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

[James Oddino]

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
>
> 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.
>>
>> 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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