Illustration · 108 half-cut cells

Solar panelJA Solar

JA Solar JAM54D41-440/MB

Name: JA Solar JAM54D41-440/MB
Brand: JA Solar

108 half-cut cells, bifacial. Power classes 425–440 W in the CEC list.

CEC listed · Jun 23, 2025UL 61730BifacialInstalled in 17 SoCal permits

Power class

Power (STC)440 WCEC nameplate
Efficiency≈23.3%calculated from area
%/°C Pmax−0.273CEC listing test
PTC / STC94.9%PTC 418 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 4 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
JAM54D41-425/MB	425 W	38.56	13.70	32.64	13.02	≈22.5%	403 W	Jun 23, 2025
JAM54D41-430/MB	430 W	38.84	13.75	32.88	13.08	≈22.8%	408 W	Jun 23, 2025
JAM54D41-435/MB	435 W	39.11	13.80	33.13	13.13	≈23.0%	413 W	Jun 23, 2025
JAM54D41-440/MB	440 W	39.38	13.85	33.37	13.18	≈23.3%	418 W	Jun 23, 2025

≈ efficiency = Pmax ÷ CEC-listed area 1.89 m².

Heat & cold behaviour

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

	CEC listing test
Pmax coefficient γ	−0.273 %/°C
Voc coefficient β	−0.220 %/°C
Isc coefficient α	+0.037 %/°C
Operating cell temperature	NOCT 45.6 °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
425 W	310.5 W	30.86 V × 10.06 A	81.8 W	96%
430 W	314.3 W	31.08 V × 10.11 A	82.8 W	96%
435 W	317.9 W	31.32 V × 10.15 A	83.8 W	96%
440 W	321.4 W	31.55 V × 10.19 A	84.7 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

JA Solar named Top Performer, 2014–2026

2023, 2024, 2025, 2026

RETC Overall Highest Achiever

JA Solar, manufacturer level

This exact series is not listed in published PVEL Top Performer tables. Results below are for the manufacturer.

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

41.4 V

Voc when cold

per panel

28.3 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	3–14
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–14
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–14
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	9–12

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	41.4 / 28.3 V	⚠ Works; below MPPT at peak heat	1.52
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	41.4 / 28.3 V	✗ Not a match: module voltage below MPPT range	1.16
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	41.4 / 28.3 V	✓ Within range	0.56
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	41.4 / 28.3 V	⚠ Works; below MPPT at peak heat	1.35
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	41.4 / 28.3 V	⚠ Works; below MPPT at peak heat	1.26

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	737	11,799	6.08
Palmdale	1,835	807	12,918	6.69
Chula Vista	1,696	746	11,940	6.11
Huntington Beach	1,643	723	11,567	5.89
Riverside	1,696	746	11,940	6.21
Santa Clarita	1,724	759	12,137	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 JAM54D41-xxx/MB panels in SoCal

building permits · CSLB License Master

Permits naming this series

Sep 2025 – Sep 2026

Licensed installers

CSLB license on the permit

Jurisdictions so far

LA County (unincorp.) (8), Palmdale (6), Huntington Beach (2), Chula V

South West Builders

Simi Valley · CSLB #1012298

3 installsSep 2025 – Dec 2025Palmdale

Ecosolar Usa Electrical LLC

Garden Grove · CSLB #1045300

2 installsMay 2026Huntington Beach

Capital Energy LLC

Tempe · CSLB #1142165

1 installSep 2026Chula Vista

Pacificsky Solar LLC

Chatsworth · CSLB #1004379

1 installNov 2025Palmdale

Timeproofusa

Anaheim · CSLB #1125771

1 installMar 2026Palmdale

Vibe Solar

Lancaster · CSLB #1036012

1 installNov 2025Palmdale

Permits over time

Top ZIP codes

ZIP 935513
ZIP 935502
ZIP 935522
ZIP 935912
Other ZIP codes5

Typical system

median 4.8 kW, 11 panels (n = 14)

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+

Enphase IQ8HC

Enphase IQ8MC

Inverters

SolarEdge Energy Hub

SolarEdge SE…H (HD-Wave)

Optimizers

SolarEdge Power Optimizer

Batteries

Enphase IQ Battery 5P

Number of permits naming both this panel series and the product; 17 of 17 permits list other equipment.

Compare with similar 440 W panels

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

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	Warranty	PVEL (product / brand)	SoCal permits (series)
JA Solar JAM54D41-440/MB	440 W	≈23.3%	−0.273	39.38	13.85	—	brand 11×	17
Qcells Q.TRON BLK M-G2+ 440	440 W	≥22.5%	−0.276	39.88	13.9	25 / 25 yr	brand 11× (2016–2026)	40
Silfab Solar SIL-440QD	440 W	≈22.6%	−0.294	38.97	14.25	25 / 30 yr	brand 7× (2017–2025)	39
Hyundai Energy Solutions HiN-T440NF(BK)	440 W	≈22.7%	−0.298	38.8	14.39	25 / 30 yr	brand 5× (2017–2025)	37

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 · 152JAM72D30-xxx/MB · 3JAM54S30-xxx/MR · 1JAM66D45-xxx/LBJAM54D30-xxx/MBJAM72D40-xxx/MB

Questions & answers

How efficient is the JA Solar JAM54D41-440/MB?

Calculated from the panel area (1.89 m²): about 23.3% for the 440 W class. 440 W over 1.89 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 737 kWh per year per 440 W panel in Los Angeles and about 807 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.273 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 14.1% 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 3–14 panels per string (Voc at 2 °C = 41.4 V, Vmp at 74 °C cell = 28.3 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 41.4 V vs max input 60 V; Vmp when hot 28.3 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?

This exact series is not in published PVEL Top Performer tables; JA Solar was named a Top Performer in 11 Scorecards (2014–2026). RETC named JA Solar Overall Highest Achiever in 2023, 2024, 2025, 2026.

Who installs it in Southern California?

Building permits name this series 17 times (Sep 2025 – Sep 2026). The most active licensed installers are South West Builders, Ecosolar Usa Electrical LLC, Capital Energy LLC.

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Qcells — manufacturer datasheet “Q.TRON BLK M-G2+ SERIES 415–440 Wp”.
Silfab Solar — datasheet NTC SIL-420 QD CELL TECHNOLOGY.
Hyundai Energy Solutions — datasheet [US] NF(BK)(HiN) Series (N TOPCon Bifacial) 435~445W.
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).
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) (Sep 2025 – Mar 2026); City of Palmdale (Sep 2025 – Mar 2026); City of Huntington Beach (May 2026); City of Chula Vista (Sep 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).