LG Electronics LG345M1K-L5

Name: LG Electronics LG345M1K-L5
Brand: LG Electronics

60 cells. Power classes 340–350 W in the CEC list.

CEC listed · Aug 21, 2020UL 1741AC module · built-in microinverter

Power class

Power (STC)345 WCEC nameplate
Efficiency≈20.0%calculated from area
%/°C Pmax−0.343CEC listing test
PTC / STC93.1%PTC 321 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 3 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
LG340M1K-L5	340 W	40.90	10.60	33.60	10.12	≈19.7%	316 W	Aug 21, 2020
LG345M1K-L5	345 W	41.00	10.64	34.00	10.15	≈20.0%	321 W	Aug 21, 2020
LG350M1K-L5	350 W	41.10	10.68	34.40	10.18	≈20.3%	326 W	Aug 21, 2020

≈ efficiency = Pmax ÷ CEC-listed area 1.73 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area1.73 m² (18.6 ft²)CEC-listed area
Cells60 cells
Back coverWhite backsheet

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.343 %/°C
Voc coefficient β	−0.258 %/°C
Isc coefficient α	+0.025 %/°C
Operating cell temperature	NOCT 45.8 °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
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%

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

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.

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	578	11,564	6.08
Palmdale	1,835	633	12,662	6.69
Chula Vista	1,696	585	11,702	6.11
Huntington Beach	1,643	567	11,337	5.89
Riverside	1,696	585	11,702	6.21
Santa Clarita	1,724	595	11,896	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.

Questions & answers

How efficient is the LG Electronics LG345M1K-L5?

Calculated from the panel area (1.73 m²): about 20% for the 345 W class. 345 W over 1.73 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 578 kWh per year per 345 W panel in Los Angeles and about 633 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.343 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 17.8% below the STC rating.

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).

Sources

California Energy Commission — Solar Equipment Lists, PV Module List (snapshot Oct 7, 2026).
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2018–2021.
NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Chula Vista, Huntington Beach, Riverside, Santa Clarita.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).