Re: javi's battery project

Hi William,


> As long as I am here, let me embarrass myself further-- why does
> your management care exactly which cell is defective?  Do they have
> a plan to try and correct the cell, in-place (in-circuit)?  If not,
> seems like a simple voltage divider across the entire 48V stack 
> would be good enough for a good/bad indicator...

  These batteries must supply between the mains AC fault (usually 
outside high voltage) and the diessel engine start-up. If one cell is 
fault, the second battery unit will be powering this cell instead of 
powering the telephony systems. These cells (like those we have 
inside our cars) don't live forever; the purpose is to have a record 
of each one and see when becomes to die, changeing by anoter new one.

   As I mentioned previously, the requirements are to measure each 
cell alone, not 2 or 3 and make the diff. At first I think in 
multiplexers, but I didn't find an affordable solution; so I took the 
easy way making a 24 relays driven by sipo shift registers. The 
system seems to work :), and the thread is/was how to do it better 
without 24 relays (being competitive in price).


[PS] Don't forget your vote.  ;)


Regards
Javi.
www.japus.org