Hoymiles HiFlow 420 Pro LV Plug-in Microinverter | HMS-420-1WM-LV | UL3700
- Advanced MPPT algorithm supports multiple PV orientations
- Built-in Wi-Fi & Bluetooth module enables remote and local commissioning for different installation scenarios
- Plug-and-play design allows for fast and easy installation, reducing labor costs and installation time
- Works with the S-Miles Home app to customize your smart home solar system
- Meets ETSI EN 303 645 cybersecurity standards for enhanced privacy protection
- Integrated rapid shutdown and isolated transformer improve system safety and eliminate the risk of arc faults
See Specs ->
Hoymiles HiFlow Pro LV 1-in-1 series Microinverter
The HiFlow Pro LV 1-in-1 series microinverter is a plug-in inverter designed for residential installations such as balconies, terraces, and gardens. It features a plug-and-play design that eliminates complex wiring and simplifies installation. With a built-in Wi-Fi & Bluetooth module, it enables direct communication without the need for an additional DTU, allowing for fast and easy setup.
This microinverter delivers output power of up to 500 VA. Its advanced MPPT algorithm improves energy harvest and ensures stable performance under a wide range of conditions. Moreover, the new S-Miles Home App enhances functionality, enabling effortless customization of your smart home solar system.
Main Features:
- Advanced MPPT algorithm supports multiple PV orientations
- Built-in Wi-Fi & Bluetooth module enables remote and local commissioning for different installation scenarios
- Plug-and-play design allows for fast and easy installation, reducing labor costs and installation time
- Works with the S-Miles Home app to customize your smart home solar system
- Meets ETSI EN 303 645 cybersecurity standards for enhanced privacy protection
- Integrated rapid shutdown and isolated transformer improve system safety and eliminate the risk of arc faults
Input Data(DC):
- Module Power range, typical(W): 320 to 540+
- Maximum input voltage (V): 65
- MPPT voltage range (V): 16-60
- Maximum input current (A): 14
- Maximum input short circuit current (A): 25
- Number of MPPTs: 1
- Number of inputs per MPPT: 1
Output Data(AC):
- Peak output power (VA): 420
- Rated output current (A): 3.5
- Nominal output voltage/range (V): 120/90 to 150
- Nominal frequency/range (Hz): 60/55 to 65
Plug-and-Play Cable:
- Connector type: Flex-S3 Field Connector
- Cable size (AWG): 14
- Cable length (inches): 15 / 4.57 m (Customizable)
- Plug type : Type B
Efficiency:
- Peak efficiency: 95.50%
- Nominal MPPT efficiency: 99.80%
- Night power consumption (mW): < 50
Mechanical Data:
- Ambient temperature range (℉): -40 to +149 / -40℃ to +65℃
- Dimensions (W × H × D [inches]): 7.17 × 6.46 × 1.18 / 182 × 164 × 30 mm
- Weight (lb.) : 4.0 / 1.8 kg
- Enclosure rating: NEMA 6 / Outdoor - IP67
- Cooling: Natural convection – No fans
Features:
- Communication protocol: 2.4G Wi-Fi + Bluetooth
- Topology: Galvanically Isolated HF Transformer
- Interface : LED & S-Miles Home App
- Compliance: UL 1741, UL 3700, IEEE 1547
Download
Datasheet:
Hoymiles_Datasheet_HiFlow_360-500_Pro_LV_NA_EN.pdf
User Manual & Guide
Hoymiles_Quick_Installation_Guide_HiFlow_360-500.pdf
Certificate
UL3700-Certificate_for_HIFLOW-07.15.2026.pdf
Warranty
Hoymiles_Warranty-HiFlow-Pro-LV.pdf
About Hoymiles
Hoymiles is a global MLPE (Module Level Power Electronics) solution provider, specializing in module-level inverters and storage systems. With a vision of a clean, sustainable future, we strive to lead the smart energy industry through our rugged technology and reliable products.
With our driven engineer team, 1200+ global experts, and distribution & service network spanning North America, South America, Europe, Asia, Africa, and Oceania, Hoymiles has empowered homeowners and professionals in more than 100 countries and regions to join the journey to true open energy.
FAQ
The HMS-360-500-1WM-LV (HiFlow Pro LV) series consists of 1-in-1 low-voltage microinverters designed for small-scale residential solar applications, such as balcony PV systems, patio installations, and small rooftop or ground-mount arrays. Each unit connects directly to a single high-power solar module and converts DC power directly into grid-compliant AC power.
The LV stands for Low Voltage. Unlike standard residential microinverters that output 208V or 240V split-phase AC power, the LV series produces nominal 120V AC output (operating voltage range of 90 V to 150 V AC at 60 Hz). This allows direct connection into standard single-phase 120V household branch circuits or plug-in setups.
No. Unlike older Hoymiles microinverter lines that required a Sub-1G proprietary DTU stick for monitoring, the HMS-1WM-LV series features integrated 2.4 GHz Wi-Fi and Bluetooth directly inside the microinverter casing. You can commission and connect the unit directly to your home Wi-Fi network using a smartphone.
The microinverter is built for fast DIY or installer setup:
- - DC Side: Plug MC4 connectors from your solar panel into the microinverter's DC input ports.
- - AC Side: Uses a factory-provided Flex-S3 field connector with a standard outdoor-rated AC cable and plug (e.g., Type B 3-prong plug) for quick connection to a dedicated 120V outlet or AC junction box.
The HiFlow Pro LV series integrates a galvanically isolated high-frequency transformer, providing physical isolation between the DC PV circuit and the AC grid. It complies with North American grid safety and utility interconnect standards, including:
- - UL 1741 / UL 3700 safety standard
- - IEEE 1547 grid interconnection standards
- - Integrated Rapid Shutdown capability
- - ETSI EN 303 645 cybersecurity standard for IoT data privacy protection
The microinverter pairs with the Hoymiles S-Miles Home App (available on iOS and Android). Through the app, you can view real-time solar generation, review daily/historical yield, adjust system configurations, and receive over-the-air firmware updates via local Bluetooth or Wi-Fi.
A 1-in-1 microinverter design provides maximum flexibility because each solar panel operates independently. If one panel experiences shading, dirt, or reduced output, other panels continue producing normally. This design is especially beneficial for roofs with multiple orientations, complex layouts, or partial shading. It also simplifies system expansion because additional panels can be added individually without redesigning an entire string inverter system.
Yes. Multiple HMS-360-500-1WM-LV microinverters can be combined to create larger residential solar systems. Each microinverter operates independently while connecting to the same AC branch circuit according to electrical design requirements. This modular approach allows homeowners to expand their solar system gradually and provides easier troubleshooting because each panel-level device can be monitored separately.
Yes. The housing is rated NEMA 6 / IP67, making it fully dust-tight and capable of withstanding temporary water immersion.
- - Cooling: Natural convection (no internal fans to fail).
- - Operating Temperature Range:
-40°F to 149°F, -40°C to 65°C.
The Hoymiles HMS-360-500-1WM-LV combines flexible panel-level optimization, easy installation, smart monitoring, high efficiency, and durable outdoor performance. Its compact 1-in-1 design makes it suitable for modern residential solar projects where maximum energy harvest and installation flexibility are important. For homeowners seeking a reliable microinverter solution for rooftop, balcony, or small solar systems, the HMS-360-500-1WM-LV provides a practical and efficient option.
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