[NSRCA-discussion] Main battery redundant lead for receiver

[Dave Lockhart]

The F3A adapter Scott mentioned pulls 2 cell voltage from the 5s adapter.
That 2s voltage is then run to a (backup) voltage regulator.  Backup Vreg
meaning it is set at a lower voltage than the primary Vreg output, and would
only supply current to the RX if the primary output dropped to below the
backup voltage.

 

Switching regulators in parallel are not a good idea whether powered by a
single battery, separate batteries, or "tapped" with an adapter from a motor
battery.

 

The F3A adapter essentially allows a redundant power pathway (if a 2nd Vreg
is used with it) without a 2nd RX battery.

 

Regards,

 

Dave Lockhart

 

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Peter Vogel
Sent: Monday, January 23, 2012 5:50 PM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Main battery redundant lead for receiver

 

And, of course, with a non-switching BEC off a 10s or even a 5s pack you
would have massive heat issues as it tries to step down the voltage from
18.5 volts to 7.2 or 6 volts, depending on whether you are running an HV or
standard voltage setup, so the regulator would probably need a fan or heat
sink of some sort, which likely negates any weight savings from not running
with a second battery.

 

Peter+

On Mon, Jan 23, 2012 at 2:30 PM, Scott McHarg <scmcharg at gmail.com> wrote:

You have to be careful using the BEC, especially from CC because it is a
switching regulator which cannot be run in parallel.  It's really best not
to use the BEC and set up a truly separate system.

Scott

 

On Mon, Jan 23, 2012 at 4:28 PM, George Kennie <geobet4evr at gmail.com> wrote:

Could a CC BEC also be used instead of a reg.? I don't know how much curent
is passed by a reg. 

Sounds good cause it's a bummer trying to solder an extra lead to the Deans.

 

G.

On Mon, Jan 23, 2012 at 5:09 PM, Scott McHarg <scmcharg at gmail.com> 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





-- 
Scott A. McHarg


_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion





 

-- 

Director, Fixed Wing Flight Training

Santa Clara County Model Aircraft Skypark

  <http://farm8.staticflickr.com/7163/6513778381_5569cc985d_m.jpg> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20120123/e53f5995/attachment.html>