Eastron SDM630-Modbus Single-Phase 100A Smart Energy Meter

Eastron SDM630 Modbus Energy Meter - Professional Solution for Solar Installations

The Eastron SDM630 Modbus energy meter (reference SDM630Modbus) is the professional measurement solution for photovoltaic installations with storage systems. This bi-directional multifunction meter provides accurate monitoring of your energy flows, enabling maximum optimisation of your self-consumption and intelligent management of your solar production.

Compatibility with Solax inverters

The SDM630 Modbus is specifically compatible with the most advanced ranges of Solax inverters:

• Solax SK-SU: Single-phase inverters with integrated storage
• Solax X3-Hybrid: Three-phase hybrid inverters from 4 to 15 kVA
• Solax X3-Fit: Compact three-phase solutions

This native compatibility guarantees smooth communication via RS485 Modbus RTU protocol, enabling the meter to transmit production, consumption and grid injection data to your inverter in real time for intelligent battery storage management.

Single and three-phase versatility

The device measures and displays the electrical characteristics of three types of network:

• Single-phase 2-wire (1P2W): Standard residential installations, power up to 23 kW
• Three-phase 3-wire (3P3W ): Three-phase networks without neutral, specific industrial configurations
• Three-phase 4-wire (3P4W ): Three-phase networks with neutral, commercial and industrial installations

This unique versatility makes the SDM630 a universal meter suitable for all types of photovoltaic installation, from domestic to industrial.

100A direct connection - Simple and economical

The SDM630 Modbus supports direct connection up to 100A, eliminating the need for external current transformers (CTs) in most installations. This direct design offers multiple benefits:

• Reduced costs: No need to purchase expensive external CTs
• Simplified installation: direct wiring, fewer connections, fewer errors
• Increased reliability: Fewer components = fewer points of failure
• Optimum accuracy: Direct measurement without CT-related signal losses
• Space saving: more compact enclosure without additional CTs

Measured parameters - Complete monitoring

The SDM630 meter provides a comprehensive overview of your energy flows:

Bidirectional measurement - Heart of the solar system

The bi-directional IMP/EXP (Import/Export) function is essential for photovoltaic installations with storage:

Import mode (IMP): Measures the energy drawn from the grid when your solar output is insufficient or your batteries are discharged. Allows you to accurately account for your grid consumption.

Export mode (EXP): Measures the excess energy injected into the grid when your production exceeds your consumption and your batteries are full. Essential for tracking your surplus energy sold or injected.

This dual measurement enables your Solax inverter to make the best decisions in real time: charge the batteries, supply loads, inject energy into the grid or draw energy from the grid according to your self-consumption strategy.

RS485 Modbus RTU interface

The integrated RS485 Modbus RTU protocol ensures robust, universal communication with your equipment:

• Inverter connection: Direct communication with Solax inverters for automatic control
• Supervision systems: Integration into SCADA, home automation and BMS platforms
• Remote monitoring: Data upload to servers, cloud, mobile applications
• Multi-device: Serial connection of several meters on the same bus (configurable Modbus addresses)
• Long distance: up to 1200m RS485 cabling, perfect for extended installations

Pulse outputs - External metering

The SDM630 has two configurable pulse outputs, enabling :

• Connection to traditional mechanical meters
• Interfacing with external billing systems
• Signalling of energy events by light or sound
• Triggering of PLCs or relays according to power thresholds

Intuitive display and navigation

The high-visibility backlit LCD screen displays all measured values in real time. The menu system makes it easy to navigate between the various parameters:

• Overview: Voltage, current, instantaneous power
• Energy: Import/export kWh meters, kVArh
• Network quality: THD, power factor, frequency
• Demands: Peak currents per period
• Configuration: Modbus parameters, CT ratios (if used), pulse outputs

DIN rail installation - Professional mounting

The meter mounts on a standard 35mm symmetrical DIN rail, making it easy to integrate into your existing electrical cabinets. Its compact dimensions (100×76×66mm) and low weight (400g) make it easy to install, even in crowded enclosures.

Wiring is via robust screw terminals which accept conductor cross-sections adapted to the currents measured (up to 100A direct). The connection diagrams supplied cover all configurations: single-phase 2-wire, three-phase 3-wire, three-phase 4-wire.

Professional accuracy - Class 1 / B

The SDM630 Modbus has an accuracy better than class 1 / B according to EN 62053-21 and EN 50470-3. This certified accuracy guarantees :

• Measurement error of less than 1% under nominal conditions
• Data reliability for self-consumption optimisation
• Regulatory compliance for commercial applications
• Accurate long-term energy traceability

Applications in photovoltaic installations

Self-consumption optimisation: The meter continuously measures your solar production and your instantaneous consumption. Your Solax inverter automatically adjusts the energy flow: surplus to batteries, battery discharge if consumption > production, grid injection if batteries are full.

Dynamic load management: By measuring import/export flows, the system can control deferrable loads (water heater, swimming pool pump, recharging point) so that they are activated only when there is a solar surplus, thereby maximising self-consumption.

Production/network injection monitoring: Get an accurate picture of your photovoltaic production, your actual self-consumption and your network injection. This data is essential for calculating your self-consumption rate and profitability.

Battery energy flow control: The meter allows you to monitor the charge/discharge cycles of your batteries, optimising their use and extending their lifespan by avoiding unnecessary stress.

Industrial robustness and reliability

Designed to operate in demanding environments, the SDM630 offers :

• Extended temperature range: -25°C to +55°C, suitable for unheated equipment rooms
• IP51 protection: resistant to dust and water splashes
• Robust casing: industrial construction for maximum durability
• Electromagnetic immunity: Trouble-free operation in complex electrical environments

Summary of technical specifications

Wattuneed expert advice: For an optimal photovoltaic installation with storage, combine this SDM630 Modbus meter with a Solax hybrid inverter and a lithium battery system. The meter-inverter-battery trio communicates constantly to maximise your self-consumption and reduce your electricity bill by up to 70%.

Recommended complementary products

Optimise your solar installation with these compatible products:

SolaX X3-HYBRID three-phase hybrid inverter 6kVA

Single-phase inverter SolaX X1-HYBRID 3kVA

Discover all our energy meters

Solar batteries for energy storage

Technical support and resources

Our Wattuneed technical team will help you choose and install your energy meter. For personalised advice on integration with your Solax inverter, consult our technical support centre.

You can also read our practical guides on optimising self-consumption and intelligent battery storage management in our photovoltaic technical blog.

Connection diagram

Three-phase three-wire and four-wire

Single-phase two-wire