[NSRCA-discussion] Main battery redundant lead for receiver

Tue Jan 24 07:25:07 AKST 2012

Keith,
    Or you could continue to support people that support us like Chris!
FINALLY, I get a chance to get a dig on you.  Go home and play with some
more electricity buddy!  ;)

On Tue, Jan 24, 2012 at 10:22 AM, Keith Hoard <khoard at gmail.com> wrote:

> Or you can order them here for $0.23 each.
>
>
> http://search.digikey.com/us/en/products/B6B-XH-A%28LF%29%28SN%29%3B/455-2271-ND/1000381
>
> Better hurry while supplies last, they only have 24,660 left.
>
>
> Keith Hoard
> Collierville, TN
> khoard at gmail.com
>
>
>
>
> On Tue, Jan 24, 2012 at 10:17 AM, Anthony Romano <anthonyr105 at hotmail.com>wrote:
>
>>  Thanks everyone. So I will pick up another regulator from Ed and a
>> JST-Xh connector from Chris. Power pack will be the main @ 6.3v and back up
>> will be a 350mah 2s pack @ 6.0v. This wil allow me to add redunancy and
>> cut a few grams.
>>
>> Anthony
>>
>>  ------------------------------
>> Date: Tue, 24 Jan 2012 10:01:34 -0600
>> From: khoard at gmail.com
>> To: nsrca-discussion at lists.nsrca.org
>> Subject: Re: [NSRCA-discussion] Main battery redundant lead for receiver
>>
>> Anthony,
>>
>>    On a typical flight, I'm guessing the radio only uses around
>> 100-150Mah of power, while the motor is using 4000Mah, so that's about 4%
>> more draw on those two cells.  In practice, I haven't been able to see any
>> difference in the radio cells when I hook them up to my charger at the end
>> of a flight.  Sometimes cells #1 & #2 are the high cells after a flight, so
>> I think the power draw of the radio is negligible to our motor packs.
>>
>> The problem with two regulators plugged into the same 10S (or 5S) pack is
>> that you are creating a dead short between the cells thru the ground wires
>> (typically a straight wire thru the regulator).
>>
>> Say you plug Regulator #1 into cells #1&2, and Regulator #2 into cells
>> #6&7.  The regulator's *ground *wires now have 5 cells of voltage
>> potential (5 X 4.2V = 21Volts) between them since they are plugged into
>> cells # 1 and #6.  When those two ground wires are then plugged into your
>> receiver either thru a switch or direct connection the magic smoke will
>> escape and your retailer will rejoice.
>>
>> Also, if you have both of your regulators plugged into your motor pack
>> and the packs eject like Goose in Top Gun, you've lost both of your
>> redundant power sources.  However, if you use a tiny 2S LiPo that is
>> physically separated and secured inside your plane, you have both
>> electrical and physical redundancy.
>>
>> Hmmm, just thought of something . . . maybe we should tie down the
>> receiver so the main regulator can't take the receiver out with it. . . so
>> many contingencies, so little weight . . .
>>
>> Keith Hoard
>> Collierville, TN
>> khoard at gmail.com
>>
>>
>>
>>
>> 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*
>>
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-- 
*Scott A. McHarg*
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