also the actual amount may vary based on voltage

watts = volts * amps

208 volts * 32 amps = 6,400 watts

220 volts * 32 amps = 7,040 watts

240 volts * 32 amps = 7,680 watts

250 volts * 32 amps = 8,000 watts

so depending on time of day and the actual volts your service provider is giving you a 32 amp charge rate can vary from 6,400 watts to 7,680 watts

also voltage drops as a function of distance of the wire you're using - so while you may be 242 volts at your main electrical box, if your garage is far away from the main box the wire distance may drop the voltage to say 232 volts…

if you're in the 6,000 - 7,000 watt range you're charging at 32 amps

the basic AMPs I've seen from chargers fit into neat/tidy categories - see even though it is possible for an EV to charge at 17 amps - typically you will seeing the following EVSE setups

8 amps EVSE L1 charging (15 amp circuit) - 960 watts

12 amps EVSE L1 charging (15 amp circuit) - 1,440 watts

12 amps EVSE charging (16 amp circuit) 2,880 watts

16 amps EVSE charging (20 amp circuit) 3,840 watts

24 amps EVSE charging (30 amp circuit) 5,760 watts

30 amps @ 208 volts - Commercial/Public J-1772 chargers (typical charge point for example) - 6,240 watts

32 amps EVSE charging (40 amp circuit) 7,680 watts

40 amps EVSE charging (50 amp circuit) 9,600 watts - not for Bolt - Bolt is limited to 32 amps - Boll will charge, but only at 32 amps

48 amps EVSE charging (60 amp circuit) 11,520 watts - not for Bolt - Bolt is limited to 32 amps - Boll will charge, but only at 32 amps

the following forum postings have most of the information you're looking for

http://www.chevybolt.org/forum/82-charging-batteries/16738-charging-table.html
http://www.chevybolt.org/forum/82-charging-batteries/7186-charger-math-skip-post-if-you-know-already.html#post76418