[NSRCA-discussion] Main battery redundant lead for receiver

[John Gayer]

I would like to emphasize that the pigtail from Chris Moon could 
physically  be plugged into either of the 5s balance connectors which 
Jim identifies as the "bottom" connector. If your esc is not fully 
optically isolated on the ground leg and you plug into the "upper" 
battery, there will be smoke. If there is a BEC in your ESC, there will 
NOT be isolation. In that case, I suggest that you tag or use nail 
polish to identify the correct balance connector on each pack as you 
will be plugging into this balance connector whenever you change 
batteries. It is also a good idea to use a switch for each power lag and 
check each leg for power separately as part of your pre-flight process. 
It is easy to forget plugging in the balance connector when you start 
using this system plus it is important to confirm that both legs are 
working before each and every flight. Otherwise you can lose your 
redundancy before the flight even begins.
The Castle HV series without BEC allows you to use either balance 
connector without any issues.

John

On 1/23/2012 4:25 PM, James Oddino wrote:
> 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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>
>
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