Skip to main content
DM705G12T-B66HSW vs DM635G12RT-B66HSW 9 of 19 identical Swap Change panels

DMEGC DM705G12T-B66HSW vs DMEGC DM635G12RT-B66HSW

DMEGC DM705G12T-B66HSW
DM705G12T-B66HSW
705 Wp 22.70 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
DMEGC DM635G12RT-B66HSW
DM635G12RT-B66HSW
635 Wp 23.50 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

DM635G12RT-B66HSW leads on the differences that matter

The largest is module efficiency: 0.80 pp more efficient. 9 of 19 comparable parameters are identical.

See all 10 differences
How alike are they
9 of 19 comparable
parameters are identical
identical differs
01

What actually differs

10 of 19 parameters
Parameter DM705G12T-B66HSW DM635G12RT-B66HSW Difference
Module efficiency 22.70 % 23.50 % 0.80 pp more efficient
Rated power 705 Wp 635 Wp 70 W more power
Weight 37.7 kg 32.3 kg 5.4 kg lighter
Power density 227.0 Wp/m² 235.1 Wp/m² 8.1 Wp/m² higher
Short-circuit current 18.48 A 16.29 A 2.19 A apart
Module area 3.106 m² 2.701 m² 0.405 m² apart
Current at max power 17.40 A 15.35 A 2.05 A apart
Weight per kWp 53.5 kg/kWp 50.9 kg/kWp 2.6 kg/kWp lighter
Open-circuit voltage 48.62 V 49.69 V 1.07 V apart
Dimensions 2384x1303x33 mm 2382x1134x30 mm 2384x1303x33 mm vs 2382x1134x30 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.
DM705G12T-B66HSW
23,654 kWh
DM635G12RT-B66HSW
21,306 kWh
Lifetime gap
2,348 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario DM705G12T-B66HSW DM635G12RT-B66HSW
Standard test conditions 25 °C 100.0% of rated power 705 W 635 W
Cool, bright day 40 °C 95.7% of rated power 674 W 607 W
Typical summer roof 55 °C 91.3% of rated power 644 W 580 W
Hot roof 70 °C 87.0% of rated power 613 W 552 W
03

Full specification

Parameter DM705G12T-B66HSW DM635G12RT-B66HSW Difference
Power and efficiency
Rated power 705 Wp 635 Wp +70 W for DM705G12T-B66HSW
Module efficiency 22.70 % 23.50 % +0.80 pp for DM635G12RT-B66HSW
Power density 227.0 Wp/m² 235.1 Wp/m² +8.1 Wp/m² for DM635G12RT-B66HSW
Open-circuit voltage 48.62 V 49.69 V 1.07 V apart
Voltage at max power 40.58 V 41.45 V Effectively the same
Short-circuit current 18.48 A 16.29 A 2.19 A apart
Current at max power 17.40 A 15.35 A 2.05 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2384x1303x33 mm 2382x1134x30 mm 2384x1303x33 mm vs 2382x1134x30 mm
Module area 3.106 m² 2.701 m² 0.405 m² apart
Weight 37.7 kg 32.3 kg -5.4 kg for DM635G12RT-B66HSW
Weight per kWp 53.5 kg/kWp 50.9 kg/kWp -2.6 kg/kWp for DM635G12RT-B66HSW
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 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#3,307 vs #716
DM635G12RT-B66HSW leads by 2,591 places
Power density
#3,361 vs #741
DM635G12RT-B66HSW leads by 2,620 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#7,434 vs #4,252
DM635G12RT-B66HSW leads by 3,182 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#747 vs #1,437
DM705G12T-B66HSW leads by 690 places
05

More useful comparisons

Open the full database
Same series, other bin
DMEGC DM705G12T-B66HSW vs DMEGC DM720G12T-B66HSW
3 differences, the largest is module efficiency
Same series, other bin
DMEGC DM705G12T-B66HSW vs DMEGC DM715G12T-B66HSW
3 differences, the largest is module efficiency
Same series, other bin
DMEGC DM705G12T-B66HSW vs DMEGC DM710G12T-B66HSW
One difference: module efficiency
Same series, other bin
DMEGC DM705G12T-B66HSW vs DMEGC DM700G12T-B66HSW
One difference: module efficiency
Same series, other bin
DMEGC DM705G12T-B66HSW vs DMEGC DM695G12T-B66HSW
3 differences, the largest is module efficiency
Same series, other bin
DMEGC DM705G12T-B66HSW vs DMEGC DM630G12RT-B66HSW
9 differences, the largest is rated power
06

Written summary

07

Questions about this pairing

Which panel is better: DMEGC DM705G12T-B66HSW or DMEGC DM635G12RT-B66HSW?
According to our database: DMEGC DM635G12RT-B66HSW has higher module efficiency (23.50% vs 22.70%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of DMEGC DM705G12T-B66HSW and DMEGC DM635G12RT-B66HSW?
DMEGC DM705G12T-B66HSW has a module efficiency of 22.70%, while DMEGC DM635G12RT-B66HSW is 23.50%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does DMEGC DM705G12T-B66HSW use vs DMEGC DM635G12RT-B66HSW?
DMEGC DM705G12T-B66HSW uses TOPCon cells; DMEGC DM635G12RT-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 DM705G12T-B66HSW and DMEGC DM635G12RT-B66HSW?
DMEGC DM705G12T-B66HSW has a 30 years power warranty; DMEGC DM635G12RT-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 DM705G12T-B66HSW and DMEGC DM635G12RT-B66HSW bifacial panels?
Both DMEGC DM705G12T-B66HSW and DMEGC DM635G12RT-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.

Shop prices: See 83 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.