[NSRCA-discussion] Main battery redundant lead for receiver

[Scott McHarg]

Anthony,
   The draw for a pattern plane for the receivers per flight is between
25-50 mah typically.  The cells do come out of balance but they also
typically will easily have that much variation in them in a normal flight
as each cell will not have exactly the same discharge rate.  When you
charge your pack after the flight, the charging process will balance them
out.  It also depends on how you set up your redundant system.  If you set
the voltage regulator from your main pack to be your "back up" by setting a
lower voltage than the primary pack, you won't use your main battery unless
something goes wrong with the primary pack.  If you set the voltage
regulator on the main pack to be the same as your regulator, you will be
running a dual system which means (ideally) the rx will take power from
both main battery and primary and you can reduce the draw on the pack by
1/2 of the normal mah used.  If you set your main battery regulator higher
than the primary pack, the main battery then becomes your primary and your
small rx pack does not get used unless something happens to the main
battery.
   As Dave stated, you should not run switching regulators parallel but
standard regulators such as the Tech-Aero and Smart-Fly as well as others
is not a problem.

Scott

On Tue, Jan 24, 2012 at 8:15 AM, Anthony Romano <anthonyr105 at hotmail.com>wrote:

>  Seems like a great idea but I have two questions. Do the packs come down
> out of balance since two cells are serving extra load? Is there a problem
> with parallel operation of two regulators?
>
> Thanks,
>
> Anthony
>
>  ------------------------------
> From: joddino at socal.rr.com
> Date: Mon, 23 Jan 2012 15:25:00 -0800
> To: nsrca-discussion at lists.nsrca.org
> Subject: Re: [NSRCA-discussion] Main battery redundant lead for receiver
>
> I've been using this setup for sometime and it is working great.  I have
> my two cell LiPo charged to 7.5 volts and it is connected to a 6.0 volt
> regulator into the receiver.  The cable connected to the balance connector
> on the "bottom" 5S is connected to a 6.3 volt regulator so it supplies all
> the current to the system and the 2S pack never needs charging.  I'm using
> an 800 mAh pack but it could be even smaller.
>
> Jim O
>
>
>  On Jan 23, 2012, at 2:09 PM, Scott McHarg wrote:
>
> Guys,
>    Chris Moon just e-mailed me about some leads that were done at the
> factory.  These leads run off your balance leads to a voltage regulator and
> allow your main battery pack to be utilized as a redundant receiver
> battery.  It is NOT meant to be a primary but it will save 20+ grams if
> you're running 2 rx batteries.  You still have to run the 2nd regulator for
> true redundancy but you eliminate the 2nd battery.  These leads are factory
> made and eliminate the need to make them yourself with the concern about
> plugging in to the wrong cell.  I know in my article, I was pretty much
> against doing this as a backup but, with Chris having this made at the
> factory, he has all but eliminated making a mistake by tying to the wrong
> cell.  I have the link that I'll e-mail you off-list or you can just go to
> his website.  I don't want to break the NSRCA list rules by advertising for
> him even though he advertises with the NSRCA.  The leads are only $3.99
> each and are found under the Connectors/Adapters listing.
>
> Thank,
> Scott
>
> --
> *Scott A. McHarg*
>
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>
>
>
> _______________________________________________ NSRCA-discussion mailing
> list NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>



-- 
*Scott A. McHarg*
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20120124/32f0a2ec/attachment.html>