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TWMHF-66HD735X vs TWMNH-66HD645 10 of 19 identical Swap Change panels

Tongwei TWMHF-66HD735X vs Tongwei TWMNH-66HD645

TWMHF-66HD735X
735 Wp 23.70 % N-type Bifacial
Open panel page Datasheet PDF
VS
Tongwei TWMNH-66HD645
TWMNH-66HD645
645 Wp 23.90 % 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. 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 TWMHF-66HD735X TWMNH-66HD645 Difference
Temperature coefficient -0.240 %/°C -0.280 %/°C 0.040 %/°C better in heat
Rated power 735 Wp 645 Wp 90 W more power
Weight 37.0 kg 32.2 kg 4.8 kg lighter
Product warranty 15 yrs 12 yrs 3 yrs longer
Module area 3.106 m² 2.701 m² 0.405 m² apart
Short-circuit current 18.37 A 16.39 A 1.98 A apart
Module efficiency 23.70 % 23.90 % 0.20 pp more efficient
Current at max power 17.41 A 15.54 A 1.87 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-66HD645
21,641 kWh
Lifetime gap
3,116 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario TWMHF-66HD735X TWMNH-66HD645
Standard test conditions 25 °C 100.0% of rated power 735 W 645 W
Cool, bright day 40 °C 95.8% of rated power 709 W 618 W
Typical summer roof 55 °C 91.6% of rated power 682 W 591 W
Hot roof 70 °C 87.4% of rated power 656 W 564 W
03

Full specification

Parameter TWMHF-66HD735X TWMNH-66HD645 Difference
Power and efficiency
Rated power 735 Wp 645 Wp +90 W for TWMHF-66HD735X
Module efficiency 23.70 % 23.90 % +0.20 pp for TWMNH-66HD645
Power density 236.6 Wp/m² 238.8 Wp/m² Effectively the same
Open-circuit voltage 50.54 V 49.85 V Effectively the same
Voltage at max power 42.22 V 41.51 V Effectively the same
Short-circuit current 18.37 A 16.39 A 1.98 A apart
Current at max power 17.41 A 15.54 A 1.87 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-66HD645
Weight per kWp 50.3 kg/kWp 49.9 kg/kWp Effectively the 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 #351
TWMNH-66HD645 leads by 166 places
Power density
#582 vs #356
TWMNH-66HD645 leads by 226 places
Heat behaviour
#13 vs #1,309
TWMHF-66HD735X leads by 1,296 places
Weight
#3,719 vs #3,293
TWMNH-66HD645 leads by 426 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#155 vs #1,342
TWMHF-66HD735X leads by 1,187 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-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-66HD645 vs Tongwei TWMNF-66HD750
8 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: Tongwei TWMHF-66HD735X or Tongwei TWMNH-66HD645?
According to our database: Tongwei TWMNH-66HD645 has higher module efficiency (23.90% vs 23.70%); 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-66HD645?
Tongwei TWMHF-66HD735X has a module efficiency of 23.70%, while Tongwei TWMNH-66HD645 is 23.90%. 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-66HD645?
Tongwei TWMHF-66HD735X uses N-type cells; Tongwei TWMNH-66HD645 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-66HD645?
Tongwei TWMHF-66HD735X has a 30 years power warranty; Tongwei TWMNH-66HD645 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-66HD645 bifacial panels?
Both Tongwei TWMHF-66HD735X and Tongwei TWMNH-66HD645 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.