44.6″ · 1,133 mm wide · 1.38″ (35 mm) frame · 65 lb (29.5 kg)

Solar panelSilfab Solar

Silfab Solar SIL-630XL

Name: Silfab Solar SIL-630XL
Brand: Silfab Solar

60 half-cut cells, N-type, bifacial, high durability, superior hydrolysis and uv resistance, multi-layer dielectric film, transparent pv backsheet. Power classes 305–640 W in the CEC list; datasheet covers 620–640 W.

CEC listed · Jan 21, 2020UL 61730Bifacial · 80 ± 10%25-yr product + 30-yr performance warrantyN-type

Power class

Power (STC)630 WCEC nameplate
Efficiency≥22.6%datasheet minimum
%/°C Pmax−0.29CEC test: −0.331
Output at year 3089.3%performance warranty

Power classes

CEC PV Module List (Oct 7, 2026) · Cali-Graf calculation · Silfab Solar datasheet · 6 models

Model	Pmax	Voc, V	Isc, A	Vmp, V	Imp, A	Efficiency	PTC	CEC listed
SIL305XL	305 W	40.10	9.82	32.92	9.27	≈10.9%	280 W	Jan 21, 2020
SIL-620XL	620 W	57.21	13.55	48.16	12.87	≥22.2%	586 W	Sep 22, 2025
SIL-625XL	625 W	57.35	13.60	48.32	12.94	≈22.4%	590 W	Feb 11, 2026
SIL-630XL	630 W	57.49	13.66	48.47	13.00	≥22.6%	595 W	Sep 22, 2025
SIL-635XL	635 W	57.62	13.71	48.62	13.06	≈22.7%	600 W	Feb 11, 2026
SIL-640XL	640 W	57.76	13.76	48.78	13.12	≥22.9%	605 W	Sep 22, 2025

≈ efficiency = Pmax ÷ panel area 2.793 m² (datasheet size) for classes outside the datasheet.

Build & dimensions

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

Dimensions97 × 44.6 × 1.38 in2,465 × 1,133 × 35 mm
Module area2.79 m² (30.1 ft²)length × width
Weight65 lb (29.5 kg)
Cells60 half-cut cellsN-type
Back coverHigh durability, superior hydrolysis and UV resistance, multi-layer dielectric film, transparent PV backsheet
FrameAnodized Aluminum (Silver)
Junction boxIP68 rated, 3 diodes

Heat & cold behaviour

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

	Datasheet	CEC listing test
Pmax coefficient γ	−0.29 %/°C	−0.331 %/°C
Voc coefficient β	−0.24 %/°C	−0.271 %/°C
Isc coefficient α	+0.04 %/°C	—
Vmp coefficient	≈ −0.33 %/°C	—
Operating cell temperature	NMOT 45 °C	NOCT 43.1 °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
620 W	463.5	53.85	10.91	44.95	10.31
630 W	471.0	54.11	11.00	45.24	10.41
640 W	478.4	54.37	11.09	45.53	10.51

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
305 W	213.1 W	28.12 V × 7.58 A	58.6 W	96%
620 W	454.3 W	44.98 V × 10.1 A	120.3 W	97%
625 W	458.3 W	45.13 V × 10.15 A	121.3 W	97%
630 W	461.8 W	45.27 V × 10.2 A	122.3 W	97%
635 W	465.4 W	45.41 V × 10.25 A	123.2 W	97%
640 W	469.1 W	45.56 V × 10.3 A	124.2 W	97%

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 voltage1,500 V
Max series fuse30 A

Packaging: 31 per pallet

Bifacial performance

NLR SAM module library · Silfab Solar datasheet

BifacialYes
Bifaciality80 ± 10%
Back coverHigh durability, superior hydrolysis and UV resistance, multi-layer dielectric film, transparent PV backsheet

Power with rear gain (BSTC) — datasheet

Class	Pmax with rear gain
620 W	687 W
630 W	698 W
640 W	709.1 W

Rear gain depends on mounting height and ground reflectance; flush roof mounts receive little rear light.

Certifications

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

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

UL 61730CEC listing
IEC 61215datasheet
IEC 61730datasheet
IEC 61701datasheet
IEC 62716datasheet
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

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

60.7 V

Voc when cold

per panel

40.6 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	2–9
Solis (Ginlong) S6-EH1P10K-H-US	600 V	80–520 V	datasheet	2–9
Solis (Ginlong) Solis-1P7.6K-4G-US	600 V	100–500 V	datasheet	3–9
Qcells Q.VOLT H7.6SX	498 V	234–498 V	CEC test window	6–8

Microinverters (one per panel)

No microinverter in the reference set lists this power class in its recommended module power range.

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	1,056	11,615	6.08
Palmdale	1,835	1,156	12,717	6.69
Chula Vista	1,696	1,068	11,753	6.11
Huntington Beach	1,643	1,035	11,386	5.89
Riverside	1,696	1,068	11,753	6.21
Santa Clarita	1,724	1,086	11,947	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 630 W panels

CEC PV Module List (Oct 7, 2026) · Kiwa PVEL Scorecard · datasheets

Panel	Pmax	Efficiency	γ Pmax (CEC)	Voc, V	Isc, A	Warranty	PVEL (product / brand)
Silfab Solar SIL-630XL	630 W	≥22.6%	−0.331	57.49	13.66	25 / 30 yr	brand 7×
Canadian Solar CS7N-630MB-AG	630 W	≈20.5%	−0.390	44.2	18.23	—	product 2024
Hyundai Energy Solutions HiS-T630NJ	630 W	≈22.8%	−0.294	57.36	13.9	12 / 30 yr	brand 5× (2017–2025)
Waaree BiN-17-630	630 W	≥22.5%	−0.308	57.02	13.94	12 / 30 yr	product 2025, 2026

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
NTC SIL-620/630/640 XL BIFACIAL
Datasheet · Silfab Solar · May 2026
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-630XL?

The Silfab Solar datasheet guarantees at least 22.6% module efficiency for the 630 W class (up to 22.9% for 640 W). 630 W over 2.79 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 1,056 kWh per year per 630 W panel in Los Angeles and about 1,156 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 2–9 panels per string (Voc at 2 °C = 60.7 V, Vmp at 74 °C cell = 40.6 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 89.3% after 30 years (manufacturer datasheet).

How big and heavy is it?

97 × 44.6 × 1.38 in (2,465 × 1,133 × 35 mm), 65 lb (29.5 kg).

Is it bifacial?

Yes, bifaciality 80 ± 10%; with rear gain the 630 W class reaches 698 W per datasheet. Rear gain depends on mounting height and ground reflectance.

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 NTC SIL-620/630/640 XL BIFACIAL.
Hyundai Energy Solutions — datasheet [US] NJ(HiS) Series (N TOPCon Bifacial) 635~645W.
Waaree — datasheet ELITE SERIES BiN-17-615-645 WEL-EPD-615-645-156-BiN-HC-04-27.05.2024 35mm.
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 module and inverter libraries (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 — Solis (Ginlong), Tesla (manufacturer documents).
Building permits — Southern California permit portals. Equipment matched from permit descriptions.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).