Yes, I think the best bet would be focusing solely on the PLC module. The CCS socket will be unique to the end user because Europe and North America use a different socket, and some people might already have the contactors (e.g., from a previous CHAdeMO conversion). Worst case, people buy the parts they need to complete the system separately, or we could set up a group buy for Tycos, sockets, cables, etc. if it makes sense.Well there are a few key components:
1. GreenPHY PLC, cheapest one I found is this: PEV (Electro Vehicle) side PLC / Home Plug Green Phy communication Module for ISO/IEC15118 / DIN 70121 / SAE J2847/2 51 EUR
2. Singleboard computer capable of running ISO15118 stack, perhaps Beaglebone Black since it includes two CAN interfaces https://hr.mouser.com/ProductDetail/BeagleBoard-by-Seeed-Studio/102110420?qs=vmHwEFxEFR8FZOWBwz8ZDA== 40 EUR
3. Additional PCB with SAEJ1772 signaling and sampling, power suppply, etc electronics approx 50 EUR
so we are talking about 150 EUR just for the parts.
In addition you need:
1. At least two more high current DC contactors for connecting the CCS lines to battery pack (Tyco KiloVAC). around 200 EUR
2. High voltage, galvanically isolated voltage measuring input around 50 EUR
3. CCS socket, around 200-300 EUR.
As for the software, there is open source implementation in JAVA, RISE V2G – V2G Clarity, but it needs to be ported to the actual hardware, mostly by implementing calls to access J1772 CP and PP states and controling them. Also TCP/IP communication over PLC needs to be implemented.
I think 250-300 EUR just for the PLC module could be possible.
I might pick up a spare Chevy Bolt EV Power Line Communication module for about $150 just to look at it and see how it works and is put together. It might only speak the DIN SPEC 70121 standard, though, which could be limiting.