Illustration

String inverterABB

ABB UNO-DM-3.8-TL-PLUS-US-SB-RA-Q

Name: ABB UNO-DM-3.8-TL-PLUS-US-SB-RA-Q
Brand: ABB

String inverter. 6 models, 3.3 kW–4.6 kW AC at 208 V / 240 V.

CEC listed · Aug 21, 2020Rapid shutdown

Model

Rated AC power3.8 kW
CEC weighted efficiency96.5%

Models & power ratings

CEC Grid Support Inverter List (Oct 7, 2026) · NLR SAM inverter library · 6 models

Model	Nominal AC	Grid voltage	CEC continuous	Rated AC (SAM)	CEC weighted eff.	DC test window	CEC listed	UL 1741 SB
UNO-DM-3.3-TL-PLUS-US-SB-RA-Q	3.3 kW	208 V	3 kW	3 kW	96.0%	200–480 V	Aug 21, 2020	—
UNO-DM-3.3-TL-PLUS-US-SB-RA-Q	3.3 kW	240 V	3.3 kW	3.3 kW	96.5%	200–480 V	Aug 21, 2020	—
UNO-DM-3.8-TL-PLUS-US-SB-RA-Q	3.8 kW	208 V	3.3 kW	3.3 kW	96.0%	200–480 V	Aug 21, 2020	—
UNO-DM-3.8-TL-PLUS-US-SB-RA-Q	3.8 kW	240 V	3.8 kW	3.8 kW	96.5%	200–480 V	Aug 21, 2020	—
UNO-DM-4.6-TL-PLUS-US-SB-RA-Q	4.6 kW	208 V	4.2 kW	4.2 kW	96.0%	200–480 V	Aug 21, 2020	—
UNO-DM-4.6-TL-PLUS-US-SB-RA-Q	4.6 kW	240 V	4.6 kW	4.6 kW	96.5%	200–480 V	Aug 21, 2020	—

DC input (PV side)

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

CEC test DC voltages (min / nom / max)200 / 355 / 480 V
DC input at rated output (CEC test)3.94 kW

Efficiency

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

CEC weighted efficiency96.5%
Night-time standby (tare)1 W
Power to start converting23.6 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 — TUV Rheinland of North America
Firmware tested (SA)1913B
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 (attested Aug 21, 2020)
CEC listedAug 21, 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)

Rapid shutdown (NEC 690.12)Yes (per CEC listing description)
Arc-fault protection (UL 1699B)Yes (per CEC listing description)

Monitoring & communication

CEC Grid Support Inverter List (Oct 7, 2026)

InterfacesWi-Fi (CEC listing description)

Panel compatibility & string sizing

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

CityColdest air, °CHottest cell, °C

UNO-DM-3.8-TL-PLUS-US-SB-RA-Q: 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 3.8 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
ABB UNO-DM-x.x-TL-PLUS-US-SB-RA-Q	3.3 kW–4.6 kW	96.5%	200–480 V	—	2020	0
Tesla 1534000-xx-y	3.34 kW–3.8 kW	97.5%	270–480 V	Yes	2021	4
GoodWe GEPx.x-1-US30	4.33 kW–11.4 kW	97.0%	143–500 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 ABB

CEC Grid Support Inverter List (Oct 7, 2026)

ManufacturerABB
Listed in CEC asABB
Models on CEC lists212

Other series

PVS-xx-TL-R-USPVS-xx-TL-S-R-USPVS-xx-TL-SC-R-USUNO-DM-5.0-TL-PLUS-US-SZ-RA-UUNO-DM-x.x-TL-PLUS-US-SB-RA-QU

Questions & answers

How efficient is the ABB UNO-DM-x.x-TL-PLUS-US-SB-RA-Q?

The California Energy Commission lists a weighted efficiency of 96.0–96.5% for ABB UNO-DM-x.x-TL-PLUS-US-SB-RA-Q models, measured at six power levels and three DC voltages.

What sizes does the ABB UNO-DM-x.x-TL-PLUS-US-SB-RA-Q come in?

The CEC list includes 6 models from 3.3 kW to 4.6 kW AC: UNO-DM-3.3-TL-PLUS-US-SB-RA-Q, UNO-DM-3.3-TL-PLUS-US-SB-RA-Q, UNO-DM-3.8-TL-PLUS-US-SB-RA-Q, UNO-DM-3.8-TL-PLUS-US-SB-RA-Q, UNO-DM-4.6-TL-PLUS-US-SB-RA-Q, UNO-DM-4.6-TL-PLUS-US-SB-RA-Q.

Is the ABB UNO-DM-x.x-TL-PLUS-US-SB-RA-Q certified to UL 1741 SB?

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

What is the UNO-DM-3.8-TL-PLUS-US-SB-RA-Q’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.
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).