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HiS-T635NJ vs HiT-H520LF-FB(ZB) 3 of 19 identical Swap Change panels

Hyundai HiS-T635NJ vs Hyundai HiT-H520LF-FB(ZB)

HiS-T635NJ
635 Wp 22.72 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
HiT-H520LF-FB(ZB)
520 Wp 23.40 % HJT Bifacial
Open panel page Datasheet PDF
The verdict

HiT-H520LF-FB(ZB) leads on the differences that matter

The largest is temperature coefficient: 0.050 %/°C better in heat. 3 of 19 comparable parameters are identical.

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

What actually differs

16 of 19 parameters
Parameter HiS-T635NJ HiT-H520LF-FB(ZB) Difference
Temperature coefficient -0.290 %/°C -0.240 %/°C 0.050 %/°C better in heat
Module efficiency 22.72 % 23.40 % 0.68 pp more efficient
Rated power 635 Wp 520 Wp 115 W more power
Weight 34.7 kg 27.1 kg 7.6 kg lighter
Product warranty 12 yrs 30 yrs 18 yrs longer
Power density 227.2 Wp/m² 234.0 Wp/m² 6.8 Wp/m² higher
Annual degradation 0.40 %/yr 0.30 %/yr 0.10 %/yr slower
Open-circuit voltage 57.56 V 41.20 V 16.36 V apart
Module area 2.795 m² 2.223 m² 0.573 m² apart
Short-circuit current 13.98 A 15.92 A 1.94 A apart
Cell technology TOPCon HJT TOPCon vs HJT
Voltage at max power 47.57 V 34.60 V 12.97 V apart
Cell count 156 108 48 cells apart
Weight per kWp 54.6 kg/kWp 52.1 kg/kWp 2.5 kg/kWp lighter
Current at max power 13.35 A 15.04 A 1.69 A apart
Dimensions 2465x1134x30 mm 1960x1134x30 mm 2465x1134x30 mm vs 1960x1134x30 mm
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
HiS-T635NJ
21,306 kWh
HiT-H520LF-FB(ZB)
17,718 kWh
Lifetime gap
3,588 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario HiS-T635NJ HiT-H520LF-FB(ZB)
Standard test conditions 25 °C 100.0% of rated power 635 W 520 W
Cool, bright day 40 °C 95.7% of rated power 607 W 501 W
Typical summer roof 55 °C 91.3% of rated power 580 W 483 W
Hot roof 70 °C 87.0% of rated power 552 W 464 W
03

Full specification

Parameter HiS-T635NJ HiT-H520LF-FB(ZB) Difference
Power and efficiency
Rated power 635 Wp 520 Wp +115 W for HiS-T635NJ
Module efficiency 22.72 % 23.40 % +0.68 pp for HiT-H520LF-FB(ZB)
Power density 227.2 Wp/m² 234.0 Wp/m² +6.8 Wp/m² for HiT-H520LF-FB(ZB)
Open-circuit voltage 57.56 V 41.20 V 16.36 V apart
Voltage at max power 47.57 V 34.60 V 12.97 V apart
Short-circuit current 13.98 A 15.92 A 1.94 A apart
Current at max power 13.35 A 15.04 A 1.69 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.240 %/°C +0.050 %/°C for HiT-H520LF-FB(ZB)
Mechanical
Dimensions 2465x1134x30 mm 1960x1134x30 mm 2465x1134x30 mm vs 1960x1134x30 mm
Module area 2.795 m² 2.223 m² 0.573 m² apart
Weight 34.7 kg 27.1 kg -7.6 kg for HiT-H520LF-FB(ZB)
Weight per kWp 54.6 kg/kWp 52.1 kg/kWp -2.5 kg/kWp for HiT-H520LF-FB(ZB)
Warranty and degradation
Product warranty 12 yrs 30 yrs +18 yrs for HiT-H520LF-FB(ZB)
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr 0.30 %/yr -0.10 %/yr for HiT-H520LF-FB(ZB)
Technology
Cell technology TOPCon HJT TOPCon vs HJT
Cell type Monocrystalline Monocrystalline Same
Cell count 156 108 48 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#3,245 vs #882
HiT-H520LF-FB(ZB) leads by 2,363 places
Power density
#3,252 vs #898
HiT-H520LF-FB(ZB) leads by 2,354 places
Heat behaviour
#2,165 vs #13
HiT-H520LF-FB(ZB) leads by 2,152 places
Weight
#9,020 vs #5,593
HiT-H520LF-FB(ZB) leads by 3,427 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#2,358 vs #1,953
HiT-H520LF-FB(ZB) leads by 405 places
05

More useful comparisons

Open the full database
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Hyundai HiT-H520LF-FB(ZB) vs Hyundai HiT-H515LF-FB(ZB)
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Hyundai HiT-H520LF-FB(ZB) vs Hyundai HiT-H510LF-FB(ZB)
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Hyundai HiT-H520LF-FB(ZB) vs Hyundai HiT-H505LF-FB(ZB)
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Hyundai HiT-H520LF-FB(ZB) vs Hyundai HiT-H500LF-FB(ZB)
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06

Written summary

07

Questions about this pairing

Which panel is better: Hyundai HiS-T635NJ or Hyundai HiT-H520LF-FB(ZB)?
According to our database: Hyundai HiT-H520LF-FB(ZB) has higher module efficiency (23.40% vs 22.72%); Hyundai HiT-H520LF-FB(ZB) tolerates heat better (temp coeff -0.240%/°C vs -0.290%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of Hyundai HiS-T635NJ and Hyundai HiT-H520LF-FB(ZB)?
Hyundai HiS-T635NJ has a module efficiency of 22.72%, while Hyundai HiT-H520LF-FB(ZB) is 23.40%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does Hyundai HiS-T635NJ use vs Hyundai HiT-H520LF-FB(ZB)?
Hyundai HiS-T635NJ uses TOPCon cells; Hyundai HiT-H520LF-FB(ZB) uses HJT. 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-T635NJ and Hyundai HiT-H520LF-FB(ZB)?
Hyundai HiS-T635NJ has a 30 years power warranty; Hyundai HiT-H520LF-FB(ZB) 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-T635NJ and Hyundai HiT-H520LF-FB(ZB) bifacial panels?
Both Hyundai HiS-T635NJ and Hyundai HiT-H520LF-FB(ZB) 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.