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LR7-72HVHF-645M vs DHN-78X16/DG-640W 4 of 18 identical Swap Change panels

Longi Solar LR7-72HVHF-645M vs DAH Solar DHN-78X16/DG-640W

Longi Solar LR7-72HVHF-645M
LR7-72HVHF-645M
645 Wp 23.90 % N-type
Open panel page Datasheet PDF
VS
DAH Solar
DHN-78X16/DG-640W
640 Wp 22.90 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

LR7-72HVHF-645M leads on the differences that matter

The largest is module efficiency: 1.00 pp more efficient. 4 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 14 differences
How alike are they
4 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

14 of 18 parameters
Parameter LR7-72HVHF-645M DHN-78X16/DG-640W Difference
Module efficiency 23.90 % 22.90 % 1.00 pp more efficient
Temperature coefficient -0.260 %/°C -0.290 %/°C 0.030 %/°C better in heat
Power density 238.8 Wp/m² 229.0 Wp/m² 9.8 Wp/m² higher
Weight 28.5 kg 34.2 kg 5.7 kg lighter
Weight per kWp 44.2 kg/kWp 53.4 kg/kWp 9.3 kg/kWp lighter
Module area 2.701 m² 2.795 m² 0.094 m² apart
Open-circuit voltage 53.80 V 56.40 V 2.60 V apart
Cell technology N-type TOPCon N-type vs TOPCon
Cell count 144 156 12 cells apart
Short-circuit current 15.21 A 14.32 A 0.89 A apart
Voltage at max power 44.46 V 47.60 V 3.14 V apart
Bifacial No Yes No vs Yes
Current at max power 14.51 A 13.45 A 1.06 A apart
Dimensions 2382x1134x30 mm 2465x1134x34 mm 2382x1134x30 mm vs 2465x1134x34 mm
02

What it means on a roof

Thirty years of production
A 1.0% first-year loss then 0.40% a year, assumed for both panels, at 1,200 kWh/kWp a year
LR7-72HVHF-645M
21,641 kWh
DHN-78X16/DG-640W
21,473 kWh
Lifetime gap
168 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario LR7-72HVHF-645M DHN-78X16/DG-640W
Standard test conditions 25 °C 100.0% of rated power 645 W 640 W
Cool, bright day 40 °C 95.7% of rated power 620 W 612 W
Typical summer roof 55 °C 91.3% of rated power 595 W 584 W
Hot roof 70 °C 87.0% of rated power 570 W 556 W
03

Full specification

Parameter LR7-72HVHF-645M DHN-78X16/DG-640W Difference
Power and efficiency
Rated power 645 Wp 640 Wp Effectively the same
Module efficiency 23.90 % 22.90 % +1.00 pp for LR7-72HVHF-645M
Power density 238.8 Wp/m² 229.0 Wp/m² +9.8 Wp/m² for LR7-72HVHF-645M
Open-circuit voltage 53.80 V 56.40 V 2.60 V apart
Voltage at max power 44.46 V 47.60 V 3.14 V apart
Short-circuit current 15.21 A 14.32 A 0.89 A apart
Current at max power 14.51 A 13.45 A 1.06 A apart
Temperature
Temperature coefficient -0.260 %/°C -0.290 %/°C +0.030 %/°C for LR7-72HVHF-645M
Mechanical
Dimensions 2382x1134x30 mm 2465x1134x34 mm 2382x1134x30 mm vs 2465x1134x34 mm
Module area 2.701 m² 2.795 m² 0.094 m² apart
Weight 28.5 kg 34.2 kg -5.7 kg for LR7-72HVHF-645M
Weight per kWp 44.2 kg/kWp 53.4 kg/kWp -9.3 kg/kWp for LR7-72HVHF-645M
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.35 %/yr - Not published by DAH Solar
Technology
Cell technology N-type TOPCon N-type vs TOPCon
Cell type Monocrystalline Monocrystalline Same
Cell count 144 156 12 cells apart
Bifacial No Yes No vs Yes
04

Against the whole database

14,129 panels
Efficiency
#378 vs #2,412
LR7-72HVHF-645M leads by 2,034 places
Power density
#383 vs #2,443
LR7-72HVHF-645M leads by 2,060 places
Heat behaviour
#515 vs #2,220
LR7-72HVHF-645M leads by 1,705 places
Weight
#388 vs #7,431
LR7-72HVHF-645M leads by 7,043 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,016 vs #1,725
LR7-72HVHF-645M leads by 709 places
05

More useful comparisons

Open the full database
Same series, other bin
Longi Solar LR7-72HVHF-645M vs Longi Solar LR7-72HVHF-670M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-72HVHF-645M vs Longi Solar LR7-72HVHF-665M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-72HVHF-645M vs Longi Solar LR7-72HVHF-660M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-72HVHF-645M vs Longi Solar LR7-72HVHF-655M
3 differences, the largest is module efficiency
Same series, other bin
Longi Solar LR7-72HVHF-645M vs Longi Solar LR7-72HVHF-650M
One difference: module efficiency
Same series, other bin
Longi Solar LR7-72HVHF-645M vs Longi Solar LR7-72HVHF-640M
One difference: module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: Longi Solar LR7-72HVHF-645M or DAH Solar DHN-78X16/DG-640W?
According to our database: Longi Solar LR7-72HVHF-645M has higher module efficiency (23.90% vs 22.90%); Longi Solar LR7-72HVHF-645M tolerates heat better (temp coeff -0.260%/°C vs -0.290%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Longi Solar LR7-72HVHF-645M and DAH Solar DHN-78X16/DG-640W?
Longi Solar LR7-72HVHF-645M has a module efficiency of 23.90%, while DAH Solar DHN-78X16/DG-640 W is 22.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Longi Solar LR7-72HVHF-645M use vs DAH Solar DHN-78X16/DG-640W?
Longi Solar LR7-72HVHF-645M uses N-type cells; DAH Solar DHN-78X16/DG-640 W uses TOPCon. 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 Longi Solar LR7-72HVHF-645M and DAH Solar DHN-78X16/DG-640W?
Longi Solar LR7-72HVHF-645M has a 30 years power warranty; DAH Solar DHN-78X16/DG-640 W 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 Longi Solar LR7-72HVHF-645M and DAH Solar DHN-78X16/DG-640W bifacial panels?
DAH Solar DHN-78X16/DG-640 W is bifacial (captures light from both faces); Longi Solar LR7-72HVHF-645M is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
Compare Longi Solar and DAH Solar as manufacturers Portfolio, efficiency, cell technologies and warranty terms

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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.