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MicroinverterHoymiles

Hoymiles HMT-1800-4T-208-NA

Microinverter. 3 models, 1.44 kW–1.92 kW AC at 208 V.

UL 1741 SBCEC listed · Feb 1, 2024Rapid shutdown

Model

Rated AC power1.73 kW
CEC weighted efficiency96.5%
Max DC input65 V

Models & power ratings

CEC Grid Support Inverter List (Oct 7, 2026) · NLR SAM inverter library · 3 models

Model	Nominal AC	Grid voltage	CEC continuous	Rated AC (SAM)	CEC weighted eff.	DC test window	CEC listed	UL 1741 SB
HMT-1600-4T-208-NA	1.44 kW	208 V	1.44 kW	1.44 kW	96.5%	28–48 V	Feb 1, 2024	SB
HMT-1800-4T-208-NA	1.73 kW	208 V	1.73 kW	1.73 kW	96.5%	31–48 V	Feb 1, 2024	SB
HMT-2000-4T-208-NA	1.92 kW	208 V	1.92 kW	1.92 kW	96.5%	32–48 V	Feb 1, 2024	SB

DC input (PV side)

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

Max DC input voltage65 V
MPPT operating range16–60 V
CEC test DC voltages (min / nom / max)31 / 40 / 48 V
Start-up voltage22 V
Strings per MPPT2
Max input current15 A
Max short-circuit current25 A
DC input at rated output (CEC test)1.8 kW

AC output (grid side)

Hoymiles datasheet · CEC Grid Support Inverter List (Oct 7, 2026)

Rated AC power1.73 kW
Max apparent power1,800 VA
CEC-measured continuous output1.73 kW
Grid voltage208 V
Phase208 V (1-phase of 3-phase service)
AC voltage range183–228 V
Frequency60 Hz
Max continuous output current4.8 A

Efficiency

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

CEC weighted efficiency96.5%
Peak efficiency96.5%
Night-time standby (tare)0.18 W
Power to start converting12.1 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) · Hoymiles datasheet

UL 1741 SB (3rd ed.)Yes — CSA Group, certificate Sep 11, 2023
UL 1741 SA (SA8–SA13)No
Volt-VAr with reactive power priority (SA13)No
Freq-Watt / Volt-Watt (SA14–15)No
Disable permit service / limit active power (SA17–18)No
CSIP (IEEE 2030.5) conformanceVia gateway during testing (Y*)
Monitor key data & scheduling (Rule 21 Phase 3)Yes (attested Feb 1, 2024)
CEC listedFeb 1, 2024
Standards listed on the datasheetUL 1741, UL 1741 SA, UL 1741 SB, UL 1741 CRD, IEEE 1547, UL 1699B, UL 1998, CSA C22.2, FCC Part 15, CA Rule 21, NEC 690.12 (rapid shutdown), UL 6703

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

Safety & protection

Hoymiles datasheet

Rapid shutdown (NEC 690.12)Yes (NEC 690.12, datasheet)
Arc-fault protection (UL 1699B)Yes — UL 1699B

Monitoring & communication

Hoymiles datasheet

InterfacesWi-Fi, Ethernet, PLC, RS485, Cellular, Modbus, SunSpec, CAN

Size, weight & environment

Hoymiles datasheet

Enclosure ratingNEMA 6, IP67, NEMA6, IP68, NEMA TYPE 6P, NEMA 6P, NEMA Type 4X, IP65
CoolingNatural convection (no fans)

Panel compatibility & string sizing

Hoymiles datasheet · NLR PVWatts v8 · CEC PV Module List · Cali-Graf calculation

CityColdest air, °CHottest cell, °C

HMT-1800-4T-208-NA: max DC 65 V · MPPT 16–60 V (datasheet)

Most-permitted panels in Southern California

Panel	Power	Voc cold / Vmp hot	Check	DC/AC	Installed together
Qcells Q.PEAK DUO BLK ML-G10.C+ 410	410 W	48.1 / 30.6 V	✓ Within range	0.24	—
Qcells Q.PEAK DUO BLK ML-G10+ 410	410 W	48.1 / 30.6 V	✓ Within range	0.24	—
LONGi LR5-54HABB-400M	400 W	39.3 / 25.3 V	✓ Within range	0.23	—
JA Solar JAM54S31-405/MR	405 W	39.4 / 25.5 V	✓ Within range	0.23	—
Hyundai Solutions HiN-T440NF(BK)	440 W	40.9 / 27 V	✓ Within range	0.25	—
Silfab Solar SIL-440QD	440 W	41.1 / 28 V	✓ Within range	0.25	—
Qcells Q.TRON BLK M-G2+ 430	430 W	41.3 / 28 V	✓ Within range	0.25	—
Qcells Q.TRON BLK M-G2.H+ 430	430 W	41.3 / 28 V	✓ Within range	0.25	—
REC Group REC460AA Pure-RX	460 W	68.8 / 47.1 V	✗ Cold Voc above max input	0.27	—
Elin (Sirius PV) ELNSM54M-HC-410	410 W	39.3 / 25.3 V	✓ Within range	0.24	—
Qcells Q.TRON BLK M-G2.C+ 430	430 W	41.3 / 28 V	✓ Within range	0.25	—
Tesla TSP-420	420 W	43.4 / 27.7 V	✓ Within range	0.24	—

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 1.73 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
Hoymiles HMT-xxxx-4T-208-NA	1.44 kW–1.92 kW	96.5%	31–48 V	Yes	2024	0
Hoymiles HM-xxxNT	295 W–1.44 kW	96.5%	29–48 V	11 of 12	2023	3
Northern Electric & Power BDHX-xxxxT-208	2.08 kW–2.08 kW	95.5%	22–55 V	Yes	2026	—
APsystems (Altenergy Power System) QSxxxx	1.2 kW–1.92 kW	96.5%	27–48 V	2 of 3	2025	—
Sol-Ark SA-MP-1000-208/240V	1 kW–1,000 kW	96.0%	40–55 V	Yes	2025	—

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

About Hoymiles

CEC Grid Support Inverter List (Oct 7, 2026)

ManufacturerHoymiles
Listed in CEC asHoymiles Power Electronics Inc.
Websitehoymiles.com
Models on CEC lists402

Other series

HM-xxxNT · 3 permitsHMS-xxx-1WM-LVMIS-xxx-1A-NAMIS-xxx-1NAMIS-xxx-2NAHM-xxxNHMS-xxx-1A-NAHMS-xxx-1T-NAHMS-xxx-2T-NAHMS-xxxx-4T-NAHMS-xxx-1D-NAHMS-xxx-2D-NA

Questions & answers

How efficient is the Hoymiles HMT-xxxx-4T-208-NA?

The California Energy Commission lists a weighted efficiency of 96.5% for Hoymiles HMT-xxxx-4T-208-NA models, measured at six power levels and three DC voltages. The datasheet states a peak efficiency of 96.5%.

What sizes does the Hoymiles HMT-xxxx-4T-208-NA come in?

The CEC list includes 3 models from 1.44 kW to 1.92 kW AC: HMT-1600-4T-208-NA, HMT-1800-4T-208-NA, HMT-2000-4T-208-NA.

Is the Hoymiles HMT-xxxx-4T-208-NA certified to UL 1741 SB?

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

What is the HMT-1800-4T-208-NA’s DC input voltage range?

Max DC input voltage is 65 V per the datasheet. MPPT operating range 16–60 V. CEC tested it at 31–48 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.
Hoymiles — manufacturer datasheet “PRODUCT BROCHURE 2023 FOR NORTH AMERICA”.
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).