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        Question Simultaneously charging series packs with two chargers

#1 kkant Feb 23, 2009 09:34 PM

Simultaneously charging series packs with two chargers
 
I have two lipo packs hooked up in series, and I'd like to avoid having to disconnect them from each other when charging. Can I charge them separately with two lipo chargers, when both chargers are using the same power source? How about if the 12V sources are isolated? My chargers are Hyperion EOS610i's. Here is a pic to describe what I am trying to do:

http://img25.imageshack.us/img25/7097/multicharger.png

#2 rebell Feb 23, 2009 10:59 PM

Yes, you indicate the problem yourself.

Lots of info on series and parallel charing here: http://www.rcgroups.com/forums/showthread.php?t=932319

#3 kkant Feb 24, 2009 08:26 AM

Will it work if I isolate the 12V power supplies, i.e. have two separate 12V batteries with isolated grounds?

BTW I did look at that thread in my searches, very informative. But in this case, simultaneous parallel charging won't work, since I'd have to disconnect the series connection anyway. Simultaneous series charging might work, if I made adapter cables for the taps (no big deal) and could find a 10A charger with a true 300W output (seems unlikely).

#4 coro Feb 24, 2009 09:13 AM

Yes isolated power supplies will work, e.g. two lead acid batteries.. Be careful before trying two mains power supplies, first check whether they are not connecting output to mains ground or induce some voltage against ground. It may act as a common ground of them, killing the charger(s).
It would be much easier, if You split the pack into two separate 6s parts.

#5 kkant Feb 25, 2009 11:01 AM

Sounds good. Thanks for the info.


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