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TWMNH-66HD640 vs TWMHF-66HD730X 10 of 19 identical Swap Change panels

Tongwei TWMNH-66HD640 vs Tongwei TWMHF-66HD730X

Tongwei TWMNH-66HD640
TWMNH-66HD640
640 Wp 23.70 % N-type Bifacial
Open panel page Datasheet PDF
VS
TWMHF-66HD730X
730 Wp 23.50 % N-type Bifacial
Open panel page Datasheet PDF
The verdict

TWMHF-66HD730X leads on the differences that matter

The largest is temperature coefficient: 0.040 %/°C better in heat. 10 of 19 comparable parameters are identical.

See all 9 differences
How alike are they
10 of 19 comparable
parameters are identical
identical differs
01

What actually differs

9 of 19 parameters
Parameter TWMNH-66HD640 TWMHF-66HD730X Difference
Temperature coefficient -0.280 %/°C -0.240 %/°C 0.040 %/°C better in heat
Rated power 640 Wp 730 Wp 90 W more power
Weight 32.2 kg 37.0 kg 4.8 kg lighter
Product warranty 12 yrs 15 yrs 3 yrs longer
Module area 2.701 m² 3.106 m² 0.405 m² apart
Short-circuit current 16.33 A 18.28 A 1.95 A apart
Module efficiency 23.70 % 23.50 % 0.20 pp more efficient
Current at max power 15.47 A 17.33 A 1.86 A apart
Dimensions 2382x1134x30 mm 2384x1303x33 mm 2382x1134x30 mm vs 2384x1303x33 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
TWMNH-66HD640
21,473 kWh
TWMHF-66HD730X
24,588 kWh
Lifetime gap
3,115 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario TWMNH-66HD640 TWMHF-66HD730X
Standard test conditions 25 °C 100.0% of rated power 640 W 730 W
Cool, bright day 40 °C 95.8% of rated power 613 W 704 W
Typical summer roof 55 °C 91.6% of rated power 586 W 677 W
Hot roof 70 °C 87.4% of rated power 559 W 651 W
03

Full specification

Parameter TWMNH-66HD640 TWMHF-66HD730X Difference
Power and efficiency
Rated power 640 Wp 730 Wp +90 W for TWMHF-66HD730X
Module efficiency 23.70 % 23.50 % +0.20 pp for TWMNH-66HD640
Power density 236.9 Wp/m² 235.0 Wp/m² Effectively the same
Open-circuit voltage 49.75 V 50.46 V Effectively the same
Voltage at max power 41.38 V 42.13 V Effectively the same
Short-circuit current 16.33 A 18.28 A 1.95 A apart
Current at max power 15.47 A 17.33 A 1.86 A apart
Temperature
Temperature coefficient -0.280 %/°C -0.240 %/°C +0.040 %/°C for TWMHF-66HD730X
Mechanical
Dimensions 2382x1134x30 mm 2384x1303x33 mm 2382x1134x30 mm vs 2384x1303x33 mm
Module area 2.701 m² 3.106 m² 0.405 m² apart
Weight 32.2 kg 37.0 kg -4.8 kg for TWMNH-66HD640
Weight per kWp 50.3 kg/kWp 50.7 kg/kWp Effectively the same
Warranty and degradation
Product warranty 12 yrs 15 yrs +3 yrs for TWMHF-66HD730X
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.38 %/yr Effectively the 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 #716
TWMNH-66HD640 leads by 199 places
Power density
#521 vs #800
TWMNH-66HD640 leads by 279 places
Heat behaviour
#1,309 vs #13
TWMHF-66HD730X leads by 1,296 places
Weight
#3,712 vs #4,111
TWMNH-66HD640 leads by 399 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,525 vs #196
TWMHF-66HD730X leads by 1,329 places
05

More useful comparisons

Open the full database
Same series, other bin
Tongwei TWMNH-66HD640 vs Tongwei TWMNF-66HD750
9 differences, the largest is rated power
Same series, other bin
Tongwei TWMNH-66HD640 vs Tongwei TWMNF-66HD745
8 differences, the largest is rated power
Same series, other bin
Tongwei TWMNH-66HD640 vs Tongwei TWMNF-66HD740
7 differences, the largest is rated power
Same series, other bin
Tongwei TWMNH-66HD640 vs Tongwei TWMHF-66HD740X
8 differences, the largest is temperature coefficient
Same series, other bin
Tongwei TWMNH-66HD640 vs Tongwei TWMNF-66HD735
7 differences, the largest is rated power
Same series, other bin
Tongwei TWMNH-66HD640 vs Tongwei TWMHF-66HD735X
8 differences, the largest is temperature coefficient
06

Written summary

07

Questions about this pairing

Which panel is better: Tongwei TWMNH-66HD640 or Tongwei TWMHF-66HD730X?
According to our database: Tongwei TWMNH-66HD640 has higher module efficiency (23.70% vs 23.50%); Tongwei TWMHF-66HD730X tolerates heat better (temp coeff -0.240%/°C vs -0.280%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TWMNH-66HD640 and Tongwei TWMHF-66HD730X?
Tongwei TWMNH-66HD640 has a module efficiency of 23.70%, while Tongwei TWMHF-66HD730X is 23.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei TWMNH-66HD640 use vs Tongwei TWMHF-66HD730X?
Tongwei TWMNH-66HD640 uses N-type cells; Tongwei TWMHF-66HD730X 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 TWMNH-66HD640 and Tongwei TWMHF-66HD730X?
Tongwei TWMNH-66HD640 has a 30 years power warranty; Tongwei TWMHF-66HD730X 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 TWMNH-66HD640 and Tongwei TWMHF-66HD730X bifacial panels?
Both Tongwei TWMNH-66HD640 and Tongwei TWMHF-66HD730X 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.