[NSRCA-discussion] Main battery redundant lead for receiver

[Peter Vogel]

Yeah, I actually do that with my TX lipo conversion, the 3s lipo balance
taps run to a diode that drops the voltage by 1.5 volts, so the fully
charged 12.6 volt lipo appears as a 11.1 volt source (fully charged 8 cell
NiMH equivalent) to the radio, and when the radio's low battery alarm goes
off I'm left with an 80% discharged LiPo, perfect.  I hadn't thought to do
it with a main battery.

Peter+

On Mon, Jan 23, 2012 at 2:56 PM, Scott McHarg <scmcharg at gmail.com> wrote:

> Peter,
>    Keith is correct.  You only tap off two of the cells, not all 5.  You
> are only regulating 7.4 V (8.4V charged).
>
> Scott
>
> On Mon, Jan 23, 2012 at 4:51 PM, Keith Hoard <khoard at gmail.com> wrote:
>
>> Only tap off two cells of your main pack. You can then use a regular
>> regulator (as opposed to a non-regular regulator).
>>
>> Keith Hoard
>> Collierville, TN
>>
>> On Jan 23, 2012, at 16:49, Peter Vogel <vogel.peter at gmail.com> wrote:
>>
>> 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
>>
>>
>>  _______________________________________________
>> 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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20120123/c9d6ed6a/attachment.html>