EGing PV EG-685NT66-HU/BF-DG vs EGing PV EG-670M66-HU/BF-DG
VS
The verdict
685NT66-HU/BF-DG leads on the differences that matter
The largest is temperature coefficient: 0.040 %/°C better in heat. 11 of 19 comparable parameters are identical.
See all 8 differencesHow alike are they
11
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
8 of 19 parameters
What actually differs
Parameter
685NT66-HU/BF-DG
670M66-HU/BF-DG
Difference
Temperature coefficient
-0.300 %/°C
-0.340 %/°C
0.040 %/°C better in heat
Module efficiency
22.05 %
21.56 %
0.49 pp more efficient
Power density
220.5 Wp/m²
215.7 Wp/m²
4.8 Wp/m² higher
Rated power
685 Wp
670 Wp
15 W more power
Cell technology
TOPCon
PERC
TOPCon vs PERC
Annual degradation
0.40 %/yr
0.45 %/yr
0.05 %/yr slower
Open-circuit voltage
47.64 V
46.20 V
1.44 V apart
Voltage at max power
39.85 V
38.38 V
1.47 V apart
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
685NT66-HU/BF-DG
22,983 kWh
670M66-HU/BF-DG
22,064 kWh
Lifetime gap
919 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
685NT66-HU/BF-DG
670M66-HU/BF-DG
Standard test conditions
25 °C
100.0% of rated power
685 W
670 W
Cool, bright day
40 °C
94.9% of rated power
654 W
636 W
Typical summer roof
55 °C
89.8% of rated power
623 W
602 W
Hot roof
70 °C
84.7% of rated power
593 W
567 W
03
Full specification
Parameter
685NT66-HU/BF-DG
670M66-HU/BF-DG
Difference
Power and efficiency
Rated power
685 Wp
670 Wp
+15 W for 685NT66-HU/BF-DG
Module efficiency
22.05 %
21.56 %
+0.49 pp for 685NT66-HU/BF-DG
Power density
220.5 Wp/m²
215.7 Wp/m²
+4.8 Wp/m² for 685NT66-HU/BF-DG
Open-circuit voltage
47.64 V
46.20 V
1.44 V apart
Voltage at max power
39.85 V
38.38 V
1.47 V apart
Short-circuit current
18.22 A
18.51 A
Effectively the same
Current at max power
17.19 A
17.46 A
Effectively the same
Temperature
Temperature coefficient
-0.300 %/°C
-0.340 %/°C
+0.040 %/°C for 685NT66-HU/BF-DG
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
55.9 kg/kWp
57.2 kg/kWp
Effectively the same
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
30 yrs
30 yrs
Same
Annual degradation
0.40 %/yr
0.45 %/yr
-0.05 %/yr for 685NT66-HU/BF-DG
Technology
Cell technology
TOPCon
PERC
TOPCon vs PERC
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
132
Same
Bifacial
Yes
Yes
Same
04
14,005 panels
Against the whole database
Efficiency
#6,233
vs
#7,774
685NT66-HU/BF-DG leads by 1,541 places
Power density
#6,208
vs
#7,644
685NT66-HU/BF-DG leads by 1,436 places
Heat behaviour
#6,093
vs
#8,778
685NT66-HU/BF-DG leads by 2,685 places
Weight
#10,276
vs
#11,112
685NT66-HU/BF-DG leads by 836 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,726
vs
#2,497
685NT66-HU/BF-DG leads by 771 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-685NT66-HU/BF-DG or EGing PV EG-670M66-HU/BF-DG?
According to our database: EGing PV EG-685NT66-HU/BF-DG has higher module efficiency (22.05% vs 21.56%); EGing PV EG-685NT66-HU/BF-DG tolerates heat better (temp coeff -0.300%/°C vs -0.340%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of EGing PV EG-685NT66-HU/BF-DG and EGing PV EG-670M66-HU/BF-DG?
EGing PV EG-685NT66-HU/BF-DG has a module efficiency of 22.05%, while EGing PV EG-670M66-HU/BF-DG is 21.56%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does EGing PV EG-685NT66-HU/BF-DG use vs EGing PV EG-670M66-HU/BF-DG?
EGing PV EG-685NT66-HU/BF-DG uses TOPCon cells; EGing PV EG-670M66-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-685NT66-HU/BF-DG and EGing PV EG-670M66-HU/BF-DG?
EGing PV EG-685NT66-HU/BF-DG has a 30 years power warranty; EGing PV EG-670M66-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-685NT66-HU/BF-DG and EGing PV EG-670M66-HU/BF-DG bifacial panels?
Both EGing PV EG-685NT66-HU/BF-DG and EGing PV EG-670M66-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.
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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.