Illustration · 72 cells

Solar panelJA Solar

JA Solar JAM72S09-390/PR

Name: JA Solar JAM72S09-390/PR
Brand: JA Solar

72 cells, PERC. Power classes 375–400 W in the CEC list; datasheet covers 375–395 W.

CEC listed · Sep 3, 2019UL 170312-yr product + 25-yr performance warrantyPVEL Top Performer 2021PERC

Power class

Power (STC)390 Wtolerance +5 / −0 W
Efficiency≥19.5%datasheet minimum
%/°C Pmax−0.37CEC test: −0.361
Performance warranty25 yrdatasheet

Power classes

CEC PV Module List (Oct 7, 2026) · JA Solar datasheet · Cali-Graf calculation · 6 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
JAM72S09-375/PR	375 W	48.47	10.06	39.27	9.55	≥18.8%	349 W	Sep 3, 2019
JAM72S09-380/PR	380 W	48.75	10.12	39.59	9.60	≥19.0%	354 W	Sep 3, 2019
JAM72S09-385/PR	385 W	49.04	10.17	39.90	9.65	≥19.3%	359 W	Sep 3, 2019
JAM72S09-390/PR	390 W	49.35	10.22	40.21	9.70	≥19.5%	364 W	Sep 3, 2019
JAM72S09-395/PR	395 W	49.64	10.27	40.48	9.76	≥19.8%	369 W	Sep 3, 2019
JAM72S09-400/PR	400 W	49.92	10.33	40.78	9.81	≈20.6%	373 W	Oct 11, 2021

≈ efficiency = Pmax ÷ CEC-listed area 1.94 m² for classes outside the datasheet.

Build & dimensions

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

Module area1.94 m² (20.9 ft²)CEC-listed area
Cells72 cellsPERC
Back coverWhite backsheet
Junction boxIP67, 3 diodes

Heat & cold behaviour

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

	Datasheet	CEC listing test
Pmax coefficient γ	−0.37 %/°C	−0.361 %/°C
Voc coefficient β	−0.30 %/°C	−0.268 %/°C
Isc coefficient α	+0.06 %/°C	+0.038 %/°C
Vmp coefficient	≈ −0.43 %/°C	—
Operating cell temperature	NMOT 45 ± 2 °C	NOCT 44.4 °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
375 W	278.0	45.86	7.95	37.05	7.49
380 W	281.0	46.15	7.99	37.34	7.53
385 W	285.0	46.47	8.03	37.64	7.57
390 W	289.0	46.78	8.07	37.92	7.61
395 W	292.0	47.09	8.11	38.21	7.65

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
375 W	276.7 W	36.5 V × 7.58 A	71.8 W	96%
380 W	280.4 W	36.8 V × 7.62 A	72.8 W	96%
385 W	284 W	37.09 V × 7.66 A	73.7 W	96%
390 W	287.7 W	37.38 V × 7.7 A	74.7 W	96%
395 W	291.4 W	37.63 V × 7.75 A	75.7 W	96%
400 W	295.1 W	37.91 V × 7.78 A	76.6 W	96%

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

Electrical & strength ratings

Max system voltage1,500 V (UL)
Max series fuse20 A
Fire rating (UL 61730)Type 1
Module temperature−40 °F to +185 °F−40 °C to +85 °C
Power tolerance+5 / −0 W

Certifications

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

UL 1703IEC 61215IEC 61730Fire rating Type 1 (UL 61730)ISO 14001ISO 45001ISO 9001

UL 1703CEC listing
IEC 61215datasheet
IEC 61730datasheet
Fire rating Type 1 (UL 61730)datasheet
ISO 14001factory, datasheet
ISO 45001factory, datasheet
ISO 9001factory, datasheet

Warranty & degradation

JA Solar datasheet

Product warranty12 years
Performance warranty25 years, linear

Independent reliability testing

Kiwa PVEL Scorecard · RETC PV Module Index

2021

PVEL Top Performer

this series

Tests passed as Top Performer

DH, PID

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
2021	JAM72S09-xxx/PR	DHPID

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

JA Solar 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

52.8 V

Voc when cold

per panel

31.7 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	4–11
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	8–9

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	52.8 / 31.7 V	✓ Within range	1.34
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	52.8 / 31.7 V	✗ Not a match: module voltage below MPPT range	1.03
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	52.8 / 31.7 V	✓ Within range	0.5
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	52.8 / 31.7 V	✓ Within range	1.2
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	52.8 / 31.7 V	⚠ Works; below MPPT at peak heat	1.12

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	654	11,766	6.08
Palmdale	1,835	716	12,882	6.69
Chula Vista	1,696	661	11,906	6.11
Huntington Beach	1,643	641	11,534	5.89
Riverside	1,696	661	11,906	6.21
Santa Clarita	1,724	672	12,102	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 390 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)
JA Solar JAM72S09-390/PR	390 W	≥19.5%	−0.361	49.35	10.22	product 2021	—
Qcells Q.PEAK DUO BLK ML-G10+ 390	390 W	≥19.9%	−0.362	45.23	11.07	product 2022, 2023	221
REC Group REC390AA Pure	390 W	≈21.8%	−0.256	48.6	10.19	brand 9× (2016–2025)	66
LONGi LR5-54HABB-395M	395 W	≈20.8%	−0.342	36.81	13.65	brand 9× (2017–2026)	64

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 · 1JAM66D45-xxx/LBJAM54D30-xxx/MB

Questions & answers

How efficient is the JA Solar JAM72S09-390/PR?

The JA Solar datasheet guarantees at least 19.5% module efficiency for the 390 W class (up to 19.8% for 395 W). 390 W over 1.94 m² equals about 201 W per square meter.

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

PVWatts v8 with typical-year weather gives about 654 kWh per year per 390 W panel in Los Angeles and about 716 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.37 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 19.2% 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 = 52.8 V, Vmp at 74 °C cell = 31.7 V). Final design must follow the inverter manual and NEC 690.7.

Does it work with Enphase IQ8PLUS-72-2-US microinverters?

Voltage check against the Enphase datasheet: Voc when cold 52.8 V vs max input 60 V; Vmp when hot 31.7 V vs MPPT low 29 V; recommended module power 235–440 W. Confirm on the microinverter maker’s compatibility list.

What does the warranty cover?

12 years on the product and 25 years linear on performance (manufacturer datasheet).

Has this panel been reliability-tested?

JAM72S09-xxx/PR was a PVEL Top Performer in 2021 (DH, PID).

What fire rating does it have?

UL 61730 fire rating Type 1 per datasheet.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
JA Solar — manufacturer datasheet “Mono 395W PERC Module JAM72S09 375-395/PR Series”.
Qcells — manufacturer datasheet “Q.PEAK DUO BLK ML-G10+ ENDURING HIGH PERFORMANCE”.
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 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 — 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).