[jray3]

WindyDrew, I don't see any report on which Level 1 EVSE you are using. The Volt has come with a few, as I hear. One defaults to 8 amps unless you select 12 amps every time, one was recalled due to 16 gauge wires that tended to overheat, and all of the Voltec EVSE seem to have had high failure rates compared to the Panasonic units supplied by Nissan and Mitsubishi.

Since you said that 8 hrs at work isn't enough to completely recharge, I'd focus on fixing that and make sure you're using a 12 amp EVSE (on a standard 15 amp outlet). 12 amps would be plenty to refill the Volt's 10.4 useable kWh, but if you have access to a 20 amp 120V outlet, you could go all the way up to a 16 amp L1 EVSE, which should recharge the car within six hours. I've used the dual voltage SPX/Bosch Power Express since 2011 due to its user-adjustable settings, but there are better options out there now for an adjustable L1 EVSE.
(The SPX design put the amperage trim pot within a bumper that collects water and kills the unit if you leave it sitting on its back in the rain...)