EGing PV EG-670M66-HU/BF-DG vs EGing PV EG-665M66-HU/BF-DG
VS
The verdict
Identical on every published parameter
All 19 comparable parameters agree. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from.
How alike are they
19
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
0 of 19 parameters
What actually differs
Every comparable parameter agrees. The full specification is below.
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 (-0.340 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
670M66-HU/BF-DG
22,064 kWh
665M66-HU/BF-DG
21,899 kWh
Lifetime gap
165 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
670M66-HU/BF-DG
665M66-HU/BF-DG
Standard test conditions
25 °C
100.0% of rated power
670 W
665 W
Cool, bright day
40 °C
94.9% of rated power
636 W
631 W
Typical summer roof
55 °C
89.8% of rated power
602 W
597 W
Hot roof
70 °C
84.7% of rated power
567 W
563 W
03
Full specification
Parameter
670M66-HU/BF-DG
665M66-HU/BF-DG
Difference
Power and efficiency
Rated power
670 Wp
665 Wp
Effectively the same
Module efficiency
21.56 %
21.40 %
Effectively the same
Power density
215.7 Wp/m²
214.1 Wp/m²
Effectively the same
Open-circuit voltage
46.20 V
46.02 V
Effectively the same
Voltage at max power
38.38 V
38.22 V
Effectively the same
Short-circuit current
18.51 A
18.45 A
Effectively the same
Current at max power
17.46 A
17.40 A
Effectively the same
Temperature
Temperature coefficient
-0.340 %/°C
-0.340 %/°C
Same
Mechanical
Dimensions
2384x1303x35 mm
2384x1303x35 mm
Same
Module area
3.106 m²
3.106 m²
Same
Weight
38.3 kg
38.3 kg
Same
Weight per kWp
57.2 kg/kWp
57.6 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.45 %/yr
0.45 %/yr
Same
Technology
Cell technology
PERC
PERC
Same
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
132
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#7,774
vs
#8,323
670M66-HU/BF-DG leads by 549 places
Power density
#7,644
vs
#8,250
670M66-HU/BF-DG leads by 606 places
Heat behaviour
#8,778
vs
#8,778
Tied - the same position in the database
Weight
#11,112
vs
#11,303
670M66-HU/BF-DG leads by 191 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#2,497
vs
#2,833
670M66-HU/BF-DG leads by 336 places
05
Open the full database
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06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: EGing PV EG-670M66-HU/BF-DG or EGing PV EG-665M66-HU/BF-DG?
According to our database: EGing PV EG-670M66-HU/BF-DG has higher module efficiency (21.56% vs 21.40%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of EGing PV EG-670M66-HU/BF-DG and EGing PV EG-665M66-HU/BF-DG?
EGing PV EG-670M66-HU/BF-DG has a module efficiency of 21.56%, while EGing PV EG-665M66-HU/BF-DG is 21.40%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does EGing PV EG-670M66-HU/BF-DG use vs EGing PV EG-665M66-HU/BF-DG?
EGing PV EG-670M66-HU/BF-DG uses PERC cells; EGing PV EG-665M66-HU/BF-DG uses PERC. 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 EGing PV EG-670M66-HU/BF-DG and EGing PV EG-665M66-HU/BF-DG?
EGing PV EG-670M66-HU/BF-DG has a 30 years power warranty; EGing PV EG-665M66-HU/BF-DG 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 EGing PV EG-670M66-HU/BF-DG and EGing PV EG-665M66-HU/BF-DG bifacial panels?
Both EGing PV EG-670M66-HU/BF-DG and EGing PV EG-665M66-HU/BF-DG 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 3 EGing PV 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.