Originally Posted by gottdi
We are talking FAST DC to DC charging or at lest I am. ...what I am talking about is direct DC power to Battery and controlled for your battery type.
Fast High Amperage charging. Like charging in 20 minutes sort of charging with no wall power.
hhhmmmm, you mean like if you had a 'slow-charged' pack of 44 cells sitting ready, with nominal voltage in use at 44*3.2= 140.8v and hooked directly to your depleted pack of 38 cells, where the desired 'finish voltage' is 140.8/38= 3.71v.... then you'd get a very fast charge, wouldn't you? And it would basically be in CV mode and 'finish' without any hardware/software as the smaller pack approaches its finish voltage at the larger pack's nominal operating voltage.
essentially using a slow charged pack as a reservoir capable of a quick dump of energy..... All you'd need would be a monster contactor that wouldn't weld itself on initial contact.