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75.2″ · 1,910 mm
41″ · 1,042 mm wide · 1.57″ (40 mm) frame · 45.2 lb (20.5 kg)
Solar panelLG Electronics

LG Electronics LG425QAK-A6

66 cells, N-type. Power classes 415–430 W in the CEC list; datasheet covers 420–420 W.

CEC listed · Mar 11, 2021UL 61730N-typeSeen in 1 SoCal permit
Power class
  • Power (STC)425 WCEC nameplate
  • Efficiency≈21.4%calculated from area
  • %/°C Pmax−0.29CEC test: −0.297
  • Degradation / yr0.25%after year 1 (warranty)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · LG Electronics datasheet · 4 models
ModelPmaxVoc, VIsc, AVmp, VImp, AEfficiencyPTCCEC listed
LG415QAK-A6415 W47.9010.8241.2010.08≈20.9%386 WMar 11, 2021
LG420QAK-A6420 W48.0010.8341.3010.19≥21.1%391 WMar 11, 2021
LG425QAK-A6425 W48.1010.8441.3010.31≈21.4%396 WMar 11, 2021
LG430QAK-A6430 W48.2010.8541.3010.42≈21.6%401 WMar 11, 2021
≈ efficiency = Pmax ÷ panel area 1.99 m² (datasheet size) for classes outside the datasheet.

Build & dimensions

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

Heat & cold behaviour

LG Electronics datasheet · CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation
DatasheetCEC listing test
Pmax coefficient γ−0.29 %/°C−0.297 %/°C
Voc coefficient β−0.24 %/°C−0.239 %/°C
Isc coefficient α+0.04 %/°C+0.032 %/°C
Vmp coefficient≈ −0.33 %/°C—
Operating cell temperatureNMOT 44 ± 3 °CNOCT 49.3 °C
Vmp coefficient ≈ γ − α (datasheet); used only for the hot-roof voltage estimate.

Away from lab conditions — CEC listing test points

ClassPmax at NOCTVmp × Imp at NOCTPmax at 200 W/m²Low-light efficiency vs STC
415 W305.3 W38.29 V × 7.97 A78.2 W94%
420 W309.4 W38.38 V × 8.06 A79.3 W94%
425 W313 W38.38 V × 8.16 A80.2 W94%
430 W316.4 W38.38 V × 8.24 A81.1 W94%
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
Packaging: 25 per pallet

Certifications

CEC PV Module List (Oct 7, 2026) · LG Electronics datasheet
UL 61730IEC 61215IEC 61730IEC 61701IEC 62716Fire rating Type 2 (UL 61730)ISO 14001ISO 45001ISO 9001

Warranty & degradation

LG Electronics datasheet · Cali-Graf calculation
85%89%92%96%100%051015202598.5% yr 196.25% yr 1092.5% yr 25years
  • Product warranty25 years
  • Year 1≥ 98.5%
  • Then≤ 0.25% / year
  • Year 10≥ 96.25%calculated from warranty terms
  • Year 25≥ 92.5%

Independent reliability testing

Kiwa PVEL Scorecard
2
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)
50.8 V
Voc when cold
per panel
34.6 V
Vmp when hot
per panel
11
Max panels / string
max DC 600 V
2
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

InverterMax DC inputMPPTWindow sourcePanels per string
Tesla 1538000-xx-y600 V60–480 Vdatasheet2–11
Solis (Ginlong) S6-EH1P10K-H-US600 V80–520 Vdatasheet3–11
Solis (Ginlong) Solis-1P7.6K-4G-US600 V100–500 Vdatasheet3–11
Qcells Q.VOLT H7.6SX498 V234–498 VCEC test window7–9

Microinverters (one per panel)

MicroinverterRecommended module powerMax DC inputMPPTVoc cold / Vmp hotCheckDC/AC
Enphase IQ8PLUS-72-2-US235–440 W60 V29–45 V50.8 / 34.6 V✓ Within range1.47
Enphase IQ8X-80-M-US320–540 W79.5 V43–60 V50.8 / 34.6 V✗ Not a match: module voltage below MPPT range1.12
APsystems (Alt Power System) DS3-L265–570 W60 V28–45 V50.8 / 34.6 V✓ Within range0.54
Enphase IQ8M-72-2-US260–460 W60 V30–45 V50.8 / 34.6 V✓ Within range1.31
Enphase IQ8A-72-2-US295–500 W60 V32–45 V50.8 / 34.6 V✓ Within range1.22
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
CitykWh / kW / yrkWh / panel / yrkWh / system / yrSun, kWh/m²/day
Los Angeles1,67671211,3976.08
Palmdale1,83578012,4786.69
Chula Vista1,69672111,5336.11
Huntington Beach1,64369811,1725.89
Riverside1,69672111,5336.21
Santa Clarita1,72473311,7236.28
744Jan745Feb955Mar1,055Apr1,042May1,108Jun1,167Jul1,180Aug1,032Sep911Oct783Nov677DeckWh per month · Los Angeles
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 425 W panels

CEC PV Module List (Oct 7, 2026) · datasheets · Kiwa PVEL Scorecard · building permits
PanelPmaxEfficiencyγ Pmax (CEC)Voc, VIsc, ASizeWarrantyPVEL (product / brand)SoCal permits (series)
LG Electronics LG425QAK-A6425 W≈21.4%−0.29748.110.8475.2 × 41 in—brand 2×1
Canadian Solar CS3N-425MS425 W≥20.9%−0.33245.511.8—25 yrproduct 202346
Qcells Q.TRON BLK M-G2+ 425425 W≥21.8%−0.27639.0313.6667.8 × 44.6 in25 / 25 yrbrand 11× (2016–2026)40
Silfab Solar SIL-425QD425 W≈21.8%−0.29438.8813.6867.8 × 44.6 in25 / 30 yrbrand 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.

Documents

manufacturer documents

Questions & answers

How efficient is the LG Electronics LG425QAK-A6?

Calculated from the panel area (1.99 m²): about 21.4% for the 425 W class. 425 W over 1.99 m² equals about 214 W per square meter.

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

PVWatts v8 with typical-year weather gives about 712 kWh per year per 425 W panel in Los Angeles and about 780 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.29 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 15% 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 = 50.8 V, Vmp at 74 °C cell = 34.6 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 50.8 V vs max input 60 V; Vmp when hot 34.6 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 98.5% of rated power in year 1, then no more than 0.25% per year — at least 92.5% after 25 years (manufacturer datasheet).

How big and heavy is it?

75.2 × 41 × 1.57 in (1,910 × 1,042 × 40 mm), 45.2 lb (20.5 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).

Sources

  1. California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
  2. LG Electronics — datasheet Specification Sheet.
  3. Canadian Solar — manufacturer datasheet “HiKu Mono PERC CS3N-400|405|410|415|420|425MS MORE POWER”.
  4. Qcells — manufacturer datasheet “Q.TRON BLK M-G2+ SERIES 415–440 Wp”.
  5. Silfab Solar — datasheet NTC SIL-420 QD CELL TECHNOLOGY.
  6. LG Electronics — document library on the manufacturer’s website (links above).
  7. Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2018–2021.
  8. NLR (formerly NREL) — System Advisor Model CEC inverter library (version 2026.7.3).
  9. NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Chula Vista, Huntington Beach, Riverside, Santa Clarita.
  10. Inverter datasheets — APsystems (Alt Power System), Enphase, Solis (Ginlong), Tesla (manufacturer documents).
  11. Building permits — Los Angeles County Public Works (EPIC-LA, unincorporated areas) (Mar 2022). Equipment matched from permit descriptions by model number.
  12. Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).