bin
Tongwei TNC M10-72 Bifacial vs Tongwei TWMNF-66HD
11 differences, the largest is rated power
Same series, other bin
Tongwei TNC M10-72 Bifacial vs Tongwei TNC G12-66 Monofacial
8 differences, the largest is rated power
Same series, other bin
Tongwei TNC M10-72 Bifacial vs Tongwei TNC G12-66 Bifacial
8 differences, the largest is rated power
Same series, other bin
Tongwei TNC M10-72 Bifacial vs Tongwei TWMNH-66HS
12 differences, the largest is rated power
Same series, other bin
Tongwei TNC M10-72 Bifacial vs Tongwei TWMNH-66HD
11 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Tongwei TNC M10-72 Bifacial or Tongwei TNC M10-78 Bifacial?
According to our database: Tongwei TNC M10-72 Bifacial has higher module efficiency (22.80% vs 22.70%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TNC M10-72 Bifacial and Tongwei TNC M10-78 Bifacial?
Tongwei TNC M10-72 Bifacial has a module efficiency of 22.80%, while Tongwei TNC M10-78 Bifacial is 22.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei TNC M10-72 Bifacial use vs Tongwei TNC M10-78 Bifacial?
Tongwei TNC M10-72 Bifacial uses TOPCon cells; Tongwei TNC M10-78 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 TNC M10-72 Bifacial and Tongwei TNC M10-78 Bifacial?
Tongwei TNC M10-72 Bifacial has a 30 years power warranty; Tongwei TNC M10-78 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.

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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.