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66HD725X vs 66HD735X 16 of 19 identical Swap Change panels

Tongwei TWMHF-66HD725X vs Tongwei TWMHF-66HD735X

TWMHF-66HD725X
725 Wp 23.30 % N-type Bifacial
Open panel page Datasheet PDF
VS
TWMHF-66HD735X
735 Wp 23.70 % N-type Bifacial
Open panel page Datasheet PDF
The verdict

66HD735X leads on the differences that matter

The largest is module efficiency: 0.40 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 66HD725X 66HD735X Difference
Module efficiency 23.30 % 23.70 % 0.40 pp more efficient
Power density 233.4 Wp/m² 236.6 Wp/m² 3.2 Wp/m² higher
Rated power 725 Wp 735 Wp 10 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.
66HD725X
24,420 kWh
66HD735X
24,757 kWh
Lifetime gap
337 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 66HD725X 66HD735X
Standard test conditions 25 °C 100.0% of rated power 725 W 735 W
Cool, bright day 40 °C 96.4% of rated power 699 W 709 W
Typical summer roof 55 °C 92.8% of rated power 673 W 682 W
Hot roof 70 °C 89.2% of rated power 647 W 656 W
03

Full specification

Parameter 66HD725X 66HD735X Difference
Power and efficiency
Rated power 725 Wp 735 Wp +10 W for 66HD735X
Module efficiency 23.30 % 23.70 % +0.40 pp for 66HD735X
Power density 233.4 Wp/m² 236.6 Wp/m² +3.2 Wp/m² for 66HD735X
Open-circuit voltage 50.38 V 50.54 V Effectively the same
Voltage at max power 42.03 V 42.22 V Effectively the same
Short-circuit current 18.18 A 18.37 A Effectively the same
Current at max power 17.25 A 17.41 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 51.0 kg/kWp 50.3 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
#1,017 vs #517
66HD735X leads by 500 places
Power density
#936 vs #582
66HD735X leads by 354 places
Heat behaviour
#13 vs #13
Tied - the same position in the database
Weight
#4,382 vs #3,719
66HD735X leads by 663 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#263 vs #155
66HD735X leads by 108 places
05

More useful comparisons

Open the full database
Same series, other bin
Tongwei TWMHF-66HD725X vs Tongwei TWMHF-66HD740X
3 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMHF-66HD725X vs Tongwei TWMHF-66HD730X
One difference: module efficiency
Same series, other bin
Tongwei TWMHF-66HD725X vs Tongwei TWMHF-66HD720X
The same specification on paper
Same series, other bin
Tongwei TWMHF-66HD725X vs Tongwei TWMHF-66HD715X
3 differences, the largest is module efficiency
Same manufacturer
Tongwei TWMHF-66HD725X vs Tongwei TWMNF-66HD750
8 differences, the largest is module efficiency
Same manufacturer
Tongwei TWMHF-66HD725X vs Tongwei TWMNF-66HD745
8 differences, the largest is temperature coefficient
06

Written summary

07

Questions about this pairing

Which panel is better: Tongwei TWMHF-66HD725X or Tongwei TWMHF-66HD735X?
According to our database: Tongwei TWMHF-66HD735X has higher module efficiency (23.70% vs 23.30%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TWMHF-66HD725X and Tongwei TWMHF-66HD735X?
Tongwei TWMHF-66HD725X has a module efficiency of 23.30%, while Tongwei TWMHF-66HD735X is 23.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei TWMHF-66HD725X use vs Tongwei TWMHF-66HD735X?
Tongwei TWMHF-66HD725X uses N-type cells; Tongwei TWMHF-66HD735X 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-66HD725X and Tongwei TWMHF-66HD735X?
Tongwei TWMHF-66HD725X has a 30 years power warranty; Tongwei TWMHF-66HD735X 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-66HD725X and Tongwei TWMHF-66HD735X bifacial panels?
Both Tongwei TWMHF-66HD725X and Tongwei TWMHF-66HD735X 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.