On Friday, Nov 21, 2003, at 16:54 US/Pacific, Kyrre Aalerud wrote

> wanna boost voltage from 12v to 24v when charging up to 12 cells, but
> boost
> it to maby 48v when charging more cells.  For 6 cells and under, I
> won't
> need to boost at all.

> Problem is how to do this at high enough current?  I would be
> satisfied with
> maby 2-3 amps, but would love up to 5 amps....

You do realize that to get 48V at 5A from 12V, your "primary side" will
need to draw an average in excess of 20A?  And if you're using some
sort of switched supply, the primary switch and inductor currents will
be significantly higher than that?  I guess you're working from a car
battery, so you'll have the current available, but I think you're
looking at a very non-trivial design.  Don't melt your wires...

BillW

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