EGing PV EG-670M66-HUV vs EGing PV EG-685NT66-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. 7 of 19 comparable parameters are identical.
See all 12 differencesHow alike are they
7
of 19 comparable
parameters are identical
parameters are identical
identical
differs
01
12 of 19 parameters
What actually differs
Parameter
670M66-HUV
685NT66-HU/BF-DG
Difference
Temperature coefficient
-0.340 %/°C
-0.300 %/°C
0.040 %/°C better in heat
Performance warranty
25 yrs
30 yrs
5 yrs longer
Module efficiency
21.56 %
22.05 %
0.49 pp more efficient
Annual degradation
0.55 %/yr
0.40 %/yr
0.15 %/yr slower
Weight
32.9 kg
38.3 kg
5.4 kg lighter
Weight per kWp
49.1 kg/kWp
55.9 kg/kWp
6.8 kg/kWp lighter
Power density
215.7 Wp/m²
220.5 Wp/m²
4.8 Wp/m² higher
Rated power
670 Wp
685 Wp
15 W more power
Cell technology
PERC
TOPCon
PERC vs TOPCon
Open-circuit voltage
45.97 V
47.64 V
1.67 V apart
Bifacial
No
Yes
No vs Yes
Voltage at max power
38.16 V
39.85 V
1.69 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
670M66-HUV
21,714 kWh
685NT66-HU/BF-DG
22,983 kWh
Lifetime gap
1,269 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
670M66-HUV
685NT66-HU/BF-DG
Standard test conditions
25 °C
100.0% of rated power
670 W
685 W
Cool, bright day
40 °C
94.9% of rated power
636 W
654 W
Typical summer roof
55 °C
89.8% of rated power
602 W
623 W
Hot roof
70 °C
84.7% of rated power
567 W
593 W
03
Full specification
Parameter
670M66-HUV
685NT66-HU/BF-DG
Difference
Power and efficiency
Rated power
670 Wp
685 Wp
+15 W for 685NT66-HU/BF-DG
Module efficiency
21.56 %
22.05 %
+0.49 pp for 685NT66-HU/BF-DG
Power density
215.7 Wp/m²
220.5 Wp/m²
+4.8 Wp/m² for 685NT66-HU/BF-DG
Open-circuit voltage
45.97 V
47.64 V
1.67 V apart
Voltage at max power
38.16 V
39.85 V
1.69 V apart
Short-circuit current
18.61 A
18.22 A
Effectively the same
Current at max power
17.56 A
17.19 A
Effectively the same
Temperature
Temperature coefficient
-0.340 %/°C
-0.300 %/°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
32.9 kg
38.3 kg
-5.4 kg for 670M66-HUV
Weight per kWp
49.1 kg/kWp
55.9 kg/kWp
-6.8 kg/kWp for 670M66-HUV
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
25 yrs
30 yrs
+5 yrs for 685NT66-HU/BF-DG
Annual degradation
0.55 %/yr
0.40 %/yr
-0.15 %/yr for 685NT66-HU/BF-DG
Technology
Cell technology
PERC
TOPCon
PERC vs TOPCon
Cell type
Monocrystalline
Monocrystalline
Same
Cell count
132
132
Same
Bifacial
No
Yes
No vs Yes
04
14,005 panels
Against the whole database
Efficiency
#7,774
vs
#6,233
685NT66-HU/BF-DG leads by 1,541 places
Power density
#7,644
vs
#6,208
685NT66-HU/BF-DG leads by 1,436 places
Heat behaviour
#8,778
vs
#6,093
685NT66-HU/BF-DG leads by 2,685 places
Weight
#2,745
vs
#10,276
670M66-HUV leads by 7,531 places
Warranty
#9,798
vs
#21
685NT66-HU/BF-DG leads by 9,777 places
Overall
#3,378
vs
#1,726
685NT66-HU/BF-DG leads by 1,652 places
05
Open the full database
More useful comparisons
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12 differences, the largest is temperature coefficient
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9 differences, the largest is temperature coefficient
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5 differences, the largest is performance warranty
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EGing PV EG-670M66-HUV vs EGing PV EG-665NT66-HU/BF-DG
9 differences, the largest is temperature coefficient
Same series, other bin
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EGing PV EG-670M66-HUV vs EGing PV EG-665M66-HU/BF-DG
5 differences, the largest is performance warranty
06
Written summary
Checking cache...
07
Questions about this pairing
Which panel is better: EGing PV EG-670M66-HUV or EGing PV EG-685NT66-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-670M66-HUV and EGing PV EG-685NT66-HU/BF-DG?
EGing PV EG-670M66-HUV has a module efficiency of 21.56%, while EGing PV EG-685NT66-HU/BF-DG is 22.05%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does EGing PV EG-670M66-HUV use vs EGing PV EG-685NT66-HU/BF-DG?
EGing PV EG-670M66-HUV uses PERC cells; EGing PV EG-685NT66-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-670M66-HUV and EGing PV EG-685NT66-HU/BF-DG?
EGing PV EG-670M66-HUV has a 25 years power warranty; EGing PV EG-685NT66-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-HUV and EGing PV EG-685NT66-HU/BF-DG bifacial panels?
EGing PV EG-685NT66-HU/BF-DG is bifacial (captures light from both faces); EGing PV EG-670M66-HUV is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.
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.