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67.8″ · 1,721 mm
44.6″ · 1,133 mm wide · 1.38″ (35 mm) frame · 46.3 lb (21 kg)
Solar panelSilfab Solar

Silfab Solar SIL-440QD

108 half-cut cells, N-type TOPCon. Power classes 400–440 W in the CEC list.

CEC listed · Nov 1, 2023UL 6173025-yr product + 30-yr performance warrantyN-type TOPConInstalled in 39 SoCal permits
Power class
  • Power (STC)440 WCEC nameplate
  • Efficiency≈22.6%calculated from area
  • %/°C Pmax−0.29CEC test: −0.294
  • Output at year 3089.3%performance warranty

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · 9 models
ModelPmaxVoc, VIsc, AVmp, VImp, AEfficiencyPTCCEC listed
SIL-400QD400 W38.7112.7832.7412.22≈20.5%377 WNov 1, 2023
SIL-405QD405 W38.7412.9632.8312.34≈20.8%382 WNov 1, 2023
SIL-410QD410 W38.7713.1332.9112.46≈21.0%386 WNov 1, 2023
SIL-415QD415 W38.8113.3132.9912.58≈21.3%391 WNov 1, 2023
SIL-420QD420 W38.8413.4933.0812.70≈21.5%396 WNov 1, 2023
SIL-425QD425 W38.8813.6833.1612.82≈21.8%401 WNov 1, 2023
SIL-430QD430 W38.9113.8733.2512.93≈22.1%406 WNov 1, 2023
SIL-435QD435 W38.9414.0533.3313.05≈22.3%411 WNov 1, 2023
SIL-440QD440 W38.9714.2533.4213.17≈22.6%416 WNov 1, 2023
≈ efficiency = Pmax ÷ panel area 1.95 m² (datasheet size).

Build & dimensions

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

Heat & cold behaviour

Silfab Solar datasheet · CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation
DatasheetCEC listing test
Pmax coefficient γ−0.29 %/°C−0.294 %/°C
Voc coefficient β−0.24 %/°C−0.238 %/°C
Isc coefficient α+0.04 %/°C+0.040 %/°C
Vmp coefficient≈ −0.33 %/°C—
Operating cell temperatureNMOT 45 °CNOCT 45.9 °C
Vmp coefficient ≈ γ − α (datasheet); used only for the hot-roof voltage estimate.

At normal operating conditions (NOCT, 800 W/m²) — datasheet

ClassPmax, WVoc, VIsc, AVmp, VImp, A
420 W313.036.5210.8530.8610.15

Away from lab conditions — CEC listing test points

ClassPmax at NOCTVmp × Imp at NOCTPmax at 200 W/m²Low-light efficiency vs STC
400 W286.4 W30.2 V × 9.48 A73.8 W92%
405 W289.9 W30.28 V × 9.57 A74.7 W92%
410 W293.4 W30.36 V × 9.66 A75.6 W92%
415 W297 W30.44 V × 9.76 A76.5 W92%
420 W300.6 W30.51 V × 9.85 A77.5 W92%
425 W304.1 W30.59 V × 9.94 A78.4 W92%
430 W307.7 W30.67 V × 10.03 A79.3 W92%
435 W311.3 W30.75 V × 10.12 A80.2 W92%
440 W315 W30.83 V × 10.22 A81.2 W92%
Pmax = Vmp × Imp from the CEC listing; low-light efficiency = Pmax at 200 W/m² ÷ (20% of STC Pmax).

Electrical & strength ratings

Silfab Solar datasheet
Packaging: 26 per pallet

Certifications

CEC PV Module List (Oct 7, 2026) · Silfab Solar datasheet
UL 61730IEC 61215IEC 61730IEC 61701IEC 62716IEC 62790ISO 9001

Warranty & degradation

Silfab Solar datasheet

Independent reliability testing

Kiwa PVEL Scorecard · RETC PV Module Index
7
PVEL Scorecards
Silfab Solar named Top Performer, 2017–2025
4
RETC PV Module Index
Silfab Solar recognized 2023–2026
This exact series is not listed in published PVEL Top Performer tables. Results below are for the manufacturer.

RETC PV Module Index — Silfab Solar

YearRecognition
2023High Achievement in Performance (Ptc-to-stc ratio, LeTID RESISTANCE, Module efficiency)
2024High Achievement in Performance
2025Performance High Achiever
2026Performance discipline high achiever (Lid); Quality discipline high achiever (BOM verification); Reliability discipline high achiever (Pid, Sdml); Test Category High Achiever

Inverter compatibility & string sizing

Silfab 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)
41.1 V
Voc when cold
per panel
28 V
Vmp when hot
per panel
14
Max panels / string
max DC 600 V
3
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

InverterMax DC inputMPPTWindow sourcePanels per string
Tesla 1538000-xx-y600 V60–480 Vdatasheet3–14
Solis (Ginlong) S6-EH1P10K-H-US600 V80–520 Vdatasheet3–14
Solis (Ginlong) Solis-1P7.6K-4G-US600 V100–500 Vdatasheet4–14
Qcells Q.VOLT H7.6SX498 V234–498 VCEC test window9–12

Microinverters (one per panel)

MicroinverterRecommended module powerMax DC inputMPPTVoc cold / Vmp hotCheckDC/AC
Enphase IQ8PLUS-72-2-US235–440 W60 V29–45 V41.1 / 28 V⚠ Works; below MPPT at peak heat1.52
Enphase IQ8X-80-M-US320–540 W79.5 V43–60 V41.1 / 28 V✗ Not a match: module voltage below MPPT range1.16
APsystems (Alt Power System) DS3-L265–570 W60 V28–45 V41.1 / 28 V✓ Within range0.56
Enphase IQ8M-72-2-US260–460 W60 V30–45 V41.1 / 28 V⚠ Works; below MPPT at peak heat1.35
Enphase IQ8A-72-2-US295–500 W60 V32–45 V41.1 / 28 V⚠ Works; below MPPT at peak heat1.26
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
CitykWh / kW / yrkWh / panel / yrkWh / system / yrSun, kWh/m²/day
Los Angeles1,67673711,7996.08
Palmdale1,83580712,9186.69
Chula Vista1,69674611,9406.11
Huntington Beach1,64372311,5675.89
Riverside1,69674611,9406.21
Santa Clarita1,72475912,1376.28
770Jan771Feb989Mar1,093Apr1,079May1,147Jun1,208Jul1,222Aug1,069Sep943Oct810Nov701DeckWh per month · Los Angeles
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 SIL-xxxQD panels in SoCal

building permits · CSLB License Master
39
Permits naming this series
Aug 2024 – Oct 2026
10
Licensed installers
CSLB license on the permit
4
Jurisdictions so far
LA County (unincorp.) (19), Palmdale (11), Chula Vista (7), Huntington
SS
Stellar Solar Electric
Oceanside · CSLB #749095
5 installsSep 2026 – Oct 2026Chula Vista
CE
Capital Energy LLC
Tempe · CSLB #1142165
4 installsSep 2026Palmdale
VS
Vibe Solar
Lancaster · CSLB #1036012
3 installsMar 2026 – Apr 2026Palmdale
CR
Ces Roofing
San Dimas · CSLB #998787
1 installMay 2026Palmdale
ES
Elbac Solar
Corona · CSLB #1072844
1 installJun 2026Palmdale
EE
Elevation Energy Solutions Inc
Sacramento · CSLB #1130477
1 installSep 2026Palmdale
GJ
Ga Ju Cooling Systems
Los Angeles · CSLB #1088734
1 installFeb 2026Palmdale
PH
Powur Home Construction
Albuquerque · CSLB #1060243
1 installAug 2026Chula Vista
S
Sunlux
Corona · CSLB #1008374
1 installMay 2026Huntington Beach
S
Sunrun
Lehi · CSLB #750184
1 installMay 2025Huntington Beach

Permits over time

2Q3 ’240Q4 ’243Q1 ’252Q2 ’255Q3 ’253Q4 ’253Q1 ’267Q2 ’2613Q3 ’261Q4 ’26permits per quarter

Power class named in permit

440 W
32
430 W
5
420 W
2

Top ZIP codes

  • ZIP 935516
  • ZIP 913814
  • ZIP 935503
  • ZIP 935523
  • ZIP 910013
  • ZIP 902652
  • ZIP 912142
  • ZIP 913612
  • Other ZIP codes4

Typical system

median 8.8 kW, 20 panels (n = 36)

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 IQ8M
9
Enphase IQ8HC
4

Batteries

Tesla Powerwall 3
25
Tesla Powerwall 3 Expansion
10
Enphase IQ Battery 10C
4
Enphase IQ Battery 5P
3
Number of permits naming both this panel series and the product; 36 of 39 permits list other equipment.

Compare with similar 440 W panels

CEC PV Module List (Oct 7, 2026) · datasheets · Kiwa PVEL Scorecard · building permits
PanelPmaxEfficiencyγ Pmax (CEC)Voc, VIsc, AWarrantyPVEL (product / brand)SoCal permits (series)
Silfab Solar SIL-440QD440 W≈22.6%−0.29438.9714.2525 / 30 yrbrand 7×39
Qcells Q.TRON BLK M-G2+ 440440 W≥22.5%−0.27639.8813.925 / 25 yrbrand 11× (2016–2026)40
Hyundai Energy Solutions HiN-T440NF(BK)440 W≈22.7%−0.29838.814.3925 / 30 yrbrand 5× (2017–2025)37
REC Group REC440AA Pure-RX440 W≈21.8%−0.24864.88.74—brand 9× (2016–2025)33
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.

Documents

manufacturer documents

About Silfab Solar

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

Other series by SoCal permits

SIL-xxxHC+ · 28SIL-xxxBK · 10SIL-xxxHC · 9SIL-xxxNX · 6SIL-xxxBG · 5SIL-xxxNL · 2

Questions & answers

How efficient is the Silfab Solar SIL-440QD?

Calculated from the panel area (1.95 m²): about 22.6% for the 440 W class. 440 W over 1.95 m² equals about 226 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 = −0.29 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 15% 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 = 41.1 V, Vmp at 74 °C cell = 28 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 41.1 V vs max input 60 V; Vmp when hot 28 V vs MPPT low 28 V; recommended module power 265–570 W. Confirm on the microinverter maker’s compatibility list.

What does the warranty cover?

25 years on the product and 30 years on performance: at least 89.3% after 30 years (manufacturer datasheet).

How big and heavy is it?

67.8 × 44.6 × 1.38 in (1,721 × 1,133 × 35 mm), 46.3 lb (21 kg).

Has this panel been reliability-tested?

This exact series is not in published PVEL Top Performer tables; Silfab Solar was named a Top Performer in 7 Scorecards (2017–2025).

Sources

  1. California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
  2. Silfab Solar — datasheet NTC SIL-420 QD CELL TECHNOLOGY.
  3. Silfab Solar — manufacturer datasheet “NTC SIL-420/430 QD TOPCON CELL TECHNOLOGY”.
  4. Qcells — manufacturer datasheet “Q.TRON BLK M-G2+ SERIES 415–440 Wp”.
  5. Hyundai Energy Solutions — datasheet [US] NF(BK)(HiN) Series (N TOPCon Bifacial) 435~445W.
  6. Silfab Solar — document library on the manufacturer’s website (links above).
  7. Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2017–2025.
  8. RETC — PV Module Index reports 2023–2026.
  9. NLR (formerly NREL) — System Advisor Model CEC inverter library (version 2026.7.3).
  10. NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Chula Vista, Huntington Beach, Riverside, Santa Clarita.
  11. Inverter datasheets — APsystems (Alt Power System), Enphase, Solis (Ginlong), Tesla (manufacturer documents).
  12. Building permits — Los Angeles County Public Works (EPIC-LA, unincorporated areas) (Aug 2024 – Jul 2026); City of Palmdale (Feb 2026 – Sep 2026); City of Chula Vista (Aug 2026 – Oct 2026); City of Huntington Beach (May 2025 – May 2026). Equipment matched from permit descriptions by model number.
  13. Contractors State License Board — License Master (contractor names and license status), as of Oct 5, 2026.
  14. Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).