Illustration · 108 half-cut cells

Solar panelLONGi

LONGi LR5-54HABB-400M

Name: LONGi LR5-54HABB-400M
Brand: LONGi

108 half-cut cells, bifacial, glass (dual-glass module). Power classes 395–415 W in the CEC list.

CEC listed · Mar 1, 2023UL 61730BifacialInstalled in 64 SoCal permits

Power class

Power (STC)400 WCEC nameplate
Efficiency≈21.1%calculated from area
%/°C Pmax−0.342CEC listing test
PTC / STC93.5%PTC 374 W (CEC)

Power classes

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

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
LR5-54HABB-395M	395 W	36.81	13.65	30.70	12.87	≈20.8%	369 W	Mar 1, 2023
LR5-54HABB-400M	400 W	37.05	13.72	30.94	12.93	≈21.1%	374 W	Mar 1, 2023
LR5-54HABB-405M	405 W	37.29	13.79	31.18	12.99	≈21.3%	379 W	Mar 1, 2023
LR5-54HABB-410M	410 W	37.53	13.87	31.42	13.05	≈21.6%	384 W	Mar 1, 2023
LR5-54HABB-415M	415 W	37.77	13.94	31.66	13.11	≈21.8%	388 W	Mar 1, 2023

≈ 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 coverGlass (dual-glass module)

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.342 %/°C
Voc coefficient β	−0.263 %/°C
Isc coefficient α	+0.029 %/°C
Operating cell temperature	NOCT 45 °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
395 W	292.3 W	28.6 V × 10.22 A	75.8 W	96%
400 W	295.9 W	28.83 V × 10.27 A	76.8 W	96%
405 W	299.6 W	29.05 V × 10.31 A	77.7 W	96%
410 W	303.3 W	29.27 V × 10.36 A	78.7 W	96%
415 W	307 W	29.5 V × 10.41 A	79.6 W	96%

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

39.3 V

Voc when cold

per panel

25.3 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. 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	39.3 / 25.3 V	⚠ Works; below MPPT at peak heat	1.38
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	39.3 / 25.3 V	✗ Not a match: module voltage below MPPT range	1.05
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	39.3 / 25.3 V	⚠ Works; below MPPT at peak heat	0.51
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	39.3 / 25.3 V	⚠ Works; below MPPT at peak heat	1.23
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	39.3 / 25.3 V	✗ Not a match: module voltage below MPPT range	1.15

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	670	12,067	6.08
Palmdale	1,835	734	13,212	6.69
Chula Vista	1,696	678	12,211	6.11
Huntington Beach	1,643	657	11,830	5.89
Riverside	1,696	678	12,211	6.21
Santa Clarita	1,724	690	12,413	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 LR5-54HABB-xxxM panels in SoCal

building permits · CSLB License Master

Permits naming this series

May 2024 – Mar 2026

Licensed installers

CSLB license on the permit

Jurisdictions so far

LA County (unincorp.) (58), Palmdale (4), Huntington Beach (2)

Ces Roofing

San Dimas · CSLB #998787

4 installsJul 2024 – Mar 2026Palmdale

Sunrun

Lehi · CSLB #750184

2 installsFeb 2025 – Mar 2025Huntington Beach

Permits over time

Power class named in permit

400 W

395 W

405 W

Top ZIP codes

ZIP 9138414
ZIP 913116
ZIP 935515
ZIP 913815
ZIP 935504
ZIP 913613
ZIP 906052
ZIP 902652
Other ZIP codes11

Typical system

median 8.4 kW, 22 panels (n = 59)

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 IQ8+

Inverters

SolarEdge SE…H (HD-Wave)

Optimizers

SolarEdge Power Optimizer

Batteries

Tesla Powerwall 3

SolarEdge Home Battery

Tesla Powerwall 3 Expansion

Tesla Powerwall 2

Number of permits naming both this panel series and the product; 62 of 64 permits list other equipment.

Compare with similar 400 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 LR5-54HABB-400M	400 W	≈21.1%	−0.342	37.05	13.72	brand 9×	64
Qcells Q.PEAK DUO BLK ML-G10+ 400	400 W	≥20.4%	−0.362	45.3	11.14	product 2022, 2023	221
JA Solar JAM54S31-400/MR	400 W	≈21.1%	−0.329	37.07	13.79	product 2023, 2024	152
REC Group REC400AA Pure	400 W	≈22.3%	−0.256	48.8	10.25	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 · 193LR5-54HPB-xxxM · 22LR4-60HPH-xxxM · 19LR5-72HBD-xxxM · 1LR4-60HBD-xxxM · 1LR5-78HBD-xxxM

Questions & answers

How efficient is the LONGi LR5-54HABB-400M?

Calculated from the panel area (1.9 m²): about 21.1% for the 400 W class. 400 W over 1.9 m² equals about 211 W per square meter.

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

PVWatts v8 with typical-year weather gives about 670 kWh per year per 400 W panel in Los Angeles and about 734 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.342 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 17.7% 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 = 39.3 V, Vmp at 74 °C cell = 25.3 V). Final design must follow the inverter manual and NEC 690.7.

Is it bifacial?

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

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 64 times (May 2024 – Mar 2026). The most active licensed installers are Ces Roofing, Sunrun.

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 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 — Los Angeles County Public Works (EPIC-LA, unincorporated areas) (May 2024 – Nov 2025); City of Palmdale (Jul 2024 – Mar 2026); City of Huntington Beach (Feb 2025 – Mar 2025). 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).