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

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

DAH Solar
DHN-78X16/DG-640W
640 Wp 22.90 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
VS
Longi Solar LR7-72HVHF-645M
LR7-72HVHF-645M
645 Wp 23.90 % N-type
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 DHN-78X16/DG-640W LR7-72HVHF-645M Difference
Module efficiency 22.90 % 23.90 % 1.00 pp more efficient
Temperature coefficient -0.290 %/°C -0.260 %/°C 0.030 %/°C better in heat
Power density 229.0 Wp/m² 238.8 Wp/m² 9.8 Wp/m² higher
Weight 34.2 kg 28.5 kg 5.7 kg lighter
Weight per kWp 53.4 kg/kWp 44.2 kg/kWp 9.3 kg/kWp lighter
Module area 2.795 m² 2.701 m² 0.094 m² apart
Open-circuit voltage 56.40 V 53.80 V 2.60 V apart
Cell technology TOPCon N-type TOPCon vs N-type
Cell count 156 144 12 cells apart
Short-circuit current 14.32 A 15.21 A 0.89 A apart
Voltage at max power 47.60 V 44.46 V 3.14 V apart
Bifacial Yes No Yes vs No
Current at max power 13.45 A 14.51 A 1.06 A apart
Dimensions 2465x1134x34 mm 2382x1134x30 mm 2465x1134x34 mm vs 2382x1134x30 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
DHN-78X16/DG-640W
21,473 kWh
LR7-72HVHF-645M
21,641 kWh
Lifetime gap
168 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario DHN-78X16/DG-640W LR7-72HVHF-645M
Standard test conditions 25 °C 100.0% of rated power 640 W 645 W
Cool, bright day 40 °C 95.7% of rated power 612 W 620 W
Typical summer roof 55 °C 91.3% of rated power 584 W 595 W
Hot roof 70 °C 87.0% of rated power 556 W 570 W
03

Full specification

Parameter DHN-78X16/DG-640W LR7-72HVHF-645M Difference
Power and efficiency
Rated power 640 Wp 645 Wp Effectively the same
Module efficiency 22.90 % 23.90 % +1.00 pp for LR7-72HVHF-645M
Power density 229.0 Wp/m² 238.8 Wp/m² +9.8 Wp/m² for LR7-72HVHF-645M
Open-circuit voltage 56.40 V 53.80 V 2.60 V apart
Voltage at max power 47.60 V 44.46 V 3.14 V apart
Short-circuit current 14.32 A 15.21 A 0.89 A apart
Current at max power 13.45 A 14.51 A 1.06 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.260 %/°C +0.030 %/°C for LR7-72HVHF-645M
Mechanical
Dimensions 2465x1134x34 mm 2382x1134x30 mm 2465x1134x34 mm vs 2382x1134x30 mm
Module area 2.795 m² 2.701 m² 0.094 m² apart
Weight 34.2 kg 28.5 kg -5.7 kg for LR7-72HVHF-645M
Weight per kWp 53.4 kg/kWp 44.2 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 TOPCon N-type TOPCon vs N-type
Cell type Monocrystalline Monocrystalline Same
Cell count 156 144 12 cells apart
Bifacial Yes No Yes vs No
04

Against the whole database

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

More useful comparisons

Open the full database
Same series, other bin
DAH Solar
DAH Solar DHN-78X16/DG-640W vs DAH Solar DHN-78X16/DG-635W
The same specification on paper
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DAH Solar
DAH Solar DHN-78X16/DG-640W vs DAH Solar DHN-78X16/DG-630W
3 differences, the largest is module efficiency
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DAH Solar
DAH Solar DHN-78X16/DG-640W vs DAH Solar DHN-78X16/DG-625W
3 differences, the largest is module efficiency
Same series, other bin
DAH Solar
DAH Solar DHN-78X16/DG-640W vs DAH Solar DHN-78X16/DG-620W
3 differences, the largest is module efficiency
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
06

Written summary

07

Questions about this pairing

Which panel is better: DAH Solar DHN-78X16/DG-640W or Longi Solar LR7-72HVHF-645M?
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 DAH Solar DHN-78X16/DG-640W and Longi Solar LR7-72HVHF-645M?
DAH Solar DHN-78X16/DG-640 W has a module efficiency of 22.90%, while Longi Solar LR7-72HVHF-645M is 23.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does DAH Solar DHN-78X16/DG-640W use vs Longi Solar LR7-72HVHF-645M?
DAH Solar DHN-78X16/DG-640 W uses TOPCon cells; Longi Solar LR7-72HVHF-645M 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 DAH Solar DHN-78X16/DG-640W and Longi Solar LR7-72HVHF-645M?
DAH Solar DHN-78X16/DG-640 W has a 30 years power warranty; Longi Solar LR7-72HVHF-645M 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 DAH Solar DHN-78X16/DG-640W and Longi Solar LR7-72HVHF-645M 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 DAH Solar and Longi 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.