Skip to main content
DM645M10T-B78HSW vs DM590M10T-B72HSW 11 of 19 identical Swap Change panels

DMEGC DM645M10T-B78HSW vs DMEGC DM590M10T-B72HSW

DMEGC DM645M10T-B78HSW
DM645M10T-B78HSW
645 Wp 23.10 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
DMEGC DM590M10T-B72HSW
DM590M10T-B72HSW
590 Wp 22.80 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

DM645M10T-B78HSW leads on the differences that matter

The largest is rated power: 55 W more power. 11 of 19 comparable parameters are identical.

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

What actually differs

8 of 19 parameters
Parameter DM645M10T-B78HSW DM590M10T-B72HSW Difference
Rated power 645 Wp 590 Wp 55 W more power
Open-circuit voltage 57.90 V 52.90 V 5.00 V apart
Module area 2.795 m² 2.583 m² 0.212 m² apart
Module efficiency 23.10 % 22.80 % 0.30 pp more efficient
Weight 33.5 kg 31.8 kg 1.7 kg lighter
Cell count 156 144 12 cells apart
Voltage at max power 48.05 V 44.23 V 3.82 V apart
Dimensions 2465x1134x30 mm 2278x1134x30 mm 2465x1134x30 mm vs 2278x1134x30 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
DM590M10T-B72HSW
19,796 kWh
Lifetime gap
1,845 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario DM645M10T-B78HSW DM590M10T-B72HSW
Standard test conditions 25 °C 100.0% of rated power 645 W 590 W
Cool, bright day 40 °C 95.7% of rated power 617 W 564 W
Typical summer roof 55 °C 91.3% of rated power 589 W 539 W
Hot roof 70 °C 87.0% of rated power 561 W 513 W
03

Full specification

Parameter DM645M10T-B78HSW DM590M10T-B72HSW Difference
Power and efficiency
Rated power 645 Wp 590 Wp +55 W for DM645M10T-B78HSW
Module efficiency 23.10 % 22.80 % +0.30 pp for DM645M10T-B78HSW
Power density 230.7 Wp/m² 228.4 Wp/m² Effectively the same
Open-circuit voltage 57.90 V 52.90 V 5.00 V apart
Voltage at max power 48.05 V 44.23 V 3.82 V apart
Short-circuit current 14.19 A 14.11 A Effectively the same
Current at max power 13.44 A 13.36 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2465x1134x30 mm 2278x1134x30 mm 2465x1134x30 mm vs 2278x1134x30 mm
Module area 2.795 m² 2.583 m² 0.212 m² apart
Weight 33.5 kg 31.8 kg -1.7 kg for DM590M10T-B72HSW
Weight per kWp 51.9 kg/kWp 53.9 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 156 144 12 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#1,570 vs #2,714
DM645M10T-B78HSW leads by 1,144 places
Power density
#1,654 vs #2,598
DM645M10T-B78HSW leads by 944 places
Heat behaviour
#2,165 vs #2,165
Tied - the same position in the database
Weight
#5,361 vs #8,021
DM645M10T-B78HSW leads by 2,660 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#1,491 vs #3,167
DM645M10T-B78HSW leads by 1,676 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 DM590M10T-B72HSW?
According to our database: DMEGC DM645M10T-B78HSW has higher module efficiency (23.10% vs 22.80%). 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 DM590M10T-B72HSW?
DMEGC DM645M10T-B78HSW has a module efficiency of 23.10%, while DMEGC DM590M10T-B72HSW is 22.80%. 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 DM590M10T-B72HSW?
DMEGC DM645M10T-B78HSW uses TOPCon cells; DMEGC DM590M10T-B72HSW 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 DM590M10T-B72HSW?
DMEGC DM645M10T-B78HSW has a 30 years power warranty; DMEGC DM590M10T-B72HSW 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 DM590M10T-B72HSW bifacial panels?
Both DMEGC DM645M10T-B78HSW and DMEGC DM590M10T-B72HSW 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.