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75.4″ · 1,914 mm
40.8″ · 1,036 mm wide · 1.38″ (35 mm) frame · 47 lb (21.3 kg)
Solar panelSilfab Solar

Silfab Solar SIL-400HC+

132 half-cut cells, PERC. Power classes 380–420 W in the CEC list; datasheet covers 400–410 W.

CEC listed · Feb 1, 2023UL 6173025-yr product + 30-yr performance warrantyPVEL Top Performer 2023PERCInstalled in 28 SoCal permits
Power class
  • Power (STC)400 WCEC nameplate
  • Efficiency≥20.2%datasheet minimum
  • %/°C Pmax−0.36CEC test: −0.402
  • Output at year 3082.6%performance warranty

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · Silfab Solar datasheet · 9 models
ModelPmaxVoc, VIsc, AVmp, VImp, AEfficiencyPTCCEC listed
SIL-380HC+380 W45.3510.2838.399.90≈19.2%348 WFeb 1, 2023
SIL-385HC+385 W45.3910.4238.4910.01≈19.4%353 WFeb 1, 2023
SIL-390HC+390 W45.4310.5638.5910.11≈19.7%358 WFeb 1, 2023
SIL-395HC+395 W45.4710.7138.6910.21≈19.9%363 WFeb 1, 2023
SIL-400HC+400 W45.5110.8538.7910.32≥20.2%367 WFeb 1, 2023
SIL-405HC+405 W45.5511.0038.8910.41≈20.4%372 WFeb 1, 2023
SIL-410HC+410 W45.5911.1538.9910.52≥20.7%377 WFeb 1, 2023
SIL-415HC+415 W45.6311.3039.0910.62≈20.9%382 WFeb 1, 2023
SIL-420HC+420 W45.6711.4639.1910.72≈21.2%386 WFeb 1, 2023
≈ efficiency = Pmax ÷ panel area 1.983 m² (datasheet size) for classes outside the datasheet.

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−0.36 %/°C−0.402 %/°C
Voc coefficient β−0.28 %/°C−0.303 %/°C
Isc coefficient α+0.06 %/°C+0.031 %/°C
Vmp coefficient≈ −0.42 %/°C—
Operating cell temperatureNMOT 45 °CNOCT 46.3 °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
400 W298.042.698.7536.058.27
410 W306.042.768.9936.248.43

Away from lab conditions — CEC listing test points

ClassPmax at NOCTVmp × Imp at NOCTPmax at 200 W/m²Low-light efficiency vs STC
380 W275.1 W34.87 V × 7.89 A65.6 W86%
385 W278.6 W34.96 V × 7.97 A66.4 W86%
390 W282.2 W35.05 V × 8.05 A67.3 W86%
395 W285.8 W35.14 V × 8.13 A68.2 W86%
400 W289.6 W35.23 V × 8.22 A69.1 W86%
405 W293 W35.32 V × 8.3 A69.9 W86%
410 W296.7 W35.41 V × 8.38 A70.8 W86%
415 W300.3 W35.5 V × 8.46 A71.6 W86%
420 W303.9 W35.59 V × 8.54 A72.5 W86%
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 datasheets
UL 61730IEC 61215IEC 61730IEC 62716IEC 62790Fire rating Type 2 (UL 61730)ISO 9001

Warranty & degradation

Silfab Solar datasheet

Independent reliability testing

Kiwa PVEL Scorecard · RETC PV Module Index
2023
PVEL Top Performer
this series
3
Tests passed as Top Performer
LID+LETID, MSS, PID
7
PVEL Scorecards
Silfab Solar named Top Performer, 2017–2025
4
RETC PV Module Index
Silfab Solar recognized 2023–2026

PVEL Top Performer tests

YearProductTests
2023SIL-xxxHC+LID+LETIDMSSPID
2023SIL-xxxHCLID+LETIDMSSPID

Tested bill of materials

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

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)
48.4 V
Voc when cold
per panel
30.7 V
Vmp when hot
per panel
12
Max panels / string
max DC 600 V
2
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 Vdatasheet2–12
Solis (Ginlong) S6-EH1P10K-H-US600 V80–520 Vdatasheet3–12
Solis (Ginlong) Solis-1P7.6K-4G-US600 V100–500 Vdatasheet4–12
Qcells Q.VOLT H7.6SX498 V234–498 VCEC test window8–10

Microinverters (one per panel)

MicroinverterRecommended module powerMax DC inputMPPTVoc cold / Vmp hotCheckDC/AC
Enphase IQ8PLUS-72-2-US235–440 W60 V29–45 V48.4 / 30.7 V✓ Within range1.38
Enphase IQ8X-80-M-US320–540 W79.5 V43–60 V48.4 / 30.7 V✗ Not a match: module voltage below MPPT range1.05
APsystems (Alt Power System) DS3-L265–570 W60 V28–45 V48.4 / 30.7 V✓ Within range0.51
Enphase IQ8M-72-2-US260–460 W60 V30–45 V48.4 / 30.7 V✓ Within range1.23
Enphase IQ8A-72-2-US295–500 W60 V32–45 V48.4 / 30.7 V⚠ Works; below MPPT at peak heat1.15
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 Angeles1,67667012,0676.08
Palmdale1,83573413,2126.69
Chula Vista1,69667812,2116.11
Huntington Beach1,64365711,8305.89
Riverside1,69667812,2116.21
Santa Clarita1,72469012,4136.28
788Jan788Feb1,012Mar1,117Apr1,104May1,173Jun1,236Jul1,250Aug1,093Sep964Oct829Nov717DeckWh 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-xxxHC+ panels in SoCal

building permits · CSLB License Master
28
Permits naming this series
Mar 2023 – Jun 2024
1
Licensed installers
CSLB license on the permit
2
Jurisdictions so far
LA County (unincorp.) (27), Palmdale (1)
SS
Semper Solaris
El Cajon · CSLB #978152
1 installAug 2023Palmdale

Permits over time

1Mar ’2312May35Jul37Sep01Nov01Jan ’2420Mar01May1permits per month

Power class named in permit

400 W
23
410 W
5

Top ZIP codes

  • ZIP 910014
  • ZIP 902653
  • ZIP 913012
  • ZIP 917462
  • ZIP 902502
  • ZIP 906052
  • ZIP 913612
  • Other ZIP codes11

Typical system

median 8 kW, 20 panels (n = 20)

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
20

Inverters

Tesla Tesla Solar Inverter
5

Batteries

Enphase IQ Battery 5P
5
Tesla Powerwall 2
4
Tesla Powerwall+
3
Enphase IQ Battery
2
Number of permits naming both this panel series and the product; 28 of 28 permits list other equipment.

Other versions of this panel

CEC PV Module List (Oct 7, 2026) · building permits
Silfab Solar SIL-xxxHC
Same product line · 360–385 W · listed 2021 · 9 SoCal permits

Compare with similar 400 W panels

CEC PV Module List (Oct 7, 2026) · Qcells datasheet · Kiwa PVEL Scorecard · building permits
PanelPmaxEfficiencyγ Pmax (CEC)Voc, VIsc, APVEL (product / brand)SoCal permits (series)
Silfab Solar SIL-400HC+400 W≥20.2%−0.40245.5110.85product 202328
Qcells Q.PEAK DUO BLK ML-G10+ 400400 W≥20.4%−0.36245.311.14product 2022, 2023221
JA Solar JAM54S31-400/MR400 W≈21.1%−0.32937.0713.79product 2023, 2024152
REC Group REC400AA Pure400 W≈22.3%−0.25648.810.25brand 9× (2016–2025)66
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-xxxQD · 39SIL-xxxBK · 10SIL-xxxHC · 9SIL-xxxNX · 6SIL-xxxBG · 5SIL-xxxNL · 2

Questions & answers

How efficient is the Silfab Solar SIL-400HC+?

The Silfab Solar datasheet guarantees at least 20.2% module efficiency for the 400 W class (up to 20.7% for 410 W). 400 W over 1.98 m² equals about 202 W per square meter.

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

PVWatts v8 with typical-year weather gives about 670 kWh per year per 400 W panel in Los Angeles and about 734 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.36 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 18.6% 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 2–12 panels per string (Voc at 2 °C = 48.4 V, Vmp at 74 °C cell = 30.7 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 48.4 V vs max input 60 V; Vmp when hot 30.7 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?

25 years on the product and 30 years on performance: at least 82.6% after 30 years (manufacturer datasheet).

How big and heavy is it?

75.4 × 40.8 × 1.38 in (1,914 × 1,036 × 35 mm), 47 lb (21.3 kg).

Has this panel been reliability-tested?

SIL-xxxHC+ was a PVEL Top Performer in 2023 (LID+LETID, MSS, PID).

Sources

  1. California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
  2. Silfab Solar — datasheet SIL-400/410 HC+ DIRECT FROM THE SOURCE. Designed to outperform..
  3. Silfab Solar — datasheet SIL-410 HC+ DIRECT FROM THE SOURCE. Designed to outperform..
  4. Qcells — manufacturer datasheet “Q.PEAK DUO BLK ML-G10+ ENDURING HIGH PERFORMANCE”.
  5. Silfab Solar — document library on the manufacturer’s website (links above).
  6. Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2017–2025.
  7. RETC — PV Module Index reports 2023–2026.
  8. NLR (formerly NREL) — System Advisor Model CEC inverter library (version 2026.7.3).
  9. NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Chula Vista, Huntington Beach, Riverside, Santa Clarita.
  10. Inverter datasheets — APsystems (Alt Power System), Enphase, Solis (Ginlong), Tesla (manufacturer documents).
  11. Building permits — Los Angeles County Public Works (EPIC-LA, unincorporated areas) (Mar 2023 – Jun 2024); City of Palmdale (Aug 2023). Equipment matched from permit descriptions by model number.
  12. Contractors State License Board — License Master (contractor names and license status), as of Oct 5, 2026.
  13. Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).