Illustration

String inverterFronius

Fronius Fronius Symo Advanced 12.0-3 208-240 Lite

Name: Fronius Fronius Symo Advanced 12.0-3 208-240 Lite
Brand: Fronius

String inverter. 4 models, 10 kW–12 kW AC at 208 V / 240 V.

CEC listed · May 11, 2020

Model

Rated AC power12 kW
CEC weighted efficiency96.5%

Models & power ratings

CEC Grid Support Inverter List (Oct 7, 2026) · NLR SAM inverter library · 4 models

Model	Nominal AC	Grid voltage	CEC continuous	Rated AC (SAM)	CEC weighted eff.	DC test window	CEC listed	UL 1741 SB
Fronius Symo Advanced 10.0-3 208-240 Lite	10 kW	208 V	10 kW	10 kW	96.5%	300–480 V	May 11, 2020	—
Fronius Symo Advanced 10.0-3 208-240 Lite	10 kW	240 V	10.1 kW	10.1 kW	96.5%	300–480 V	May 11, 2020	—
Fronius Symo Advanced 12.0-3 208-240 Lite	12 kW	208 V	12.3 kW	12.3 kW	96.5%	300–480 V	May 11, 2020	—
Fronius Symo Advanced 12.0-3 208-240 Lite	12 kW	240 V	12.1 kW	12.1 kW	96.5%	300–480 V	May 11, 2020	—

DC input (PV side)

CEC Grid Support Inverter List (Oct 7, 2026) · NLR SAM inverter library

CEC test DC voltages (min / nom / max)300 / 370 / 480 V
DC input at rated output (CEC test)12.5 kW

Efficiency

CEC Grid Support Inverter List (Oct 7, 2026) · NLR SAM inverter library

CEC weighted efficiency96.5%
Night-time standby (tare)0.8 W
Power to start converting32.2 W

CEC weighted efficiency is measured by an accredited lab at six power levels and three DC voltages — the number to compare between inverters.

Grid & smart-inverter certification

CEC Grid Support Inverter List (Oct 7, 2026)

UL 1741 SB (3rd ed.)No
UL 1741 SA (SA8–SA13)Yes — CSA Group
Volt-VAr with reactive power priority (SA13)Yes
Freq-Watt / Volt-Watt (SA14–15)Yes
Disable permit service / limit active power (SA17–18)No
CSIP (IEEE 2030.5) conformanceNo
Monitor key data & scheduling (Rule 21 Phase 3)No
Built-in meterYes
CEC listedMay 11, 2020

UL 1741 SB is required for new interconnections in California (Rule 21) since 2026.

Safety & protection

CEC Grid Support Inverter List (Oct 7, 2026)

Arc-fault protection (UL 1699B)Yes (per CEC listing description)

Monitoring & communication

CEC Grid Support Inverter List (Oct 7, 2026)

Built-in production meterBuilt-in meter (CEC listing)

Panel compatibility & string sizing

NLR SAM inverter library · NLR PVWatts v8 · CEC PV Module List · Cali-Graf calculation

CityColdest air, °CHottest cell, °C

Fronius Symo Advanced 12.0-3 208-240 Lite: max DC 480 V · MPPT 300–480 V (CEC test window)

Most-permitted panels in Southern California

Panel	Power	Voc cold	Vmp hot	Panels per string	Installed together
Qcells Q.PEAK DUO BLK ML-G10.C+ 410	410 W	48.1 V	30.6 V	no fit	—
Qcells Q.PEAK DUO BLK ML-G10+ 410	410 W	48.1 V	30.6 V	no fit	—
LONGi LR5-54HABB-400M	400 W	39.3 V	25.3 V	12–12	—
JA Solar JAM54S31-405/MR	405 W	39.4 V	25.5 V	12–12	—
Hyundai Solutions HiN-T440NF(BK)	440 W	40.9 V	27 V	no fit	—
Silfab Solar SIL-440QD	440 W	41.1 V	28 V	11–11	—
Qcells Q.TRON BLK M-G2+ 430	430 W	41.3 V	28 V	11–11	—
Qcells Q.TRON BLK M-G2.H+ 430	430 W	41.3 V	28 V	11–11	—
REC Group REC460AA Pure-RX	460 W	68.8 V	47.1 V	no fit	—
Elin (Sirius PV) ELNSM54M-HC-410	410 W	39.3 V	25.3 V	12–12	—
Qcells Q.TRON BLK M-G2.C+ 430	430 W	41.3 V	28 V	11–11	—
Tesla TSP-420	420 W	43.4 V	27.7 V	11–11	—

Voltage check only, from CEC panel data and NLR weather for the city. Final design must follow the inverter manual and NEC 690.7.

Compare with similar 12 kW inverters

CEC Grid Support Inverter List (Oct 7, 2026) · building permits

Inverter	Power	CEC weighted eff.	DC test window	UL 1741 SB	Latest CEC	SoCal permits
Fronius Fronius Symo Advanced xx.x-3 208-240 Lite	10 kW–12 kW	96.5%	300–480 V	—	2020	0
GoodWe GEPx.x-1-US30	4.33 kW–11.4 kW	97.0%	143–500 V	Yes	2022	—
GoodWe GW11K4-MS-US30	9.88 kW–11.4 kW	97.0%	217–500 V	Yes	2022	—
GoodWe GWxxxx-MS-US30	4.33 kW–9.6 kW	97.0%	143–500 V	Yes	2022	—
GoodWe GWxxxxA-MS	5 kW–9.6 kW	97.5%	210–480 V	Yes	2021	—

Same type and grid voltage, power range covering this model; same fields from the same sources.

About Fronius

CEC Grid Support Inverter List (Oct 7, 2026)

ManufacturerFronius
Listed in CEC asFronius International GmbH
Websitefronius.com
Models on CEC lists279

Other series

Fronius Symo Advanced xx.x-3 480 Lite

Documents

manufacturer documents

PDF
SE DS Fronius SmartMeter EN
Datasheet · Fronius
PDF
SE DS Fronius Symo EN US
Datasheet · Fronius
PDF
SE DS Fronius Symo EN
Datasheet · Fronius

Questions & answers

How efficient is the Fronius Fronius Symo Advanced xx.x-3 208-240 Lite?

The California Energy Commission lists a weighted efficiency of 96.5% for Fronius Fronius Symo Advanced xx.x-3 208-240 Lite models, measured at six power levels and three DC voltages.

What sizes does the Fronius Fronius Symo Advanced xx.x-3 208-240 Lite come in?

The CEC list includes 4 models from 10 kW to 12 kW AC: Fronius Symo Advanced 10.0-3 208-240 Lite, Fronius Symo Advanced 10.0-3 208-240 Lite, Fronius Symo Advanced 12.0-3 208-240 Lite, Fronius Symo Advanced 12.0-3 208-240 Lite.

Is the Fronius Fronius Symo Advanced xx.x-3 208-240 Lite certified to UL 1741 SB?

The CEC list does not show UL 1741 SB certification for these models.

What is the Fronius Symo Advanced 12.0-3 208-240 Lite’s DC input voltage range?

CEC tested it at 300–480 V DC.

Sources

California Energy Commission — Grid Support Inverter List (solar and battery inverters), data as of Oct 7, 2026. Manufacturer-reported, confirmed by CEC against certificates and test reports.
Fronius — document library on the manufacturer’s website (links above).
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, Riverside, Santa Clarita, Chula Vista, Huntington Beach.
California Energy Commission — PV Module List (module electrical data for the compatibility check).
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).