[Giant Scale Aerobatics] Fw: Parallel charging
JOddino
JOddino at socal.rr.com
Sat May 8 12:51:40 AKDT 2004
Yes, the black wire from each pack is carried through the switch harness
even when the switch is off, so if you have two packs connected to the
receiver their negative terminals are connected together even with the
Duralite Plus packs.
You didn't say that your experience included this configuration. If you
never charged two packs simultaneously while connected to your receiver I
wouldn't expect you to have a problem.
Jim
----- Original Message -----
From: "Perry Genovese" <pgenoves at bellsouth.net>
To: <gsal at yahoogroups.com>; <discussion at nsrca.org>
Sent: Saturday, May 08, 2004 12:33 PM
Subject: Re: [Giant Scale Aerobatics] Fw: Parallel charging
> I have not experienced this problem in the past with any type of pack.
>
> More recently the Duralite Plus packs I use though have a separate
charging lead required so each pack is direct to the charger through its own
circuitry. I've always enjoyed the simplistic safe approach Duralite uses.
>
> However though, regardless of pack type, if you have 2 switches, 1 each
into the receiver, and a pack connected to each switch are you saying that
they still share the receiver ground on the pack side of the switch with
each switch off?
>
> Perry
> ----- Original Message -----
> From: JOddino
> To: gsal at yahoogroups.com ; discussion at nsrca.org
> Sent: Saturday, May 08, 2004 2:20 PM
> Subject: Re: [Giant Scale Aerobatics] Fw: Parallel charging
>
>
> Thanks for responding. I'd like to hear from anyone else who has
> experienced this problem. I'm amazed that we haven't seen more of
these.
> Regards, Jim
> ----- Original Message -----
> From: "Jean-Yves Falardeau" <jyfalardeau at sympatico.ca>
> To: <gsal at yahoogroups.com>; <discussion at nsrca.org>
> Sent: Saturday, May 08, 2004 9:48 AM
> Subject: Re: [Giant Scale Aerobatics] Fw: Parallel charging
>
>
> > i have been experimenting the samething last year and the conclusion i
> made
> > was that ,as you mention, if the batteries are pluged in the receiver
> while
> > being charged will affect any peak charger for any type of batteries
> because
> > they have a common ground thrue the receiver busbar. this will for
sure
> > change the peak value and will cause the chargers( i use two charger)
to
> > quit at the wrong time and you will think that they are full charge
and in
> > reality they are not. i have had batterie pack that almost cought on
fire
> > because the charger would charge to a higher voltage than the batt
would
> > require also. this situation could be very dangerous if the airplane
is
> left
> > without watching for a period of time.
> > for conclusion i always disconnect at least one pack from the system
and
> > since i never had any problem.
> > ----- Original Message -----
> > From: "JOddino" <joddino at socal.rr.com>
> > To: <gsal at yahoogroups.com>; <discussion at nsrca.org>
> > Sent: Saturday, May 08, 2004 11:10 AM
> > Subject: [Giant Scale Aerobatics] Fw: Parallel charging
> >
> >
> > > A warning to all:
> > > Here is a real potential problem. We are talking about NiCd and
NiMH
> > charging. Recently two guys have burned up packs in their planes. I
get
> > called because they think it was caused by my switch harnesses. I got
> > suspicious when I found out both were using parallel packs and switch
> > harnesses. I remember when Chip Hyde first started using the original
> > Duralites in parallel he found he could not charge both at the same
time
> if
> > they were both plugged into the receiver. We found it was due to the
> > sensing resistors in the return wires from the batteries being
charged,
> > being short circuited by the connection in the receiver. This
confuses
> the
> > charger. I wasn't sure if the Schulze and the other sophisticated
> chargers
> > used low side current sensing so I asked. I didn't get a perfectly
clear
> > answer but you can see the German approach.
> > > If you don't know if your charger has this potential problem don't
> charge
> > simultaneously unless you unplug one from the receiver.
> > > For those of you following the discussion of the NMP Li-Ion charger,
it
> > does not have low side current sensing, it has a meter in the high
side,
> and
> > it is perfectly okay to charge in parallel simultaneously in the
plane.
> > > Jim
> > > ----- Original Message -----
> > > From: hotline at schulze-elektronik-gmbh.de
> > > To: JOddino at socal.rr.com
> > > Sent: Saturday, May 08, 2004 4:00 AM
> > > Subject: Re: Parallel charging
> > >
> > >
> > > you ALWAYS have to charge batteries directly and all alone connected
to
> > the charger.
> > >
> > >
> > > Best regards
> > > Matthias Schulze
> > >
> > > Schulze Elektronik GmbH
> > > Prenzlauer Weg 6
> > > 64331 Weiterstadt
> > > Germany
> > >
> > > Fon: +49-6150-1306-5 (sales + answering machine)
> > > Fon: +49-6150-1306-98 (hotline daily 14:00-16:00 local time CET)
> > > Fax: +49-6150-1306-99
> > >
> > > eMail: sales at schulze-elektronik-gmbh.com for your order(s)
> > > eMail: hotline at schulze-elektronik-gmbh.com for technical support
> > > Homepage: http://www.schulze-elektronik-gmbh.com
> > >
> > >
> > > Original Message processed by Tobit InfoCenter
> > > Subject: Parallel charging (07-Mai-2004 4:24)
> > > From: JOddino at socal.rr.com
> > > To: hotline at schulze-elektronik-gmbh.com
> > >
> > >
> > > Is it possible that the charger gets confused if two batteries are
> being
> > charged simultaneously with two chargers and the batteries being
charged
> > have their returns connected as they are when they are plugged into a
> single
> > receiver through typical R/C switches?
> > >
> > > Is there some type of current sensing in the return line that
would
> not
> > function properly with two in parallel?
> > >
> > > Thanks in advance.
> > > Jim Oddino
> > >
> > > [Non-text portions of this message have been removed]
> > >
> > >
> > >
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