Modular | Smart | Digital Energy Meter for Solar Power Systems | with Voltage | Current | Leakage | Phase Loss Protection Functions | Bidirectional | 3-Phase | 1-100A | 230VAC / 380-415VAC | DIN Rail | Wi-Fi | TUYA

Smart three-phase bidirectional energy meter – 3P+N, 1-100A, Wi-Fi, Tuya, for PV systems, DIN

Smart three-phase bidirectional energy meter designed for real-time monitoring of energy flows in three-phase 3P+N electrical networks, solar power systems, commercial facilities and industrial electrical systems.

The device measures energy consumed from the grid and energy exported to the grid, monitors the main three-phase network parameters, displays information on an LCD screen and transmits data via 2.4GHz Wi-Fi to the Tuya Smart or Smart Life app.

• Voltage – for monitoring the voltage condition of the three-phase electrical network.
• Current – for analysing phase load and current changes.
• Active power – for evaluating actual electrical power consumption.
• Reactive power – for analysing inductive and capacitive loads.
• Power factor – for evaluating the PF value and electrical system efficiency.
• Frequency – for monitoring the mains frequency in Hz.
• Electrical energy – for measuring kWh consumption and generation.
• Energy flow direction – for distinguishing imported and exported energy.

• Bidirectional energy metering – for monitoring energy drawn from and exported to the grid.
• 3P+N network monitoring – for three-phase four-wire electrical systems.
• Real-time voltage and current display – for evaluating grid and load condition.
• Active and reactive power analysis – for more detailed monitoring of electrical loads.
• Power factor measurement – for evaluating the PF value and the load characteristics.
• Mains frequency measurement – for 50/60Hz systems.
• LCD display – for local viewing of the main parameters.
• Wi-Fi 2.4GHz connection – for remote monitoring via the internet.
• Tuya Smart and Smart Life support – for viewing data on a phone.
• Historical energy data – for analysing consumption trends.
• Fault notifications – when the configured limits are exceeded.
• COM/NO signal output – for controlling an external control or disconnection device.
• DIN rail mounting – for integration into a standard electrical panel.

• Overvoltage protection – response when the voltage exceeds the set limit.
• Undervoltage protection – response when the voltage falls below the set limit.
• Overcurrent protection – response when the current exceeds the set value.
• Phase-loss protection – response when one phase of the three-phase network is lost.
• Leakage current protection – using an additional residual current transformer.

Additional external components are used for certain measurement and protective disconnection functions.

• Three-phase split-core current transformers – for current measurement according to the supplied wiring diagram.
• Residual current transformer – for monitoring electrical leakage current.
• Circuit breaker with 230V shunt trip – for automatic disconnection of the power supply.
• Contactor – for switching the load on or off according to the command from the meter’s signal contact.

When using a three-phase circuit breaker with an integrated 230V shunt trip, the meter’s signal contact may be used in the shunt trip control circuit.

One wire of the shunt trip is connected to phase C on the output side of the circuit breaker, while the control circuit is formed through the meter’s COM and NO contacts.

The exact wiring diagram must be checked against the diagrams provided by the manufacturers of the energy meter, circuit breaker and shunt trip.

• In solar power systems – for monitoring energy import and export.
• In commercial buildings – for analysing total or individual circuit energy consumption.
• In manufacturing facilities – for monitoring the loads of equipment, workshops and production lines.
• In distribution boards – for measuring three-phase network parameters and electrical energy.
• In energy management systems – for remote data monitoring and analysis.
• In offices, shops and warehouses – for controlling electricity consumption.
• In EV charging and energy storage systems – for monitoring energy flows and loads.
• In smart IoT projects – for transmitting electrical data to the Tuya ecosystem.

For example, a commercial building has a three-phase 3P+N solar power system installed. During the day, part of the solar energy is consumed on site, while surplus energy is exported to the public electricity grid.

The bidirectional energy meter records energy in both directions and displays voltage, current, power, frequency and power factor. The data is transmitted via Wi-Fi to the Tuya Smart or Smart Life app.

The person responsible for the facility can monitor the current load on a phone, review historical energy data and receive notifications when set limits are exceeded. When an external contactor or circuit breaker with a shunt trip is connected, the meter can initiate disconnection of the power supply.

For a solar power system owner: allows energy drawn from the grid and surplus energy exported to the grid to be viewed.

For an energy specialist: provides information about phase load, voltage, current, power factor and the overall energy balance.

For a manufacturing company manager: helps remotely monitor energy consumption and analyse load changes.

For an automation designer: allows measurement data, notifications and the signal output to be integrated into a wider control system.

For an installer: the supplied wiring diagram must be followed, current and residual current transformers must be installed correctly and the external disconnection device must be connected properly.

The device is installed in a three-phase electrical panel, therefore the network type, wiring diagram, current direction and connection of additional components must be checked before installation.

• Check that the network is 3-phase, 4-wire – 3P+N.
• Check compatibility with the rated voltage and frequency.
• Follow the L1, L2, L3 and N terminal sequence.
• Check the energy flow direction and the direction of the current transformers.
• Do not use the signal contact to switch a high-power load directly.
• Use a compatible residual current transformer for the leakage function.
• Connect the shunt trip only according to the manufacturer’s wiring diagram.
• Before switching on, check terminal tightness and conductor cross-section.
• Use the device in a dry, enclosed electrical panel.
• Installation, parameter configuration and testing must be carried out by a qualified electrician.

Quick selection guide

Choose the smart three-phase bidirectional Wi-Fi energy meter when you need to combine solar energy import and export metering, three-phase network parameter monitoring, an LCD display and remote access through the Tuya app in one device.

Smart three-phase solar energy monitor with Wi-Fi and bidirectional metering

The smart three-phase bidirectional energy meter is designed for 3P+N solar power systems, commercial buildings, production systems, distribution boards and energy management projects where both total kWh consumption and energy-flow direction must be monitored.

The device measures voltage, current, active and reactive power, frequency, power factor and imported and exported electrical energy. The integrated LCD screen displays data in the electrical panel, while the 2.4GHz Wi-Fi connection allows it to be monitored through the Tuya Smart or Smart Life app.

When used with additional current and residual current transformers and a suitable external disconnection device, the meter can be integrated into an overvoltage, undervoltage, overcurrent, phase-loss and leakage protection system. Additional transformers, contactor, circuit breaker and shunt trip are not included.