It seems like that would be something that's hard to put a value on. It's essentially the same thing that Tesla is providing to their Model S/X owners in Europe (plus the CCS plug adapter), and I believe they're charging less than €200. Similarly, the Power Line Communication module for the Chevrolet Bolt EV is only about $150.
How much more would a crowd-sourced version cost?
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...-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.