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DM715G12T-B66HSW vs DM635M10T-B78HSW 8 of 19 identical Swap Change panels

DMEGC DM715G12T-B66HSW vs DMEGC DM635M10T-B78HSW

DMEGC DM715G12T-B66HSW
DM715G12T-B66HSW
715 Wp 23.00 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
DMEGC DM635M10T-B78HSW
DM635M10T-B78HSW
635 Wp 22.70 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

DM715G12T-B66HSW leads on the differences that matter

The largest is rated power: 80 W more power. 8 of 19 comparable parameters are identical.

See all 11 differences
How alike are they
8 of 19 comparable
parameters are identical
identical differs
01

What actually differs

11 of 19 parameters
Parameter DM715G12T-B66HSW DM635M10T-B78HSW Difference
Rated power 715 Wp 635 Wp 80 W more power
Weight 37.7 kg 33.5 kg 4.2 kg lighter
Open-circuit voltage 49.02 V 57.50 V 8.48 V apart
Short-circuit current 18.56 A 14.09 A 4.47 A apart
Module area 3.106 m² 2.795 m² 0.311 m² apart
Module efficiency 23.00 % 22.70 % 0.30 pp more efficient
Power density 230.2 Wp/m² 227.2 Wp/m² 3.0 Wp/m² higher
Voltage at max power 40.93 V 47.67 V 6.74 V apart
Current at max power 17.50 A 13.34 A 4.16 A apart
Cell count 132 156 24 cells apart
Dimensions 2384x1303x33 mm 2465x1134x30 mm 2384x1303x33 mm vs 2465x1134x30 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.
DM715G12T-B66HSW
23,990 kWh
DM635M10T-B78HSW
21,306 kWh
Lifetime gap
2,684 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario DM715G12T-B66HSW DM635M10T-B78HSW
Standard test conditions 25 °C 100.0% of rated power 715 W 635 W
Cool, bright day 40 °C 95.7% of rated power 684 W 607 W
Typical summer roof 55 °C 91.3% of rated power 653 W 580 W
Hot roof 70 °C 87.0% of rated power 622 W 552 W
03

Full specification

Parameter DM715G12T-B66HSW DM635M10T-B78HSW Difference
Power and efficiency
Rated power 715 Wp 635 Wp +80 W for DM715G12T-B66HSW
Module efficiency 23.00 % 22.70 % +0.30 pp for DM715G12T-B66HSW
Power density 230.2 Wp/m² 227.2 Wp/m² +3.0 Wp/m² for DM715G12T-B66HSW
Open-circuit voltage 49.02 V 57.50 V 8.48 V apart
Voltage at max power 40.93 V 47.67 V 6.74 V apart
Short-circuit current 18.56 A 14.09 A 4.47 A apart
Current at max power 17.50 A 13.34 A 4.16 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2384x1303x33 mm 2465x1134x30 mm 2384x1303x33 mm vs 2465x1134x30 mm
Module area 3.106 m² 2.795 m² 0.311 m² apart
Weight 37.7 kg 33.5 kg -4.2 kg for DM635M10T-B78HSW
Weight per kWp 52.7 kg/kWp 52.8 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 132 156 24 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#1,919 vs #3,307
DM715G12T-B66HSW leads by 1,388 places
Power density
#2,018 vs #3,252
DM715G12T-B66HSW leads by 1,234 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#6,393 vs #6,429
DM715G12T-B66HSW leads by 36 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#450 vs #1,913
DM715G12T-B66HSW leads by 1,463 places
05

More useful comparisons

Open the full database
Same series, other bin
DMEGC DM715G12T-B66HSW vs DMEGC DM720G12T-B66HSW
One difference: module efficiency
Same series, other bin
DMEGC DM715G12T-B66HSW vs DMEGC DM710G12T-B66HSW
The same specification on paper
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DMEGC DM715G12T-B66HSW vs DMEGC DM705G12T-B66HSW
3 differences, the largest is module efficiency
Same series, other bin
DMEGC DM715G12T-B66HSW vs DMEGC DM700G12T-B66HSW
3 differences, the largest is module efficiency
Same series, other bin
DMEGC DM715G12T-B66HSW vs DMEGC DM695G12T-B66HSW
3 differences, the largest is module efficiency
Same series, other bin
DMEGC DM715G12T-B66HSW vs DMEGC DM635G12RT-B66HSW
8 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: DMEGC DM715G12T-B66HSW or DMEGC DM635M10T-B78HSW?
According to our database: DMEGC DM715G12T-B66HSW has higher module efficiency (23.00% vs 22.70%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of DMEGC DM715G12T-B66HSW and DMEGC DM635M10T-B78HSW?
DMEGC DM715G12T-B66HSW has a module efficiency of 23.00%, while DMEGC DM635M10T-B78HSW is 22.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does DMEGC DM715G12T-B66HSW use vs DMEGC DM635M10T-B78HSW?
DMEGC DM715G12T-B66HSW uses TOPCon cells; DMEGC DM635M10T-B78HSW 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 DM715G12T-B66HSW and DMEGC DM635M10T-B78HSW?
DMEGC DM715G12T-B66HSW has a 30 years power warranty; DMEGC DM635M10T-B78HSW 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 DM715G12T-B66HSW and DMEGC DM635M10T-B78HSW bifacial panels?
Both DMEGC DM715G12T-B66HSW and DMEGC DM635M10T-B78HSW 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.