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  • New item   Modular three-phase energy meter | wireless remote reading | 4G | Modbus RTU | 3×230/400 V | DIN | ESADW300
    New item   Modular three-phase energy meter | wireless remote reading | 4G | Modbus RTU | 3×230/400 V | DIN | ESADW300 1

    Modular three-phase energy meter | wireless remote reading | 4G | Modbus RTU | 3×230/400 V | DIN | ESADW300

    Code: ESADW300
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    ESADW300 – a three-phase energy meter with an LCD display, CT operated (3x5 A) and DIN rail mounted, built for remote consumption monitoring where there is no wired network. It transmits data over 4G mobile, Wi-Fi, LoRaWAN or RS485, using the Modbus RTU, Modbus TCP or MQTT protocols. Accuracy class 0.5S suits energy monitoring in solar plants, buildings and factories.

  • Product description

    Modular three-phase energy meter | wireless remote reading | 4G | Modbus RTU | 3×230/400 V | DIN | ESADW300

    ESADW300 – a three-phase energy meter with an LCD display, CT operated (3x5 A) and DIN rail mounted, built for remote consumption monitoring where there is no wired network. It transmits data over 4G mobile, Wi-Fi, LoRaWAN or RS485, using the Modbus RTU, Modbus TCP or MQTT protocols. Accuracy class 0.5S suits energy monitoring in solar plants, buildings and factories.

    Key idea:
    Many sites that need monitoring have neither an internet cable nor Wi-Fi – rented production premises, a solar park in the open, a pumping station 40 km away, a construction site. With a SIM card fitted, the ESADW300 sends readings over 4G straight to a server or cloud via MQTT, so energy data is available without any local infrastructure. Where a network is present on site, the same meter connects over Wi-Fi or RS485 Modbus. This is a 0.5S-accuracy monitoring device, not an MID billing meter.
    Rated current
    3x5 A, CT operated
    Rated voltage
    3×230/400 V AC (up to 3x660–792 V L-L), 50/60 Hz
    Communication
    4G, Wi-Fi, LoRaWAN, RS485; Modbus RTU, Modbus TCP, MQTT
    Accuracy class / mounting
    0.5S; DIN rail

    How it works

    Voltage is measured directly from the three phases, while current is measured through external current transformers whose secondary winding delivers up to 5 A to the meter. Once the CT ratio has been set, the device calculates true power and energy, displays them on the LCD screen and accumulates a register of 0–9999.99 kWh. This arrangement lets it measure an incoming supply of any size while the meter itself stays small and does not heat up.

    The communication side is the essence of this model. With a SIM card fitted, the meter publishes data over the 4G network using MQTT to a cloud platform or company server, or responds to Modbus TCP requests. On a site with Wi-Fi, the same happens over the wireless network. LoRaWAN suits large areas with low data traffic (e.g. a solar park), while RS485 with Modbus RTU suits a classic wired connection to a local controller or SCADA. The installer chooses whichever channel is available on site, and the data format on the server stays the same.

    What makes the ESADW300 worthwhile?
    A single model covers four communication scenarios, so an integrator doesn't need to stock separate meters for wired and wireless sites. 4G with a SIM means you see the consumption of a rented property or a remote pumping station from the office on the very day it's installed – no trip to read the meter and no negotiating with the tenant over their Wi-Fi.

    Technical specifications

    Model ESADW300
    Product type Three-phase energy meter with wireless remote reading, CT operated
    Rated voltage 3×230/400 V AC (up to 3x660–792 V L-L), 50/60 Hz
    Rated current 3x5 A, CT operated
    Communication 4G, Wi-Fi, LoRaWAN, RS485; Modbus RTU, Modbus TCP, MQTT
    Accuracy class / mounting 0.5S; DIN rail
    Energy register 0–9999.99 kWh
    Display LCD
    SIM card Required for 4G connectivity, format per manufacturer datasheet
    Operating temperature -25…+45 °C
    Dimensions 87.8 × 72 × 71 mm
    Certificates CE, IEC, LVD
    MID certificate Not stated – check manufacturer datasheet
    Application Solar plants, building management systems, manufacturing plants

    Key features

    • 4G remote reading – with a SIM card, data is sent to a server without local internet.
    • Four communication channels – 4G, Wi-Fi, LoRaWAN and RS485, chosen to suit site conditions.
    • Three protocols – Modbus RTU for wired integration, Modbus TCP and MQTT for cloud platforms.
    • 0.5S accuracy class – reliable data even at low load, suited to cost analysis.
    • CT-operated measurement – any size of incoming supply, with the meter staying compact.
    • LCD display – readings visible on site as well as remotely.

    Where is it used?

    • Rented production and commercial premises – consumption reading without a site visit
    • Solar parks and rooftop installations – monitoring generation and consumption
    • Remote pumping stations, communication towers, farm sites without internet
    • Construction sites and temporary supplies
    • Building management systems via Modbus TCP or RS485
    • Factory energy monitoring and cost allocation across workshops
    • Monitoring an energy portfolio across several sites on one cloud dashboard
    • Remote control of EV charging stations and cold stores

    Use by need

    For the domestic user.
    At home, this meter only makes sense with a solar installation or a property without internet: fit a SIM card and you see generation and consumption on your phone or computer via the MQTT platform, while the Wi-Fi option suits a home where a network already exists.
    For businesses and industry.
    For a landlord, it's a way to read every tenant's consumption from the office on the same day; for a factory, it's a way to see each workshop's load in real time. Several sites in different towns are brought together into one dashboard over 4G and MQTT, with no local network administration needed.
    For electricians / engineers.
    Select a CT with a …/5 A secondary winding matched to the actual line current, and observe polarity and phase correspondence. Before installation, check 4G coverage at the panel location – a metal cabinet weakens the signal and may require an external antenna. Agree with the client on a data SIM tariff and the MQTT broker or Modbus TCP server address; for the RS485 option, agree the Modbus RTU address and baud rate.

    Practical example

    A company rents three warehouses in different towns, each with a 3x160 A supply and no internet. An ESADW300 with 200/5 A transformers and a SIM card is fitted in each panel (a cheap M2M data tariff with 50 MB a month is more than enough for readings). Every 15 minutes the meters send data over MQTT to a cloud platform, and at month end the administrator prepares invoices for all tenants in 10 minutes. In addition, the system flags whenever a warehouse uses more than 5 kW at the weekend – usually heating left switched on.

    Pros

    • 4G with SIM – readings from sites with no local internet at all.
    • Flexible integration – Modbus RTU, Modbus TCP and MQTT suit both older SCADA and cloud platforms.
    • 0.5S accuracy – a higher class than typical class 1 monitoring meters.
    • CT operated – one model from small branch circuits to high-power supplies.
    • LCD on site – readings visible even without a connection.
    • DIN mounting – a standard panel location, no separate enclosure.

    Cons / limitations

    • MID certificate not stated – billing a supplier or legally binding resale needs a certified meter; here the readings are for monitoring and internal allocation.
    • Current transformers and their correct ratio are required – direct connection is not possible.
    • 4G needs a SIM card with a data plan and coverage at the panel location – an ongoing connectivity cost.
    • Energy register up to 9999.99 kWh – it overflows quickly on high-power sites, so data must be continuously accumulated on the server.
    • Operating temperature only up to +45 °C – hot technical cabinets need ventilation; check the exact SIM format against the datasheet.

    Safety and installation notes

    • Never leave a CT secondary circuit open while under load – short-circuit the transformer terminals before disconnecting the meter.
    • Protect the voltage measuring circuit with its own fuses; the meter does not protect either the wiring or the equipment.
    • Observe CT polarity and phase correspondence – if reversed, you will get incorrect power and energy.
    • Check the 4G and Wi-Fi signal with the panel door closed; a metal cabinet may require an external antenna.
    • Secure access to the server or MQTT broker with a password or certificate – the meter sends data over the internet.
    • Install in an environment of -25…+45 °C, away from heat-generating equipment in the panel.

    Quick selection guide

    Rated current
    3x5 A, CT operated
    Rated voltage
    3×230/400 V AC (up to 3x660–792 V L-L), 50/60 Hz
    Communication
    4G, Wi-Fi, LoRaWAN, RS485; Modbus RTU, Modbus TCP, MQTT
    Accuracy class / mounting
    0.5S; DIN rail
    Suitable when you need:
    • to read consumption from a site without internet – via 4G with a SIM card;
    • to integrate energy data into a cloud platform (MQTT) or SCADA / BMS (Modbus);
    • to monitor several remote sites or tenants from one place.
    Check before use:
    • whether CTs with a 5 A secondary winding matched to the actual current have been selected;
    • whether 4G (or Wi-Fi / LoRaWAN) coverage exists at the panel location;
    • whether a SIM card with a data plan and a server/broker to receive the data are available;
    • whether the site requires an MID certificate – if so, check the datasheet.
    Important reminder:
    The ESADW300 is a remote monitoring meter – its readings suit cost control and internal allocation, but without an MID certificate they are not a basis for official billing. A 4G connection means an ongoing SIM tariff, which should be included in the project budget.

    FAQ

    Does the site need internet?
    No – with a SIM card fitted, the meter sends data over 4G; Wi-Fi, LoRaWAN or RS485 are used where such infrastructure exists.
    What kind of SIM card is suitable?
    A card from any operator with a data plan (M2M tariffs are the cheapest); check the exact format in the manufacturer's datasheet.
    Can it be connected directly, without a CT?
    No – the 3x5 A current inputs are for current transformers only.
    Is it suitable for billing tenants?
    Yes, for internal allocation by agreement; legally binding metering requires an MID-certified meter.
    What's the difference between MQTT and Modbus?
    With MQTT the meter itself publishes data to a cloud broker; with Modbus it responds to a controller's or SCADA's requests over a wire (RTU) or network (TCP).
    What happens when the register reaches 9999.99 kWh?
    The reading starts again from zero, so the server must accumulate the increments continuously – standard practice for monitoring platforms.

    Modular three-phase energy meter | wireless remote reading

    ESADW300 – a modular three-phase energy meter, 3×230/400 V, CT operated (3x5 A), accuracy class 0.5S, with an LCD display and 4G, Wi-Fi, LoRaWAN and RS485 connectivity over the Modbus RTU, Modbus TCP and MQTT protocols. Designed for remote energy monitoring at rented properties, solar plants, remote pumping stations and factories, where data must reach a server without local network infrastructure.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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