Smart energy meter mastersheet

This page brings together everything about using smart energy meters with EVC 2: choosing a measurement method, supported meters, RS-485 settings, wiring, configuration in the app, and troubleshooting.

Introduction

EVC 2 can communicate with a dedicated smart energy meter and adjust its charging power based on the meter's readings. A meter enables:

• Dynamic load balancing (DLB) – protects the home's electrical installation from overload by adjusting the charging power to the total load.
• Solar charging – uses surplus solar power for charging (supported meters only).
• Dynamic load management (DLM) – a meter connected to the primary charger lets a group of chargers balance against the total load.
• MID metering – data from an external energy meter can be used for power consumption calculations and OCPP.

Note: The smart energy meter should always be installed in the main electrical cabinet, so it measures the total load of the installation.

Choosing a measurement method

Method	How it connects	Best suited for	Things to consider	More information
Modbus RTU meter	Wired RS-485 connection to the charger's Meter port.	Installations where the electrical cabinet is being reworked anyway; low-latency control; locations with unstable Wi-Fi.	Requires a data cable between the cabinet and the charger.	Modbus RTU meters
Modbus TCP meter	Meter and charger connected to the same local network (Wi-Fi or Ethernet).	Installations where power cables were laid in advance without data cables, or where the distance from the cabinet to the charger is long.	The charger and the meter must be on the same network.	Modbus TCP meters
P1 meter	HomeWizard P1 dongle: plugs into the P1 port of the utility smart meter and connects over Wi-Fi. SmartStuff P1 converter: connects the P1 port to the charger over RS-485.	Fast installation with no work in the electrical cabinet.	The utility smart meter must have a compatible P1 port.	HomeWizard P1 dongle SmartStuff P1 converter
CT clamps	Clamps on the incoming power lines, wired directly to the charger.	Installations where the electrical cabinet is close to the charger.	Keep the distance under 15 m; it can be extended up to 100 m with quality wiring, a clean installation and proper testing.	CT clamps

Supported meters

Modbus RTU meters

Brand	Models	MID certified	Solar support	Technical information	RS-485 settings
Carlo Gavazzi	1-phase: EM111, EM112, ET112 3-phase: EM330, EM340, ET330, ET340, EM530, EM540	PF variants, EM530, EM540	EM111, EM112, EM340, EM530, EM540	Carlo Gavazzi technical information	Carlo Gavazzi settings
Siemens	3-phase: PAC1020, PAC2200, PAC3100, PAC3120, PAC3200, PAC3220, PAC4200	–	✓	Siemens technical information	Siemens settings
ABB	1-phase: A41, A42, B21 3-phase: A43, A44, B23, B24, EV3	✓	–	ABB technical information	ABB settings
Eastron	1-phase: SDM230-M 3-phase: SDM54-M, SDM72D-M V2, SDM72CT-M 1- or 3-phase: SDM630 series	All except SDM72CT-M and SDM630MCT-LR	✓	Eastron technical information	Eastron settings
Inepro	3-phase: PRO380-Mod	✓	✓	Inepro technical information	Inepro settings
Chint (OEM only)	1-phase: DDSU 666 3-phase: DTSU 666, DTSU666-CT	✓	✓	Chint technical information	Chint settings
Entes	1-phase: ES-45LS	✓	–	Entes technical information	Entes settings
Acrel	3-phase: DTSD 1352	✓	✓	Acrel technical information	Acrel settings
Phoenix Contact	3-phase: EEM-MA370-R	–	✓	Phoenix Contact technical information	Phoenix Contact settings

Note: The charger supports only OEM Chint meters. White-labelled Chint meters, such as the CHINT DTSU666-H, the DTSU666 SUNGROW, or a DTSU666-CT with an "X" on its label, cannot communicate with the charger.

Modbus TCP meters

Meter	Connection	Setup	Details
Shelly Pro 3EM	LAN or Wi-Fi	Connecting Shelly Pro 3EM	Technical information
HomeWizard P1	Utility meter P1 port, Wi-Fi	Connecting HomeWizard P1	Technical information
Eastron SEM 3 WL	Wi-Fi	Network meter setup	Technical information

RS-485 default parameters

The energy meter's parameters must match the parameters set on the charger. The charger's default values for each brand are listed below; all of them can be changed in the app.

Brand	Modbus address	Baud rate	Parity	Stop bits	Notes
Carlo Gavazzi	1	9600	None	1
Siemens	126	19200	None	2
ABB	1	9600	Even	1	On the ABB B23, it is recommended to swap the A and B wires.
Eastron	1	9600	None	1	Eastron meters take longer to boot than other meters.
Inepro	1	9600	Even	1
Chint	1	9600	None	1	DTSU 666 and DDSU 666.
Entes	1–99	9600	None	1	The factory default address is the last two digits of the meter's serial number.
Acrel	1	9600	None	1
Phoenix Contact	1	9600	Even	1

You can use two meters with different addresses. Both meters share the same settings in the installer menu.

Wiring and installation

Note: Make sure the power is off before wiring.

• Meter port vs. DLM port: the interface board has two RS-485 ports. Connect energy meters to the Meter port, which is used for load balancing, solar and the MID meter. The DLM port is used only for connecting DLM devices. See 2x RS-485 support.
• Cable: a twisted-pair cable is recommended for RS-485 communication.
• Communication errors: if the meter doesn't communicate, swapping the A and B wires may resolve the issue.
• Wiring diagrams: each brand's technical information page (linked in the supported meters table) includes its wiring diagram. Wire colours in the diagrams are only examples.
• Powering the meter: to connect the meter to a power source, follow the manufacturer's installation manual.

Meter port and DLM port on the interface board

Twisted-pair cable example

Configuration in the app

Modbus RTU meters

1. Make sure the charger firmware and the app are updated to the latest version.
2. Enter the Installer menu, open Dynamic Load Balancing and enable Load Balancing.
3. Select Modbus RTU and press Search For Device.
   
4. If the charger does not recognise the meter, go to Manual Setup and choose your meter model from the presets, or enter the values from the RS-485 parameters table manually.
   
5. Press Connect.

Possible statuses:

• Connected – the meter is configured correctly.
• Disconnected – a wrong parameter value is set on the charger, or the meter is not wired correctly.
• Wrong type – the meter configuration does not match the connected meter.
• Not supported – the connected meter is not compatible with the installation.

Modbus TCP meters

1. Connect both the meter and the charger to the same network. The charger can connect via Wi-Fi or Ethernet.
2. Set up the meter in its own app (for example Shelly Smart Control or HomeWizard) and note the IP address assigned to it.
   
3. In the charger app, go to the Load balancing section, choose Network meter and select the model you're using.
   
4. Enter the meter's IP address and set Max grid load to the value allowed by the grid.
   
5. Check that the status shows the network meter has connected.

CT clamps

1. Connect each CT clamp to its dedicated terminal (blue wire to B, red wire to A). The clamp direction must point towards the source (away from the charger).
   
2. In the app's Load balancing section, select CT clamps and set Max grid load to the maximum current available in your grid (for example, your main breaker rating).
3. Press Calibrate. Before calibration, the CT clamp must be connected to the port but not clamped around the cable.
   

Required CT clamp specifications: rated current up to 150 A (recommended maximum), turn ratio 3000:1, and no integrated burden resistor.

Key settings

• Max power from grid (Installer menu) – when using dynamic load balancing, the maximum current per phase that can be supplied to the whole electrical installation. Usually the rated current of the main circuit breaker.
• Energy meter type – select 1-phase or 3-phase to match the connected meter.

Meters and charger features

• Dynamic load balancing: the charger adjusts its power based on the meter's readings. If the meter detects less than 6 A available on any phase, the charger switches from 3-phase to 1-phase mode until 6 A is available on all phases. See Dynamic load balancing.
• Solar charging: meters marked with solar support in the supported meters table can be used for solar charging. Solar panel generation is shown as export to the grid. See Solar integration.
• Dynamic load management: the primary charger in a DLM group can have a smart meter or CT clamps connected for dynamic load calculations. Both Modbus RTU and network (TCP/IP) meters can be used. See Dynamic load management.
• MID meter: data from an external energy meter can be used for power consumption calculations. This function is activated with a setting in the app, and the meter's total values are also used in OCPP.

Phase switching during lack of power

DLM with a smart meter

Diagnostics and troubleshooting

Before contacting support, check that:

• The meter is wired to the charger's Meter port, not the DLM port.
• The A and B wires are connected correctly. If the meter doesn't communicate, try swapping them.
• The meter's RS-485 parameters (address, baud rate, parity, stop bits) match the values set on the charger.
• The meter type (1-phase or 3-phase) in the Installer menu matches the connected meter.
• The charger firmware and the app are updated to the latest version.
• The meter is on the supported meters list. Chint meters must be OEM versions.
• If you use CT clamps, they are calibrated and pointing towards the source (away from the charger).

The Diagnostics tab in the app shows live data from the energy meter:

• Import from grid – the power currently drawn from the grid, as measured by the meter.
• Export to grid – surplus solar power currently being fed back to the grid.

An orange LED on the charger indicates an active warning, including energy meter problems. Check the live data in the app to identify the cause, then use the table below.

Live data from the energy meter

Warning	Meaning	What to do
Energy meter comm error	Communication error with the DLB, DLM or solar energy meter.	Check the RS-485 connection to the meter and inspect the cable. Check that the meter is working and that the devices are configured properly.
Emeter wrong type	The connected meter does not match the meter type (1-phase/3-phase) set in the Installer menu.	Set the correct meter type in the Installer menu.
E-meter unidentified	The meter is not supported or could not be identified.	Check that the meter is compatible (see the supported meters table).
DLB CT clamps not calibr	The CT clamps are not calibrated.	Calibrate the CT clamps.
kWh meter faulty wiring	The kWh meter does not measure the charger's load correctly.	Change the kWh meter location.
Energy meter kWh comm fail	Communication error with the kWh (MID) meter.	Check the RS-485 connection.
Energy meter kWh wrong type	The connected kWh meter does not match the type (1-phase/3-phase) set in the Installer menu.	Check that the kWh meter configuration is correct.
Energy meter kWh unidentified	The kWh meter is not supported or could not be identified.	Use a supported meter.

If the issue persists, report it via VIP Helpdesk or your sales manager, with as much detail as possible (photos, videos, etc.).

Related pages

• Dynamic load balancing
• Dynamic load management
• Supported energy meters
• Modbus RTU meters, Modbus TCP meters, HomeWizard P1 dongle, CT clamps
• Troubleshooting guide and In-app diagnostics