RobertSmalls,
You have it right except you open the door to the tricksters when you allow claims if the system is combined with 'low carbon' generation.
Following your own guidance that the thing that counts is the energy used 'BECAUSE OF' moving the vehicle, I reason that 'generation' of any kind, that exists independently of the vehicle, can not be 'combined' in a clear thinking person's mind. So people who install solar systems, sometimes at my (the public) expense, can not assign the output to their electric vehicle. No matter what, these are independent actions, so the owner of the solar array has a choice whether to sell the solar output to the grid. If that is the sensible economic option, then it would make no sense to force the output to go to the EV --even though it might sound cute.
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