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T640NJ vs T630NJ 16 of 19 identical Swap Change panels

Hyundai HiS-T640NJ vs Hyundai HiS-T630NJ

HiS-T640NJ
640 Wp 22.90 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
HiS-T630NJ
630 Wp 22.54 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

T640NJ leads on the differences that matter

The largest is module efficiency: 0.36 pp more efficient. 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 T640NJ T630NJ Difference
Module efficiency 22.90 % 22.54 % 0.36 pp more efficient
Power density 229.0 Wp/m² 225.4 Wp/m² 3.6 Wp/m² higher
Rated power 640 Wp 630 Wp 10 W more power
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 (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.
T640NJ
21,473 kWh
T630NJ
21,138 kWh
Lifetime gap
335 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario T640NJ T630NJ
Standard test conditions 25 °C 100.0% of rated power 640 W 630 W
Cool, bright day 40 °C 95.7% of rated power 612 W 603 W
Typical summer roof 55 °C 91.3% of rated power 584 W 575 W
Hot roof 70 °C 87.0% of rated power 556 W 548 W
03

Full specification

Parameter T640NJ T630NJ Difference
Power and efficiency
Rated power 640 Wp 630 Wp +10 W for T640NJ
Module efficiency 22.90 % 22.54 % +0.36 pp for T640NJ
Power density 229.0 Wp/m² 225.4 Wp/m² +3.6 Wp/m² for T640NJ
Open-circuit voltage 57.77 V 57.36 V Effectively the same
Voltage at max power 47.74 V 47.41 V Effectively the same
Short-circuit current 14.06 A 13.90 A Effectively the same
Current at max power 13.41 A 13.29 A Effectively the same
Temperature
Temperature coefficient -0.290 %/°C -0.290 %/°C Same
Mechanical
Dimensions 2465x1134x30 mm 2465x1134x30 mm Same
Module area 2.795 m² 2.795 m² Same
Weight 34.7 kg 34.7 kg Same
Weight per kWp 54.2 kg/kWp 55.1 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 0.40 %/yr Same
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 156 156 Same
Bifacial Yes Yes Same
04

Against the whole database

14,129 panels
Efficiency
#2,412 vs #3,979
T640NJ leads by 1,567 places
Power density
#2,443 vs #3,966
T640NJ leads by 1,523 places
Heat behaviour
#2,220 vs #2,220
Tied - the same position in the database
Weight
#8,527 vs #9,577
T640NJ leads by 1,050 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,117 vs #2,735
T640NJ leads by 618 places
05

More useful comparisons

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16 differences, the largest is temperature coefficient
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Hyundai HiS-T640NJ vs Hyundai HiT-H515LF-FB(ZB)
14 differences, the largest is temperature coefficient
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Hyundai HiS-T640NJ vs Hyundai HiT-H510LF-FB(ZB)
13 differences, the largest is temperature coefficient
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Hyundai HiS-T640NJ vs Hyundai HiT-H505LF-FB(ZB)
14 differences, the largest is temperature coefficient
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Hyundai HiS-T640NJ vs Hyundai HiT-H500LF-FB(ZB)
15 differences, the largest is temperature coefficient
06

Written summary

07

Questions about this pairing

Which panel is better: Hyundai HiS-T640NJ or Hyundai HiS-T630NJ?
According to our database: Hyundai HiS-T640NJ has higher module efficiency (22.90% vs 22.54%). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Hyundai HiS-T640NJ and Hyundai HiS-T630NJ?
Hyundai HiS-T640NJ has a module efficiency of 22.90%, while Hyundai HiS-T630NJ is 22.54%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Hyundai HiS-T640NJ use vs Hyundai HiS-T630NJ?
Hyundai HiS-T640NJ uses TOPCon cells; Hyundai HiS-T630NJ 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 Hyundai HiS-T640NJ and Hyundai HiS-T630NJ?
Hyundai HiS-T640NJ has a 30 years power warranty; Hyundai HiS-T630NJ 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 Hyundai HiS-T640NJ and Hyundai HiS-T630NJ bifacial panels?
Both Hyundai HiS-T640NJ and Hyundai HiS-T630NJ 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.