So, a long term goal of my off grid solar project is DC->DC charging for my Model S. Should be more efficient, should be able to do at least the same power level at the HPWC, or even twice as much. Since the CHAdeMO protocol appears to be more readily available than Tesla's Supercharger protocol, using the adapter plus a custom made CHAdeMO station would seem to make sense. I found one company that sells the charging station plug... and they want $1500 for just the plug, which is pretty steep for just the plug, IMO. It would probably be better, for my purposes, to gut a Tesla CHAdeMO adapter and not actually use the CHAdeMO plug. The power conversion side of things probably wouldn't be cheap either, especially with my setup where I would need to bump ~48VDC to ~400VDC with regulated voltage and current. To do 40kW that'd be ~830+A power draw on the input side, and 100+A output on the output side, and I envision many large HV capacitors and copper bus bars... so, not cheap either. Feeding directly from high voltage PV would likely be more ideal. I'm guessing that for the moment this is probably out of reach of my DIY skills, but probably possible long term when/if some more DC charging standards work with the Model S. When Tesla is done with their CHAdeMO adapter backlog, I'll probably buy a second one to gut and see what I can do, even if it is a low current demo.