Dynamic Load Management EVC2

DYNAMIC LOAD MANAGEMENT

Dynamic load management (DLM) is a sophisticated feature that empowers users to efficiently control electric load by managing a group of chargers installed within a single circuit. Through the implementation of Modbus RS-485 or TCP/IP communication, the chargers are able to communicate with one another and dynamically adjust their charging power in response to the load on the grid, ensuring optimal charging operations and grid stability.

DLM VIA MODBUS RTU

DLM with smart meter

This configuration enables users to efficiently manage the electric load between chargers and other electronic devices. By leveraging the capabilities of a smart meter, precise control and optimization of the overall load can be achieved.

Example using Modbus RTU meter:

--> Supported energy meters

DLM without smart meter

In cases where the focus is solely on managing the electricity load between chargers and there are no additional electronic devices contributing to the load, this option can be utilized. It offers a simplified approach to load management, tailored specifically to charger interactions.

DLM Connection

Dynamic Load Management (DLM) is achieved through a carefully interconnected system of chargers, where communication is governed by a designated "Primary" charger, dictating instructions to the remaining "Secondary" chargers. These chargers must be interconnected serially (daisy chained), each requiring the use of UTP twisted pair cables for communication via the A and B pins.

Serial connection:

DLM VIA MODBUS TCP/IP

DLM over WiFi or Ethernet

In cases where the installation has Ethernet or WiFi access - Load management is also available as long as chargers are on the same network.

Just like the Modbus RTU version - the primary device can have a smart meter / CT clamp connected to it for dynamic energy calculations. Both Modbus RTU and network meters (TCP/IP) are allowed in this setup.

--> Supported energy meters

--> Modbus RTU setup

--> Modbus TCP/IP setup

--> CT clamp setup

TELTONIKA ENERGY APP SETTINGS

Once the chargers are properly connected to the electrical grid and interconnected to each other, the next step is to configure the settings for each charger using the Teltonika Energy app.

Below, you will find a comprehensive list of the settings that should be adjusted to achieve DLM functionality.

Max power from grid

It is very important to set max power from grid parameter correctly in the PRIMARY charger if you want to use DLM. This parameter shows how much current you have in the circuit you want to balance. That means you have to set all available amperes.

If for example in the Primary charger you will set lower current, DLM might not work correctly and the chargers might not even start the charging process.

For the secondary chargers, this parameter is not as critical. It is advisable to set it to a maximum of 16 A (for 11 kW chargers) or 32 A (for 7.4/22 kW chargers).

Primary Device Configuration

The first thing would be to select the primary device that would control the rest of the group communication protocol between the master-slave and master-meter.

It should only be enabled for one charger per group only, the primary charger will handle all the calculations, establish communication with the smart meter and control whole group (maximum group size is 20 devices).

This setting enabled the charger as the primary charger and allows to change the settings that will affect the whole group:

1."Primary device" – Confirms that this is the primary device that will control the group

2."Type"

• Dynamic – using a smart meter to balance
• Static – balancing only from Max power from grid parameter

3."Secondary device count" the number of secondary devices

4."Secondary device ID" start ID from which chargers will be counted (If it‘s set „2“, the first secondary device must have address 2 and this address must be increased by 1 with each new secondary device

5."Advanced settings" - (More info below)

6."Check status" – possibility to check communication type with secondary devices

Advanced settings

Advanced settings are the settings that most of the time are left default. Only on special occasions, those settings must be changed.

1. "Phase connected" – detected automatically

2. "Phase sharing mode" – type of chargers in group

3. "Current sharing mode" – Current is distribution mode

• Equal - Energy will be distributed equally among all active chargers
• By Priority - Energy will be distributed based on priority. Chargers will be prioritized according to their charging state.

4. "Communication timeout" – delay before warning

5. "Communication settings" – settings must be the same for all the devices in the group

• RS-485 baud rate
• RS-485 parity
• RS-485 stop bit

Secondary device configuration

After Primary device configuration, it’s mandatory to enable Dynamic load management mode and correctly set-up each secondary device. (This action must be repeated for each new secondary device)

For each secondary device few settings must be adjusted:

• Max power from grid - It is advisable to set it to a maximum of 16 A (for 11 kW chargers) or 32 A (for 7.4/22 kW chargers)

• Secondary device – enabled
• Secondary device ID – for the first device it must be as set in the master, for each new secondary device this must be increased by 1
• Advanced settings –  must match with the primary device settings