44.6″ · 1,133 mm wide · 1.38″ (35 mm) frame · 71.2 lb (32.3 kg)

Solar panelLONGi

LONGi LR5-72HBD-555M

Name: LONGi LR5-72HBD-555M
Brand: LONGi

144 half-cut cells, bifacial, glass (dual-glass module). Power classes 520–565 W in the CEC list; datasheet covers 530–550 W.

CEC listed · May 3, 2021UL 61730Bifacial · 70 ± 5%PVEL Top Performer 2026Installed in 1 SoCal permit

Power class

Power (STC)555 Wtolerance +3 / −0 %
Efficiency≈21.7%calculated from area
%/°C Pmax−0.34CEC test: −0.354
Performance warranty30 yrdatasheet

Power classes

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

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
LR5-72HBD-520M	520 W	48.90	13.57	41.05	12.67	≈20.3%	484 W	May 3, 2021
LR5-72HBD-525M	525 W	49.05	13.65	41.20	12.75	≈20.5%	489 W	May 3, 2021
LR5-72HBD-530M	530 W	49.20	13.71	41.35	12.82	≥20.7%	494 W	May 3, 2021
LR5-72HBD-535M	535 W	49.35	13.78	41.50	12.90	≥20.9%	499 W	May 3, 2021
LR5-72HBD-540M	540 W	49.50	13.85	41.65	12.97	≥21.1%	497 W	May 3, 2021
LR5-72HBD-545M	545 W	49.65	13.92	41.80	13.04	≥21.3%	502 W	May 3, 2021
LR5-72HBD-550M	550 W	49.80	13.99	41.95	13.12	≥21.5%	507 W	Jul 22, 2024
LR5-72HBD-555M	555 W	49.95	14.05	42.10	13.19	≈21.7%	512 W	Jul 22, 2024
LR5-72HBD-560M	560 W	50.10	14.10	42.25	13.26	≈21.9%	516 W	Jul 22, 2024
LR5-72HBD-565M	565 W	50.25	14.16	42.40	13.33	≈22.1%	521 W	Sep 23, 2024

≈ efficiency = Pmax ÷ panel area 2.556 m² (datasheet size) for classes outside the datasheet.

Build & dimensions

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

Dimensions88.8 × 44.6 × 1.38 in2,256 × 1,133 × 35 mm
Module area2.56 m² (27.5 ft²)length × width
Weight71.2 lb (32.3 kg)
Cells144 half-cut cells
Front glassDual glass, 2.0+2.0mm Semi-tempered glass
Back coverGlass (dual-glass module)
FrameAnodized aluminum alloy frame
Junction boxIP68

Heat & cold behaviour

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

	Datasheet	CEC listing test
Pmax coefficient γ	−0.34 %/°C	−0.354 %/°C
Voc coefficient β	−0.27 %/°C	−0.266 %/°C
Isc coefficient α	+0.05 %/°C	+0.045 %/°C
Vmp coefficient	≈ −0.39 %/°C	—
Operating cell temperature	NMOT 45 ± 2 °C	NOCT 48.7 °C

Vmp coefficient ≈ γ − α (datasheet); used only for the hot-roof voltage estimate.

At normal operating conditions (NOCT, 800 W/m²) — datasheet

Class	Pmax, W	Voc, V	Isc, A	Vmp, V	Imp, A
530 W	396.2	46.26	11.07	38.58	10.27
535 W	399.9	46.40	11.12	38.72	10.33
540 W	403.6	46.54	11.17	38.86	10.39
545 W	407.4	46.68	11.23	39.00	10.45
550 W	411.1	46.82	11.29	39.14	10.51

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
520 W	385.8 W	38.09 V × 10.13 A	99.1 W	95%
525 W	389.7 W	38.23 V × 10.19 A	100.1 W	95%
530 W	393.2 W	38.37 V × 10.25 A	101 W	95%
535 W	397 W	38.51 V × 10.31 A	101.9 W	95%
540 W	397.3 W	39.14 V × 10.15 A	106.6 W	99%
545 W	400.8 W	39.28 V × 10.2 A	107.5 W	99%
550 W	404.7 W	39.42 V × 10.27 A	108.6 W	99%
555 W	408.4 W	39.56 V × 10.32 A	109.6 W	99%
560 W	412 W	39.7 V × 10.38 A	110.5 W	99%
565 W	415.6 W	39.84 V × 10.43 A	111.5 W	99%

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

Electrical & strength ratings

LONGi datasheet

Max system voltage1500 V
Max series fuse30 A
Module temperature−40 °F to +185 °F−40 °C to +85 °C
Hail25 mm (0.98 in) at 23 km/h
Power tolerance+3 / −0 %

Packaging: 20 per pallet

Bifacial performance

NLR SAM module library · LONGi datasheet · CEC PV Module List (Oct 7, 2026)

BifacialYes
Bifaciality70 ± 5%
Back coverGlass (dual-glass module)

Rear gain depends on mounting height and ground reflectance; flush roof mounts receive little rear light.

Certifications

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

UL 61730IEC 61215IEC 61730ISO 14001ISO 45001ISO 9001

UL 61730CEC listing
IEC 61215datasheet
IEC 61730datasheet
ISO 14001factory, datasheet
ISO 45001factory, datasheet
ISO 9001factory, datasheet

Warranty & degradation

LONGi datasheet

Performance warranty30 years

Independent reliability testing

Kiwa PVEL Scorecard · RETC PV Module Index

2026

PVEL Top Performer

this series

Tests passed as Top Performer

DH, LID+LETID, MSS, PID

PVEL Scorecards

LONGi named Top Performer, 2017–2026

2023, 2024, 2025, 2026

RETC Overall Highest Achiever

LONGi, manufacturer level

PVEL Top Performer tests

Year	Product	Tests
2026	LR5-72HBD-xxxM	DHLID+LETIDMSSPID

Tested bill of materials

PVEL-tested factoryChina
Cell technology (tested BOM)p-type PERC
Module design (tested BOM)bifacial - 2.0 glass//2.0 glass
Power class range tested530-575W

Details describe the tested sample, not every module of the series.

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

LONGi 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

53 V

Voc when cold

per panel

34.1 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.

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	2–11
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–11
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	3–11
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	7–9

Microinverters (one per panel)

Microinverter	Recommended module power	Max DC input	MPPT	Voc cold / Vmp hot	Check	DC/AC
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	53 / 34.1 V	✓ Within range	0.71

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	930	12,092	6.08
Palmdale	1,835	1,018	13,240	6.69
Chula Vista	1,696	941	12,237	6.11
Huntington Beach	1,643	912	11,854	5.89
Riverside	1,696	941	12,237	6.21
Santa Clarita	1,724	957	12,439	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 LR5-72HBD-xxxM panels in SoCal

building permits · CSLB License Master

Permits naming this series

Jun 2026

Licensed installers

CSLB license on the permit

Jurisdictions so far

Chula Vista (1)

Green Energy Electrical

San Diego · CSLB #1132791

1 installJun 2026Chula Vista

Only installer and ZIP level is shown — no homeowner names, street addresses or permit numbers. Counts grow as more permit portals are loaded.

Compare with similar 555 W panels

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

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	PVEL (product / brand)	SoCal permits (series)
LONGi LR5-72HBD-555M	555 W	≈21.7%	−0.354	49.95	14.05	product 2026	1
JA Solar JAM72D30-550/MB	550 W	≈21.8%	−0.330	49.9	14	product 2023, 2024	3
Canadian Solar CS6W-555MB-AG	555 W	≈21.6%	−0.324	49.8	14.05	product 2024	1
AXITEC AC-555MH/144V	555 W	≥21.5%	−0.366	50.05	14.07	—	1

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 · 64LR5-54HPB-xxxM · 22LR4-60HPH-xxxM · 19LR4-60HBD-xxxM · 1LR5-78HBD-xxxM

Questions & answers

How efficient is the LONGi LR5-72HBD-555M?

Calculated from the panel area (2.56 m²): about 21.7% for the 555 W class. 555 W over 2.56 m² equals about 217 W per square meter.

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

PVWatts v8 with typical-year weather gives about 930 kWh per year per 555 W panel in Los Angeles and about 1,018 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.34 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 17.6% 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 = 53 V, Vmp at 74 °C cell = 34.1 V). Final design must follow the inverter manual and NEC 690.7.

Does it work with APsystems (Alt Power System) DS3-L microinverters?

Voltage check against the APsystems (Alt Power System) datasheet: Voc when cold 53 V vs max input 60 V; Vmp when hot 34.1 V vs MPPT low 28 V; recommended module power 265–570 W. Confirm on the microinverter maker’s compatibility list.

What does the warranty cover?

30 years on performance (manufacturer datasheet).

How big and heavy is it?

88.8 × 44.6 × 1.38 in (2,256 × 1,133 × 35 mm), 71.2 lb (32.3 kg).

Is it bifacial?

Yes, bifaciality 70 ± 5%. Rear gain depends on mounting height and ground reflectance.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
LONGi — manufacturer datasheet “LR5-72HBD Suitable for distributed projects Advanced module technology delivers superior”.
Canadian Solar — datasheet BiHiKu6 BIFACIAL MONO PERC CS6W-520|525|530|535|540|545|550MB-AG.
AXITEC — datasheet AXIworldbipremium bifacial 144 cells asemmbled in US.
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), Solis (Ginlong), Tesla (manufacturer documents).
Building permits — City of Chula Vista (Jun 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).