S400VG vs S390VG 15 of 18 identical Swap Change panels

Hyundai HIE-S400VG vs Hyundai HIE-S390VG

Q: Which panel is better: Hyundai HIE-S400VG or Hyundai HIE-S390VG?

According to our database: Hyundai HIE-S400VG has higher module efficiency (20.40% vs 19.90%). See the full spec comparison and 30-year energy simulation above for a complete picture.

Q: What is the efficiency of Hyundai HIE-S400VG and Hyundai HIE-S390VG?

Hyundai HIE-S400VG has a module efficiency of 20.40%, while Hyundai HIE-S390VG is 19.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does Hyundai HIE-S400VG use vs Hyundai HIE-S390VG?

Hyundai HIE-S400VG uses PERC cells; Hyundai HIE-S390VG 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 HIE-S400VG and Hyundai HIE-S390VG?

Hyundai HIE-S400VG has a 25 years power warranty; Hyundai HIE-S390VG 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.

HIE-S400VG

400 Wp 20.40 % PERC

Open panel page Datasheet PDF

HIE-S390VG

390 Wp 19.90 % PERC

Open panel page Datasheet PDF

The verdict

S400VG leads on the differences that matter

The largest is module efficiency: 0.50 pp more efficient. 15 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 3 differences

How alike are they

15 of 18 comparable
parameters are identical

identical differs not published

What actually differs

3 of 18 parameters

Parameter S400VG S390VG Difference

Module efficiency 20.40 % 19.90 % 0.50 pp more efficient

Power density 204.1 Wp/m² 199.0 Wp/m² 5.1 Wp/m² higher

Rated power 400 Wp 390 Wp 10 W more power

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

Same temp coeff. for both panels (-0.340 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other.

S400VG

12,964 kWh

S390VG

12,640 kWh

Lifetime gap

324 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario S400VG S390VG

Standard test conditions 25 °C 100.0% of rated power 400 W 390 W

Cool, bright day 40 °C 94.9% of rated power 380 W 370 W

Typical summer roof 55 °C 89.8% of rated power 359 W 350 W

Hot roof 70 °C 84.7% of rated power 339 W 330 W

Full specification

Parameter S400VG S390VG Difference

Power and efficiency

Rated power 400 Wp 390 Wp +10 W for S400VG

Module efficiency 20.40 % 19.90 % +0.50 pp for S400VG

Power density 204.1 Wp/m² 199.0 Wp/m² +5.1 Wp/m² for S400VG

Open-circuit voltage 46.40 V 46.30 V Effectively the same

Voltage at max power 38.60 V 38.50 V Effectively the same

Short-circuit current 10.97 A 10.87 A Effectively the same

Current at max power 10.36 A 10.13 A Effectively the same

Temperature

Temperature coefficient -0.340 %/°C -0.340 %/°C Same

Mechanical

Dimensions 1719x1140x35 mm 1719x1140x35 mm Same

Module area 1.960 m² 1.960 m² Same

Weight 22.0 kg 22.0 kg Same

Weight per kWp 55.0 kg/kWp 56.4 kg/kWp Effectively the same

Warranty and degradation

Product warranty 25 yrs 25 yrs Same

Performance warranty 25 yrs 25 yrs Same

Annual degradation 0.55 %/yr 0.55 %/yr Same

Technology

Cell technology PERC PERC Same

Cell type Monocrystalline Monocrystalline Same

Cell count - - Neither datasheet publishes this

Bifacial No No Same

Against the whole database

14,129 panels

Efficiency

#11,680 vs #12,416

S400VG leads by 736 places

Power density

#11,678 vs #12,416

S400VG leads by 738 places

Heat behaviour

#8,846 vs #8,846

Tied - the same position in the database

Weight

#9,445 vs #10,727

S400VG leads by 1,282 places

Warranty

#9,912 vs #9,912

Tied - the same position in the database

Overall

#10,832 vs #11,364

S400VG leads by 532 places

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Written summary

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Questions about this pairing

Which panel is better: Hyundai HIE-S400VG or Hyundai HIE-S390VG?

According to our database: Hyundai HIE-S400VG has higher module efficiency (20.40% vs 19.90%). See the full spec comparison and 30-year energy simulation above for a complete picture.

What is the efficiency of Hyundai HIE-S400VG and Hyundai HIE-S390VG?

Hyundai HIE-S400VG has a module efficiency of 20.40%, while Hyundai HIE-S390VG is 19.90%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

What cell technology does Hyundai HIE-S400VG use vs Hyundai HIE-S390VG?

Hyundai HIE-S400VG uses PERC cells; Hyundai HIE-S390VG 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 HIE-S400VG and Hyundai HIE-S390VG?

Hyundai HIE-S400VG has a 25 years power warranty; Hyundai HIE-S390VG 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.

Shop prices: See 29 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.