Illustration

Hybrid inverterFronius

Fronius Primo GEN24 6.0 208-240 Plus

Name: Fronius Primo GEN24 6.0 208-240 Plus
Brand: Fronius

Hybrid inverter, dc-coupled hybrid (pv + battery). 10 models, 3.8 kW–10 kW AC at 208 V / 240 V.

UL 1741 SBCEC listed · Nov 12, 2021

Model

Rated AC power6 kW
CEC weighted efficiency97.0%

Models & power ratings

CEC Grid Support Inverter List (Oct 7, 2026) · NLR SAM inverter library · 10 models

Model	Nominal AC	Grid voltage	CEC continuous	Rated AC (SAM)	CEC weighted eff.	DC test window	CEC listed	UL 1741 SB
Primo GEN24 3.8 208-240 Plus	3.8 kW	208 V	3.81 kW	3.81 kW	96.5%	200–480 V	Nov 12, 2021	SB
Primo GEN24 3.8 208-240 Plus	3.8 kW	240 V	3.8 kW	3.8 kW	96.5%	200–480 V	Nov 12, 2021	SB
Primo GEN24 5.0 208-240 Plus	5 kW	208 V	5.01 kW	5.01 kW	97.0%	230–480 V	Nov 12, 2021	SB
Primo GEN24 5.0 208-240 Plus	5 kW	240 V	5.01 kW	5.01 kW	97.0%	230–480 V	Nov 12, 2021	SB
Primo GEN24 6.0 208-240 Plus	6 kW	208 V	5.74 kW	5.74 kW	97.0%	230–480 V	Nov 12, 2021	SB
Primo GEN24 6.0 208-240 Plus	6 kW	240 V	6 kW	6 kW	97.0%	230–480 V	Nov 12, 2021	SB
Primo GEN24 7.7 208-240 Plus	7.7 kW	208 V	7.69 kW	7.69 kW	96.5%	260–480 V	Sep 3, 2024	SB
Primo GEN24 7.7 208-240 Plus	7.7 kW	240 V	7.69 kW	7.69 kW	97.0%	260–480 V	Sep 3, 2024	SB
Primo GEN24 10.0 208-240 Plus	10 kW	208 V	9.45 kW	9.45 kW	96.5%	260–480 V	Sep 3, 2024	SB
Primo GEN24 10.0 208-240 Plus	10 kW	240 V	10 kW	10 kW	97.0%	260–480 V	Sep 3, 2024	SB

Some models are also on the CEC Battery Inverter list — one product, two listings.

DC input (PV side)

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

CEC test DC voltages (min / nom / max)230 / 400 / 480 V
DC input at rated output (CEC test)6.17 kW

Efficiency

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

CEC weighted efficiency97.0%
Night-time standby (tare)8.3 W
Power to start converting26.2 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.)Yes — CSA Group, certificate Apr 9, 2025
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)Yes
CSIP (IEEE 2030.5) conformanceVia gateway during testing (Y*)
Monitor key data & scheduling (Rule 21 Phase 3)Yes
Power control system (PCS)Stated in CEC listing (power control system)
Built-in meterYes
CEC listedNov 12, 2021
Last CEC updateMay 1, 2025

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

Primo GEN24 6.0 208-240 Plus: max DC 480 V · MPPT 230–480 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	8–9	—
Qcells Q.PEAK DUO BLK ML-G10+ 410	410 W	48.1 V	30.6 V	8–9	—
LONGi LR5-54HABB-400M	400 W	39.3 V	25.3 V	10–12	—
JA Solar JAM54S31-405/MR	405 W	39.4 V	25.5 V	10–12	—
Hyundai Solutions HiN-T440NF(BK)	440 W	40.9 V	27 V	9–11	—
Silfab Solar SIL-440QD	440 W	41.1 V	28 V	9–11	—
Qcells Q.TRON BLK M-G2+ 430	430 W	41.3 V	28 V	9–11	—
Qcells Q.TRON BLK M-G2.H+ 430	430 W	41.3 V	28 V	9–11	—
REC Group REC460AA Pure-RX	460 W	68.8 V	47.1 V	5–6	—
Elin (Sirius PV) ELNSM54M-HC-410	410 W	39.3 V	25.3 V	10–12	—
Qcells Q.TRON BLK M-G2.C+ 430	430 W	41.3 V	28 V	9–11	—
Tesla TSP-420	420 W	43.4 V	27.7 V	9–11	—

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 6 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 Primo GEN24 x.x 208-240 Plus	3.8 kW–10 kW	97.0%	230–480 V	Yes	2024	0
SolarEdge SExxxxH-US	3 kW–11.4 kW	99.0%	360–480 V	Yes	2025	1,046
Delta Electronics Ex-TL-US	3.33 kW–9.6 kW	97.5%	200–480 V	Yes	2022	28
Qcells Q.VOLT Hx.xSX	3.8 kW–7.6 kW	97.5%	175–500 V	Yes	2023	25
SolarEdge SExxxxxA-US	3.8 kW–11.4 kW	98.0%	320–500 V	No	2024	18

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

Approved in other markets

Clean Energy Council (Australia)

Model	Approved	Expires	Standards
Primo GEN24 10.0	Aug 14, 2026	Aug 14, 2029	IEC 62109-1;IEC 62109-2;AS/NZS 4777.2:2020 Amd 2:2024
Primo GEN24 10.0 Plus	Aug 14, 2026	Aug 14, 2029	IEC 62109-1;IEC 62109-2;AS/NZS 4777.2:2020 Amd 2:2024
Primo GEN24 3.0	Jan 7, 2025	Jan 3, 2027	IEC 62109.1;IEC 62109.2;AS/NZS 4777.2:2020
Primo GEN24 3.0 Plus	Jan 7, 2025	Jan 3, 2027	IEC 62109.1;IEC 62109.2;AS/NZS 4777.2:2020
Primo GEN24 3.0 Plus SC	Jul 30, 2026	Jul 30, 2029	IEC 62109-1;IEC 62109-2;AS/NZS 4777.2:2020 Amd 2:2024
Primo GEN24 3.0 SC	Jul 30, 2026	Jul 30, 2029	IEC 62109-1;IEC 62109-2;AS/NZS 4777.2:2020 Amd 2:2024
Primo GEN24 3.6	Jan 7, 2025	Jan 3, 2027	IEC 62109.1;IEC 62109.2;AS/NZS 4777.2:2020
Primo GEN24 3.6 Plus	Jan 7, 2025	Jan 3, 2027	IEC 62109.1;IEC 62109.2;AS/NZS 4777.2:2020
Primo GEN24 3.6 Plus SC	Jul 30, 2026	Jul 30, 2029	IEC 62109-1;IEC 62109-2;AS/NZS 4777.2:2020 Amd 2:2024
Primo GEN24 3.6 SC	Jul 30, 2026	Jul 30, 2029	IEC 62109-1;IEC 62109-2;AS/NZS 4777.2:2020 Amd 2:2024
Primo GEN24 4.0	Jan 7, 2025	Jan 3, 2027	IEC 62109.1;IEC 62109.2;AS/NZS 4777.2:2020
Primo GEN24 4.0 Plus	Jan 7, 2025	Jan 3, 2027	IEC 62109.1;IEC 62109.2;AS/NZS 4777.2:2020

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

Primo GEN24 x.x 208-240

Questions & answers

How efficient is the Fronius Primo GEN24 x.x 208-240 Plus?

The California Energy Commission lists a weighted efficiency of 96.5–97.0% for Fronius Primo GEN24 x.x 208-240 Plus models, measured at six power levels and three DC voltages.

What sizes does the Fronius Primo GEN24 x.x 208-240 Plus come in?

The CEC list includes 10 models from 3.8 kW to 10 kW AC: Primo GEN24 3.8 208-240 Plus, Primo GEN24 3.8 208-240 Plus, Primo GEN24 5.0 208-240 Plus, Primo GEN24 5.0 208-240 Plus, Primo GEN24 6.0 208-240 Plus, Primo GEN24 6.0 208-240 Plus, Primo GEN24 7.7 208-240 Plus, Primo GEN24 7.7 208-240 Plus….

Is the Fronius Primo GEN24 x.x 208-240 Plus certified to UL 1741 SB?

Yes — the CEC Grid Support Inverter List shows UL 1741 SB for all models.

Can the Fronius Primo GEN24 x.x 208-240 Plus be used with a battery?

The CEC lists it as a dc-coupled hybrid (pv + battery).

What is the Primo GEN24 6.0 208-240 Plus’s DC input voltage range?

CEC tested it at 230–480 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.
NLR (formerly NREL) — System Advisor Model CEC inverter library (version 2026.7.3).
Clean Energy Council (Australia) — approved inverter list (as of Oct 8, 2026).
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).