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Originally Posted by fernando_g
Bob;in your very comprehensive list, you forgot something crucial: what type of batteries to use.
This is no trivial matter. The least expensive would of course be the flooded lead-acid. It would be the heaviest pack by far, specially if one uses one of those deep-discharge batteries. A "standard" lead-acid would have a very short life as a traction battery.
That would leave you with either NiMh or Li-ions. Quite expensive, but most importantly, they require a sophisticated charging algorithm, temperature sensing and ensuring that the charge balance across the cells remains within certain tight limits.
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I had left the batteries out because I would use a step-up inverter to convert the 48 VDC to the voltage and frequencies needed by the various MGs. By standardizing on a 48 VDC power bus, a lot of safety issues are resolved as well as off-the-shelf battery systems. The US phone system is based upon 48 VDC battery systems for power during an outage.
I have assumed the battery subsystems would be ECU controlled. Other than a "state of charge" to the vehicle controller, "about to isolate" signal and sense "regenerative recharge" signal, they would be self contained assemblies that could operate in parallel. The vehicle doesn't care what battery chemistries are used to provide motive power.
IMHO, a low performance, low cost lead-acid battery system might be in the starter car. Later it could be augmented and/or replaced by one or more advance chemistry battery assemblies.
Bob Wilson