I don't have a Volt but, as an EE, I see that a second charger will not work because the onboard battery monitor communicates with the EVSE to determine the charging current. 3.3 kW is about 15 A for a Level 2 EVSE and that is set at the code level. A second charger, if setup to supply the same charge current of 15 A (for a possible total of 30 A), will be working against the first EVSE. The monitor circuit will detect the higher current and tell the EVSE to drop the current, so at the end, the two EVSE and chargers will reduce their outputs to be just 15 A together (or 7.5 A each).
Someone has to break into the Volt battery monitor code to allow higher currents to charge the battery. And someone here mentioned that the regenerative braking does supply higher currents, but that is from the motor/generator. If there were a way to "spoof" the monitor to believe that the Volt is in regeneration, maybe the higher charge current can be possible.
I once thought of a third path: a direct battery attachment, bypassing the internal monitor. But that is dangerous if the new external monitor cannot measure the exact current entering the battery and its thermal conitions. This is all dangerous due to the high amounts of energy involved. No layperson, or even an EE with little knowledge or training, can do any type of external modification to increase the Volt battery charging input over the coded 3.3 kW without getting some information or help from LG Chamical of any specialized GM engineer. The gain cannot compensate the risks involved.
Last edited by Raymondjram; 03-19-2017 at 10:37 PM.
No Volt or Bolt EV yet!
2009 Chevrolet Equinox 2LT
Level 2 JuiceBox EVSE installed at 7.2 kW
Registered EVSE at PlugShare
Waiting for the first EV to charge!