EGing PV EG-685NT66-HU/BF-DG vs EGing PV EG-670M66-HUV
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
685NT66-HU/BF-DG
670M66-HUV
Difference
Temperature coefficient
-0.300 %/°C
-0.340 %/°C
0.040 %/°C better in heat
Performance warranty
30 yrs
25 yrs
5 yrs longer
Module efficiency
22.05 %
21.56 %
0.49 pp more efficient
Annual degradation
0.40 %/yr
0.55 %/yr
0.15 %/yr slower
Weight
38.3 kg
32.9 kg
5.4 kg lighter
Weight per kWp
55.9 kg/kWp
49.1 kg/kWp
6.8 kg/kWp lighter
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
Open-circuit voltage
47.64 V
45.97 V
1.67 V apart
Bifacial
Yes
No
Yes vs No
Voltage at max power
39.85 V
38.16 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
685NT66-HU/BF-DG
22,983 kWh
670M66-HUV
21,714 kWh
Lifetime gap
1,269 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario
685NT66-HU/BF-DG
670M66-HUV
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-HUV
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
45.97 V
1.67 V apart
Voltage at max power
39.85 V
38.16 V
1.69 V apart
Short-circuit current
18.22 A
18.61 A
Effectively the same
Current at max power
17.19 A
17.56 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
32.9 kg
-5.4 kg for 670M66-HUV
Weight per kWp
55.9 kg/kWp
49.1 kg/kWp
-6.8 kg/kWp for 670M66-HUV
Warranty and degradation
Product warranty
12 yrs
12 yrs
Same
Performance warranty
30 yrs
25 yrs
+5 yrs for 685NT66-HU/BF-DG
Annual degradation
0.40 %/yr
0.55 %/yr
-0.15 %/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
No
Yes vs No
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
#2,745
670M66-HUV leads by 7,531 places
Warranty
#21
vs
#9,798
685NT66-HU/BF-DG leads by 9,777 places
Overall
#1,726
vs
#3,378
685NT66-HU/BF-DG leads by 1,652 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-HUV?
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-HUV?
EGing PV EG-685NT66-HU/BF-DG has a module efficiency of 22.05%, while EGing PV EG-670M66-HUV 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-HUV?
EGing PV EG-685NT66-HU/BF-DG uses TOPCon cells; EGing PV EG-670M66-HUV 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-HUV?
EGing PV EG-685NT66-HU/BF-DG has a 30 years power warranty; EGing PV EG-670M66-HUV has a 25 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-HUV 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.