any merit in running dual battery packs ?

[Dwayne & Nancy]

Jim Oddino makes a very good failsafe switch.  Contact him via list.
Dwayne
 
-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Bärtschiger Urs
Sent: Saturday, January 29, 2005 5:13 AM
To: discussion at nsrca.org
Subject: Re: any merit in running dual battery packs ?
 
Hi Jim,
 
Fully agree with your statements. 
Questions: 
- Which capacity Li-Ion battery are you recommending for a pattern plane
equipped with digitals?
- Which solid state failsafe voltage regulator switch harness do you
consider suitable?
 
Thanks for your comments.
 
Urs 
NSRCA # 3069
 
----- Original Message ----- 
From: J.Oddino <mailto:joddino at socal.rr.com>  
To: discussion at nsrca.org 
Sent: Friday, January 28, 2005 8:14 PM
Subject: Re: any merit in running dual battery packs ?
 
Two packs and two switch harnesses are good from the standpoint of
eliminating single point failures and they would minimize voltage drops
between the battery and receiver buss as the current in each would be
cut in half thereby reducing the voltage drop by a factor of two.  The
down side is the added weight and cost.  I'm using two in my third scale
plane but have stuck with single packs in my pattern size planes.  If
you go with one battery and one switch I'd recommend a solid state
failsafe voltage regulator type switch harness and a Li-Ion pack.  The
higher capacity of Li-Ion takes care of the added current we see with
the digitals and the higher voltage allows better regulation at a higher
voltage resulting in more servo torque and speed (more power).  With the
voltage regulator you don't need to worry about voltage drops between
the battery and the buss.
Jim
----- Original Message ----- 
From: Hitesh Gajjar <mailto:hitesh at salt.ac.za>  
To: discussion at nsrca.org 
Sent: Monday, January 24, 2005 4:13 AM
Subject: any merit in running dual battery packs ?
 
Hi,
 
Now that we all using high powered digital servo's with incredible
holding power etc - is there any merit in running 2 battery packs, say 1
Ah each as opposed to 1 high capacity pack thereby eliminating the
single point failure ? If I did want to run 2 packs, is a diode
necessary to prevent 1 pack from possibly charging the other if 1 pack
were to go bad ?
 
Cheers,
Hitesh
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