44.6″ · 1,134 mm wide · 1.18″ (30 mm) frame · 52.9 lb (24 kg)

Solar panelSEG Solar

SEG Solar SEG-440-BTD-BG

Name: SEG Solar SEG-440-BTD-BG
Brand: SEG Solar

108 half-cut cells, bifacial, 2.0 mm ar coating semi-tempered glass / low iron. Power classes 420–525 W in the CEC list.

CEC listed · Feb 1, 2024UL 61730BifacialPVEL Top Performer 2023, 2024, 2025, 2026Installed in 8 SoCal permits

Power class

Power (STC)440 WCEC nameplate
Efficiency≈22.5%calculated from area
%/°C Pmax−0.262CEC listing test
PTC / STC95.6%PTC 421 W (CEC)

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 15 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
SEG-420-BTD-BG	420 W	38.50	13.83	31.90	13.17	≈21.5%	395 W	Feb 1, 2024
SEG-425-BTD-BG	425 W	38.70	13.91	32.10	13.24	≈21.8%	400 W	Feb 1, 2024
SEG-430-BTD-BG	430 W	38.90	13.99	32.30	13.32	≈22.0%	408 W	Feb 1, 2024
SEG-435-BTD-BG	435 W	39.10	14.07	32.50	13.39	≈22.3%	410 W	Feb 1, 2024
SEG-440-BTD-BG	440 W	39.28	13.92	33.32	13.20	≈22.5%	421 W	May 21, 2025
SEG-445-BTD-BG	445 W	39.44	13.98	33.48	13.29	≈22.8%	426 W	May 21, 2025
SEG-450-BTD-BG	450 W	39.60	14.04	33.64	13.38	≈23.0%	431 W	Apr 1, 2026
SEG-455-BTD-BG	455 W	39.76	14.11	33.80	13.46	≈23.3%	436 W	Apr 1, 2026
SEG-495-BTD-BG	495 W	39.90	15.82	33.10	14.96	≈25.3%	471 W	May 1, 2026
SEG-500-BTD-BG	500 W	40.10	15.88	33.30	15.02	≈25.6%	476 W	May 1, 2026
SEG-505-BTD-BG	505 W	40.30	15.95	33.50	15.08	≈25.9%	481 W	May 1, 2026
SEG-510-BTD-BG	510 W	40.50	16.01	33.70	15.14	≈26.1%	486 W	May 1, 2026
SEG-515-BTD-BG	515 W	40.70	16.07	33.90	15.20	≈26.4%	491 W	May 1, 2026
SEG-520-BTD-BG	520 W	40.90	16.13	34.10	15.25	≈26.6%	496 W	May 1, 2026
SEG-525-BTD-BG	525 W	41.10	16.20	34.30	15.31	≈26.9%	500 W	May 1, 2026

≈ efficiency = Pmax ÷ panel area 1.953 m² (datasheet size).

Build & dimensions

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

Dimensions67.8 × 44.6 × 1.18 in1,722 × 1,134 × 30 mm
Module area1.95 m² (21 ft²)length × width
Weight52.9 lb (24 kg)
Cells108 half-cut cells
Back cover2.0 mm AR coating semi-tempered glass / low iron
FrameBlack anodized aluminium alloy
Junction boxIP68 / 3 diodes
Cable / connectorPortrait: 400 mm(+) / 200 mm(-) · PV-CO02-xy / MC4

Heat & cold behaviour

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

	Datasheet	CEC listing test
Pmax coefficient γ	—	−0.262 %/°C
Voc coefficient β	—	−0.232 %/°C
Isc coefficient α	—	+0.044 %/°C
Vmp coefficient	≈ −0.31 %/°C	—
Operating cell temperature	NMOT 45 °C	NOCT 43.3 °C

Vmp coefficient ≈ γ − α (CEC); 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
420 W	316.0	36.58	11.06	29.99	10.54
425 W	320.0	36.77	11.13	30.21	10.59
430 W	324.0	36.96	11.19	30.41	10.66

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
420 W	306.8 W	30.45 V × 10.07 A	77.1 W	92%
425 W	310.4 W	30.65 V × 10.13 A	78 W	92%
430 W	322.6 W	31.87 V × 10.12 A	83.3 W	97%
435 W	317.8 W	31.03 V × 10.24 A	79.9 W	92%
440 W	328.9 W	32.15 V × 10.23 A	83.4 W	95%
445 W	332.7 W	32.3 V × 10.3 A	84.3 W	95%
450 W	336.5 W	32.46 V × 10.37 A	85.3 W	95%
455 W	340.2 W	32.61 V × 10.43 A	86.2 W	95%
495 W	372.1 W	31.03 V × 11.99 A	95.5 W	96%
500 W	375.9 W	31.22 V × 12.04 A	96.5 W	96%
505 W	379.6 W	31.4 V × 12.09 A	97.4 W	96%
510 W	383.4 W	31.59 V × 12.14 A	98.4 W	96%
515 W	387.2 W	31.78 V × 12.19 A	99.4 W	96%
520 W	390.8 W	31.96 V × 12.23 A	100.3 W	96%
525 W	394.6 W	32.15 V × 12.27 A	101.3 W	96%

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

Electrical & strength ratings

SEG Solar datasheet

Max system voltage1,500 V
Max series fuse30 A
Module temperature−40 °F to +185 °F−40 °C to +85 °C

Packaging: 36 per pallet · 216 per container

Independent reliability testing

Kiwa PVEL Scorecard · RETC PV Module Index

2023, 2024, 2025, 2026

PVEL Top Performer

this series

Tests passed as Top Performer

DH, HSS, LID+LETID, MSS, PID, TC

PVEL Scorecards

SEG Solar named Top Performer, 2022–2026

RETC PV Module Index

SEG Solar recognized 2023–2024

PVEL Top Performer tests

Year	Product	Tests
2024	SEG-xxx-BTD-BG	DHLID+LETIDMSSPIDTC
2025	SEG-xxx-BTD-BG	LID+LETIDTC
2026	SEG-xxx-BTD-BG	DHHSSLID+LETIDMSSPIDTC
2023	SEG-XXX-BTD-BG	PID

Tested bill of materials

PVEL-tested factoryChina
Cell technology (tested BOM)n-type TOPCon
Module design (tested BOM)bifacial - glass//glass
Power class range tested430-475W
Hail test ice ball45 mm

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

RETC PV Module Index — SEG Solar

Year	Recognition
2023	High Achievement in Performance (LeTID RESISTANCE)
2024	Test Category High Achiever

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 SEG-xxx-BTD-BG panels in SoCal

building permits · CSLB License Master

Permits naming this series

Aug 2025 – Sep 2026

Licensed installers

CSLB license on the permit

Jurisdictions so far

LA County (unincorp.) (4), Chula Vista (2), Huntington Beach (2)

Anchor Builders Inc

Santa Ana · CSLB #1029392

2 installsAug 2025Huntington Beach

Baker Home Energy

Escondido · CSLB #858088

1 installSep 2026Chula Vista

Solar Symphony Construction Inc

Escondido · CSLB #988146

1 installMar 2026Chula Vista

Permits over time

Power class named in permit

440 W

420 W

Typical system

median 5.7 kW, 13 panels (n = 6)

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.

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	Size	Warranty	PVEL (product / brand)	SoCal permits (series)
SEG Solar SEG-440-BTD-BG	440 W	≈22.5%	−0.262	39.28	13.92	67.8 × 44.6 in	—	product 2023, 2024, 2025, 2026	8
Qcells Q.TRON BLK M-G2+ 440	440 W	≥22.5%	−0.276	39.88	13.9	67.8 × 44.6 in	25 / 25 yr	brand 11× (2016–2026)	40
Silfab Solar SIL-440QD	440 W	≈22.6%	−0.294	38.97	14.25	67.8 × 44.6 in	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 SEG Solar

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

ManufacturerSEG Solar
Listed in CEC asSEG Solar Inc.
Websitesegsolar.com
PVEL Top Performer (manufacturer)5 Scorecards (2022–2026)
RETC PV Module Index2023, 2024
Current panel series in CEC list23

Other series by SoCal permits

SEG-xxx-BMD-HV · 20SEG-xxx-BHC-BGSEG-xxx-BTA-BGSEG-xxx-BTA-HVSEG-xxx-BTB-BGSEG-xxx-BTB-HV

Questions & answers

How efficient is the SEG Solar SEG-440-BTD-BG?

Calculated from the panel area (1.95 m²): about 22.5% for the 440 W class. 440 W over 1.95 m² equals about 225 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 = −0.262 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 13.6% 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 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.

How big and heavy is it?

67.8 × 44.6 × 1.18 in (1,722 × 1,134 × 30 mm), 52.9 lb (24 kg).

Is it bifacial?

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

Has this panel been reliability-tested?

SEG-xxx-BTD-BG was a PVEL Top Performer in 2024, 2025, 2026 (DH, HSS, LID+LETID, MSS, PID, TC).

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
SEG Solar — manufacturer datasheet “XXXTFHTPMBSDPN YUKON/Series )BMG$FMM/5ZQF501$PO”.
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 2022–2026.
RETC — PV Module Index reports 2023–2024.
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) (May 2026); City of Chula Vista (Mar 2026 – Sep 2026); City of Huntington Beach (Aug 2025). 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).