Illustration · 120 half-cut cells

Solar panelLONGi

LONGi LR4-60HBD-360M

Name: LONGi LR4-60HBD-360M
Brand: LONGi

120 half-cut cells, bifacial. Power classes 345–365 W in the CEC list.

CEC listed · Mar 11, 2020UL 61730BifacialPVEL Top Performer 2022Seen in 1 SoCal permit

Power class

Power (STC)360 WCEC nameplate
Efficiency≈19.7%calculated from area
%/°C Pmax−0.326CEC listing test
PTC / STC93.2%PTC 336 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
LR4-60HBD-345M	345 W	40.70	10.88	33.70	10.24	≈18.9%	321 W	Mar 11, 2020
LR4-60HBD-350M	350 W	40.90	10.96	33.90	10.33	≈19.1%	326 W	Mar 11, 2020
LR4-60HBD-355M	355 W	41.10	11.04	34.10	10.42	≈19.4%	331 W	Mar 11, 2020
LR4-60HBD-360M	360 W	41.30	11.11	34.30	10.50	≈19.7%	336 W	Mar 11, 2020
LR4-60HBD-365M	365 W	41.50	11.18	34.50	10.58	≈19.9%	340 W	Mar 11, 2020

≈ efficiency = Pmax ÷ CEC-listed area 1.83 m².

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.326 %/°C
Voc coefficient β	−0.268 %/°C
Isc coefficient α	+0.042 %/°C
Operating cell temperature	NOCT 46.5 °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
345 W	248.2 W	31.41 V × 7.9 A	62.9 W	91%
350 W	252 W	31.59 V × 7.98 A	63.9 W	91%
355 W	255.7 W	31.78 V × 8.04 A	64.8 W	91%
360 W	259 W	31.97 V × 8.1 A	65.7 W	91%
365 W	262.6 W	32.15 V × 8.17 A	66.6 W	91%

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

2022

PVEL Top Performer

this series

Tests passed as Top Performer

DH, LID+LETID, MSS, PID, TC

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
2022	LR4-60HBD-xxxM	DHLID+LETIDMSSPIDTC

Tested bill of materials

Cell technology (tested BOM)p-type PERC
Module design (tested BOM)Bifacial - glass//glass
Power class range tested355-400W

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

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

43.8 V

Voc when cold

per panel

28.1 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	3–13
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–13
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–13
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	9–11

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	43.8 / 28.1 V	⚠ Works; below MPPT at peak heat	1.24
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	43.8 / 28.1 V	✗ Not a match: module voltage below MPPT range	0.95
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	43.8 / 28.1 V	✓ Within range	0.46
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	43.8 / 28.1 V	⚠ Works; below MPPT at peak heat	1.11
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	43.8 / 28.1 V	⚠ Works; below MPPT at peak heat	1.03

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	603	11,464	6.08
Palmdale	1,835	661	12,551	6.69
Chula Vista	1,696	611	11,601	6.11
Huntington Beach	1,643	591	11,238	5.89
Riverside	1,696	611	11,601	6.21
Santa Clarita	1,724	621	11,792	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.

Compare with similar 360 W panels

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

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	PVEL (product / brand)	SoCal permits (series)
LONGi LR4-60HBD-360M	360 W	≈19.7%	−0.326	41.3	11.11	product 2022	1
REC Group REC360AA	360 W	≈21.4%	−0.279	44.1	10.23	brand 9× (2016–2025)	30
Trina Solar TSM-360DE06X.05(II)	360 W	≈19.8%	−0.339	44.8	10.3	product 2022	23
Qcells Q.PEAK DUO-G8+ 360	360 W	≥20.1%	−0.343	41.19	10.84	product 2022	20

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 · 19LR5-72HBD-xxxM · 1LR5-78HBD-xxxM

Questions & answers

How efficient is the LONGi LR4-60HBD-360M?

Calculated from the panel area (1.83 m²): about 19.7% for the 360 W class. 360 W over 1.83 m² equals about 197 W per square meter.

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

PVWatts v8 with typical-year weather gives about 603 kWh per year per 360 W panel in Los Angeles and about 661 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.326 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 16.9% 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 3–13 panels per string (Voc at 2 °C = 43.8 V, Vmp at 74 °C cell = 28.1 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 43.8 V vs max input 60 V; Vmp when hot 28.1 V vs MPPT low 28 V; recommended module power 265–570 W. Confirm on the microinverter maker’s compatibility list.

Is it bifacial?

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

Has this panel been reliability-tested?

LR4-60HBD-xxxM was a PVEL Top Performer in 2022 (DH, LID+LETID, MSS, PID, TC).

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Qcells — manufacturer datasheet “Q.PEAK DUO-G8+ 345-360 EN ENDURING HIGH”.
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 — City of Palmdale (Apr 2024). Equipment matched from permit descriptions by model number.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).