DM695G12T-B66HSW vs DM645M10T-B78HSW 7 of 19 identical Swap Change panels

DMEGC DM695G12T-B66HSW vs DMEGC DM645M10T-B78HSW

Q: Which panel is better: DMEGC DM695G12T-B66HSW or DMEGC DM645M10T-B78HSW?

According to our database: DMEGC DM645M10T-B78HSW has higher module efficiency (23.10% vs 22.40%). See the full spec comparison and 30-year energy simulation above for a complete picture.

Q: What is the efficiency of DMEGC DM695G12T-B66HSW and DMEGC DM645M10T-B78HSW?

DMEGC DM695G12T-B66HSW has a module efficiency of 22.40%, while DMEGC DM645M10T-B78HSW is 23.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does DMEGC DM695G12T-B66HSW use vs DMEGC DM645M10T-B78HSW?

DMEGC DM695G12T-B66HSW uses TOPCon cells; DMEGC DM645M10T-B78HSW uses TOPCon. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.

Q: What is the warranty on DMEGC DM695G12T-B66HSW and DMEGC DM645M10T-B78HSW?

DMEGC DM695G12T-B66HSW has a 30 years power warranty; DMEGC DM645M10T-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.

Q: Are DMEGC DM695G12T-B66HSW and DMEGC DM645M10T-B78HSW bifacial panels?

Both DMEGC DM695G12T-B66HSW and DMEGC DM645M10T-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.

DM695G12T-B66HSW

695 Wp 22.40 % TOPCon Bifacial

Open panel page Datasheet PDF

DM645M10T-B78HSW

645 Wp 23.10 % TOPCon Bifacial

Open panel page Datasheet PDF

The verdict

DM645M10T-B78HSW leads on the differences that matter

The largest is module efficiency: 0.70 pp more efficient. 7 of 19 comparable parameters are identical.

See all 12 differences

How alike are they

7 of 19 comparable
parameters are identical

identical differs

What actually differs

12 of 19 parameters

Parameter DM695G12T-B66HSW DM645M10T-B78HSW Difference

Module efficiency 22.40 % 23.10 % 0.70 pp more efficient

Rated power 695 Wp 645 Wp 50 W more power

Weight 37.7 kg 33.5 kg 4.2 kg lighter

Power density 223.7 Wp/m² 230.7 Wp/m² 7.0 Wp/m² higher

Open-circuit voltage 48.22 V 57.90 V 9.68 V apart

Short-circuit current 18.38 A 14.19 A 4.19 A apart

Module area 3.106 m² 2.795 m² 0.311 m² apart

Voltage at max power 40.20 V 48.05 V 7.85 V apart

Current at max power 17.30 A 13.44 A 3.86 A apart

Cell count 132 156 24 cells apart

Weight per kWp 54.2 kg/kWp 51.9 kg/kWp 2.3 kg/kWp lighter

Dimensions 2384x1303x33 mm 2465x1134x30 mm 2384x1303x33 mm vs 2465x1134x30 mm

What it means on a roof

Thirty years of production

Each panel's own declared degradation curve, at 1,200 kWh/kWp a year

Cell temperature

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.

DM695G12T-B66HSW

23,319 kWh

DM645M10T-B78HSW

21,641 kWh

Lifetime gap

1,678 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario DM695G12T-B66HSW DM645M10T-B78HSW

Standard test conditions 25 °C 100.0% of rated power 695 W 645 W

Cool, bright day 40 °C 95.7% of rated power 665 W 617 W

Typical summer roof 55 °C 91.3% of rated power 635 W 589 W

Hot roof 70 °C 87.0% of rated power 604 W 561 W

Full specification

Parameter DM695G12T-B66HSW DM645M10T-B78HSW Difference

Power and efficiency

Rated power 695 Wp 645 Wp +50 W for DM695G12T-B66HSW

Module efficiency 22.40 % 23.10 % +0.70 pp for DM645M10T-B78HSW

Power density 223.7 Wp/m² 230.7 Wp/m² +7.0 Wp/m² for DM645M10T-B78HSW

Open-circuit voltage 48.22 V 57.90 V 9.68 V apart

Voltage at max power 40.20 V 48.05 V 7.85 V apart

Short-circuit current 18.38 A 14.19 A 4.19 A apart

Current at max power 17.30 A 13.44 A 3.86 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 DM645M10T-B78HSW

Weight per kWp 54.2 kg/kWp 51.9 kg/kWp -2.3 kg/kWp for DM645M10T-B78HSW

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

Against the whole database

14,005 panels

Efficiency

#4,774 vs #1,570

DM645M10T-B78HSW leads by 3,204 places

Power density

#4,877 vs #1,654

DM645M10T-B78HSW leads by 3,223 places

Heat behaviour

#2,165 vs #2,165

Tied - the same position in the database

Weight

#8,493 vs #5,361

DM645M10T-B78HSW leads by 3,132 places

Warranty

#21 vs #21

Tied - the same position in the database

Overall

#1,084 vs #1,491

DM695G12T-B66HSW leads by 407 places

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The same specification on paper

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Written summary

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Questions about this pairing

Which panel is better: DMEGC DM695G12T-B66HSW or DMEGC DM645M10T-B78HSW?

According to our database: DMEGC DM645M10T-B78HSW has higher module efficiency (23.10% vs 22.40%). See the full spec comparison and 30-year energy simulation above for a complete picture.

What is the efficiency of DMEGC DM695G12T-B66HSW and DMEGC DM645M10T-B78HSW?

DMEGC DM695G12T-B66HSW has a module efficiency of 22.40%, while DMEGC DM645M10T-B78HSW is 23.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

What cell technology does DMEGC DM695G12T-B66HSW use vs DMEGC DM645M10T-B78HSW?

DMEGC DM695G12T-B66HSW uses TOPCon cells; DMEGC DM645M10T-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 DM695G12T-B66HSW and DMEGC DM645M10T-B78HSW?

DMEGC DM695G12T-B66HSW has a 30 years power warranty; DMEGC DM645M10T-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 DM695G12T-B66HSW and DMEGC DM645M10T-B78HSW bifacial panels?

Both DMEGC DM695G12T-B66HSW and DMEGC DM645M10T-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.

Shop prices: See 82 DMEGC offers

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.