40″ · 1,016 mm wide · 1.57″ (40 mm) frame · 39.7 lb (18 kg)

Solar panelLG Electronics

LG Electronics LG340N1K-L5

Name: LG Electronics LG340N1K-L5
Brand: LG Electronics

60 cells, N-type. Power classes 310–355 W in the CEC list.

CEC listed · Jan 2, 2020UL 6173025-yr product + 25-yr performance warrantyN-typeSeen in 1 SoCal permit

Power class

Power (STC)340 WCEC nameplate
Efficiency≈19.7%calculated from area
%/°C Pmax−0.35CEC test: −0.343
Degradation / yr0.33%after year 1 (warranty)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 10 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
LG310N1K-L5	310 W	40.30	10.36	31.20	9.94	≈17.9%	288 W	Jan 2, 2020
LG315N1K-L5	315 W	40.40	10.40	31.60	9.97	≈18.2%	293 W	Jan 2, 2020
LG320N1K-L5	320 W	40.50	10.44	32.00	10.01	≈18.5%	297 W	Jan 2, 2020
LG325N1K-L5	325 W	40.60	10.48	32.40	10.04	≈18.8%	302 W	Jan 2, 2020
LG330N1K-L5	330 W	40.70	10.52	32.80	10.07	≈19.1%	307 W	Jan 2, 2020
LG335N1K-L5	335 W	40.80	10.56	33.20	10.10	≈19.4%	312 W	Jan 2, 2020
LG340N1K-L5	340 W	40.90	10.60	33.60	10.12	≈19.7%	316 W	Jan 2, 2020
LG345N1K-L5	345 W	41.00	10.64	34.00	10.15	≈20.0%	321 W	Jan 2, 2020
LG350N1K-L5	350 W	41.10	10.68	34.40	10.18	≈20.3%	326 W	Jan 2, 2020
LG355N1K-L5	355 W	41.20	10.72	34.80	10.21	≈20.6%	331 W	Jan 2, 2020

≈ efficiency = Pmax ÷ panel area 1.727 m² (datasheet size).

Build & dimensions

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

Dimensions66.9 × 40 × 1.57 in1,700 × 1,016 × 40 mm
Module area1.73 m² (18.6 ft²)length × width
Weight39.7 lb (18 kg)
Cells60 cellsN-type
Back coverBlack backsheet
FrameBlack frame

Heat & cold behaviour

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

	Datasheet	CEC listing test
Pmax coefficient γ	−0.35 %/°C	−0.343 %/°C
Voc coefficient β	−0.26 %/°C	−0.258 %/°C
Isc coefficient α	+0.03 %/°C	+0.025 %/°C
Vmp coefficient	≈ −0.38 %/°C	—
Operating cell temperature	NMOT 42 ± 3 °C	NOCT 45.8 °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
310 W	233.7 W	30.22 V × 7.74 A	60.9 W	98%
315 W	237.5 W	30.6 V × 7.76 A	61.9 W	98%
320 W	241.4 W	30.99 V × 7.79 A	62.9 W	98%
325 W	245.2 W	31.38 V × 7.81 A	63.9 W	98%
330 W	248.9 W	31.77 V × 7.84 A	64.9 W	98%
335 W	252.7 W	32.15 V × 7.86 A	65.9 W	98%
340 W	256.3 W	32.54 V × 7.88 A	66.8 W	98%
345 W	260.1 W	32.93 V × 7.9 A	67.8 W	98%
350 W	263.9 W	33.31 V × 7.92 A	68.8 W	98%
355 W	267.8 W	33.7 V × 7.95 A	69.8 W	98%

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)Type 2
Module temperature−40 °F to +194 °F−40 °C to +90 °C
Hail25 mm (0.98 in) at 23 km/h

Packaging: 25 per pallet

Certifications

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

UL 61730UL 1703IEC 61215IEC 61730IEC 61701IEC 62716Fire rating Type 2 (UL 61730)ISO 14001ISO 45001ISO 9001

UL 61730CEC listing
UL 1703datasheet
IEC 61215datasheet
IEC 61730datasheet
IEC 61701datasheet
IEC 62716datasheet
Fire rating Type 2 (UL 61730)datasheet
ISO 14001factory, datasheet
ISO 45001factory, datasheet
ISO 9001factory, datasheet

Warranty & degradation

LG Electronics datasheet · Cali-Graf calculation

Product warranty25 years
Performance warranty25 years
Year 1≥ 98%
Then≤ 0.33% / year
Year 10≥ 95.03%calculated from warranty terms
Year 25≥ 90.1%

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

43.3 V

Voc when cold

per panel

27.3 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	3–13
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–13
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–13
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	9–11

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	43.3 / 27.3 V	⚠ Works; below MPPT at peak heat	1.17
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	43.3 / 27.3 V	✗ Not a match: module voltage below MPPT range	0.89
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	43.3 / 27.3 V	⚠ Works; below MPPT at peak heat	0.44
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	43.3 / 27.3 V	⚠ Works; below MPPT at peak heat	1.05
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	43.3 / 27.3 V	⚠ Works; below MPPT at peak heat	0.97

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	570	11,967	6.08
Palmdale	1,835	624	13,102	6.69
Chula Vista	1,696	577	12,109	6.11
Huntington Beach	1,643	559	11,731	5.89
Riverside	1,696	577	12,109	6.21
Santa Clarita	1,724	586	12,309	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 340 W panels

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

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	PVEL (product / brand)	SoCal permits (series)
LG Electronics LG340N1K-L5	340 W	≈19.7%	−0.343	40.9	10.6	brand 2×	1
LONGi LR4-60HPB-340M	340 W	≈18.8%	−0.337	40.1	10.84	product 2021, 2022	193
JinkoSolar JKM340M-60HBL	340 W	≈20.1%	−0.406	41	10.82	brand 12× (2014–2026)	45
REC Group REC340AA	340 W	≈20.2%	−0.279	43.1	10.09	brand 9× (2016–2025)	30

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.

Questions & answers

How efficient is the LG Electronics LG340N1K-L5?

Calculated from the panel area (1.73 m²): about 19.7% for the 340 W class. 340 W over 1.73 m² equals about 197 W per square meter.

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

PVWatts v8 with typical-year weather gives about 570 kWh per year per 340 W panel in Los Angeles and about 624 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.35 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 18.1% 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 3–13 panels per string (Voc at 2 °C = 43.3 V, Vmp at 74 °C cell = 27.3 V). Final design must follow the inverter manual and NEC 690.7.

What does the warranty cover?

25 years on the product and 25 years on performance: at least 98% of rated power in year 1, then no more than 0.33% per year — at least 90.1% after 25 years (manufacturer datasheet).

How big and heavy is it?

66.9 × 40 × 1.57 in (1,700 × 1,016 × 40 mm), 39.7 lb (18 kg).

Has this panel been reliability-tested?

This exact series is not in published PVEL Top Performer tables; LG Electronics was named a Top Performer in 2 Scorecards (2018–2021).

What fire rating does it have?

UL 61730 fire rating Type 2 per datasheet.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
LG Electronics — manufacturer datasheet “LG340N1K-L5 LG345N1K-L5 LG350N1K-L5”.
JinkoSolar — datasheet THE MOST DEPENDABLE SOLAR BRAND.
JinkoSolar — manufacturer datasheet “Eagle HC 60M G2 315-335 Watt MONO PERC HALF CELL MODULE”.
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2018–2021.
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 — Los Angeles County Public Works (EPIC-LA, unincorporated areas) (Jan 2023). Equipment matched from permit descriptions by model number.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).