41″ · 1,042 mm wide · 1.57″ (40 mm) frame · 43.4 lb (19.7 kg)

Solar panelLG Electronics

LG Electronics LG405N3K-V6

Name: LG Electronics LG405N3K-V6
Brand: LG Electronics

66 half-cut cells, N-type, bifacial. Power classes 390–410 W in the CEC list; datasheet covers 405–405 W.

CEC listed · Aug 2, 2021UL 61730BifacialN-type

Power class

Power (STC)405 WCEC nameplate
Efficiency≥20.7%datasheet minimum
%/°C Pmax−0.33CEC test: −0.350
Degradation / yr0.33%after year 1 (warranty)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · LG Electronics datasheet · 5 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
LG390N3K-V6	390 W	45.00	11.08	36.40	10.72	≈19.9%	362 W	Aug 2, 2021
LG395N3K-V6	395 W	45.10	11.12	36.80	10.74	≈20.2%	367 W	Aug 2, 2021
LG400N3K-V6	400 W	45.20	11.16	37.20	10.76	≈20.4%	372 W	Aug 2, 2021
LG405N3K-V6	405 W	45.28	11.20	37.60	10.78	≥20.7%	377 W	Aug 2, 2021
LG410N3K-V6	410 W	45.40	11.24	38.00	10.79	≈20.9%	381 W	Aug 2, 2021

≈ efficiency = Pmax ÷ panel area 1.959 m² (datasheet size) for classes outside the datasheet.

Build & dimensions

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

Dimensions74 × 41 × 1.57 in1,880 × 1,042 × 40 mm
Module area1.96 m² (21.1 ft²)length × width
Weight43.4 lb (19.7 kg)
Cells66 half-cut cellsN-type

Heat & cold behaviour

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

	Datasheet	CEC listing test
Pmax coefficient γ	−0.33 %/°C	−0.350 %/°C
Voc coefficient β	−0.26 %/°C	−0.266 %/°C
Isc coefficient α	+0.04 %/°C	+0.034 %/°C
Vmp coefficient	≈ −0.37 %/°C	—
Operating cell temperature	NMOT 42 ± 3 °C	NOCT 46.2 °C

Vmp coefficient ≈ γ − α (datasheet); 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
390 W	287.8 W	34.37 V × 8.37 A	75.1 W	96%
395 W	291.5 W	34.75 V × 8.39 A	76 W	96%
400 W	295.3 W	35.13 V × 8.4 A	77 W	96%
405 W	299 W	35.51 V × 8.42 A	78 W	96%
410 W	302.5 W	35.89 V × 8.43 A	78.9 W	96%

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

Electrical & strength ratings

LG Electronics datasheet

Max system voltage1,000 V
Max series fuse20 A
Fire rating (UL 61730)Class C
Module temperature−40 °F to +185 °F−40 °C to +85 °C

Packaging: 25 per pallet

Certifications

CEC PV Module List (Oct 7, 2026) · LG Electronics datasheet

UL 61730IEC 61215IEC 61730IEC 61701IEC 62716Fire rating Class C (UL 61730)ISO 14001ISO 45001ISO 9001

UL 61730CEC listing
IEC 61215datasheet
IEC 61730datasheet
IEC 61701datasheet
IEC 62716datasheet
Fire rating Class C (UL 61730)datasheet
ISO 14001factory, datasheet
ISO 45001factory, datasheet
ISO 9001factory, datasheet

Warranty & degradation

LG Electronics datasheet

Product warranty25 years
Then≤ 0.33% / year
Year 25≥ 90.6%

Independent reliability testing

Kiwa PVEL Scorecard

PVEL Scorecards

LG Electronics named Top Performer, 2018–2021

This exact series is not listed in published PVEL Top Performer tables. Results below are for the manufacturer.

Inverter compatibility & string sizing

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

CityColdest air, °CHottest cell, °CString inverter

48 V

Voc when cold

per panel

30.8 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.

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	2–12
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–12
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–12
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	8–10

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	48 / 30.8 V	✓ Within range	1.4
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	48 / 30.8 V	✗ Not a match: module voltage below MPPT range	1.07
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	48 / 30.8 V	✓ Within range	0.52
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	48 / 30.8 V	✓ Within range	1.25
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	48 / 30.8 V	⚠ Works; below MPPT at peak heat	1.16

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	679	11,539	6.08
Palmdale	1,835	743	12,634	6.69
Chula Vista	1,696	687	11,677	6.11
Huntington Beach	1,643	665	11,312	5.89
Riverside	1,696	687	11,677	6.21
Santa Clarita	1,724	698	11,870	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 405 W panels

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

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	PVEL (product / brand)	SoCal permits (series)
LG Electronics LG405N3K-V6	405 W	≥20.7%	−0.350	45.28	11.2	brand 2×	—
Qcells Q.PEAK DUO BLK ML-G10+ 405	405 W	≥20.6%	−0.362	45.34	11.17	product 2022, 2023	221
JA Solar JAM54S31-405/MR	405 W	≈21.3%	−0.329	37.23	13.87	product 2023, 2024	152
REC Group REC405AA Pure	405 W	≈22.6%	−0.256	48.9	10.3	brand 9× (2016–2025)	66

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.

Documents

manufacturer documents

PDF
Specification Sheet
Datasheet · LG (LG Electronics / LG Energy Solution) · May 2025

Questions & answers

How efficient is the LG Electronics LG405N3K-V6?

The LG Electronics datasheet guarantees at least 20.7% module efficiency for the 405 W class. 405 W over 1.96 m² equals about 207 W per square meter.

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

PVWatts v8 with typical-year weather gives about 679 kWh per year per 405 W panel in Los Angeles and about 743 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.33 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 17.1% 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 2–12 panels per string (Voc at 2 °C = 48 V, Vmp at 74 °C cell = 30.8 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 48 V vs max input 60 V; Vmp when hot 30.8 V vs MPPT low 29 V; recommended module power 235–440 W. Confirm on the microinverter maker’s compatibility list.

What does the warranty cover?

25 years on the product: at least 90.6% after 25 years (manufacturer datasheet).

How big and heavy is it?

74 × 41 × 1.57 in (1,880 × 1,042 × 40 mm), 43.4 lb (19.7 kg).

Is it bifacial?

Yes. Rear gain depends on mounting height and ground reflectance.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
LG Electronics — datasheet Specification Sheet.
Qcells — manufacturer datasheet “Q.PEAK DUO BLK ML-G10+ ENDURING HIGH PERFORMANCE”.
LG Electronics — document library on the manufacturer’s website (links above).
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2018–2021.
NLR (formerly NREL) — System Advisor Model CEC module and inverter libraries (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).