[NSRCA-discussion] Main battery redundant lead for receiver

[Keith Hoard]

Peter,

  You will still want to use a regulator since the ESC is causing the voltage to fluctuate (Castle calls it "Voltage Ripple") while running. The regulator chops off the voltage below where the volts are rippling. . . 
.
And that's your technical 'esplanation of the day. 

Keith Hoard
Collierville, TN

On Jan 23, 2012, at 16:56, Peter Vogel <vogel.peter at gmail.com> wrote:

> Ah.  Now that's a good idea + point.  And then, in my case, where I'm running HV, I don't even need a reg.  That would provide true power redundancy for almost no weight penalty, though it does run the risk of yanking your RX out if your main battery ejects, or, even if it doesn't yank the Rx (which is held in by 6 servo leads after all, it could yank the redundant battery lead loose and the main system battery is of course yanking itself, so you are left with no radio...
> 
> Scott, how do you come up with 20g savings?  What size Rx battery are you running?  My TP 1350's weigh 76g, even 900's are in the 60+g range.
> 
> Peter+
> 
> On Mon, Jan 23, 2012 at 2:51 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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>> -- 
>> Scott A. McHarg
>> 
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>> -- 
>> Director, Fixed Wing Flight Training
>> Santa Clara County Model Aircraft Skypark
>> 
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