40.5″ · 1,029 mm wide · 1.38″ (35 mm) frame · 45.8 lb (20.8 kg)

Solar panelSilfab Solar

Silfab Solar SIL-410BG

Name: Silfab Solar SIL-410BG
Brand: Silfab Solar

66 cells, PERC. Power classes 390–420 W in the CEC list.

CEC listed · Nov 1, 2022UL 6173025-yr product + 30-yr performance warrantyPVEL Top Performer 2024PERCInstalled in 5 SoCal permits

Power class

Power (STC)410 WCEC nameplate
Efficiency≈21.4%calculated from area
%/°C Pmax−0.38CEC test: −0.345
Output at year 3089.3%performance warranty

Power classes

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

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
SIL-390BG	390 W	45.05	11.10	37.22	10.48	≈20.3%	364 W	Nov 1, 2022
SIL-395BG	395 W	45.27	11.15	37.43	10.55	≈20.6%	369 W	Nov 1, 2022
SIL-400BG	400 W	45.48	11.20	37.65	10.63	≈20.9%	374 W	Nov 1, 2022
SIL-405BG	405 W	45.70	11.25	37.86	10.70	≈21.1%	378 W	Nov 1, 2022
SIL-410BG	410 W	45.92	11.30	38.08	10.77	≈21.4%	383 W	Nov 1, 2022
SIL-415BG	415 W	46.14	11.35	38.30	10.84	≈21.6%	388 W	Nov 1, 2022
SIL-420BG	420 W	46.36	11.40	38.51	10.91	≈21.9%	393 W	Nov 1, 2022

≈ efficiency = Pmax ÷ panel area 1.918 m² (datasheet size).

Build & dimensions

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

Dimensions73.4 × 40.5 × 1.38 in1,864 × 1,029 × 35 mm
Module area1.92 m² (20.6 ft²)length × width
Weight45.8 lb (20.8 kg)
Cells66 cellsPERC
FrameAnodized Aluminum (Black)
Junction boxUL 3730 Certified, IEC 62790 Certified, IP67 rated

Heat & cold behaviour

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

	Datasheet	CEC listing test
Pmax coefficient γ	−0.38 %/°C	−0.345 %/°C
Voc coefficient β	−0.28 %/°C	−0.262 %/°C
Isc coefficient α	+0.05 %/°C	+0.044 %/°C
Vmp coefficient	≈ −0.42 %/°C	—
Operating cell temperature	NMOT 43.5 °C	NOCT 45.4 °C

Vmp coefficient ≈ γ − α (datasheet); 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
410 W	305.0	42.14	9.16	35.35	8.64

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
390 W	280.7 W	33.99 V × 8.26 A	71.8 W	92%
395 W	284.2 W	34.18 V × 8.31 A	72.7 W	92%
400 W	287.7 W	34.38 V × 8.37 A	73.6 W	92%
405 W	291.3 W	34.57 V × 8.42 A	74.5 W	92%
410 W	294.9 W	34.77 V × 8.48 A	75.5 W	92%
415 W	298.5 W	34.97 V × 8.54 A	76.4 W	92%
420 W	302.2 W	35.17 V × 8.6 A	77.4 W	92%

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

Max system voltage1,000 V
Max series fuse20 A

Packaging: 27 per pallet

Certifications

CEC PV Module List (Oct 7, 2026) · Silfab Solar datasheet

UL 61730IEC 61215IEC 61730IEC 61701IEC 62716IEC 62790ISO 9001

UL 61730CEC listing
IEC 61215datasheet
IEC 61730datasheet
IEC 61701datasheet
IEC 62716datasheet
IEC 62790datasheet
ISO 9001factory, datasheet

Warranty & degradation

Silfab Solar datasheet

Product warranty25 years
Performance warranty30 years
Year 30≥ 89.3%

Independent reliability testing

Kiwa PVEL Scorecard · RETC PV Module Index

2024

PVEL Top Performer

this series

Tests passed as Top Performer

DH, HSS, LID+LETID, MSS, TC

PVEL Scorecards

Silfab Solar named Top Performer, 2017–2025

RETC PV Module Index

Silfab Solar recognized 2023–2026

PVEL Top Performer tests

Year	Product	Tests
2024	SIL-xxxBG	DHHSSLID+LETIDMSSTC

Tested bill of materials

PVEL-tested factoryUSA
Cell technology (tested BOM)p-type PERC
Module design (tested BOM)monofacial - glass//backsheet
Power class range tested380-425W
Hail test ice ball50 mm

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

RETC PV Module Index — Silfab Solar

Year	Recognition
2023	High Achievement in Performance (Ptc-to-stc ratio, LeTID RESISTANCE, Module efficiency)
2024	High Achievement in Performance
2025	Performance High Achiever
2026	Performance 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)

CityColdest air, °CHottest cell, °CString inverter

48.9 V

Voc when cold

per panel

30.2 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.

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	2–12
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	3–12
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	4–12
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	8–10

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	48.9 / 30.2 V	✓ Within range	1.41
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	48.9 / 30.2 V	✗ Not a match: module voltage below MPPT range	1.08
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	48.9 / 30.2 V	✓ Within range	0.53
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	48.9 / 30.2 V	✓ Within range	1.26
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	48.9 / 30.2 V	⚠ Works; below MPPT at peak heat	1.17

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	687	11,682	6.08
Palmdale	1,835	752	12,790	6.69
Chula Vista	1,696	695	11,821	6.11
Huntington Beach	1,643	674	11,452	5.89
Riverside	1,696	695	11,821	6.21
Santa Clarita	1,724	707	12,016	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 SIL-xxxBG panels in SoCal

building permits · CSLB License Master

Permits naming this series

Feb 2024 – Oct 2024

Licensed installers

CSLB license on the permit

Jurisdictions so far

Huntington Beach (3), LA County (unincorp.) (2)

Ecosolar Usa Electrical LLC

Garden Grove · CSLB #1045300

2 installsMay 2024 – Oct 2024Huntington Beach

Bear Solar Inc

Orangevale · CSLB #1028222

1 installFeb 2024Huntington Beach

Permits over time

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 410 W panels

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

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	PVEL (product / brand)	SoCal permits (series)
Silfab Solar SIL-410BG	410 W	≈21.4%	−0.345	45.92	11.3	product 2024	5
Qcells Q.PEAK DUO BLK ML-G10+ 410	410 W	≈20.9%	−0.337	45.37	11.2	product 2022, 2023	221
JA Solar JAM54S31-405/MR	405 W	≈21.3%	−0.329	37.23	13.87	product 2023, 2024	152
REC Group REC410AA Pure	410 W	≈22.9%	−0.256	49	10.35	brand 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

PDF
SIL–410 BG NOT JUST ANOTHER S O L A R PA N E L .
Datasheet · Silfab Solar · Dec 2025
PDF
SIL–420 BG NOT JUST ANOTHER S O L A R PA N E L .
Datasheet · Silfab Solar · Dec 2025
PDF
Warranty – Modules Manufactured 2018 +
Warranty · Silfab Solar · Aug 2025

About Silfab Solar

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

ManufacturerSilfab Solar
Listed in CEC asSilfab Solar Inc.
Websitesilfabsolar.com
PVEL Top Performer (manufacturer)7 Scorecards (2017–2025)
RETC PV Module Index2023, 2024, 2025, 2026
Current panel series in CEC list18

Other series by SoCal permits

SIL-xxxQD · 39SIL-xxxHC+ · 28SIL-xxxBK · 10SIL-xxxHC · 9SIL-xxxNX · 6SIL-xxxNL · 2

Questions & answers

How efficient is the Silfab Solar SIL-410BG?

Calculated from the panel area (1.92 m²): about 21.4% for the 410 W class. 410 W over 1.92 m² equals about 214 W per square meter.

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

PVWatts v8 with typical-year weather gives about 687 kWh per year per 410 W panel in Los Angeles and about 752 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 19.5% 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 = 48.9 V, Vmp at 74 °C cell = 30.2 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 48.9 V vs max input 60 V; Vmp when hot 30.2 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 89.3% after 30 years (manufacturer datasheet).

How big and heavy is it?

73.4 × 40.5 × 1.38 in (1,864 × 1,029 × 35 mm), 45.8 lb (20.8 kg).

Has this panel been reliability-tested?

SIL-xxxBG was a PVEL Top Performer in 2024 (DH, HSS, LID+LETID, MSS, TC).

Sources

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Silfab Solar — datasheet SIL–410 BG NOT JUST ANOTHER S O L A R PA N E L ..
Qcells — manufacturer datasheet “Q.PEAK DUO BLK ML-G10+ ENDURING HIGH PERFORMANCE”.
Silfab Solar — document library on the manufacturer’s website (links above).
Kiwa PVEL — PV Module Reliability Scorecard, Top Performer lists 2017–2025.
RETC — PV Module Index reports 2023–2026.
NLR (formerly NREL) — System Advisor Model CEC inverter library (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 — City of Huntington Beach (Feb 2024 – Oct 2024); Los Angeles County Public Works (EPIC-LA, unincorporated areas) (Jun 2024). 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).