7.2 × 6.5 × 1.2 in

MicroinverterHoymiles

Hoymiles HM-400NT

Name: Hoymiles HM-400NT
Brand: Hoymiles

Microinverter. 12 models, 295 W–1.44 kW AC at 208 V / 240 V.

UL 1741 SB · 11 of 12 modelsCEC listed · May 11, 2020Rapid shutdownInstalled in 3 SoCal permits

Model

Rated AC power382 W
CEC weighted efficiency96.5%
Max DC input60 V

Models & power ratings

CEC Grid Support Inverter List (Oct 7, 2026) · NLR SAM inverter library · building permits · 12 models

Model	Nominal AC	Grid voltage	CEC continuous	Rated AC (SAM)	CEC weighted eff.	DC test window	CEC listed	UL 1741 SB	In permits
HM-300NT	295 W	240 V	295 W	295 W	96.5%	29–48 V	Aug 3, 2020	SB	—
HM-350NT	349 W	240 V	349 W	349 W	96.5%	33–48 V	Aug 3, 2020	SB	—
HM-400NT	382 W	208 V	387 W	387 W	96.5%	38–48 V	Oct 2, 2023	SB	2
HM-400NT	382 W	240 V	383 W	383 W	96.5%	34–48 V	Aug 3, 2020	SB	2
HM-600NT	590 W	240 V	591 W	591 W	96.5%	29–48 V	May 11, 2020	SB	—
HM-700NT	696 W	240 V	697 W	697 W	96.5%	33–48 V	May 11, 2020	SB	—
HM-800NT	766 W	208 V	767 W	767 W	96.5%	34–48 V	Apr 21, 2023	SB	—
HM-800NT	766 W	240 V	767 W	767 W	96.5%	34–48 V	May 11, 2020	SB	—
HM-1000NT	1 kW	240 V	985 W	985 W	96.5%	32–48 V	Mar 1, 2021	—	—
HM-1200NT	1.2 kW	240 V	1.21 kW	1.21 kW	96.5%	32–48 V	May 11, 2020	SB	—
HM-1500NT	1.44 kW	208 V	1.44 kW	1.44 kW	96.5%	36–48 V	Aug 11, 2023	SB	1
HM-1500NT	1.44 kW	240 V	1.44 kW	1.44 kW	96.5%	36–48 V	May 11, 2020	SB	1

DC input (PV side)

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

Max DC input voltage60 V
MPPT operating range16–60 V
CEC test DC voltages (min / nom / max)34 / 42 / 48 V
Start-up voltage22 V
Strings per MPPT1
Max input current12.5 A
Max short-circuit current15 A
DC input at rated output (CEC test)396 W

AC output (grid side)

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

Rated AC power382 W
Max apparent power400 VA
CEC-measured continuous output383 W
Grid voltage208 V / 240 V
Phase208 V (1-phase of 3-phase service), split-phase 120/240 V
Frequency60 Hz
Max continuous output current1.84 A

Efficiency

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

CEC weighted efficiency96.5%
Peak efficiency96.7%
Night-time standby (tare)0.1 W
Power to start converting0.7 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.)11 of 12 models — CSA Group, certificate Jun 6, 2023
UL 1741 SA (SA8–SA13)9 of 12 models — CSA Group
Firmware tested (SA)V01.01.00
Volt-VAr with reactive power priority (SA13)9 of 12 models
Freq-Watt / Volt-Watt (SA14–15)9 of 12 models
Disable permit service / limit active power (SA17–18)9 of 12 models
CSIP (IEEE 2030.5) conformanceVia gateway during testing (Y*) (11 of 12 models)
Monitor key data & scheduling (Rule 21 Phase 3)Yes (attested Oct 2, 2023)
CEC listedMay 11, 2020
Last CEC updateJan 22, 2024
Standards listed on the datasheetUL 1741, UL 1741 SA, IEEE 1547, CSA C22.2, FCC Part 15, CA Rule 21, UL 1741 SB, UL 1741 CRD, UL 1699B, UL 1998, NEC 690.12 (rapid shutdown), UL 6703

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

Safety & protection

Hoymiles datasheets

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

Dimensions (W × H × D)7.2 × 6.5 × 1.2 in
Weight3.9 lb (1.8 kg)
Enclosure ratingNEMA 6, IP67, NEMA6, IP68, NEMA TYPE 6P, NEMA 6P, NEMA Type 4X, IP65
CoolingNatural convection (no fans)
Operating temperature−40 to +65 °C

Panel compatibility & string sizing

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

CityColdest air, °CHottest cell, °C

HM-400NT: max DC 60 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	1.07	—
Qcells Q.PEAK DUO BLK ML-G10+ 410	410 W	48.1 / 30.6 V	✓ Within range	1.07	—
LONGi LR5-54HABB-400M	400 W	39.3 / 25.3 V	✓ Within range	1.05	—
JA Solar JAM54S31-405/MR	405 W	39.4 / 25.5 V	✓ Within range	1.06	—
Hyundai Solutions HiN-T440NF(BK)	440 W	40.9 / 27 V	✓ Within range	1.15	—
Silfab Solar SIL-440QD	440 W	41.1 / 28 V	✓ Within range	1.15	—
Qcells Q.TRON BLK M-G2+ 430	430 W	41.3 / 28 V	✓ Within range	1.12	—
Qcells Q.TRON BLK M-G2.H+ 430	430 W	41.3 / 28 V	✓ Within range	1.12	—
REC Group REC460AA Pure-RX	460 W	68.8 / 47.1 V	✗ Cold Voc above max input	1.2	—
Elin (Sirius PV) ELNSM54M-HC-410	410 W	39.3 / 25.3 V	✓ Within range	1.07	—
Qcells Q.TRON BLK M-G2.C+ 430	430 W	41.3 / 28 V	✓ Within range	1.12	—
Tesla TSP-420	420 W	43.4 / 27.7 V	✓ Within range	1.1	—

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

Installed in Southern California

building permits

Permits name it

Sep 2024 – Jun 2026

Jurisdictions so far

LA County (unincorp.) (3)

Units listed

median 10 per permit

3.6 kW

Typical system

median of 3 permits

Permits over time

Model named in permit

HM-400NT

HM-1500NT

Only installer and ZIP level is shown — no homeowner names, street addresses or permit numbers. Permits from LA County (unincorp.) come without a contractor license, so they count toward totals but not toward installers. Counts grow as more permit portals are loaded.

Compare with similar 382 W 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 HM-xxxNT	295 W–1.44 kW	96.5%	34–48 V	Yes	2023	6
Enphase Energy IQ8 Series	240 W–633 W	97.5%	25–95 V	44 of 45	2025	1,104
Enphase Energy IQ7 Series	190 W–384 W	97.5%	22–64 V	114 of 119	2022	471
Enphase Energy IQ9 Series	405 W–440 W	97.5%	28–45 V	Yes	2026	—
MANGO POWER TECH LBZ-PV	400 W–500 W	97.0%	36–55 V	Yes	2026	—

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

HMS-xxx-1WM-LVMIS-xxx-1A-NAMIS-xxx-1NAMIS-xxx-2NAHMT-xxxx-4T-208-NAHM-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 HM-xxxNT?

The California Energy Commission lists a weighted efficiency of 96.5% for Hoymiles HM-xxxNT models, measured at six power levels and three DC voltages. The datasheet states a peak efficiency of 96.7%.

What sizes does the Hoymiles HM-xxxNT come in?

The CEC list includes 12 models from 295 W to 1.44 kW AC: HM-300NT, HM-350NT, HM-400NT, HM-400NT, HM-600NT, HM-700NT, HM-800NT, HM-800NT….

Is the Hoymiles HM-xxxNT certified to UL 1741 SB?

Yes — the CEC Grid Support Inverter List shows UL 1741 SB for 11 of 12 models.

What is the HM-400NT’s DC input voltage range?

Max DC input voltage is 60 V per the datasheet. MPPT operating range 16–60 V. CEC tested it at 34–48 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 “Open Energy For All Microinverter Description Datasheet Hoymiles 1-in-1 microinverter, which can be connected to one”.
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 — Los Angeles County Public Works (EPIC-LA, unincorporated areas) (Sep 2024 – Jun 2026). Equipment matched from permit descriptions by model number.
Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).