Sale

Hoymiles HiFlow Pro LV 420W Plug-In WiFi Microinverter – HMS-420-1WM-LV

Hoymiles HiFlow Pro LV 420W Plug-In WiFi Microinverter – HMS-420-1WM-LV

Regular price $179.99 -15% $151.99
16% OFF
New
LESS THAN 50
Leave a Review

Hoymiles HiFlow Pro LV 420W Plug-In WiFi Microinverter – HMS-420-1WM-LV

Hoymiles HiFlow Pro LV 420W Plug-In WiFi Microinverter – HMS-420-1WM-LV

Available
MPN No: HMS-420-1WM-LV
Regular price $179.99 -15% $151.99

1
2
3
4
5
6

Shipping calculated at checkout. About shipping

delivery icon
Expected ship date Nov 10 - 17

Data Sheet: Hoymiles HMS-420-1WM-LV
Hoymiles Plug In Solar Installation Guide
Hoymiles User Manual

U.S. Warehouse

Trusted by Thousands

Expert U.S. Support

View full details
Regular price $179.99 -15% $151.99

Hoymiles HiFlow Pro LV Plug-In WiFi Microinverter

Plug-In Solar Microinverter | Built-In WiFi & Bluetooth | S-Miles Home App | Single-Panel Solar Conversion

The Hoymiles HiFlow Pro LV Plug-In WiFi Microinverter makes small-scale solar generation more accessible with a compact, single-panel inverter designed for residential plug-in solar applications. Part of the Hoymiles HiFlow Pro LV series, it converts electricity generated by a compatible solar panel into AC power for use in a suitable grid-connected electrical system.

Designed for balcony solar, patio installations, garden solar systems, and other compact residential applications, the HiFlow Pro LV combines efficient power conversion with convenient app-based monitoring and straightforward system configuration.

With integrated WiFi and Bluetooth, the microinverter connects directly to the S-Miles Home app without requiring a separate Hoymiles data transfer unit (DTU). Its advanced maximum power point tracking technology helps optimize energy production as sunlight and operating conditions change.

Key Features and Benefits

  • Plug-In Solar Design: Developed for compact residential solar applications, including balconies, patios, terraces, and gardens.
  • Single-Panel Microinverter: Connects to a compatible solar panel for individual module-level power conversion.
  • Built-In WiFi and Bluetooth: Enables local commissioning and wireless communication without an additional DTU.
  • S-Miles Home App: Provides convenient solar system monitoring and supported configuration features.
  • Advanced MPPT Technology: Continuously adjusts operating conditions to improve solar energy harvesting.
  • Plug-and-Play Cable Interface: Supports a compatible Hoymiles AC plug-in cable assembly.
  • Integrated Rapid Shutdown: Includes a manufacturer-described rapid shutdown function and galvanically isolated transformer design.
  • Outdoor-Rated Construction: Designed for exposed residential solar applications using a sealed enclosure.
  • Fanless Cooling: Uses natural convection for quiet operation without mechanical cooling fans.
  • Cybersecurity-Focused Design: Meets the ETSI EN 303 645 cybersecurity standard according to Hoymiles.

Designed for Residential Plug-In Solar

The Hoymiles HiFlow Pro LV is designed to simplify small residential solar installations. Its compact design makes it suitable for applications where a traditional rooftop string inverter system may be unnecessarily complex.

Homeowners can pair the microinverter with a compatible solar panel and the appropriate Hoymiles plug-in cable to create a small grid-connected solar generation system, subject to applicable electrical codes, utility requirements, and local plug-in solar regulations.

The microinverter synchronizes with the utility grid and is not designed to operate as a standalone off-grid inverter or provide backup power during an outage.

Monitor Solar Production with the S-Miles Home App

The HiFlow Pro LV includes integrated wireless communication, allowing users to commission and monitor their microinverter through the Hoymiles S-Miles Home app.

Bluetooth supports local device communication, while built-in WiFi enables supported remote monitoring features when connected to an appropriate network.

This integrated connectivity eliminates the need for a separate DTU for the microinverter's supported app functions.

Compatible Solar Panels

The HiFlow Pro LV is designed for use with a compatible single solar module. It supports modern residential photovoltaic panels, including suitable monocrystalline and bifacial modules, provided the panel's electrical characteristics remain within the microinverter's input limits.

Before selecting a solar panel, verify its open-circuit voltage, maximum power voltage, operating current, and short-circuit current against the inverter specifications. Cold-weather voltage conditions and potential bifacial current gains must also be considered.

A solar panel with a higher DC nameplate rating does not increase the inverter's maximum rated AC output. The inverter limits its AC production according to its operating capabilities.

Plug-In Cable and Connection Requirements

The HiFlow Pro LV uses the Hoymiles Flex-S3 field connector interface for its plug-and-play AC cable assembly. The North American datasheet specifies a Type B plug configuration.

Confirm the appropriate cable assembly and package contents before ordering. The manufacturer datasheet identifies the supported cable configuration but does not establish that the complete AC plug-in cable is included with every individually sold microinverter.

Use the manufacturer-approved cable and follow the applicable electrical installation requirements. Plug-in solar operation is subject to local regulations and utility interconnection rules.

Common Applications

  • Residential plug-in solar systems
  • Balcony and terrace solar installations
  • Patio and garden solar generation
  • Small grid-connected solar panel systems
  • Single-panel solar energy projects
  • Compact residential solar installations
  • Modular solar generation with compatible equipment

Product Specifications

Specification Details
Product Information
Brand Hoymiles
Series HiFlow Pro LV
Model / MPN HMS-420-1WM-LV
Product Type Single-input plug-in solar microinverter
Solar Input (DC)
Commonly Used PV Module Power 320–540+ W
Maximum DC Input Voltage 65V
MPPT Voltage Range 16–60V
Start-Up Voltage 22V
Maximum DC Input Current 14A
Maximum Input Short-Circuit Current 25A
Number of MPPT Trackers 1
PV Inputs per MPPT 1
AC Output
Rated AC Output Power 420VA
Rated AC Output Current 3.5A
Nominal AC Voltage 120V
AC Operating Voltage Range 90–150V
Nominal Frequency 60Hz
Frequency Range 55–65Hz, subject to local settings
Power Factor >0.99 default; adjustable from 0.8 leading to 0.8 lagging
Total Harmonic Distortion <3%
Plug-and-Play Cable Interface
AC Cable Connector Type Flex-S3 Field Connector
Specified Cable Gauge 14 AWG
Specified Plug-In Cable Length 15 ft / 4.57 m; customizable through distributor
AC Plug Type Type B
AC Cable Included Not established by the datasheet; verify package contents
Efficiency and Performance
Peak Efficiency 95.5%
Nominal MPPT Efficiency 99.8%
Night Power Consumption <50mW
Mechanical Specifications
Dimensions (W × H × D) 7.17 × 6.46 × 1.18 in / 182 × 164 × 30 mm
Weight 4.0 lb / 1.8 kg
Enclosure Rating NEMA 6 / IP67
Operating Temperature -40°F to +149°F / -40°C to +65°C
Cooling Natural convection; fanless
Communication and Compliance
Wireless Communication 2.4GHz WiFi + Bluetooth
Monitoring Interface LED indicator and S-Miles Home app
Inverter Topology Galvanically isolated high-frequency transformer
Manufacturer-Listed Compliance UL 1741, UL 3700, IEEE 1547
Cybersecurity Standard ETSI EN 303 645, per manufacturer
Datasheet Hoymiles HiFlow (360–500) Pro LV, North America, REV1.1, ©2026

Frequently Asked Questions

What is the Hoymiles HiFlow Pro LV microinverter?

It is a plug-in solar microinverter designed to convert electricity from a compatible solar panel into grid-synchronized AC power for small residential solar applications.

Can I use this microinverter with a bifacial solar panel?

Yes, provided the panel's voltage and current characteristics remain within the microinverter's specified limits, including potential additional current from rear-side solar generation.

Does the microinverter have built-in WiFi?

Yes. The HiFlow Pro LV includes built-in WiFi and Bluetooth for supported monitoring and commissioning functions through the S-Miles Home app.

Do I need a separate Hoymiles DTU?

No. Hoymiles specifies direct wireless communication through the S-Miles Home app without requiring an additional DTU.

Does the microinverter include the plug-in AC cable?

The manufacturer datasheet specifies the compatible plug-and-play cable connection but does not confirm that the complete cable is included with every microinverter. Check the selected product package before ordering.

Can the microinverter produce more electricity than its rated AC output?

No. A compatible solar panel may have a higher DC nameplate rating, but the microinverter limits AC production to its rated output capability under normal operating conditions.

Does the Hoymiles HiFlow Pro LV meet UL 3700?

Hoymiles lists UL 3700 among the compliance standards on its North American REV1.1 datasheet. Confirm the applicable certification listing and local regulatory requirements before making an installation or interconnection decision.

Will the microinverter work during a power outage?

No. This is a grid-connected microinverter, not a standalone backup power system. It is not designed to continue supplying household power when the utility grid is unavailable.

Can I connect a battery directly to this microinverter?

The manufacturer describes the HiFlow Pro LV as a photovoltaic microinverter, not a battery charger or hybrid inverter. Direct battery connection is not an identified supported application.

Is plug-in solar legal everywhere in the United States?

No. Plug-in solar rules and utility interconnection requirements vary by jurisdiction. Product compliance with an equipment standard does not automatically authorize plug-in operation in every state or utility territory.