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TWMNF-66HD750 vs TWMNH-66HD645 11 of 19 identical Swap Change panels

Tongwei TWMNF-66HD750 vs Tongwei TWMNH-66HD645

Tongwei TWMNF-66HD750
TWMNF-66HD750
750 Wp 24.10 % TOPCon 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

TWMNF-66HD750 leads on the differences that matter

The largest is rated power: 105 W more power. 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 TWMNF-66HD750 TWMNH-66HD645 Difference
Rated power 750 Wp 645 Wp 105 W more power
Weight 37.3 kg 32.2 kg 5.1 kg lighter
Short-circuit current 18.93 A 16.39 A 2.54 A apart
Module area 3.106 m² 2.701 m² 0.405 m² apart
Module efficiency 24.10 % 23.90 % 0.20 pp more efficient
Cell technology TOPCon N-type TOPCon vs N-type
Current at max power 17.85 A 15.54 A 2.31 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
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.
TWMNF-66HD750
25,164 kWh
TWMNH-66HD645
21,641 kWh
Lifetime gap
3,523 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario TWMNF-66HD750 TWMNH-66HD645
Standard test conditions 25 °C 100.0% of rated power 750 W 645 W
Cool, bright day 40 °C 95.8% of rated power 719 W 618 W
Typical summer roof 55 °C 91.6% of rated power 687 W 591 W
Hot roof 70 °C 87.4% of rated power 656 W 564 W
03

Full specification

Parameter TWMNF-66HD750 TWMNH-66HD645 Difference
Power and efficiency
Rated power 750 Wp 645 Wp +105 W for TWMNF-66HD750
Module efficiency 24.10 % 23.90 % +0.20 pp for TWMNF-66HD750
Power density 241.4 Wp/m² 238.8 Wp/m² Effectively the same
Open-circuit voltage 50.10 V 49.85 V Effectively the same
Voltage at max power 42.02 V 41.51 V Effectively the same
Short-circuit current 18.93 A 16.39 A 2.54 A apart
Current at max power 17.85 A 15.54 A 2.31 A apart
Temperature
Temperature coefficient -0.280 %/°C -0.280 %/°C Same
Mechanical
Dimensions 2384x1303x33 mm 2382x1134x30 mm 2384x1303x33 mm vs 2382x1134x30 mm
Module area 3.106 m² 2.701 m² 0.405 m² apart
Weight 37.3 kg 32.2 kg -5.1 kg for TWMNH-66HD645
Weight per kWp 49.7 kg/kWp 49.9 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 N-type TOPCon vs N-type
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#219 vs #351
TWMNF-66HD750 leads by 132 places
Power density
#219 vs #356
TWMNF-66HD750 leads by 137 places
Heat behaviour
#1,309 vs #1,309
Tied - the same position in the database
Weight
#3,210 vs #3,293
TWMNF-66HD750 leads by 83 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#122 vs #1,342
TWMNF-66HD750 leads by 1,220 places
05

More useful comparisons

Open the full database
Same series, other bin
Tongwei TWMNF-66HD750 vs Tongwei TWMNF-66HD745
The same specification on paper
Same series, other bin
Tongwei TWMNF-66HD750 vs Tongwei TWMNF-66HD740
3 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMNF-66HD750 vs Tongwei TWMNF-66HD735
3 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMNF-66HD750 vs Tongwei TWMNF-66HD730
3 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMNH-66HD645 vs Tongwei TWMHF-66HD740X
8 differences, the largest is temperature coefficient
Same series, other bin
Tongwei TWMNH-66HD645 vs Tongwei TWMHF-66HD735X
9 differences, the largest is temperature coefficient
06

Written summary

07

Questions about this pairing

Which panel is better: Tongwei TWMNF-66HD750 or Tongwei TWMNH-66HD645?
According to our database: Tongwei TWMNF-66HD750 has higher module efficiency (24.10% vs 23.90%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TWMNF-66HD750 and Tongwei TWMNH-66HD645?
Tongwei TWMNF-66HD750 has a module efficiency of 24.10%, 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 TWMNF-66HD750 use vs Tongwei TWMNH-66HD645?
Tongwei TWMNF-66HD750 uses TOPCon 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 TWMNF-66HD750 and Tongwei TWMNH-66HD645?
Tongwei TWMNF-66HD750 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 TWMNF-66HD750 and Tongwei TWMNH-66HD645 bifacial panels?
Both Tongwei TWMNF-66HD750 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.