Hoymiles HiFlow Pro LV 420W Plug-In WiFi Microinverter – HMS-420-1WM-LV
MPN No: HMS-420-1WM-LV
Expected ship date Nov 10 - 17
In Stock
179.99
-15%
$151.99
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HMS-420-1WM-LV
MPN No: HMS-420-1WM-LV
Expected ship date Nov 10 - 17
In Stock
179.99
-15%
$151.99
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.
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.
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.
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.
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.
| 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 |
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.
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.
Yes. The HiFlow Pro LV includes built-in WiFi and Bluetooth for supported monitoring and commissioning functions through the S-Miles Home app.
No. Hoymiles specifies direct wireless communication through the S-Miles Home app without requiring an additional DTU.
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.
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.
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.
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.
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.
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.