Illustration · 144 half-cut cells

Solar panelHyundai Energy Solutions

Hyundai Energy Solutions HiS-S435YI

Name: Hyundai Energy Solutions HiS-S435YI
Brand: Hyundai Energy Solutions

144 half-cut cells. Power classes 420–455 W in the CEC list.

CEC listed · Feb 22, 2021UL 61730PVEL Top Performer 2023, 2024

Power class

Power (STC)435 WCEC nameplate
Efficiency≈20.0%calculated from area
%/°C Pmax−0.341CEC listing test
PTC / STC93.7%PTC 408 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 8 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
HiS-S420YI	420 W	48.60	11.04	40.40	10.40	≈19.4%	393 W	Feb 22, 2021
HiS-S425YI	425 W	48.80	11.11	40.60	10.47	≈19.6%	398 W	Feb 22, 2021
HiS-S430YI	430 W	49.00	11.18	40.80	10.54	≈19.8%	403 W	Feb 22, 2021
HiS-S435YI	435 W	49.20	11.25	41.00	10.61	≈20.0%	408 W	Feb 22, 2021
HiS-S440YI	440 W	49.40	11.33	41.20	10.69	≈20.3%	413 W	Feb 22, 2021
HiS-S445YI	445 W	49.60	11.40	41.40	10.76	≈20.5%	417 W	Feb 22, 2021
HiS-S450YI	450 W	49.80	11.47	41.60	10.83	≈20.7%	422 W	Feb 22, 2021
HiS-S455YI	455 W	50.00	11.54	41.80	10.90	≈21.0%	427 W	Apr 21, 2023

≈ efficiency = Pmax ÷ CEC-listed area 2.17 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area2.17 m² (23.4 ft²)CEC-listed area
Cells144 half-cut cells
Back coverWhite backsheet

Heat & cold behaviour

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation

	CEC listing test
Pmax coefficient γ	−0.341 %/°C
Voc coefficient β	−0.264 %/°C
Isc coefficient α	+0.045 %/°C
Operating cell temperature	NOCT 44 °C

Vmp coefficient ≈ γ − α (CEC); used only for the hot-roof voltage estimate.

Away from lab conditions — CEC listing test points

Class	Pmax at NOCT	Vmp × Imp at NOCT	Pmax at 200 W/m²	Low-light efficiency vs STC
420 W	314.9 W	38.16 V × 8.25 A	80.6 W	96%
425 W	318.6 W	38.35 V × 8.31 A	81.5 W	96%
430 W	322.3 W	38.54 V × 8.36 A	82.5 W	96%
435 W	326 W	38.73 V × 8.42 A	83.4 W	96%
440 W	330.1 W	38.91 V × 8.48 A	84.4 W	96%
445 W	333.9 W	39.1 V × 8.54 A	85.4 W	96%
450 W	337.7 W	39.29 V × 8.59 A	86.4 W	96%
455 W	341.5 W	39.48 V × 8.65 A	87.4 W	96%

Pmax = Vmp × Imp from the CEC listing; low-light efficiency = Pmax at 200 W/m² ÷ (20% of STC Pmax).

Certifications

CEC PV Module List (Oct 7, 2026)

UL 61730IEC 61215

UL 61730CEC listing
IEC 61215design qualification on file with CEC · Jan 8, 2021

Independent reliability testing

Kiwa PVEL Scorecard

2023, 2024

PVEL Top Performer

this series

Tests passed as Top Performer

LID+LETID

PVEL Scorecards

Hyundai Energy Solutions named Top Performer, 2017–2025

PVEL Top Performer tests

Year	Product	Tests
2023	HiS-SxxxYI	LID+LETID
2024	HiS-SxxxYI	LID+LETID
2023	HiS-SxxxYI(BK) (closely related product name)	LID+LETID
2024	HiS-SxxxYI(BK) (closely related product name)	LID+LETID

Tested bill of materials

PVEL-tested factorySouth Korea
Cell technology (tested BOM)p-type PERC
Module design (tested BOM)bifacial - glass//backsheet
Power class range tested430-475W

Details describe the tested sample, not every module of the series.

Inverter compatibility & string sizing

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · NLR PVWatts v8 · inverter datasheets · NLR SAM inverter library · CEC Grid Support Inverter List (Oct 7, 2026)

CityColdest air, °CHottest cell, °CString inverter

52.2 V

Voc when cold

per panel

33.2 V

Vmp when hot

per panel

Max panels / string

max DC 600 V

Min panels / string

MPPT from 60 V

Defaults come from NLR TMY weather (coldest hour, hottest modeled cell). Code calculations (NEC 690.7) use the ASHRAE extreme annual minimum, which is usually colder — enter it above. β is the CEC-measured coefficient; NEC 690.7 calculations use the datasheet value.

String inverters most named in SoCal permits

Inverter	Max DC input	MPPT	Window source	Panels per string
Tesla 1538000-xx-y	600 V	60–480 V	datasheet	2–11
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–11
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–11
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	8–9

Microinverters (one per panel)

Microinverter	Recommended module power	Max DC input	MPPT	Voc cold / Vmp hot	Check	DC/AC
Enphase IQ8PLUS-72-2-US	235–440 W	60 V	29–45 V	52.2 / 33.2 V	✓ Within range	1.5
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	52.2 / 33.2 V	✗ Not a match: module voltage below MPPT range	1.14
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	52.2 / 33.2 V	✓ Within range	0.56
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	52.2 / 33.2 V	✓ Within range	1.34
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	52.2 / 33.2 V	✓ Within range	1.25

Voltage check against the microinverter datasheets — confirm the pairing on the manufacturer’s module compatibility list. Rows appear only when the panel’s power is inside the microinverter’s recommended module power range.

SolarEdge and other optimizer-based systems size strings by the optimizer rules — use the manufacturer’s designer. Reference inverters: most named in SoCal permits since Oct 2024.

Expected production in Southern California

NLR PVWatts v8 · Cali-Graf calculation

PanelsCity for chartSystem size

City	kWh / kW / yr	kWh / panel / yr	kWh / system / yr	Sun, kWh/m²/day
Los Angeles	1,676	729	11,665	6.08
Palmdale	1,835	798	12,772	6.69
Chula Vista	1,696	738	11,804	6.11
Huntington Beach	1,643	715	11,435	5.89
Riverside	1,696	738	11,804	6.21
Santa Clarita	1,724	750	11,999	6.28

Estimate for comparison, not a quote: shading, roof orientation and local losses change real output. Roof mount, 20° tilt, south, 14% system losses.

Compare with similar 435 W panels

CEC PV Module List (Oct 7, 2026) · datasheets · Kiwa PVEL Scorecard · building permits

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	Warranty	PVEL (product / brand)	SoCal permits (series)
Hyundai Energy Solutions HiS-S435YI	435 W	≈20%	−0.341	49.2	11.25	—	product 2023, 2024	—
Canadian Solar CS3N-430MS	430 W	≈21.8%	−0.332	45.7	11.86	25 yr	product 2023	46
Qcells Q.TRON BLK M-G2+ 435	435 W	≥22.3%	−0.276	39.6	13.82	25 / 25 yr	brand 11× (2016–2026)	40
Silfab Solar SIL-435QD	435 W	≈22.3%	−0.294	38.94	14.05	25 / 30 yr	brand 7× (2017–2025)	39

Same fields from the same sources for every row; ≈ efficiency is calculated from the listed area. Comparable series: other brands, same product group, power range covering this class.

About Hyundai Energy Solutions

CEC PV Module List (Oct 7, 2026) · Kiwa PVEL Scorecard · building permits

ManufacturerHyundai Energy Solutions
Listed in CEC asHD HYUNDAI ENERGY SOLUTIONS CO., LTD., HYUNDAI ENERGY SOLUTIONS CO., LTD.
Websitehd-hyundaies.co.kr
PVEL Top Performer (manufacturer)5 Scorecards (2017–2025)
Current panel series in CEC list36

Other series by SoCal permits

HiN-TxxxNF(BK) · 37HiS-SxxxYH(BK) · 14HiS-TxxxNF(BK) · 8HiA-SxxxHG · 1HiS-CxxxRG(BK)HiN-TxxxNI

Questions & answers

How efficient is the Hyundai Energy Solutions HiS-S435YI?

Calculated from the panel area (2.17 m²): about 20% for the 435 W class. 435 W over 2.17 m² equals about 200 W per square meter.

How much energy does one panel produce in Los Angeles or Palmdale?

PVWatts v8 with typical-year weather gives about 729 kWh per year per 435 W panel in Los Angeles and about 798 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.341 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 17.7% below the STC rating.

How many panels fit on one string?

With the Tesla 1538000-xx-y (max DC 600 V, MPPT from 60 V, datasheet) in Los Angeles the calculator gives 2–11 panels per string (Voc at 2 °C = 52.2 V, Vmp at 74 °C cell = 33.2 V). Final design must follow the inverter manual and NEC 690.7.

Does it work with Enphase IQ8PLUS-72-2-US microinverters?

Voltage check against the Enphase datasheet: Voc when cold 52.2 V vs max input 60 V; Vmp when hot 33.2 V vs MPPT low 29 V; recommended module power 235–440 W. Confirm on the microinverter maker’s compatibility list.

Has this panel been reliability-tested?

HiS-SxxxYI was a PVEL Top Performer in 2023, 2024 (LID+LETID).

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Canadian Solar — manufacturer datasheet “HiKu Mono PERC CS3N-400|405|410|415|420|425MS MORE POWER”.
Qcells — manufacturer datasheet “Q.TRON BLK M-G2+ SERIES 415–440 Wp”.
Silfab Solar — datasheet NTC SIL-420 QD CELL TECHNOLOGY.
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2017–2025.
NLR (formerly NREL) — System Advisor Model CEC inverter library (version 2026.7.3).
NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Chula Vista, Huntington Beach, Riverside, Santa Clarita.
Inverter datasheets — APsystems (Alt Power System), Enphase, Solis (Ginlong), Tesla (manufacturer documents).
Building permits — Southern California permit portals. Equipment matched from permit descriptions.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).