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TWMHF-66HD735X vs TWMNH-66HD640 11 of 19 identical Swap Change panels

Tongwei TWMHF-66HD735X vs Tongwei TWMNH-66HD640

TWMHF-66HD735X
735 Wp 23.70 % N-type Bifacial
Open panel page Datasheet PDF
VS
Tongwei TWMNH-66HD640
TWMNH-66HD640
640 Wp 23.70 % N-type Bifacial
Open panel page Datasheet PDF
The verdict

TWMHF-66HD735X leads on the differences that matter

The largest is temperature coefficient: 0.040 %/°C better in heat. 11 of 19 comparable parameters are identical.

See all 8 differences
How alike are they
11 of 19 comparable
parameters are identical
identical differs
01

What actually differs

8 of 19 parameters
Parameter TWMHF-66HD735X TWMNH-66HD640 Difference
Temperature coefficient -0.240 %/°C -0.280 %/°C 0.040 %/°C better in heat
Rated power 735 Wp 640 Wp 95 W more power
Weight 37.0 kg 32.2 kg 4.8 kg lighter
Product warranty 15 yrs 12 yrs 3 yrs longer
Short-circuit current 18.37 A 16.33 A 2.04 A apart
Module area 3.106 m² 2.701 m² 0.405 m² apart
Current at max power 17.41 A 15.47 A 1.94 A apart
Dimensions 2384x1303x33 mm 2382x1134x30 mm 2384x1303x33 mm vs 2382x1134x30 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
TWMHF-66HD735X
24,757 kWh
TWMNH-66HD640
21,473 kWh
Lifetime gap
3,284 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario TWMHF-66HD735X TWMNH-66HD640
Standard test conditions 25 °C 100.0% of rated power 735 W 640 W
Cool, bright day 40 °C 95.8% of rated power 709 W 613 W
Typical summer roof 55 °C 91.6% of rated power 682 W 586 W
Hot roof 70 °C 87.4% of rated power 656 W 559 W
03

Full specification

Parameter TWMHF-66HD735X TWMNH-66HD640 Difference
Power and efficiency
Rated power 735 Wp 640 Wp +95 W for TWMHF-66HD735X
Module efficiency 23.70 % 23.70 % Same
Power density 236.6 Wp/m² 236.9 Wp/m² Effectively the same
Open-circuit voltage 50.54 V 49.75 V Effectively the same
Voltage at max power 42.22 V 41.38 V Effectively the same
Short-circuit current 18.37 A 16.33 A 2.04 A apart
Current at max power 17.41 A 15.47 A 1.94 A apart
Temperature
Temperature coefficient -0.240 %/°C -0.280 %/°C +0.040 %/°C for TWMHF-66HD735X
Mechanical
Dimensions 2384x1303x33 mm 2382x1134x30 mm 2384x1303x33 mm vs 2382x1134x30 mm
Module area 3.106 m² 2.701 m² 0.405 m² apart
Weight 37.0 kg 32.2 kg -4.8 kg for TWMNH-66HD640
Weight per kWp 50.3 kg/kWp 50.3 kg/kWp Same
Warranty and degradation
Product warranty 15 yrs 12 yrs +3 yrs for TWMHF-66HD735X
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.38 %/yr 0.40 %/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 #517
Tied - the same position in the database
Power density
#582 vs #521
TWMNH-66HD640 leads by 61 places
Heat behaviour
#13 vs #1,309
TWMHF-66HD735X leads by 1,296 places
Weight
#3,719 vs #3,712
TWMNH-66HD640 leads by 7 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#155 vs #1,525
TWMHF-66HD735X leads by 1,370 places
05

More useful comparisons

Open the full database
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Tongwei TWMHF-66HD735X vs Tongwei TWMHF-66HD740X
The same specification on paper
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Tongwei TWMHF-66HD735X vs Tongwei TWMHF-66HD730X
One difference: module efficiency
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Tongwei TWMHF-66HD735X vs Tongwei TWMHF-66HD725X
3 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMHF-66HD735X vs Tongwei TWMHF-66HD720X
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 series, other bin
Tongwei TWMNH-66HD640 vs Tongwei TWMNF-66HD750
9 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Tongwei TWMHF-66HD735X or Tongwei TWMNH-66HD640?
According to our database: Tongwei TWMHF-66HD735X 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 TWMHF-66HD735X and Tongwei TWMNH-66HD640?
Tongwei TWMHF-66HD735X has a module efficiency of 23.70%, while Tongwei TWMNH-66HD640 is 23.70%. 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 TWMNH-66HD640?
Tongwei TWMHF-66HD735X uses N-type cells; Tongwei TWMNH-66HD640 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 TWMNH-66HD640?
Tongwei TWMHF-66HD735X has a 30 years power warranty; Tongwei TWMNH-66HD640 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 TWMNH-66HD640 bifacial panels?
Both Tongwei TWMHF-66HD735X and Tongwei TWMNH-66HD640 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.