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TWMNF-66HD740 vs TWMND-72HD590 6 of 19 identical Swap Change panels

Tongwei TWMNF-66HD740 vs Tongwei TWMND-72HD590

Tongwei TWMNF-66HD740
TWMNF-66HD740
740 Wp 23.80 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
TWMND-72HD590
590 Wp 22.80 % N-type Bifacial
Open panel page Datasheet PDF
The verdict

TWMNF-66HD740 leads on the differences that matter

The largest is module efficiency: 1.00 pp more efficient. 6 of 19 comparable parameters are identical.

See all 13 differences
How alike are they
6 of 19 comparable
parameters are identical
identical differs
01

What actually differs

13 of 19 parameters
Parameter TWMNF-66HD740 TWMND-72HD590 Difference
Module efficiency 23.80 % 22.80 % 1.00 pp more efficient
Rated power 740 Wp 590 Wp 150 W more power
Power density 238.2 Wp/m² 228.4 Wp/m² 9.8 Wp/m² higher
Weight 37.3 kg 31.5 kg 5.8 kg lighter
Short-circuit current 18.81 A 13.95 A 4.86 A apart
Module area 3.106 m² 2.583 m² 0.523 m² apart
Open-circuit voltage 49.80 V 52.70 V 2.90 V apart
Cell technology TOPCon N-type TOPCon vs N-type
Weight per kWp 50.4 kg/kWp 53.4 kg/kWp 3.0 kg/kWp lighter
Current at max power 17.75 A 13.33 A 4.42 A apart
Cell count 132 144 12 cells apart
Voltage at max power 41.69 V 44.27 V 2.58 V apart
Dimensions 2384x1303x33 mm 2278x1134x30 mm 2384x1303x33 mm vs 2278x1134x30 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-66HD740
24,828 kWh
TWMND-72HD590
19,796 kWh
Lifetime gap
5,032 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario TWMNF-66HD740 TWMND-72HD590
Standard test conditions 25 °C 100.0% of rated power 740 W 590 W
Cool, bright day 40 °C 95.8% of rated power 709 W 565 W
Typical summer roof 55 °C 91.6% of rated power 678 W 540 W
Hot roof 70 °C 87.4% of rated power 647 W 516 W
03

Full specification

Parameter TWMNF-66HD740 TWMND-72HD590 Difference
Power and efficiency
Rated power 740 Wp 590 Wp +150 W for TWMNF-66HD740
Module efficiency 23.80 % 22.80 % +1.00 pp for TWMNF-66HD740
Power density 238.2 Wp/m² 228.4 Wp/m² +9.8 Wp/m² for TWMNF-66HD740
Open-circuit voltage 49.80 V 52.70 V 2.90 V apart
Voltage at max power 41.69 V 44.27 V 2.58 V apart
Short-circuit current 18.81 A 13.95 A 4.86 A apart
Current at max power 17.75 A 13.33 A 4.42 A apart
Temperature
Temperature coefficient -0.280 %/°C -0.280 %/°C Same
Mechanical
Dimensions 2384x1303x33 mm 2278x1134x30 mm 2384x1303x33 mm vs 2278x1134x30 mm
Module area 3.106 m² 2.583 m² 0.523 m² apart
Weight 37.3 kg 31.5 kg -5.8 kg for TWMND-72HD590
Weight per kWp 50.4 kg/kWp 53.4 kg/kWp -3.0 kg/kWp for TWMNF-66HD740
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 132 144 12 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#462 vs #2,769
TWMNF-66HD740 leads by 2,307 places
Power density
#460 vs #2,653
TWMNF-66HD740 leads by 2,193 places
Heat behaviour
#1,347 vs #1,347
Tied - the same position in the database
Weight
#3,801 vs #7,361
TWMNF-66HD740 leads by 3,560 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#183 vs #3,836
TWMNF-66HD740 leads by 3,653 places
05

More useful comparisons

Open the full database
Same series, other bin
Tongwei TWMNF-66HD740 vs Tongwei TWMNF-66HD750
3 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMNF-66HD740 vs Tongwei TWMNF-66HD745
One difference: module efficiency
Same series, other bin
Tongwei TWMNF-66HD740 vs Tongwei TWMNF-66HD735
The same specification on paper
Same series, other bin
Tongwei TWMNF-66HD740 vs Tongwei TWMNF-66HD730
3 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMND-72HD590 vs Tongwei TWMND-72HD600
3 differences, the largest is module efficiency
Same series, other bin
Tongwei TWMND-72HD590 vs Tongwei TWMND-72HD595
One difference: module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Tongwei TWMNF-66HD740 or Tongwei TWMND-72HD590?
According to our database: Tongwei TWMNF-66HD740 has higher module efficiency (23.80% vs 22.80%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Tongwei TWMNF-66HD740 and Tongwei TWMND-72HD590?
Tongwei TWMNF-66HD740 has a module efficiency of 23.80%, while Tongwei TWMND-72HD590 is 22.80%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Tongwei TWMNF-66HD740 use vs Tongwei TWMND-72HD590?
Tongwei TWMNF-66HD740 uses TOPCon cells; Tongwei TWMND-72HD590 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-66HD740 and Tongwei TWMND-72HD590?
Tongwei TWMNF-66HD740 has a 30 years power warranty; Tongwei TWMND-72HD590 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-66HD740 and Tongwei TWMND-72HD590 bifacial panels?
Both Tongwei TWMNF-66HD740 and Tongwei TWMND-72HD590 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.