Contents of my solar car charger

My electric car charger is built into a case more normally used for household consumer units.  From left to right its contents are:

  1. 2 slots – Double pole on/off switch to isolate the incoming mains supply entering from below.
  2. 4 slots – Programmable Logic Controller (PLC) which takes 2 inputs (remote on/off via radio link and contactor status – see item #4) and generates 1 of 4 outputs (corresponding to off, 6 Amps, 10 Amps or 16 Amps).  Beneath the PLC (and not visible inside the case) sits a circuit board with an array of resistors corresponding to the required current settings.
  3. 2 slots – Protocol controller which handles the Mode 3 handshake with the car and switches between current settings based on the selected resistor.
  4. 1 slot – Contactor which turns the power to the vehicle on/off based on the output from the protocol controller.  Cable to car exits below.
  5. 1 slot – unused.

The dedicated charger circuit is fed from a RCBO in a small consumer unit on the other side of the garage which combines overcurrent protection (20 Amps) and Type A residual current detection (30 mA).

 

 

 

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