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670M66-HU/BF-DG vs 670NT66-HU/BF-DG 16 of 19 identical Swap Change panels

EGing PV EG-670M66-HU/BF-DG vs EGing PV EG-670NT66-HU/BF-DG

EGing PV
EG-670M66-HU/BF-DG
670 Wp 21.56 % PERC Bifacial
Open panel page Datasheet PDF
VS
EGing PV
EG-670NT66-HU/BF-DG
670 Wp 21.56 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

670NT66-HU/BF-DG leads on the differences that matter

The largest is temperature coefficient: 0.040 %/°C better in heat. 16 of 19 comparable parameters are identical.

See all 3 differences
How alike are they
16 of 19 comparable
parameters are identical
identical differs
01

What actually differs

3 of 19 parameters
Parameter 670M66-HU/BF-DG 670NT66-HU/BF-DG Difference
Temperature coefficient -0.340 %/°C -0.300 %/°C 0.040 %/°C better in heat
Cell technology PERC TOPCon PERC vs TOPCon
Annual degradation 0.45 %/yr 0.40 %/yr 0.05 %/yr slower
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-HU/BF-DG
22,064 kWh
670NT66-HU/BF-DG
22,480 kWh
Lifetime gap
416 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario 670M66-HU/BF-DG 670NT66-HU/BF-DG
Standard test conditions 25 °C 100.0% of rated power 670 W 670 W
Cool, bright day 40 °C 94.9% of rated power 636 W 640 W
Typical summer roof 55 °C 89.8% of rated power 602 W 610 W
Hot roof 70 °C 84.7% of rated power 567 W 580 W
03

Full specification

Parameter 670M66-HU/BF-DG 670NT66-HU/BF-DG Difference
Power and efficiency
Rated power 670 Wp 670 Wp Same
Module efficiency 21.56 % 21.56 % Same
Power density 215.7 Wp/m² 215.7 Wp/m² Same
Open-circuit voltage 46.20 V 47.01 V Effectively the same
Voltage at max power 38.38 V 39.21 V Effectively the same
Short-circuit current 18.51 A 18.10 A Effectively the same
Current at max power 17.46 A 17.09 A Effectively the same
Temperature
Temperature coefficient -0.340 %/°C -0.300 %/°C +0.040 %/°C for 670NT66-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 57.2 kg/kWp 57.2 kg/kWp Same
Warranty and degradation
Product warranty 12 yrs 12 yrs Same
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.45 %/yr 0.40 %/yr -0.05 %/yr for 670NT66-HU/BF-DG
Technology
Cell technology PERC TOPCon PERC vs TOPCon
Cell type Monocrystalline Monocrystalline Same
Cell count 132 132 Same
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#7,774 vs #7,774
Tied - the same position in the database
Power density
#7,644 vs #7,644
Tied - the same position in the database
Heat behaviour
#8,778 vs #6,093
670NT66-HU/BF-DG leads by 2,685 places
Weight
#11,112 vs #11,112
Tied - the same position in the database
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,497 vs #2,497
Tied - the same position in the database
05

More useful comparisons

Open the full database
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EGing PV EG-670M66-HU/BF-DG vs EGing PV EG-675NT66-HU/BF-DG
5 differences, the largest is temperature coefficient
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EGing PV EG-670M66-HU/BF-DG vs EGing PV EG-670M66-HUV
5 differences, the largest is performance warranty
Same series, other bin
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EGing PV EG-670M66-HU/BF-DG vs EGing PV EG-665NT66-HU/BF-DG
3 differences, the largest is temperature coefficient
Same series, other bin
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EGing PV EG-670M66-HU/BF-DG vs EGing PV EG-665M66-HU/BF-DG
The same specification on paper
06

Written summary

07

Questions about this pairing

Which panel is better: EGing PV EG-670M66-HU/BF-DG or EGing PV EG-670NT66-HU/BF-DG?
According to our database: EGing PV EG-670NT66-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-HU/BF-DG and EGing PV EG-670NT66-HU/BF-DG?
EGing PV EG-670M66-HU/BF-DG has a module efficiency of 21.56%, while EGing PV EG-670NT66-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-670M66-HU/BF-DG use vs EGing PV EG-670NT66-HU/BF-DG?
EGing PV EG-670M66-HU/BF-DG uses PERC cells; EGing PV EG-670NT66-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-HU/BF-DG and EGing PV EG-670NT66-HU/BF-DG?
EGing PV EG-670M66-HU/BF-DG has a 30 years power warranty; EGing PV EG-670NT66-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-670NT66-HU/BF-DG bifacial panels?
Both EGing PV EG-670M66-HU/BF-DG and EGing PV EG-670NT66-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.