[NSRCA-discussion] FW: ESVs for flight pack lipos?

[Keith Black]

Jim, cool idea, maybe you can build into it the capacitor idea you had a while back to stop that nasty POP when we plug in.

Keith
  ----- Original Message ----- 
  From: James Oddino 
  To: General pattern discussion 
  Sent: Friday, August 29, 2008 11:22 AM
  Subject: Re: [NSRCA-discussion] FW: ESVs for flight pack lipos?


  Hi Gordon,


  I suspected that.  I was thinking of building a gadget that lit up an LED if the voltage was over 41 or so.  It could be very inexpensive and could save a set of expensive batteries.  I have seen more than one guy take off with batteries they thought they had charged.  They found out only when the voltage had dropped too low.  I almost did it once but I had an Eagle Tree TM system and checked the voltage before I took off.  I don't always use the ET so it would be nice to have another painless way to know the packs are charged.


  Jim 




  On Aug 29, 2008, at 6:16 AM, Gordon Anderson wrote:


    Jim,

    The maestro will not accept a 42 volt input. It was designed as a flight pack testing system and includes a programmable battery load. It will calculate and display the packs internal resistance as well. 

    --Gordon



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    From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of James Oddino
    Sent: Thursday, August 28, 2008 4:18 PM
    To: General pattern discussion
    Subject: Re: [NSRCA-discussion] FW: ESVs for flight pack lipos?


    What is the voltage range?  I'd like to have a unit that would stay in the plane and tell me that my 42 volt battery is charged when I plug it in. 


    Jim




    On Aug 28, 2008, at 3:42 PM, Derek Koopowitz wrote:


      I bought mine from Gordon Anderson...

      http://www.mstar2k.com/

      Look for the Maestro on his page.



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      From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Richard Strickland
      Sent: Thursday, August 28, 2008 11:36 AM
      To: NSRCA DISCUSSION
      Subject: [NSRCA-discussion] FW: ESVs for flight pack lipos?



      I'm switching some of my stuff to 2 cell lipos into a regulator (learned the hard way that you separate the regulator on the OTHER side of the switch from the battery--but that's another story).
      The question(s): What is a good, relatively small ESV that has a load to check the lipos? What voltage do you let them get down to before no go?
      My 30 year old SO (Ye Olde ESV) ranges just miss that middle ground. I've got a voltmeter--but it's not loaded.  On a 1200 pack(still lighter than 4 nicads WITH reg.) on four flights, the drop was from 8.4 down to 8.25V.  I'm going to a 780 on another airplane and my understanding guys are getting up to 7-8 flights on that size pack.  But how do you check them?
       
      Thanks,
       
      Richard


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