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DM645M10T-B78HSW vs DM720G12T-B66HSW 10 of 19 identical Swap Change panels

DMEGC DM645M10T-B78HSW vs DMEGC DM720G12T-B66HSW

DMEGC DM645M10T-B78HSW
DM645M10T-B78HSW
645 Wp 23.10 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
DMEGC DM720G12T-B66HSW
DM720G12T-B66HSW
720 Wp 23.20 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

9 differences, and they point both ways

The largest is rated power: 75 W more power. 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 DM645M10T-B78HSW DM720G12T-B66HSW Difference
Rated power 645 Wp 720 Wp 75 W more power
Weight 33.5 kg 37.7 kg 4.2 kg lighter
Open-circuit voltage 57.90 V 49.20 V 8.70 V apart
Short-circuit current 14.19 A 18.60 A 4.41 A apart
Module area 2.795 m² 3.106 m² 0.311 m² apart
Voltage at max power 48.05 V 41.10 V 6.95 V apart
Current at max power 13.44 A 17.54 A 4.10 A apart
Cell count 156 132 24 cells apart
Dimensions 2465x1134x30 mm 2384x1303x33 mm 2465x1134x30 mm vs 2384x1303x33 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 (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
DM645M10T-B78HSW
21,641 kWh
DM720G12T-B66HSW
24,157 kWh
Lifetime gap
2,516 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario DM645M10T-B78HSW DM720G12T-B66HSW
Standard test conditions 25 °C 100.0% of rated power 645 W 720 W
Cool, bright day 40 °C 95.7% of rated power 617 W 689 W
Typical summer roof 55 °C 91.3% of rated power 589 W 657 W
Hot roof 70 °C 87.0% of rated power 561 W 626 W
03

Full specification

Parameter DM645M10T-B78HSW DM720G12T-B66HSW Difference
Power and efficiency
Rated power 645 Wp 720 Wp +75 W for DM720G12T-B66HSW
Module efficiency 23.10 % 23.20 % Effectively the same
Power density 230.7 Wp/m² 231.8 Wp/m² Effectively the same
Open-circuit voltage 57.90 V 49.20 V 8.70 V apart
Voltage at max power 48.05 V 41.10 V 6.95 V apart
Short-circuit current 14.19 A 18.60 A 4.41 A apart
Current at max power 13.44 A 17.54 A 4.10 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2465x1134x30 mm 2384x1303x33 mm 2465x1134x30 mm vs 2384x1303x33 mm
Module area 2.795 m² 3.106 m² 0.311 m² apart
Weight 33.5 kg 37.7 kg -4.2 kg for DM645M10T-B78HSW
Weight per kWp 51.9 kg/kWp 52.4 kg/kWp Effectively the same
Warranty and degradation
Product warranty 15 yrs 15 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.40 %/yr Same
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 156 132 24 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#1,570 vs #1,306
DM720G12T-B66HSW leads by 264 places
Power density
#1,654 vs #1,347
DM720G12T-B66HSW leads by 307 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#5,361 vs #5,850
DM645M10T-B78HSW leads by 489 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,491 vs #339
DM720G12T-B66HSW leads by 1,152 places
05

More useful comparisons

Open the full database
Same series, other bin
DMEGC DM645M10T-B78HSW vs DMEGC DM650M10T-B78HSW
One difference: module efficiency
Same series, other bin
DMEGC DM645M10T-B78HSW vs DMEGC DM640M10T-B78HSW
One difference: module efficiency
Same series, other bin
DMEGC DM645M10T-B78HSW vs DMEGC DM635M10T-B78HSW
3 differences, the largest is module efficiency
Same series, other bin
DMEGC DM645M10T-B78HSW vs DMEGC DM630M10T-B78HSW
3 differences, the largest is module efficiency
Same series, other bin
DMEGC DM645M10T-B78HSW vs DMEGC DM600M10T-B72HSW
7 differences, the largest is rated power
Same series, other bin
DMEGC DM645M10T-B78HSW vs DMEGC DM595M10T-B72HSW
7 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: DMEGC DM645M10T-B78HSW or DMEGC DM720G12T-B66HSW?
According to our database: DMEGC DM720G12T-B66HSW has higher module efficiency (23.20% vs 23.10%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of DMEGC DM645M10T-B78HSW and DMEGC DM720G12T-B66HSW?
DMEGC DM645M10T-B78HSW has a module efficiency of 23.10%, while DMEGC DM720G12T-B66HSW is 23.20%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does DMEGC DM645M10T-B78HSW use vs DMEGC DM720G12T-B66HSW?
DMEGC DM645M10T-B78HSW uses TOPCon cells; DMEGC DM720G12T-B66HSW 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 DMEGC DM645M10T-B78HSW and DMEGC DM720G12T-B66HSW?
DMEGC DM645M10T-B78HSW has a 30 years power warranty; DMEGC DM720G12T-B66HSW 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 DMEGC DM645M10T-B78HSW and DMEGC DM720G12T-B66HSW bifacial panels?
Both DMEGC DM645M10T-B78HSW and DMEGC DM720G12T-B66HSW 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.