HiS-T640NJ vs HiE-S440HG(FB) 1 of 18 identical Swap Change panels

Hyundai HiS-T640NJ vs Hyundai HiE-S440HG(FB)

Q: Which panel is better: Hyundai HiS-T640NJ or Hyundai HiE-S440HG(FB)?

According to our database: Hyundai HiS-T640NJ has higher module efficiency (22.90% vs 21.10%); Hyundai HiS-T640NJ tolerates heat better (temp coeff -0.290%/°C vs -0.340%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.

Q: What is the efficiency of Hyundai HiS-T640NJ and Hyundai HiE-S440HG(FB)?

Hyundai HiS-T640NJ has a module efficiency of 22.90%, while Hyundai HiE-S440HG(FB) is 21.10%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does Hyundai HiS-T640NJ use vs Hyundai HiE-S440HG(FB)?

Hyundai HiS-T640NJ uses TOPCon cells; Hyundai HiE-S440HG(FB) uses PERC. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.

Q: What is the warranty on Hyundai HiS-T640NJ and Hyundai HiE-S440HG(FB)?

Hyundai HiS-T640NJ has a 30 years power warranty; Hyundai HiE-S440HG(FB) 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.

Q: Are Hyundai HiS-T640NJ and Hyundai HiE-S440HG(FB) bifacial panels?

Hyundai HiS-T640NJ is bifacial (captures light from both faces); Hyundai HiE-S440HG(FB) is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

HiS-T640NJ

640 Wp 22.90 % TOPCon Bifacial

Open panel page Datasheet PDF

HiE-S440HG(FB)

440 Wp 21.10 % PERC

Open panel page Datasheet PDF

The verdict

HiS-T640NJ leads on the differences that matter

The largest is module efficiency: 1.80 pp more efficient. 1 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 17 differences

How alike are they

1 of 18 comparable
parameters are identical

identical differs not published

What actually differs

17 of 18 parameters

Parameter HiS-T640NJ HiE-S440HG(FB) Difference

Module efficiency 22.90 % 21.10 % 1.80 pp more efficient

Temperature coefficient -0.290 %/°C -0.340 %/°C 0.050 %/°C better in heat

Rated power 640 Wp 440 Wp 200 W more power

Power density 229.0 Wp/m² 211.4 Wp/m² 17.5 Wp/m² higher

Performance warranty 30 yrs 25 yrs 5 yrs longer

Annual degradation 0.40 %/yr 0.55 %/yr 0.15 %/yr slower

Weight 34.7 kg 21.8 kg 12.9 kg lighter

Product warranty 12 yrs 25 yrs 13 yrs longer

Open-circuit voltage 57.77 V 43.70 V 14.07 V apart

Module area 2.795 m² 2.081 m² 0.714 m² apart

Weight per kWp 54.2 kg/kWp 49.5 kg/kWp 4.7 kg/kWp lighter

Cell technology TOPCon PERC TOPCon vs PERC

Short-circuit current 14.06 A 12.90 A 1.16 A apart

Voltage at max power 47.74 V 36.30 V 11.44 V apart

Bifacial Yes No Yes vs No

Current at max power 13.41 A 12.13 A 1.28 A apart

Dimensions 2465x1134x30 mm 1899x1096x30 mm 2465x1134x30 mm vs 1899x1096x30 mm

What it means on a roof

Thirty years of production

Each panel's own declared degradation curve, at 1,200 kWh/kWp a year

Cell temperature

HiS-T640NJ

21,473 kWh

HiE-S440HG(FB)

14,260 kWh

Lifetime gap

7,213 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario HiS-T640NJ HiE-S440HG(FB)

Standard test conditions 25 °C 100.0% of rated power 640 W 440 W

Cool, bright day 40 °C 94.9% of rated power 612 W 418 W

Typical summer roof 55 °C 89.8% of rated power 584 W 395 W

Hot roof 70 °C 84.7% of rated power 556 W 373 W

Full specification

Parameter HiS-T640NJ HiE-S440HG(FB) Difference

Power and efficiency

Rated power 640 Wp 440 Wp +200 W for HiS-T640NJ

Module efficiency 22.90 % 21.10 % +1.80 pp for HiS-T640NJ

Power density 229.0 Wp/m² 211.4 Wp/m² +17.5 Wp/m² for HiS-T640NJ

Open-circuit voltage 57.77 V 43.70 V 14.07 V apart

Voltage at max power 47.74 V 36.30 V 11.44 V apart

Short-circuit current 14.06 A 12.90 A 1.16 A apart

Current at max power 13.41 A 12.13 A 1.28 A apart

Temperature

Temperature coefficient -0.290 %/°C -0.340 %/°C +0.050 %/°C for HiS-T640NJ

Mechanical

Dimensions 2465x1134x30 mm 1899x1096x30 mm 2465x1134x30 mm vs 1899x1096x30 mm

Module area 2.795 m² 2.081 m² 0.714 m² apart

Weight 34.7 kg 21.8 kg -12.9 kg for HiE-S440HG(FB)

Weight per kWp 54.2 kg/kWp 49.5 kg/kWp -4.7 kg/kWp for HiE-S440HG(FB)

Warranty and degradation

Product warranty 12 yrs 25 yrs +13 yrs for HiE-S440HG(FB)

Performance warranty 30 yrs 25 yrs +5 yrs for HiS-T640NJ

Annual degradation 0.40 %/yr 0.55 %/yr -0.15 %/yr for HiS-T640NJ

Technology

Cell technology TOPCon PERC TOPCon vs PERC

Cell type Monocrystalline Monocrystalline Same

Cell count 156 - Not published by Hyundai

Bifacial Yes No Yes vs No

Against the whole database

14,129 panels

Efficiency

#2,412 vs #9,365

HiS-T640NJ leads by 6,953 places

Power density

#2,443 vs #9,276

HiS-T640NJ leads by 6,833 places

Heat behaviour

#2,220 vs #8,846

HiS-T640NJ leads by 6,626 places

Weight

#8,527 vs #3,118

HiE-S440HG(FB) leads by 5,409 places

Warranty

#21 vs #9,912

HiS-T640NJ leads by 9,891 places

Overall

#2,117 vs #9,385

HiS-T640NJ leads by 7,268 places

More useful comparisons

Open the full database

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The same specification on paper

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Hyundai HiS-T640NJ vs Hyundai HiS-T630NJ

3 differences, the largest is module efficiency

Same series, other bin

Hyundai HiE-S440HG(FB) vs Hyundai HiE-S445HG

One difference: module efficiency

Same series, other bin

Hyundai HiE-S440HG(FB) vs Hyundai HiE-S445HG(FB)

One difference: module efficiency

Same series, other bin

Hyundai HiE-S440HG(FB) vs Hyundai HiE-S440HG

The same specification on paper

Same series, other bin

Hyundai HiE-S440HG(FB) vs Hyundai HiE-S435HG

One difference: module efficiency

Written summary

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Questions about this pairing

Which panel is better: Hyundai HiS-T640NJ or Hyundai HiE-S440HG(FB)?

According to our database: Hyundai HiS-T640NJ has higher module efficiency (22.90% vs 21.10%); Hyundai HiS-T640NJ tolerates heat better (temp coeff -0.290%/°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 Hyundai HiS-T640NJ and Hyundai HiE-S440HG(FB)?

Hyundai HiS-T640NJ has a module efficiency of 22.90%, while Hyundai HiE-S440HG(FB) is 21.10%. 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 HiE-S440HG(FB)?

Hyundai HiS-T640NJ uses TOPCon cells; Hyundai HiE-S440HG(FB) 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 Hyundai HiS-T640NJ and Hyundai HiE-S440HG(FB)?

Hyundai HiS-T640NJ has a 30 years power warranty; Hyundai HiE-S440HG(FB) 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 Hyundai HiS-T640NJ and Hyundai HiE-S440HG(FB) bifacial panels?

Hyundai HiS-T640NJ is bifacial (captures light from both faces); Hyundai HiE-S440HG(FB) is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath.

Shop prices: See 30 Hyundai 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.