Illustration · 108 half-cut cells

Solar panelLONGi

LONGi LR5-54HPB-405M

Name: LONGi LR5-54HPB-405M
Brand: LONGi

108 half-cut cells. Power classes 390–420 W in the CEC list.

CEC listed · Aug 22, 2022UL 61730Installed in 22 SoCal permits

Power class

Power (STC)405 WCEC nameplate
Efficiency≈21.3%calculated from area
%/°C Pmax−0.358CEC listing test
PTC / STC92.8%PTC 376 W (CEC)

Power classes

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

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
LR5-54HPB-390M	390 W	36.40	13.59	30.45	12.81	≈20.5%	362 W	Nov 21, 2025
LR5-54HPB-395M	395 W	36.65	13.66	30.70	12.87	≈20.8%	366 W	Nov 21, 2025
LR5-54HPB-400M	400 W	36.90	13.72	30.94	12.93	≈21.1%	371 W	Aug 22, 2022
LR5-54HPB-405M	405 W	37.15	13.78	31.18	12.99	≈21.3%	376 W	Aug 22, 2022
LR5-54HPB-410M	410 W	37.40	13.84	31.42	13.05	≈21.6%	381 W	Aug 22, 2022
LR5-54HPB-415M	415 W	37.65	13.91	31.66	13.11	≈21.8%	385 W	Aug 22, 2022
LR5-54HPB-420M	420 W	37.89	13.97	31.90	13.17	≈22.1%	390 W	Aug 22, 2022

≈ efficiency = Pmax ÷ CEC-listed area 1.9 m².

Build & dimensions

CEC PV Module List (Oct 7, 2026)

Module area1.9 m² (20.5 ft²)CEC-listed area
Cells108 half-cut cells
Back coverBlack backsheet

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.358 %/°C
Voc coefficient β	−0.270 %/°C
Isc coefficient α	+0.039 %/°C
Operating cell temperature	NOCT 46.3 °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
390 W	282.8 W	28.07 V × 10.07 A	73 W	94%
395 W	286.5 W	28.3 V × 10.12 A	73.9 W	94%
400 W	290.1 W	28.53 V × 10.17 A	74.8 W	94%
405 W	293.7 W	28.75 V × 10.22 A	75.8 W	94%
410 W	297.3 W	28.97 V × 10.26 A	76.7 W	94%
415 W	300.9 W	29.19 V × 10.31 A	77.6 W	94%
420 W	304.6 W	29.41 V × 10.36 A	78.6 W	94%

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 · RETC PV Module Index

PVEL Scorecards

LONGi named Top Performer, 2017–2026

2023, 2024, 2025, 2026

RETC Overall Highest Achiever

LONGi, manufacturer level

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

RETC PV Module Index — LONGi

Year	Recognition
2023	Overall Highest Achiever; High Achievement in Performance (Pan file performance, Module efficiency, Lid resistance); High Achievement in Quality (Thresher test); High Achievement in Reliability (Thermal cycle test, SDML, Damp heat test)
2024	Overall Highest Achiever
2025	Overall Highest Achiever
2026	Overall Highest Achiever; High achievement in performance; High achievement in reliability; Performance discipline high achiever (Iam, Letid, PAN file, PTC-to-STC); Quality discipline high achiever (BOM verification); Reliability discipline high achiever (Damp heat, Hdt, Pid, Sdml, Tc, Uvid)

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

39.5 V

Voc when cold

per panel

25.1 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	3–15
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	4–15
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–15
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	10–12

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	39.5 / 25.1 V	⚠ Works; below MPPT at peak heat	1.4
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	39.5 / 25.1 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	39.5 / 25.1 V	⚠ Works; below MPPT at peak heat	0.52
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	39.5 / 25.1 V	⚠ Works; below MPPT at peak heat	1.25
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	39.5 / 25.1 V	✗ Not a match: module voltage below MPPT range	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.

Who installs LR5-54HPB-xxxM panels in SoCal

building permits · CSLB License Master

Permits naming this series

Mar 2025 – Sep 2026

Licensed installers

CSLB license on the permit

Jurisdictions so far

Chula Vista (8), LA County (unincorp.) (8), Palmdale (6)

Lennar Homes Of California LLC

Irvine · CSLB #728102

5 installsSep 2026Chula Vista

Better Earth Electric Inc

Cerritos · CSLB #1024460

3 installsApr 2026 – May 2026Palmdale

Aloha Solar Power And Electrical Services Inc

Encinitas · CSLB #1066562

1 installJun 2026Chula Vista

Baker Home Energy

Escondido · CSLB #858088

1 installMay 2026Chula Vista

Ce Energy Services Inc

Sylmar · CSLB #986864

1 installMar 2025Palmdale

Exo Energy Inc

San Marcos · CSLB #1063308

1 installApr 2026Palmdale

Homelink Solar

Chino · CSLB #1117534

1 installDec 2025Palmdale

Sunrun

Lehi · CSLB #750184

1 installJun 2026Chula Vista

Permits over time

Power class named in permit

405 W

410 W

400 W

Top ZIP codes

ZIP 935524
ZIP 919112
ZIP 935512
ZIP 917242
Other ZIP codes6

Typical system

median 4.9 kW, 16 panels (n = 19)

Only installer and ZIP level is shown — no homeowner names, street addresses or permit numbers. Permits from LA County (unincorp.) come without a contractor license, so they count toward totals but not toward installers. Counts grow as more permit portals are loaded.

Installed together with

building permits

Microinverters

Enphase IQ8MC

Batteries

Tesla Powerwall 3

FranklinWH aPower 2

Tesla Powerwall 3 Expansion

Number of permits naming both this panel series and the product; 22 of 22 permits list other equipment.

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)
LONGi LR5-54HPB-405M	405 W	≈21.3%	−0.358	37.15	13.78	brand 9×	22
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.

About LONGi

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

ManufacturerLONGi
Listed in CEC asLONGi Green Energy Technology Co., Ltd.
Websitelongi.com
PVEL Top Performer (manufacturer)9 Scorecards (2017–2026)
RETC PV Module Index2023, 2024, 2025, 2026
Current panel series in CEC list25

Other series by SoCal permits

LR4-60HPB-xxxM · 193LR5-54HABB-xxxM · 64LR4-60HPH-xxxM · 19LR5-72HBD-xxxM · 1LR4-60HBD-xxxM · 1LR5-78HBD-xxxM

Questions & answers

How efficient is the LONGi LR5-54HPB-405M?

Calculated from the panel area (1.9 m²): about 21.3% for the 405 W class. 405 W over 1.9 m² equals about 213 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 = −0.358 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 18.5% 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 3–15 panels per string (Voc at 2 °C = 39.5 V, Vmp at 74 °C cell = 25.1 V). Final design must follow the inverter manual and NEC 690.7.

Has this panel been reliability-tested?

This exact series is not in published PVEL Top Performer tables; LONGi was named a Top Performer in 9 Scorecards (2017–2026). RETC named LONGi Overall Highest Achiever in 2023, 2024, 2025, 2026.

Who installs it in Southern California?

Building permits name this series 22 times (Mar 2025 – Sep 2026). The most active licensed installers are Lennar Homes Of California LLC, Better Earth Electric Inc, Aloha Solar Power And Electrical Services Inc.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Qcells — manufacturer datasheet “Q.PEAK DUO BLK ML-G10+ ENDURING HIGH PERFORMANCE”.
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2017–2026.
RETC — PV Module Index reports 2023–2026.
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 — City of Chula Vista (May 2026 – Sep 2026); Los Angeles County Public Works (EPIC-LA, unincorporated areas) (Sep 2025 – Aug 2026); City of Palmdale (Mar 2025 – May 2026). Equipment matched from permit descriptions by model number.
Contractors State License Board — License Master (contractor names and license status), as of Oct 5, 2026.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).