Open Source Smart EVSE
What is it?
It's a Smart EVSE, initially build to charge a Tesla Roadster at home. But improved to now also work with three phase charging (Model S).
The smart bit is, that it actively measures the current consumption of all appliances at home, and automatically lowers or increases the charging current to the EV.
The project consists of two parts:
- Smart EVSE controller (see above)
- Sensorbox with CT's (see below)
The Smart EVSE controller connects to the EV, but also to the Sensorbox over a serial RS485 connection.
features:
- Fits into a standard DIN rail enclosure
- selects current capacity of the connected charging cable automatically (13/20/32/63A)
- can optionally have a 8x2 character LCD
- setup through serial command line interface, things like MAX/MIN Current can be set
- serial bootloader, for firmware upgrades
The Sensorbox, has inputs for Current Transformers(CT's). These CT's measure the current draw per phase, and send this information over a RS485 connection to the Smart EVSE controller.
The Sensorbox should be installed in the area where the MAINS connection enters your house. Just click the CT's on the (three) Phase wires, and run a serial wire (CAT5 works fine) to the EVSE controller.
The project folders are as follows:
/bootloader microchip bootloader software
/cad 3D openscad files for the sensorbox
/eagle schematics and pcb layouts for the EVSE controller, Sensorbox (3PCurrentTX), and optional LCD
/pictures pictures of the boards, my single phase Roadster EVSE, and Three phase EVSE
/sourcecode Microchip MPLAB sourcecode and HEX files.
Files can be downloaded from here
Please feel free to modify, change or improve the code.
What is it?
It's a Smart EVSE, initially build to charge a Tesla Roadster at home. But improved to now also work with three phase charging (Model S).
The smart bit is, that it actively measures the current consumption of all appliances at home, and automatically lowers or increases the charging current to the EV.
The project consists of two parts:
- Smart EVSE controller (see above)
- Sensorbox with CT's (see below)
The Smart EVSE controller connects to the EV, but also to the Sensorbox over a serial RS485 connection.
features:
- Fits into a standard DIN rail enclosure
- selects current capacity of the connected charging cable automatically (13/20/32/63A)
- can optionally have a 8x2 character LCD
- setup through serial command line interface, things like MAX/MIN Current can be set
- serial bootloader, for firmware upgrades
The Sensorbox, has inputs for Current Transformers(CT's). These CT's measure the current draw per phase, and send this information over a RS485 connection to the Smart EVSE controller.
The Sensorbox should be installed in the area where the MAINS connection enters your house. Just click the CT's on the (three) Phase wires, and run a serial wire (CAT5 works fine) to the EVSE controller.
The project folders are as follows:
/bootloader microchip bootloader software
/cad 3D openscad files for the sensorbox
/eagle schematics and pcb layouts for the EVSE controller, Sensorbox (3PCurrentTX), and optional LCD
/pictures pictures of the boards, my single phase Roadster EVSE, and Three phase EVSE
/sourcecode Microchip MPLAB sourcecode and HEX files.
Files can be downloaded from here
Please feel free to modify, change or improve the code.
