SmartEVSE
Smart Electric Vehicle Charge Controller
What is it?
It's a open source EVSE (Electric Vehicle Supply Equipment). It supports 1-3 phase charging, fixed charging cable or charging socket. Locking actuator support (3 different types). And it can directly drive a mains contactor for supplying power to the EV. It features a display from which all module parameters can be configured.
Up to 8 modules can be connected together to charge up to eight EV's from one mains connection without overloading it.
The mains connection can be monitored by the (optional) sensorbox or a modbus kWh meter. This allows smart charging.
Communication between the SmartEVSE(s) / Sensorbox or kWh meters is done over RS485(modbus).
The project consists of two parts:
- Smart EVSE controller
- Sensorbox
Features
- Fits into a standard DIN rail enclosure.
- Measures the current consumption of other appliances, and automatically lowers or increases the charging current to the EV. (sensorbox required)
- The load balancing feature let's you connect up to 8 SmartEVSE's to one mains supply.
- Switched 230VAC output, for contactor/relay.
- Powered RS485 communication bus for sensorbox / Modbus kWh Meters.
- Can be used with fixed cable, or socket and charging cable.
- Automatically selects current capacity of the connected cable (13/16/32A)
- Locking actuator support, locks the charging cable in the socket, automatically unlocks on a power failure.
- RFID reader support, restrict the use of the charging station to max 20 RFID cards.
- An optional modbus kWh meter will measure power and charged energy, and display this on the LCD.
- Built-in temperature sensor.
- All module parameters can be configured using the display and buttons.
- Setup can also be done through serial CLI.
- Firmware upgradable through serial bootloader.
New V2.20 features are:
- Added EVMETER and EVADR option to the menu. Use a modbus kWh meter to measure the charged energy.
- Added charged energy to the LCD (Smart/Solar mode)
- Uses condensed characters on the LCD, so the 'i' will not use the same space as the 'w'
- Increased the nr of nodes to 7.
- Added RFID reader option. Learn up to 20 RFID cards.
The Sensorbox
The Sensorbox should be placed where the Mains connection enters the building. Usually just after the kWh meter, this way it will be able to measure the total current per phase and send this information to the SmartEVSE.
In order to measure the current, Current transformers are used. Clip them around the L1,L2 and L3 wires, and plug the other end into the sensorbox.
Configuring the SmartEVSE
The SmartEVSE has a display, which shows the charging status, and if smart mode is used, also the measured current per phase. It is possible to configure all settings using the built-in menu.
Three buttons below the display are used for navigating the menu.
Hold the center button for 2 seconds to enter the menu. You can now use the left and right buttons to go to the different menu options.
Pressing the center button, selects the option, and allows you change the value (for example change the charging current)
Building the EVSE
In order to build a complete EVSE (charging station) you will need:
- SmartEVSE.
- 4 pole NO Contactor rated for the max charging current. (for example Hager ESC440 or ISKRA IKA432-40)
- Fixed charging cable or socket with locking solenoid.
- Enclosure with DIN rail.
- Terminal blocks (Wago TOPJOB S)
The EVSE needs to be protected with a circuit breaker and residual-current circuit breaker, usually located near or in the distribution board.
Purchase the SmartEVSE
You can buy a complete assembled SmartEVSEv2 here
Information on how to compile and setup the controller can be found on the smartevse.nl website.
The assembled SmartEVSE v2 modules come pre-programmed with the latest firmware (v2.20), and are fully tested!
Predefined electric meters
- Sensorbox (1)
- PHOENIX CONTACT EEM-350-D-MCB (2)
- Finder 7E.78.8.400.0212 (3)
- Eastron SDM630 (4)
- ABB B23 212-100 (5)
- SolarEdge SunSpec (6)
- WAGO 879-30x0 (7)
- Finder 7M.38.8.400.0212 (8)
- Custom (9)
Modbus
Baudrate is 9600bps 8N1 (8bit, no parity bit, one stop bit). All registers are 16 bit unsigned integers. Address depends on the Load Balancing configuration:
| Load Balancing | Modbus Address |
|---|---|
| Disabled/Master | 0x01 |
| Node 1 | 0x02 |
| Node 2 | 0x03 |
| Node 3 | 0x04 |
| Node 4 | 0x05 |
| Node 5 | 0x06 |
| Node 6 | 0x07 |
| Node 7 | 0x08 |
Broadcast to all SmartEVSE with address 0x09.
Modbus register have changed after version 2.20. Use this readme as reference for version 2.20 or older
Register 0x00*: EVSE status
| Register | Access | Description | Unit | Values |
|---|---|---|---|---|
| 0x0000 | R/W | State | 0:A / 1:B / 2:C / 3:D / 4:Node request B / 5:Master confirm B / 6:Node request C / 7:Master confirm C / 8:Activation mode / 9:B1 / 10:C1 | |
| 0x0001 | R/W | Error | Bit | 1:LESS_6A / 2:NO_COMM / 4:TEMP_HIGH / 8:Unused / 16:RCD / 32:NO_SUN |
| 0x0002 | R/W | Charging current | 0.1 A | 0:no current available / 6-80 |
| 0x0003 | R/W | EVSE mode (without saving) | 0:Normal / 1:Smart / 2:Solar | |
| 0x0004 | R/W | Solar Timer | s | |
| 0x0005 | R/W | Access bit | 0:No Access / 1:Access | |
| 0x0006 | R/W | Configuration changed (Not implemented) | ||
| 0x0007 | R | Maximum charging current | A | |
| 0x0008 | R/W | Number of used phases (Not implemented) | 0:Undetected / 1 - 3 | |
| 0x0009 | R | Real charging current (Not implemented) | 0.1 A | |
| 0x000A | R | Temperature | K | |
| 0x000B | R | Serial number | ||
| 0x0020 - 0x0027 | W | Broadcast charge current. SmartEVSE uses only one value depending on the "Load Balancing" configuration | 0.1 A | 0:no current available |
Register 0x01*: Node specific configuration
| Register | Access | Description | Unit | Values |
|---|---|---|---|---|
| 0x0100 | R/W | Configuration | 0:Socket / 1:Fixed Cable | |
| 0x0101 | R/W | Cable lock | 0:Disable / 1:Solenoid / 2:Motor | |
| 0x0102 | R/W | MIN Charge Current the EV will accept | A | 6 - 16 |
| 0x0103 | R/W | MAX Charge Current for this EVSE | A | 6 - 80 |
| 0x0104 | R/W | Load Balance | 0:Disabled / 1:Master / 2-8:Node | |
| 0x0105 | R/W | External Switch on pin SW | 0:Disabled / 1:Access Push-Button / 2:Access Switch / 3:Smart-Solar Push-Button / 4:Smart-Solar Switch | |
| 0x0106 | R/W | Residual Current Monitor on pin RCM | 0:Disabled / 1:Enabled | |
| 0x0107 | R/W | Use RFID reader | 0:Disabled / 1:Enabled | |
| 0x0108 | R/W | Type of EV electric meter | * | |
| 0x0109 | R/W | Address of EV electric meter | 10 - 247 |
Register 0x02*: System configuration (same on all SmartEVSE in a LoadBalancing setup)
| Register | Access | Description | Unit | Values |
|---|---|---|---|---|
| 0x0200 | R/W | EVSE mode | 0:Normal / 1:Smart / 2:Solar | |
| 0x0201 | R/W | EVSE Circuit max Current | A | 10 - 160 |
| 0x0202 | R/W | Grid type to which the Sensorbox is connected | 0:4Wire / 1:3Wire | |
| 0x0203 | R/W | CT calibration value | 0.01 | Multiplier |
| 0x0204 | R/W | Max Mains Current | A | 10 - 200 |
| 0x0205 | R/W | Surplus energy start Current | A | 1 - 16 |
| 0x0206 | R/W | Stop solar charging at 6A after this time | min | 0:Disable / 1 - 60 |
| 0x0207 | R/W | Allow grid power when solar charging | A | 0 - 6 |
| 0x0208 | R/W | Type of Mains electric meter | * | |
| 0x0209 | R/W | Address of Mains electric meter | 10 - 247 | |
| 0x020A | R/W | What does Mains electric meter measure | 0:Mains (Home+EVSE+PV) / 1:Home+EVSE | |
| 0x020B | R/W | Type of PV electric meter | * | |
| 0x020C | R/W | Address of PV electric meter | 10 - 247 | |
| 0x020D | R/W | Byte order of custom electric meter | 0:LBF & LWF / 1:LBF & HWF / 2:HBF & LWF / 3:HBF & HWF | |
| 0x020E | R/W | Data type of custom electric meter | 0:Integer / 1:Double | |
| 0x020F | R/W | Modbus Function (3/4) of custom electric meter | ||
| 0x0210 | R/W | Register for Voltage (V) of custom electric meter | 0 - 65530 | |
| 0x0211 | R/W | Divisor for Voltage (V) of custom electric meter | 10x | 0 - 7 |
| 0x0212 | R/W | Register for Current (A) of custom electric meter | 0 - 65530 | |
| 0x0213 | R/W | Divisor for Current (A) of custom electric meter | 10x | 0 - 7 |
| 0x0214 | R/W | Register for Power (W) of custom electric meter | 0 - 65534 | |
| 0x0215 | R/W | Divisor for Power (W) of custom electric meter | 10x | 0 - 7 / |
| 0x0216 | R/W | Register for Energy (kWh) of custom electric meter | 0 - 65534 | |
| 0x0217 | R/W | Divisor for Energy (kWh) of custom electric meter | 10x | 0 - 7 |
| 0x0218 | R/W | Maximum register read (Not implemented) | ||
| 0x0219 | R/W | WiFi mode | ||
| 0x021A | R/W | Limit max current draw on MAINS (sum of phases) | A | 9:Disable / 10 - 200 |
- Number in brackets in section "Predefined electric meters"