DIY charger

[vwdevotee]

I'm on sabbatical for a little while, and I'd like to build my own "smart" charger for my future EV. I know I could just buy one a lot easier, but where's the fun in that? Anyway, does anyone know of a good discussion of high voltage (96-144V probably) battery charger design? All of the discussion I've found in the past few days of looking has been for single cell chargers or a few cells at most. Thanks for the leads!!!

 

[neobeam]

i have been using an old "tungar"-style trick,and using a common rectifier,and incandescent lamp -
for the charging of a set of 72v sla...(i may publish the
drawing and ,outline the technique at some time).
this has risks,as the ground may be connected through on other circuits....
however if manually monitored,it can provide very good results.
i will be switching to a 96v system (using"headway 48 v packs") and attempting to
set up a similar rig,but i neeed to automate the controlled "applied voltage" and timing.
it will no doubt involve a few simple timers and threshold detectors,with perhaps relays ,or ssr.
if this has been done ,i would like to hear of the experiences of others.
as far as safety goes ,an isolation transformer ,can make the system float off the ground return,and offer no
loop to get dangerous,or even wasted power.

 

[stator]

DIY Open Source EV Charger

http://ecomodder.com/forum/showthread.php/diy-open-source-ev-charger-6795.html

 

[vwdevotee]

I was just doodling to think my way through a PIC controlled charger and this is what I have thus far. Any thoughts? I figure the charging algorithm should be pretty simple to implement in software. I'll read through the thread you posted. Thanks!!!