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MicroinverterHoymiles

Hoymiles HMS-391-1WM-LV

Microinverter. 3 models, 366 W–427 W AC at 120 V.

UL 1741 SBCEC listed · Aug 21, 2026
Model
  • Rated AC power398 W
  • CEC weighted efficiency95.5%

Models & power ratings

CEC Grid Support Inverter List (Oct 7, 2026) · 3 models
ModelNominal ACGrid voltageCEC continuousCEC weighted eff.DC test windowCEC listedUL 1741 SB
HMS-360-1WM-LV366 W120 V366 W95.5%28–48 VAug 21, 2026SB
HMS-391-1WM-LV398 W120 V398 W95.5%30–48 VAug 21, 2026SB
HMS-420-1WM-LV427 W120 V427 W95.5%32–48 VAug 21, 2026SB

DC input (PV side)

CEC Grid Support Inverter List (Oct 7, 2026)

Efficiency

CEC Grid Support Inverter List (Oct 7, 2026)
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 is required for new interconnections in California (Rule 21) since 2026.

Panel compatibility & string sizing

CEC Grid Support Inverter List (Oct 7, 2026) · NLR PVWatts v8 · CEC PV Module List · Cali-Graf calculation
HMS-391-1WM-LV: max DC 48 V · MPPT 30–48 V (CEC test window)

Most-permitted panels in Southern California

PanelPowerVoc cold / Vmp hotCheckDC/ACInstalled together
Qcells Q.PEAK DUO BLK ML-G10.C+ 410410 W48.1 / 30.6 V✗ Cold Voc above max input1.03—
Qcells Q.PEAK DUO BLK ML-G10+ 410410 W48.1 / 30.6 V✗ Cold Voc above max input1.03—
LONGi LR5-54HABB-400M400 W39.3 / 25.3 V⚠ Below MPPT at peak heat1.01—
JA Solar JAM54S31-405/MR405 W39.4 / 25.5 V⚠ Below MPPT at peak heat1.02—
Hyundai Solutions HiN-T440NF(BK)440 W40.9 / 27 V⚠ Below MPPT at peak heat1.11—
Silfab Solar SIL-440QD440 W41.1 / 28 V⚠ Below MPPT at peak heat1.11—
Qcells Q.TRON BLK M-G2+ 430430 W41.3 / 28 V⚠ Below MPPT at peak heat1.08—
Qcells Q.TRON BLK M-G2.H+ 430430 W41.3 / 28 V⚠ Below MPPT at peak heat1.08—
REC Group REC460AA Pure-RX460 W68.8 / 47.1 V✗ Cold Voc above max input1.16—
Elin (Sirius PV) ELNSM54M-HC-410410 W39.3 / 25.3 V⚠ Below MPPT at peak heat1.03—
Qcells Q.TRON BLK M-G2.C+ 430430 W41.3 / 28 V⚠ Below MPPT at peak heat1.08—
Tesla TSP-420420 W43.4 / 27.7 V⚠ Below MPPT at peak heat1.06—
Voltage check only, from CEC panel data and NLR weather for the city. Final design must follow the inverter manual and NEC 690.7.

About Hoymiles

CEC Grid Support Inverter List (Oct 7, 2026)

Other series

HM-xxxNT · 3 permitsMIS-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 HMS-xxx-1WM-LV?

The California Energy Commission lists a weighted efficiency of 95.5% for Hoymiles HMS-xxx-1WM-LV models, measured at six power levels and three DC voltages.

What sizes does the Hoymiles HMS-xxx-1WM-LV come in?

The CEC list includes 3 models from 366 W to 427 W AC: HMS-360-1WM-LV, HMS-391-1WM-LV, HMS-420-1WM-LV.

Is the Hoymiles HMS-xxx-1WM-LV certified to UL 1741 SB?

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

What is the HMS-391-1WM-LV’s DC input voltage range?

CEC tested it at 30–48 V DC.

Sources

  1. 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.
  2. NLR (formerly NREL) — PVWatts v8, NSRDB PSM v3 typical-year weather for Los Angeles, Palmdale, Riverside, Santa Clarita, Chula Vista, Huntington Beach.
  3. California Energy Commission — PV Module List (module electrical data for the compatibility check).
  4. Cali-Graf calculations — formulas and inputs are shown next to each calculated value (efficiency from area, temperature-corrected voltages, string sizing, energy estimates).