EGing PV EG-685NT66-HU/BF-DG vs EGing PV EG-660NT66-HU/BF-DG
VS
The verdict
685NT66-HU/BF-DG leads on the differences that matter
The largest is module efficiency: 0.81 pp more efficient. 13 of 19 comparable parameters are identical.
See all 6 differencesHow alike are they
13
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
6 of 19 parameters
What actually differs
Parameter
685NT66-HU/BF-DG
660NT66-HU/BF-DG
Difference
Module efficiency
22.05 %
21.24 %
0.81 pp more efficient
Power density
220.5 Wp/m²
212.5 Wp/m²
8.0 Wp/m² higher
Rated power
685 Wp
660 Wp
25 W more power
Weight per kWp
55.9 kg/kWp
58.0 kg/kWp
2.1 kg/kWp lighter
Open-circuit voltage
47.64 V
46.61 V
1.03 V apart
Voltage at max power
39.85 V
38.78 V
1.07 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
Same temp coeff. for both panels (-0.300 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
685NT66-HU/BF-DG
22,983 kWh
660NT66-HU/BF-DG
22,144 kWh
Lifetime gap
839 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
685NT66-HU/BF-DG
660NT66-HU/BF-DG
Standard test conditions
25 °C
100.0% of rated power
685 W
660 W
Cool, bright day
40 °C
95.5% of rated power
654 W
630 W
Typical summer roof
55 °C
91.0% of rated power
623 W
601 W
Hot roof
70 °C
86.5% of rated power
593 W
571 W
03
Full specification
Parameter
685NT66-HU/BF-DG
660NT66-HU/BF-DG
Difference
Power and efficiency
Rated power
685 Wp
660 Wp
+25 W for 685NT66-HU/BF-DG
Module efficiency
22.05 %
21.24 %
+0.81 pp for 685NT66-HU/BF-DG
Power density
220.5 Wp/m²
212.5 Wp/m²
+8.0 Wp/m² for 685NT66-HU/BF-DG
Open-circuit voltage
47.64 V
46.61 V
1.03 V apart
Voltage at max power
39.85 V
38.78 V
1.07 V apart
Short-circuit current
18.22 A
18.03 A
Effectively the same
Current at max power
17.19 A
17.02 A
Effectively the same
Temperature
Temperature coefficient
-0.300 %/°C
-0.300 %/°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
55.9 kg/kWp
58.0 kg/kWp
-2.1 kg/kWp for 685NT66-HU/BF-DG
Warranty and degradation
Product warranty
12 yrs
12 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
14,005 panels
Against the whole database
Efficiency
#6,233
vs
#9,034
685NT66-HU/BF-DG leads by 2,801 places
Power density
#6,208
vs
#8,959
685NT66-HU/BF-DG leads by 2,751 places
Heat behaviour
#6,093
vs
#6,093
Tied - the same position in the database
Weight
#10,276
vs
#11,529
685NT66-HU/BF-DG leads by 1,253 places
Warranty
#21
vs
#21
Tied - the same position in the database
Overall
#1,726
vs
#3,174
685NT66-HU/BF-DG leads by 1,448 places
05
Open the full database
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06
Written summary
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07
Questions about this pairing
Which panel is better: EGing PV EG-685NT66-HU/BF-DG or EGing PV EG-660NT66-HU/BF-DG?
According to our database: EGing PV EG-685NT66-HU/BF-DG has higher module efficiency (22.05% vs 21.24%). 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-660NT66-HU/BF-DG?
EGing PV EG-685NT66-HU/BF-DG has a module efficiency of 22.05%, while EGing PV EG-660NT66-HU/BF-DG is 21.24%. 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-660NT66-HU/BF-DG?
EGing PV EG-685NT66-HU/BF-DG uses TOPCon cells; EGing PV EG-660NT66-HU/BF-DG 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 EGing PV EG-685NT66-HU/BF-DG and EGing PV EG-660NT66-HU/BF-DG?
EGing PV EG-685NT66-HU/BF-DG has a 30 years power warranty; EGing PV EG-660NT66-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-660NT66-HU/BF-DG bifacial panels?
Both EGing PV EG-685NT66-HU/BF-DG and EGing PV EG-660NT66-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.