[NSRCA-discussion] Main battery redundant lead for receiver

[Scott McHarg]

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*
>>>>
>>>>
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>>>>
>>>
>>>
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>>
>>
>>
>> --
>> *Scott A. McHarg*
>>
>>
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>
>
>
> --
> Director, Fixed Wing Flight Training
> Santa Clara County Model Aircraft Skypark
>
>
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-- 
*Scott A. McHarg*
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