Illustration

Hybrid inverterFortress Power

Fortress Power EdgeOn Duo 7.5

Name: Fortress Power EdgeOn Duo 7.5
Brand: Fortress Power

Hybrid inverter, dc-coupled hybrid (pv + battery). 2 models, 5 kW AC at 208 V / 240 V.

UL 1741 SBCEC listed · Aug 11, 2026

Model

Rated AC power5 kW
CEC weighted efficiency96.5%

Models & power ratings

CEC Grid Support Inverter List (Oct 7, 2026) · 2 models

Model	Nominal AC	Grid voltage	CEC continuous	CEC weighted eff.	DC test window	CEC listed	UL 1741 SB
EdgeOn Duo 7.5	5 kW	208 V	5.02 kW	96.5%	200–480 V	Aug 11, 2026	SB
EdgeOn Duo 7.5	5 kW	240 V	5.04 kW	96.5%	200–480 V	Aug 11, 2026	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)

CEC test DC voltages (min / nom / max)200 / 360 / 480 V

Efficiency

CEC Grid Support Inverter List (Oct 7, 2026)

CEC weighted efficiency96.5%
Night-time standby (tare)15 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 — SGS, certificate Dec 8, 2025
UL 1741 SA (SA8–SA13)Yes — SGS
Firmware tested (SA)51001
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*)
Anti-islanding method groupsGroups 1, 2a, 2b, 2c, 3, 4, 5, 6 (manufacturer-reported)
Power control system (PCS)Stated in CEC listing (power control system)
Built-in meterYes
CEC listedAug 11, 2026

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

Monitoring & communication

CEC Grid Support Inverter List (Oct 7, 2026)

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

Panel compatibility & string sizing

CEC Grid Support Inverter List (Oct 7, 2026) · NLR PVWatts v8 · CEC PV Module List · Cali-Graf calculation

CityColdest air, °CHottest cell, °C

EdgeOn Duo 7.5: max DC 480 V · MPPT 200–480 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	7–9	—
Qcells Q.PEAK DUO BLK ML-G10+ 410	410 W	48.1 V	30.6 V	7–9	—
LONGi LR5-54HABB-400M	400 W	39.3 V	25.3 V	8–12	—
JA Solar JAM54S31-405/MR	405 W	39.4 V	25.5 V	8–12	—
Hyundai Solutions HiN-T440NF(BK)	440 W	40.9 V	27 V	8–11	—
Silfab Solar SIL-440QD	440 W	41.1 V	28 V	8–11	—
Qcells Q.TRON BLK M-G2+ 430	430 W	41.3 V	28 V	8–11	—
Qcells Q.TRON BLK M-G2.H+ 430	430 W	41.3 V	28 V	8–11	—
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	8–12	—
Qcells Q.TRON BLK M-G2.C+ 430	430 W	41.3 V	28 V	8–11	—
Tesla TSP-420	420 W	43.4 V	27.7 V	8–11	—

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 5 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
Fortress Power EdgeOn Duo 7.5	5 kW–5 kW	96.5%	200–480 V	Yes	2026	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.

About Fortress Power

CEC Grid Support Inverter List (Oct 7, 2026)

ManufacturerFortress Power
Listed in CEC asFortress Power LLC
Websitefortresspower.com
Models on CEC lists554

Other series

EdgeOn Duo 12EdgeOn Duo 12 LiteEdgeOn Duo 15EdgeOn Duo 15 LiteEdgeOn Duo 15 ProEdgeOn Duo 9FP-Nano-30k-LFP-Nano-xxk-NFP-ENVY-xxKFP-Envy Duo 21

Documents

manufacturer documents

PDF
Fortress Power EdgeOn Duo 9 | Data Sheet (English)
Datasheet · Fortress Power · Oct 2026
PDF
Fortress Power EdgeOn Duo 15 | Data Sheet (English)
Datasheet · Fortress Power · Oct 2026
PDF
FP-datasheet-EdgeOnDuo15 0126
Datasheet · Fortress Power · Jan 2026
PDF
FP-datasheet-EdgeOnDuo9 0126
Datasheet · Fortress Power · Jan 2026

Questions & answers

How efficient is the Fortress Power EdgeOn Duo 7.5?

The California Energy Commission lists a weighted efficiency of 96.5% for Fortress Power EdgeOn Duo 7.5 models, measured at six power levels and three DC voltages.

What sizes does the Fortress Power EdgeOn Duo 7.5 come in?

The CEC list includes 2 models from 5 kW to 5 kW AC: EdgeOn Duo 7.5, EdgeOn Duo 7.5.

Is the Fortress Power EdgeOn Duo 7.5 certified to UL 1741 SB?

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

Can the Fortress Power EdgeOn Duo 7.5 be used with a battery?

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

What is the EdgeOn Duo 7.5’s DC input voltage range?

CEC tested it at 200–480 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.
Fortress Power — document library on the manufacturer’s website (links above).
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).