Any attempt to do a DC charge of the Volt's battery can void its 8-year warranty. So, for anyone who wishes to experiment with DC charging, get a salvaged Volt which lost its warranty to work with. Up to now, I see the first Dc opportunity at the output of the onboard 3.3 (or 3.6) kW AC charger as a test point for DC input, bypassing that charger. If the battery is monitored, maybe it can accept over 7 kW of a DC charge at that point. Since I have no Volt, I am guessing here. And maybe another point would be where the A/C compressor gets its power from the battery. I doubt there can be any free point to do a DC charge other than those two.