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66HD705XX vs 66HD715XX 15 of 18 identical Swap Change panels

Tongwei TWMNF-66HD705XX vs Tongwei TWMNF-66HD715XX

TWMNF-66HD705XX
705 Wp 22.70 % N-type Bifacial Incomplete
Open panel page Datasheet PDF
VS
TWMNF-66HD715XX
715 Wp 23.00 % N-type Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

66HD715XX leads on the differences that matter

The largest is module efficiency: 0.30 pp more efficient. 15 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 3 differences
How alike are they
15 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

3 of 18 parameters
Parameter 66HD705XX 66HD715XX Difference
Module efficiency 22.70 % 23.00 % 0.30 pp more efficient
Power density 227.0 Wp/m² 230.2 Wp/m² 3.2 Wp/m² higher
Rated power 705 Wp 715 Wp 10 W more power
02

What it means on a roof

Thirty years of production
Declared first-year losses, with 0.40% a year afterwards 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.
66HD705XX
23,654 kWh
66HD715XX
23,990 kWh
Lifetime gap
336 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 66HD705XX 66HD715XX
Standard test conditions 25 °C 100.0% of rated power 705 W 715 W
Cool, bright day 40 °C 95.8% of rated power 675 W 685 W
Typical summer roof 55 °C 91.6% of rated power 646 W 655 W
Hot roof 70 °C 87.4% of rated power 616 W 625 W
03

Full specification

Parameter 66HD705XX 66HD715XX Difference
Power and efficiency
Rated power 705 Wp 715 Wp +10 W for 66HD715XX
Module efficiency 22.70 % 23.00 % +0.30 pp for 66HD715XX
Power density 227.0 Wp/m² 230.2 Wp/m² +3.2 Wp/m² for 66HD715XX
Open-circuit voltage 48.71 V 49.11 V Effectively the same
Voltage at max power 40.52 V 40.69 V Effectively the same
Short-circuit current 18.56 A 18.55 A Effectively the same
Current at max power 17.60 A 17.60 A 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 37.9 kg Same
Weight per kWp 53.8 kg/kWp 53.0 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation - - Neither datasheet publishes this
Technology
Cell technology N-type N-type Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#3,307 vs #1,919
66HD715XX leads by 1,388 places
Power density
#3,361 vs #2,018
66HD715XX leads by 1,343 places
Heat behaviour
#1,309 vs #1,309
Tied - the same position in the database
Weight
#7,811 vs #6,744
66HD715XX leads by 1,067 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,007 vs #678
66HD715XX leads by 329 places
05

More useful comparisons

Open the full database
Same series, other bin
Tongwei TWMNF-66HD705XX vs Tongwei TWMNF-66HD720XX
3 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMNF-66HD705XX vs Tongwei TWMNF-66HD710XX
One difference: module efficiency
Same series, other bin
Tongwei TWMNF-66HD705XX vs Tongwei TWMNF-66HD700XX
One difference: module efficiency
Same manufacturer
Tongwei TWMNF-66HD705XX vs Tongwei TWMNF-66HD750
7 differences, the largest is module efficiency
Same manufacturer
Tongwei TWMNF-66HD705XX vs Tongwei TWMNF-66HD745
7 differences, the largest is module efficiency
Same manufacturer
Tongwei TWMNF-66HD705XX vs Tongwei TWMNF-66HD740
7 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Tongwei TWMNF-66HD705XX or Tongwei TWMNF-66HD715XX?
According to our database: Tongwei TWMNF-66HD715XX has higher module efficiency (23.00% vs 22.70%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TWMNF-66HD705XX and Tongwei TWMNF-66HD715XX?
Tongwei TWMNF-66HD705XX has a module efficiency of 22.70%, while Tongwei TWMNF-66HD715XX is 23.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei TWMNF-66HD705XX use vs Tongwei TWMNF-66HD715XX?
Tongwei TWMNF-66HD705XX uses N-type cells; Tongwei TWMNF-66HD715XX uses N-type. 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-66HD705XX and Tongwei TWMNF-66HD715XX?
Tongwei TWMNF-66HD705XX has a 30 years power warranty; Tongwei TWMNF-66HD715XX 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-66HD705XX and Tongwei TWMNF-66HD715XX bifacial panels?
Both Tongwei TWMNF-66HD705XX and Tongwei TWMNF-66HD715XX 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.