The car uses about a kilowatt hour of battery as working buffer for the engine, and at the start of your time at the light you'll likely be near the top of that. I don't think it'll let you spend the whole thing on A/C, since that would mean poor acceleration, but I think it does allow ~300 Wh before cycling. That's around 3 minutes of 6 kW full load initial cooling the car on a really hot day, or close to twenty minutes of 1 kW keeping the car cool in typical summer conditions.
AC on Battery
So I'm at the dealer today in the hope they will update the backfire issue. The SA said it takes a long time (to hook the thing to a computer and walk away???). Anyway, I drained the battery so if they had to go for a joy ride they could experience the issue quickly. I got to wondering with my drained battery about how long the AC would run on almost no battery while sitting at a traffic light. I know a lot of start/stop cars will start the engine after a minute or so sitting with the AC on. So how long will the Volt be able to run the AC at a light if there is effectively no battery left before it starts the engine?
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