Quote:
Originally Posted by JSH
Capacitors are good for that usage but the problem is that only allows for start / stop function. It doesn't have enough energy storage to provide a boost for acceleration or run HVAC while the vehicle is stopped. Customers hate that type of system and often turn them off. (Nothing like sitting at a light on a nice hot and muggy Alabama day and having the HVAC blow hot air at you.)
(The EPA requires a stop / start system provide 1 minute of heat on a 30F day. There is no requirement to provide A/C with engine off.)
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If the industry standardized on 48v, it would probably make a mild hybrid stop/start system fairly trivial. Keeping the Ah the same and boosting the voltage would provide 4x the energy available; allowing acceleration assistance and running accessories while the engine is off.
Vehicle wiring gauge could be downsized too saving cost. Finally, since it would still be considered "low voltage", it would still be safe for the typical person to be around.