66HD720 vs 66HD730 16 of 19 identical Swap Change panels

Tongwei TWMNF-66HD720 vs Tongwei TWMNF-66HD730

Q: Which panel is better: Tongwei TWMNF-66HD720 or Tongwei TWMNF-66HD730?

According to our database: Tongwei TWMNF-66HD730 has higher module efficiency (23.50% vs 23.20%). See the full spec comparison and 30-year energy simulation above for a complete picture.

Q: What is the efficiency of Tongwei TWMNF-66HD720 and Tongwei TWMNF-66HD730?

Tongwei TWMNF-66HD720 has a module efficiency of 23.20%, while Tongwei TWMNF-66HD730 is 23.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does Tongwei TWMNF-66HD720 use vs Tongwei TWMNF-66HD730?

Tongwei TWMNF-66HD720 uses TOPCon cells; Tongwei TWMNF-66HD730 uses TOPCon. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.

Q: What is the warranty on Tongwei TWMNF-66HD720 and Tongwei TWMNF-66HD730?

Tongwei TWMNF-66HD720 has a 30 years power warranty; Tongwei TWMNF-66HD730 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.

Q: Are Tongwei TWMNF-66HD720 and Tongwei TWMNF-66HD730 bifacial panels?

Both Tongwei TWMNF-66HD720 and Tongwei TWMNF-66HD730 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.

TWMNF-66HD720

720 Wp 23.20 % TOPCon Bifacial

Open panel page Datasheet PDF

TWMNF-66HD730

730 Wp 23.50 % TOPCon Bifacial

Open panel page Datasheet PDF

The verdict

66HD730 leads on the differences that matter

The largest is module efficiency: 0.30 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

What actually differs

3 of 19 parameters

Parameter 66HD720 66HD730 Difference

Module efficiency 23.20 % 23.50 % 0.30 pp more efficient

Power density 231.8 Wp/m² 235.0 Wp/m² 3.2 Wp/m² higher

Rated power 720 Wp 730 Wp 10 W more power

What it means on a roof

Thirty years of production

Each panel's own declared degradation curve, at 1,200 kWh/kWp a year

Cell temperature

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.

66HD720

24,157 kWh

66HD730

24,493 kWh

Lifetime gap

336 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario 66HD720 66HD730

Standard test conditions 25 °C 100.0% of rated power 720 W 730 W

Cool, bright day 40 °C 95.8% of rated power 690 W 699 W

Typical summer roof 55 °C 91.6% of rated power 660 W 669 W

Hot roof 70 °C 87.4% of rated power 629 W 638 W

Full specification

Parameter 66HD720 66HD730 Difference

Power and efficiency

Rated power 720 Wp 730 Wp +10 W for 66HD730

Module efficiency 23.20 % 23.50 % +0.30 pp for 66HD730

Power density 231.8 Wp/m² 235.0 Wp/m² +3.2 Wp/m² for 66HD730

Open-circuit voltage 49.28 V 49.55 V Effectively the same

Voltage at max power 41.03 V 41.37 V Effectively the same

Short-circuit current 18.55 A 18.68 A Effectively the same

Current at max power 17.55 A 17.65 A Effectively the 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 37.3 kg Effectively the same

Weight per kWp 52.6 kg/kWp 51.1 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 132 132 Same

Bifacial Yes Yes Same

Against the whole database

14,005 panels

Efficiency

#1,306 vs #716

66HD730 leads by 590 places

Power density

#1,347 vs #800

66HD730 leads by 547 places

Heat behaviour

#1,309 vs #1,309

Tied - the same position in the database

Weight

#6,266 vs #4,435

66HD730 leads by 1,831 places

Warranty

#21 vs #21

Tied - the same position in the database

Overall

#516 vs #302

66HD730 leads by 214 places

More useful comparisons

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Tongwei TWMNF-66HD720 vs Tongwei TWMNF-66HD740

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Tongwei TWMNF-66HD720 vs Tongwei THC G12-66 Bifacial

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Tongwei TWMNF-66HD720 vs Tongwei TWMNF-66HD735

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Tongwei TWMNF-66HD720 vs Tongwei TWMNF-66HD725

The same specification on paper

Written summary

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Questions about this pairing

Which panel is better: Tongwei TWMNF-66HD720 or Tongwei TWMNF-66HD730?

According to our database: Tongwei TWMNF-66HD730 has higher module efficiency (23.50% vs 23.20%). See the full spec comparison and 30-year energy simulation above for a complete picture.

What is the efficiency of Tongwei TWMNF-66HD720 and Tongwei TWMNF-66HD730?

Tongwei TWMNF-66HD720 has a module efficiency of 23.20%, while Tongwei TWMNF-66HD730 is 23.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

What cell technology does Tongwei TWMNF-66HD720 use vs Tongwei TWMNF-66HD730?

Tongwei TWMNF-66HD720 uses TOPCon cells; Tongwei TWMNF-66HD730 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-66HD720 and Tongwei TWMNF-66HD730?

Tongwei TWMNF-66HD720 has a 30 years power warranty; Tongwei TWMNF-66HD730 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-66HD720 and Tongwei TWMNF-66HD730 bifacial panels?

Both Tongwei TWMNF-66HD720 and Tongwei TWMNF-66HD730 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.

Shop prices: See 71 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.