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78.4″ · 1,992 mm
39.1″ · 994 mm wide · 1.5″ (38 mm) frame · 47.4 lb (21.5 kg)
Solar panelSilfab Solar

Silfab Solar SIL-380NT

72 cells, PERC. Power classes 340–420 W in the CEC list; datasheet covers 370–370 W.

CEC listed · Oct 15, 2019UL 6173025-yr product + 30-yr performance warrantyPERCSeen in 1 SoCal permit
Power class
  • Power (STC)380 WCEC nameplate
  • Efficiency≈19.2%calculated from area
  • %/°C Pmax−0.38CEC test: −0.409
  • Output at year 3082.6%performance warranty

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · Silfab Solar datasheet · 17 models
ModelPmaxVoc, VIsc, AVmp, VImp, AEfficiencyPTCCEC listed
SIL340NT340 W46.909.4538.408.86≈17.2%312 WOct 15, 2019
SIL345NT345 W47.309.5238.708.93≈17.4%317 WOct 15, 2019
SIL350NT350 W47.509.6138.909.02≈17.7%321 WOct 15, 2019
SIL355NT355 W47.809.6539.149.10≈17.9%326 WOct 15, 2019
SIL360NT360 W47.909.7139.309.20≈18.2%331 WOct 15, 2019
SIL365NT365 W48.109.8139.509.26≈18.4%335 WOct 15, 2019
SIL370NT370 W48.209.9339.709.39≥18.7%340 WOct 15, 2019
SIL375NT375 W48.309.9639.759.45≈18.9%345 WOct 15, 2019
SIL-380NT380 W47.8810.0938.679.85≈19.2%351 WOct 15, 2019
SIL-385NT385 W48.0810.1838.959.90≈19.4%356 WAug 3, 2020
SIL-390NT390 W48.2910.2739.249.95≈19.7%361 WAug 3, 2020
SIL-395NT395 W48.4910.3639.5310.00≈19.9%365 WAug 3, 2020
SIL-400NT400 W48.6910.4539.8010.05≈20.2%370 WAug 3, 2020
SIL-405NT405 W48.8910.5440.1010.10≈20.5%375 WAug 3, 2020
SIL-410NT410 W49.0910.6340.3810.15≈20.7%380 WAug 3, 2020
SIL-415NT415 W49.3010.7240.6710.20≈21.0%384 WAug 3, 2020
SIL-420NT420 W49.5010.8140.9610.25≈21.2%389 WAug 3, 2020
≈ efficiency = Pmax ÷ panel area 1.98 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−0.38 %/°C−0.409 %/°C
Voc coefficient β−0.30 %/°C−0.293 %/°C
Isc coefficient α+0.03 %/°C+0.022 %/°C
Vmp coefficient≈ −0.41 %/°C—
Operating cell temperatureNMOT 44 °CNOCT 44.3 °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
370 W271.043.707.9035.107.70

Away from lab conditions — CEC listing test points

ClassPmax at NOCTVmp × Imp at NOCTPmax at 200 W/m²Low-light efficiency vs STC
340 W237.9 W34.64 V × 6.87 A63.4 W93%
345 W241.6 W34.91 V × 6.92 A64.4 W93%
350 W245.3 W35.1 V × 6.99 A65.4 W93%
355 W249 W35.31 V × 7.05 A66.3 W93%
360 W252.8 W35.46 V × 7.13 A67.3 W94%
365 W255.7 W35.64 V × 7.18 A68.1 W93%
370 W260.6 W35.82 V × 7.28 A69.4 W94%
375 W262.5 W35.86 V × 7.32 A69.9 W93%
380 W274.4 W35.68 V × 7.69 A72.1 W95%
385 W277.9 W35.94 V × 7.73 A73 W95%
390 W281.3 W36.21 V × 7.77 A74 W95%
395 W284.9 W36.47 V × 7.81 A74.9 W95%
400 W288.3 W36.73 V × 7.85 A75.8 W95%
405 W292 W37 V × 7.89 A76.7 W95%
410 W295.5 W37.27 V × 7.93 A77.7 W95%
415 W299.1 W37.53 V × 7.97 A78.6 W95%
420 W302.7 W37.79 V × 8.01 A79.6 W95%
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: 25 per pallet

Certifications

CEC PV Module List (Oct 7, 2026) · Silfab Solar datasheet
UL 61730UL 1703IEC 61730IEC 61701IEC 62716IEC 62804IEC 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)
51.2 V
Voc when cold
per panel
30.9 V
Vmp when hot
per panel
11
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 Vdatasheet2–11
Solis (Ginlong) S6-EH1P10K-H-US600 V80–520 Vdatasheet3–11
Solis (Ginlong) Solis-1P7.6K-4G-US600 V100–500 Vdatasheet4–11
Qcells Q.VOLT H7.6SX498 V234–498 VCEC test window8–9

Microinverters (one per panel)

MicroinverterRecommended module powerMax DC inputMPPTVoc cold / Vmp hotCheckDC/AC
Enphase IQ8PLUS-72-2-US235–440 W60 V29–45 V51.2 / 30.9 V✓ Within range1.31
Enphase IQ8X-80-M-US320–540 W79.5 V43–60 V51.2 / 30.9 V✗ Not a match: module voltage below MPPT range1
APsystems (Alt Power System) DS3-L265–570 W60 V28–45 V51.2 / 30.9 V✓ Within range0.49
Enphase IQ8M-72-2-US260–460 W60 V30–45 V51.2 / 30.9 V✓ Within range1.17
Enphase IQ8A-72-2-US295–500 W60 V32–45 V51.2 / 30.9 V⚠ Works; below MPPT at peak heat1.09
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 Angeles1,67663711,4646.08
Palmdale1,83569712,5516.69
Chula Vista1,69664411,6016.11
Huntington Beach1,64362411,2385.89
Riverside1,69664411,6016.21
Santa Clarita1,72465511,7926.28
748Jan749Feb961Mar1,062Apr1,049May1,114Jun1,174Jul1,187Aug1,038Sep916Oct787Nov681DeckWh 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.

Compare with similar 380 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-380NT380 W≈19.2%−0.40947.8810.09brand 7×1
Qcells Q.PEAK DUO BLK ML-G10+ 380380 W≈19.4%−0.36245.1611.01product 2022, 2023221
JA Solar JAM54S31-385/MR385 W≈20.3%−0.32936.7113.52product 2023, 2024152
REC Group REC380AA Pure380 W≈21.2%−0.25648.410.17brand 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-xxxHC+ · 28SIL-xxxBK · 10SIL-xxxHC · 9SIL-xxxNX · 6SIL-xxxBG · 5

Questions & answers

How efficient is the Silfab Solar SIL-380NT?

Calculated from the panel area (1.98 m²): about 19.2% for the 380 W class. 380 W over 1.98 m² equals about 192 W per square meter.

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

PVWatts v8 with typical-year weather gives about 637 kWh per year per 380 W panel in Los Angeles and about 697 kWh in Palmdale (20° roof, facing south, 14% system losses).

How much power does it lose on a hot roof?

With γ = −0.38 %/°C, at a 77 °C cell temperature (hottest modeled hour in Palmdale) output is about 19.7% 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 = 51.2 V, Vmp at 74 °C cell = 30.9 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 51.2 V vs max input 60 V; Vmp when hot 30.9 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?

78.4 × 39.1 × 1.5 in (1,992 × 994 × 38 mm), 47.4 lb (21.5 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 SIL-370 NT JUST -IN-.
  3. Silfab Solar — datasheet SIL-380 NT JUST -IN-.
  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) (Nov 2021). Equipment matched from permit descriptions by model number.
  12. Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).