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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> Dual batteries for redundancy
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Dual batteries for redundancy - 8/9/2003 7:16:32 AM   
-JC-



Posts: 1521
Joined: 12/10/2001
From: Pacific Palisades, CA, USA
Status: offline 		Question:

If I want to have dual batteries and dual switches on my plane, and not having to add all kinds of regulators and electronic gizmos, can I do that?

One battery will be plugged into the battery slot, and the other battery into an aux channel.

Both batteries are 4.8V 2000 MaH

Anyone done this?

Thx

_____________________________

John C
       Post #: 1

Dual batteries for redundancy - 8/9/2003 7:23:00 AM   
Heavybird



Posts: 94
Joined: 6/6/2002
From: Nashville, TN, USA
Status: offline 		JChris,

Works great, I use three batteries with one plugged into into the landing gear....just kidding. Thats a good question as I was wondering the same thing.

Jake

_____________________________

Airspeed Altitude? we don't need no stinking Airspeed and altitude

(in reply to -JC-)
       Post #: 2

REDUNDANCY - 8/9/2003 7:44:07 AM   
Flying Geezer



Posts: 1024
Joined: 4/12/2003
From: Bowling Green, KY, USA
Status: offline 		That's the way I have done it for years. There's almost nothing to go wrong.

TIP: Before you do your range check. Turn one switch on. Check to see that your surfaces move. Turn that switch off and check the other. That way you'll know that both packs are connected and charged.

If you don't check this regularly, one source could go bad, (bad switch, broken lead, etc.), and you'll never know it.

_____________________________

Flying Geezer
Hughes RC

(in reply to -JC-)
       Post #: 3

Re: Dual batteries for redundancy - 8/9/2003 4:15:53 PM   
Red Scholefield



Posts: 4902
Joined: 12/8/2001
From: Newberry, FL, USA
Status: offline 		[QUOTE]Originally posted by jchris
Question:

If I want to have dual batteries and dual switches on my plane, and not having to add all kinds of regulators and electronic gizmos, can I do that?

One battery will be plugged into the battery slot, and the other battery into an aux channel.

Both batteries are 4.8V 2000 MaH

Anyone done this?

Thx [/QUOTE]

It is a very common practice in larger planes. See the article that addresses it at the Battery Clinic. "Parallel Operation = Reliability and Flight Time"

_____________________________

Red S.
AMA 951 Leader Member

(in reply to -JC-)
       Post #: 4

Thx - 8/9/2003 6:08:58 PM   
-JC-



Posts: 1521
Joined: 12/10/2001
From: Pacific Palisades, CA, USA
Status: offline 		Thanks,

I had heard lots of "experts" talking about cross charging....

Red, never been to your site before. Thanks very much for the link. It is now bookmarked for future reference. LOTS of usefull information there.

_____________________________

John C

(in reply to -JC-)
       Post #: 5

Re: Thx - 8/9/2003 6:16:29 PM   
Red Scholefield



Posts: 4902
Joined: 12/8/2001
From: Newberry, FL, USA
Status: offline 		[QUOTE]Originally posted by jchris
Thanks,

I had heard lots of "experts" talking about cross charging....

[COLOR=blue]Then they are not "experts". Water won't flow up hill. [/COLOR] :

Red, never been to your site before. Thanks very much for the link. It is now bookmarked for future reference. LOTS of usefull information there. [/QUOTE]

Thank you - my little pay back to the hobby I've enjoyed for many years.

_____________________________

Red S.
AMA 951 Leader Member

(in reply to -JC-)
       Post #: 6

Dual batteries for redundancy - 8/23/2003 9:04:09 PM   
Geistware



Posts: 12946
Joined: 4/9/2002
From: Locust Grove, GA, USA
Status: offline 		I set up all my planes this way. The only exception is that I use 5 cell packs instead of 4 cell packs. If I have a cell that shorts, I would like my minimum voltage to be 4.8 until I land! While this is controversial, it is my preference.

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(in reply to -JC-)
       Post #: 7

RE: Dual batteries for redundancy - 9/8/2003 6:28:44 PM   
Spychalla Aircraft



Posts: 473
Joined: 1/9/2003
From: Watertown, WI, USA
Status: offline 		So with a set-up as you describe above, what happens if one of the packs fails from a dead short. Figure it is 4.8v or 6.0v. I don't think it matters. An example would be that one of the power leads running accross the top of a cell wears through on it's insulation. giving you a direct short. I know that the better battery packs are constructed so this is not a risk, but the majority of your everyday, run of the mill Nicad packs are not constructed this way and dead shorts do occur. What happens then?

(in reply to Geistware)
       Post #: 8

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