39.4″ · 1,000 mm wide · 1.5″ (38 mm) frame · 41 lb (18.6 kg)

Solar panelSilfab Solar

Silfab Solar SIL-320NL

Name: Silfab Solar SIL-320NL
Brand: Silfab Solar

60 cells, PERC. Power classes 285–345 W in the CEC list; datasheet covers 310–310 W.

CEC listed · Oct 1, 2019UL 6173025-yr product + 30-yr performance warrantyPERCSeen in 2 SoCal permits

Power class

Power (STC)320 WCEC nameplate
Efficiency≈18.8%calculated from area
%/°C Pmax−0.36CEC test: −0.366
Output at year 3082.6%performance warranty

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · Silfab Solar datasheet · 13 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
SIL285NL	285 W	39.10	9.47	32.00	8.91	≈16.8%	258 W	Oct 1, 2019
SIL290NL	290 W	39.60	9.54	32.40	8.97	≈17.1%	262 W	Oct 1, 2019
SIL295NL	295 W	40.00	9.61	32.70	9.04	≈17.4%	267 W	Oct 1, 2019
SIL300NL	300 W	39.85	9.71	32.80	9.16	≈17.6%	272 W	Oct 1, 2019
SIL305NL	305 W	40.05	9.82	32.92	9.27	≈17.9%	276 W	Oct 1, 2019
SIL-310NL	310 W	39.68	10.21	32.44	9.57	≥18.2%	286 W	Oct 1, 2019
SIL-315NL	315 W	39.88	10.26	32.65	9.66	≈18.5%	291 W	Oct 1, 2019
SIL-320NL	320 W	40.08	10.31	32.87	9.75	≈18.8%	296 W	Oct 1, 2019
SIL-325NL	325 W	40.27	10.36	33.09	9.84	≈19.1%	301 W	Jul 21, 2020
SIL-330NL	330 W	40.48	10.41	33.24	9.93	≈19.4%	305 W	Jul 21, 2020
SIL-335NL	335 W	40.68	10.46	33.46	10.02	≈19.7%	310 W	Jul 21, 2020
SIL-340NL	340 W	40.88	10.51	33.67	10.12	≈20.0%	315 W	Jul 21, 2020
SIL-345NL	345 W	41.08	10.57	33.84	10.21	≈20.3%	320 W	Jul 21, 2020

≈ efficiency = Pmax ÷ panel area 1.7 m² (datasheet size) for classes outside the datasheet.

Build & dimensions

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

Dimensions66.9 × 39.4 × 1.5 in1,700 × 1,000 × 38 mm
Module area1.7 m² (18.3 ft²)length × width
Weight41 lb (18.6 kg)
Cells60 cellsPERC
Back coverBlack backsheet
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	−0.36 %/°C	−0.366 %/°C
Voc coefficient β	−0.28 %/°C	−0.237 %/°C
Isc coefficient α	+0.06 %/°C	+0.010 %/°C
Vmp coefficient	≈ −0.42 %/°C	—
Operating cell temperature	NMOT 46 °C	NOCT 46.2 °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
310 W	222.0	36.00	8.00	29.60	7.50

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
285 W	200.9 W	29.24 V × 6.87 A	54.2 W	95%
290 W	204.7 W	29.6 V × 6.92 A	55.3 W	95%
295 W	208.2 W	29.88 V × 6.97 A	56.2 W	95%
300 W	211.7 W	29.97 V × 7.06 A	57.2 W	95%
305 W	215 W	30.08 V × 7.15 A	58.1 W	95%
310 W	213.2 W	29.27 V × 7.28 A	59.5 W	96%
315 W	216.6 W	29.46 V × 7.35 A	60.4 W	96%
320 W	220.1 W	29.66 V × 7.42 A	61.4 W	96%
325 W	223.6 W	29.85 V × 7.49 A	62.4 W	96%
330 W	226.7 W	29.99 V × 7.56 A	63.2 W	96%
335 W	230.3 W	30.19 V × 7.63 A	64.2 W	96%
340 W	233.9 W	30.38 V × 7.7 A	65.2 W	96%
345 W	237.2 W	30.53 V × 7.77 A	66.1 W	96%

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
Design load push / pull84 psf4,000 Pa

Packaging: 26 per pallet

Certifications

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

UL 61730UL 1703IEC 61215IEC 61730IEC 61701IEC 62716IEC 62804IEC 62790ISO 9001

UL 61730CEC listing
UL 1703datasheet
IEC 61215datasheet
IEC 61730datasheet
IEC 61701datasheet
IEC 62716datasheet
IEC 62804datasheet
IEC 62790datasheet
ISO 9001factory, datasheet

Warranty & degradation

Silfab Solar datasheet

Product warranty25 years
Performance warranty30 years
Year 30≥ 82.6%

Independent reliability testing

Kiwa PVEL Scorecard · RETC PV Module Index

PVEL Scorecards

Silfab Solar named Top Performer, 2017–2025

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

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

42.7 V

Voc when cold

per panel

26 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	3–14
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	4–14
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	9–11

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	42.7 / 26 V	⚠ Works; below MPPT at peak heat	1.1
Enphase IQ8X-80-M-US	320–540 W	79.5 V	43–60 V	42.7 / 26 V	✗ Not a match: module voltage below MPPT range	0.84
APsystems (Alt Power System) DS3-L	265–570 W	60 V	28–45 V	42.7 / 26 V	⚠ Works; below MPPT at peak heat	0.41
Enphase IQ8M-72-2-US	260–460 W	60 V	30–45 V	42.7 / 26 V	⚠ Works; below MPPT at peak heat	0.98
Enphase IQ8A-72-2-US	295–500 W	60 V	32–45 V	42.7 / 26 V	⚠ Works; below MPPT at peak heat	0.92

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	536	11,799	6.08
Palmdale	1,835	587	12,918	6.69
Chula Vista	1,696	543	11,940	6.11
Huntington Beach	1,643	526	11,567	5.89
Riverside	1,696	543	11,940	6.21
Santa Clarita	1,724	552	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.

Compare with similar 320 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)
Silfab Solar SIL-320NL	320 W	≈18.8%	−0.366	40.08	10.31	66.9 × 39.4 in	25 / 30 yr	brand 7×	2
JinkoSolar JKM320M-60HBL	320 W	≈19%	−0.407	40.9	10.15	66.3 × 39.4 in	10 / 25 yr	brand 12× (2014–2026)	45
LG Electronics LG320N1C-N5	320 W	≈18.5%	−0.342	40.8	10.53	66.9 × 40 in	25 / 25 yr	product 2021	5
REC Group REC320NP	320 W	≈19.8%	−0.351	40.8	10.18	—	—	brand 9× (2016–2025)	4

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-310 NL BAA JUST ARRA -IN-
Datasheet · Silfab Solar · Mar 2025
PDF
SIL-320 NL BAA JUST ARRA -IN-
Datasheet · Silfab Solar · Mar 2025
PDF
SIL-330 NL BAA JUST ARRA -IN-
Datasheet · Silfab Solar · Mar 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-xxxBG · 5

Questions & answers

How efficient is the Silfab Solar SIL-320NL?

Calculated from the panel area (1.7 m²): about 18.8% for the 320 W class. 320 W over 1.7 m² equals about 188 W per square meter.

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

PVWatts v8 with typical-year weather gives about 536 kWh per year per 320 W panel in Los Angeles and about 587 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 3–14 panels per string (Voc at 2 °C = 42.7 V, Vmp at 74 °C cell = 26 V). Final design must follow the inverter manual and NEC 690.7.

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?

66.9 × 39.4 × 1.5 in (1,700 × 1,000 × 38 mm), 41 lb (18.6 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

California Energy Commission — Solar Equipment Lists, PV Module List, Inverter List (snapshot Oct 7, 2026).
Silfab Solar — datasheet SIL-310 NL BAA JUST ARRA -IN-.
JinkoSolar — datasheet THE MOST DEPENDABLE SOLAR BRAND.
JinkoSolar — manufacturer datasheet “Eagle HC 60M G2 315-335 Watt MONO PERC HALF CELL MODULE”.
LG Electronics — datasheet Specification Sheet.
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 — Los Angeles County Public Works (EPIC-LA, unincorporated areas) (Jun 2020 – Aug 2024). Equipment matched from permit descriptions by model number.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).