Here's a more detailed discription from the First Responders Guide for the NAH about the electrics:
The Low voltage system:
A 12 volt DC negative chassis ground body electrical system
The High voltage system:
A 245 volt DC high voltage battery
A harness that carries high voltage between the high voltage battery, converter, inverter unit, transaxle and electric air conditioning compressor
A converter which converts 245 volts DC to 42 volts DC for the electric power steering (EPS) system
A converter which converts 245 volts DC for charging the 12 volt battery
An inverter unit which delivers up to 650 volts AC to the transaxle
A transaxle which houses a traction motor and generator
A 245 volt DC, electric motor driven electric air conditioning compressor