S390VG vs S405VG 14 of 18 identical Swap Change panels

Hyundai HIE-S390VG vs Hyundai HIE-S405VG

Q: Which panel is better: Hyundai HIE-S390VG or Hyundai HIE-S405VG?

According to our database: Hyundai HIE-S405VG has higher module efficiency (20.70% 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-S390VG and Hyundai HIE-S405VG?

Hyundai HIE-S390VG has a module efficiency of 19.90%, while Hyundai HIE-S405VG is 20.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

Q: What cell technology does Hyundai HIE-S390VG use vs Hyundai HIE-S405VG?

Hyundai HIE-S390VG uses PERC cells; Hyundai HIE-S405VG 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-S390VG and Hyundai HIE-S405VG?

Hyundai HIE-S390VG has a 25 years power warranty; Hyundai HIE-S405VG 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-S390VG

390 Wp 19.90 % PERC

Open panel page Datasheet PDF

HIE-S405VG

405 Wp 20.70 % PERC

Open panel page Datasheet PDF

The verdict

S405VG leads on the differences that matter

The largest is module efficiency: 0.80 pp more efficient. 14 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 4 differences

How alike are they

14 of 18 comparable
parameters are identical

identical differs not published

What actually differs

4 of 18 parameters

Parameter S390VG S405VG Difference

Module efficiency 19.90 % 20.70 % 0.80 pp more efficient

Power density 199.0 Wp/m² 206.7 Wp/m² 7.7 Wp/m² higher

Rated power 390 Wp 405 Wp 15 W more power

Weight per kWp 56.4 kg/kWp 54.3 kg/kWp 2.1 kg/kWp lighter

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.

S390VG

12,640 kWh

S405VG

13,126 kWh

Lifetime gap

486 kWh

Output when it is hot

Rated power carried across the range a module actually sees

Scenario S390VG S405VG

Standard test conditions 25 °C 100.0% of rated power 390 W 405 W

Cool, bright day 40 °C 94.9% of rated power 370 W 384 W

Typical summer roof 55 °C 89.8% of rated power 350 W 364 W

Hot roof 70 °C 84.7% of rated power 330 W 343 W

Full specification

Parameter S390VG S405VG Difference

Power and efficiency

Rated power 390 Wp 405 Wp +15 W for S405VG

Module efficiency 19.90 % 20.70 % +0.80 pp for S405VG

Power density 199.0 Wp/m² 206.7 Wp/m² +7.7 Wp/m² for S405VG

Open-circuit voltage 46.30 V 46.50 V Effectively the same

Voltage at max power 38.50 V 38.70 V Effectively the same

Short-circuit current 10.87 A 11.02 A Effectively the same

Current at max power 10.13 A 10.47 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 56.4 kg/kWp 54.3 kg/kWp -2.1 kg/kWp for S405VG

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

#12,416 vs #10,842

S405VG leads by 1,574 places

Power density

#12,416 vs #11,043

S405VG leads by 1,373 places

Heat behaviour

#8,846 vs #8,846

Tied - the same position in the database

Weight

#10,727 vs #8,666

S405VG leads by 2,061 places

Warranty

#9,912 vs #9,912

Tied - the same position in the database

Overall

#11,364 vs #10,549

S405VG leads by 815 places

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Written summary

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Questions about this pairing

Which panel is better: Hyundai HIE-S390VG or Hyundai HIE-S405VG?

According to our database: Hyundai HIE-S405VG has higher module efficiency (20.70% 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-S390VG and Hyundai HIE-S405VG?

Hyundai HIE-S390VG has a module efficiency of 19.90%, while Hyundai HIE-S405VG is 20.70%. Higher efficiency means more electricity from the same roof area - useful when space is limited.

What cell technology does Hyundai HIE-S390VG use vs Hyundai HIE-S405VG?

Hyundai HIE-S390VG uses PERC cells; Hyundai HIE-S405VG 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-S390VG and Hyundai HIE-S405VG?

Hyundai HIE-S390VG has a 25 years power warranty; Hyundai HIE-S405VG 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.