Illustration · 132 cells

Solar panelJA Solar

JA Solar JAM66D45-615/LB

Name: JA Solar JAM66D45-615/LB
Brand: JA Solar

132 cells, bifacial. Power classes 595–635 W in the CEC list.

CEC listed · Mar 3, 2025UL 61730BifacialPVEL Top Performer 2025, 2026

Power class

Power (STC)615 WCEC nameplate
Efficiency≈23.3%calculated from area
%/°C Pmax−0.317CEC listing test
PTC / STC94%PTC 578 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 9 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
JAM66D45-595/LB	595 W	47.50	15.90	39.27	15.15	≈22.5%	559 W	Mar 3, 2025
JAM66D45-600/LB	600 W	47.70	15.95	39.44	15.21	≈22.7%	563 W	Mar 3, 2025
JAM66D45-605/LB	605 W	47.90	16.00	39.60	15.28	≈22.9%	568 W	Mar 3, 2025
JAM66D45-610/LB	610 W	48.10	16.05	39.77	15.34	≈23.1%	573 W	Mar 3, 2025
JAM66D45-615/LB	615 W	48.30	16.10	39.96	15.39	≈23.3%	578 W	Mar 3, 2025
JAM66D45-620/LB	620 W	48.50	16.13	40.21	15.42	≈23.5%	583 W	Mar 3, 2025
JAM66D45-625/LB	625 W	48.70	16.15	40.45	15.45	≈23.7%	588 W	Mar 11, 2026
JAM66D45-630/LB	630 W	48.90	16.18	40.70	15.48	≈23.9%	592 W	Mar 11, 2026
JAM66D45-635/LB	635 W	49.10	16.21	40.94	15.51	≈24.1%	597 W	Mar 11, 2026

≈ efficiency = Pmax ÷ CEC-listed area 2.64 m².

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.317 %/°C
Voc coefficient β	−0.247 %/°C
Isc coefficient α	+0.041 %/°C
Operating cell temperature	NOCT 46 °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
595 W	444.7 W	38.12 V × 11.67 A	115.1 W	97%
600 W	448.4 W	38.28 V × 11.71 A	116 W	97%
605 W	452.3 W	38.44 V × 11.77 A	117 W	97%
610 W	456 W	38.6 V × 11.81 A	118 W	97%
615 W	459.7 W	38.79 V × 11.85 A	118.9 W	97%
620 W	463.5 W	39.03 V × 11.87 A	119.9 W	97%
625 W	467.1 W	39.26 V × 11.9 A	120.9 W	97%
630 W	470.9 W	39.51 V × 11.92 A	121.9 W	97%
635 W	474.6 W	39.74 V × 11.94 A	122.8 W	97%

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

Certifications

CEC PV Module List (Oct 7, 2026) · Clean Energy Council (Australia)

UL 61730IEC 61215:2021 / IEC 61730:2023

UL 61730CEC listing
IEC 61215:2021 / IEC 61730:2023TÜV SÜD Product Service GmbH, valid to Jul 2028

Independent reliability testing

Kiwa PVEL Scorecard · RETC PV Module Index

2025, 2026

PVEL Top Performer

this series

Tests passed as Top Performer

DH, LID+LETID, MSS, PID, TC

PVEL Scorecards

JA Solar named Top Performer, 2014–2026

2023, 2024, 2025, 2026

RETC Overall Highest Achiever

JA Solar, manufacturer level

PVEL Top Performer tests

Year	Product	Tests
2025	JAM66D45-xxx/LB	DHLID+LETIDMSSPIDTC
2026	JAM66D45-xxx/LB	DHLID+LETIDMSSPIDTC

Tested bill of materials

PVEL-tested factoryChina
Cell technology (tested BOM)n-type TOPCon
Module design (tested BOM)bifacial - 2.0 glass//2.0 glass
Power class range tested580-625W

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

RETC PV Module Index — JA Solar

Year	Recognition
2023	Overall Highest Achiever; High Achievement in Performance (Ptc-to-stc ratio, Pan file performance, Module efficiency, LeTID RESISTANCE); High Achievement in Quality (Hail durability test, Thresher test); High Achievement in Reliability (Thermal cycle test, SDML, Pid resistance, 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 (Conversion efficiency, Iam, Letid, Lid, PAN file, PTC-to-STC, Temperature coefficient); Quality discipline high achiever (BOM verification); Reliability discipline high achiever (Damp heat, Pid, Sdml, Tc)

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

51 V

Voc when cold

per panel

33 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	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	4–11
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	8–9

Microinverters (one per panel)

No microinverter in the reference set lists this power class in its recommended module power range.

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	1,031	11,338	6.08
Palmdale	1,835	1,129	12,414	6.69
Chula Vista	1,696	1,043	11,473	6.11
Huntington Beach	1,643	1,010	11,115	5.89
Riverside	1,696	1,043	11,473	6.21
Santa Clarita	1,724	1,060	11,663	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 615 W panels

CEC PV Module List (Oct 7, 2026) · Kiwa PVEL Scorecard · Waaree datasheet

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	PVEL (product / brand)
JA Solar JAM66D45-615/LB	615 W	≈23.3%	−0.317	48.3	16.1	product 2025, 2026
Phono Solar PS610M8GFH-24/TNH	610 W	≈23.8%	−0.293	53.8	14.02	product 2024, 2025
ZNShine Solar ZXM7-UHLDD144-615/N	615 W	≈24%	−0.281	52.9	14.72	product 2024, 2025, 2026
Waaree BiN-21-615	615 W	≥22.8%	−0.288	48.9	15.97	product 2026

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 JA Solar

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

ManufacturerJA Solar
Listed in CEC asJA Solar
PVEL Top Performer (manufacturer)11 Scorecards (2014–2026)
RETC PV Module Index2023, 2024, 2025, 2026
Current panel series in CEC list22

Other series by SoCal permits

JAM54S31-xxx/MR · 152JAM54D41-xxx/MB · 17JAM72D30-xxx/MB · 3JAM54S30-xxx/MR · 1JAM54D30-xxx/MBJAM72D40-xxx/MB

Questions & answers

How efficient is the JA Solar JAM66D45-615/LB?

Calculated from the panel area (2.64 m²): about 23.3% for the 615 W class. 615 W over 2.64 m² equals about 233 W per square meter.

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

PVWatts v8 with typical-year weather gives about 1,031 kWh per year per 615 W panel in Los Angeles and about 1,129 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.317 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 16.4% 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 = 51 V, Vmp at 74 °C cell = 33 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?

JAM66D45-xxx/LB was a PVEL Top Performer in 2025, 2026 (DH, LID+LETID, MSS, PID, TC).

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Waaree — datasheet ELITE-R-SERIES-BiN-21-600-635-WEL-EPD-600-635-132-BiN-HC.
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2014–2026.
RETC — PV Module Index reports 2023–2026.
NLR (formerly NREL) — System Advisor Model CEC module and inverter libraries (version 2026.7.3).
Clean Energy Council (Australia) — Approved PV modules list (as of Oct 8, 2026).
NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Chula Vista, Huntington Beach, Riverside, Santa Clarita.
Inverter datasheets — Solis (Ginlong), Tesla (manufacturer documents).
Building permits — Southern California permit portals. Equipment matched from permit descriptions.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).