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66HD735X vs 66HD720X 16 of 19 identical Swap Change panels

Tongwei TWMHF-66HD735X vs Tongwei TWMHF-66HD720X

TWMHF-66HD735X
735 Wp 23.70 % N-type Bifacial
Open panel page Datasheet PDF
VS
TWMHF-66HD720X
720 Wp 23.20 % N-type Bifacial
Open panel page Datasheet PDF
The verdict

66HD735X leads on the differences that matter

The largest is module efficiency: 0.50 pp more efficient. 16 of 19 comparable parameters are identical.

See all 3 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter 66HD735X 66HD720X Difference
Module efficiency 23.70 % 23.20 % 0.50 pp more efficient
Power density 236.6 Wp/m² 231.8 Wp/m² 4.8 Wp/m² higher
Rated power 735 Wp 720 Wp 15 W more power
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 (-0.240 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
66HD735X
24,757 kWh
66HD720X
24,251 kWh
Lifetime gap
506 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 66HD735X 66HD720X
Standard test conditions 25 °C 100.0% of rated power 735 W 720 W
Cool, bright day 40 °C 96.4% of rated power 709 W 694 W
Typical summer roof 55 °C 92.8% of rated power 682 W 668 W
Hot roof 70 °C 89.2% of rated power 656 W 642 W
03

Full specification

Parameter 66HD735X 66HD720X Difference
Power and efficiency
Rated power 735 Wp 720 Wp +15 W for 66HD735X
Module efficiency 23.70 % 23.20 % +0.50 pp for 66HD735X
Power density 236.6 Wp/m² 231.8 Wp/m² +4.8 Wp/m² for 66HD735X
Open-circuit voltage 50.54 V 50.30 V Effectively the same
Voltage at max power 42.22 V 41.94 V Effectively the same
Short-circuit current 18.37 A 18.08 A Effectively the same
Current at max power 17.41 A 17.17 A Effectively the same
Temperature
Temperature coefficient -0.240 %/°C -0.240 %/°C Same
Mechanical
Dimensions 2384x1303x33 mm 2384x1303x33 mm Same
Module area 3.106 m² 3.106 m² Same
Weight 37.0 kg 37.0 kg Same
Weight per kWp 50.3 kg/kWp 51.4 kg/kWp Effectively the same
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.38 %/yr 0.38 %/yr Same
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
#517 vs #1,306
66HD735X leads by 789 places
Power density
#582 vs #1,347
66HD735X leads by 765 places
Heat behaviour
#13 vs #13
Tied - the same position in the database
Weight
#3,719 vs #4,775
66HD735X leads by 1,056 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#155 vs #330
66HD735X leads by 175 places
05

More useful comparisons

Open the full database
Same series, other bin
Tongwei TWMHF-66HD735X vs Tongwei TWMHF-66HD740X
The same specification on paper
Same series, other bin
Tongwei TWMHF-66HD735X vs Tongwei TWMHF-66HD730X
One difference: module efficiency
Same series, other bin
Tongwei TWMHF-66HD735X vs Tongwei TWMHF-66HD725X
3 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMHF-66HD735X vs Tongwei TWMHF-66HD715X
3 differences, the largest is module efficiency
Same manufacturer
Tongwei TWMHF-66HD735X vs Tongwei TWMNF-66HD750
7 differences, the largest is temperature coefficient
Same manufacturer
Tongwei TWMHF-66HD735X vs Tongwei TWMNF-66HD745
7 differences, the largest is temperature coefficient
06

Written summary

07

Questions about this pairing

Which panel is better: Tongwei TWMHF-66HD735X or Tongwei TWMHF-66HD720X?
According to our database: Tongwei TWMHF-66HD735X has higher module efficiency (23.70% vs 23.20%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TWMHF-66HD735X and Tongwei TWMHF-66HD720X?
Tongwei TWMHF-66HD735X has a module efficiency of 23.70%, while Tongwei TWMHF-66HD720X is 23.20%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei TWMHF-66HD735X use vs Tongwei TWMHF-66HD720X?
Tongwei TWMHF-66HD735X uses N-type cells; Tongwei TWMHF-66HD720X 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 TWMHF-66HD735X and Tongwei TWMHF-66HD720X?
Tongwei TWMHF-66HD735X has a 30 years power warranty; Tongwei TWMHF-66HD720X 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 TWMHF-66HD735X and Tongwei TWMHF-66HD720X bifacial panels?
Both Tongwei TWMHF-66HD735X and Tongwei TWMHF-66HD720X 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.