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BATTERY MASTER SWITCH

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Fergus Kyle

Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada

Posted: Mon Aug 06, 2007 6:44 am Post subject: BATTERY MASTER SWITCH

Cheers,

	I'm still searching for that elusive device - in an attempt to avoid

the cost of an ampere or two of contactor current - which will control a

primary battery source and another for secondary battery source.

	I have found several which meet one criterion or another, but not

all: 

[a]	should carry as much current as a contactor for that job;

[b]	needs to be an up-down rather than rotary type switch;

[c]	should be on a remote(able) stalk so I can undo the connection to

remove the 	instrument panel ;

[d]	cost less than the usual contactor - or at least be competitive.

	I have devised a system to isolate the controls from wandering

fingers so am not fussy about security. I'm not sure what a "Kill switch" is

really.

	Any help would be most appreciated.

Ferg

Classic 914 CS prop mono

PS: My server is down for the last 2 days, so my thanks will be

delayed.........

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rampil

Joined: 04 May 2007
Posts: 870

Posted: Mon Aug 06, 2007 9:55 am Post subject: Re: BATTERY MASTER SWITCH

Fergus,



I use a solid state contactor, the EV200 which meets some of your 

criteria. It can handle 500A (enough to start a cold 914 or even a 912s),

has a hold current of 0.125.  It is not cheap however at $90, but it is

less weight on the firewall.

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_________________
Ira N224XS

rob(at)hyperion-ef.com
Guest

Posted: Mon Aug 06, 2007 1:16 pm Post subject: BATTERY MASTER SWITCH

The EV200 http://www.allproducts.com/manufacture97/szshanghe/product4.html

looks suspiciously like a conventional mechanical relay/contactor.  Here's a

solid state relay:

http://www.allproducts.com/manufacture98/sunwutech/product5.html It is

necessary to enlarge the picture to read the rating on this device (25A).

Best regards,



Rob Housman

Irvine, California

Europa XS Tri-Gear

S/N A070

Airframe complete



--

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Gilles.Thesee(at)ac-greno
Guest

Posted: Mon Aug 06, 2007 1:38 pm Post subject: BATTERY MASTER SWITCH

Rob Housman a écrit :

 	  Quote: 	
		   The EV200 http://www.allproducts.com/manufacture97/szshanghe/product4.html

 looks suspiciously like a conventional mechanical relay/contactor. 

Rob and all,
	




Indeed, it is a mechanical contactor, and it is not light either.

I installed two of them in our dual battery project. No problem with the 

contactors themselves, but I suspect their command circuit sends some 

perturbation in the ship's circuit, and I experienced some problems with 

my low voltage warning module.

http://contrails.free.fr/elec_lvwm_en.php



Best regards,

-- 

Gilles

http://contrails.free.fr

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rampil

Joined: 04 May 2007
Posts: 870

Posted: Mon Aug 06, 2007 5:22 pm Post subject: Re: BATTERY MASTER SWITCH

OK, the EV200 has mechanical contacts, but a) there is nothing inherently

wrong with mechanical contacts, and b) the hold current is, as I said

1/8 or less than that of a conventional solenoids.



Giles, I have a Nuckolls, LVBM circuit in my plane and have not noted

any interaction.  Why do you suspect the EV200?

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_________________
Ira N224XS

Gilles.Thesee(at)ac-greno
Guest

Posted: Mon Aug 06, 2007 11:41 pm Post subject: BATTERY MASTER SWITCH

Ira and all,



 	  Quote: 	
		    b) the hold current is, as I said

 1/8 or less than that of a conventional solenoids.

   


	


That's why I chose these contactors.



 	  Quote: 	
		   Giles, I have a Nuckolls, LVBM circuit in my plane and have not noted

 any interaction.  Why do you suspect the EV200?

   


	


Some info at http://contrails.free.fr/elec_lvwm_en.php

When the EV 200 are replaced with a standard contactor the problem 

vanishes...

Best regards,

-- 

Gilles

http://contrails.free.fr

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rampil

Joined: 04 May 2007
Posts: 870

Posted: Tue Aug 07, 2007 6:14 am Post subject: Re: BATTERY MASTER SWITCH

Rob,



The solid state relay you point to has a max current rating of 25A.

This is about 1/4 that needed to function as a true master contactor

and handle starting load for the engine.

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_________________
Ira N224XS

paul.mcallister

Joined: 09 Jan 2006
Posts: 177
Location: Waukesha, WI USA

Posted: Thu Aug 09, 2007 3:13 pm Post subject: BATTERY MASTER SWITCH

Hi Ferg,



I used an EV200 in my Europa and it worked fine until I had my "hit by

lighting" incident.  It turned the electronics into a small charred spec and

obviously didn't work anymore.  Of course this left me flying at 9500' with

the master contactor turned off.  Fortunately I have my system set up with

an essential buss that can be feed directly for the battery.  I guess it was

some real world testing.



Anyhow, as part of my repairs while I was "on the road" so to speak I

installed a contactor from a NAPA auto parts store for $16.50 and there it

has stayed from that day to this. It was smaller and lighter than the EV200

and it didn't cost $90... I assume that if I get hit by lightning again

(perish the thought) then it will probably continue to work.



I did try a solid state 1600A device for a while.  It worked fine until the

engine kicked back and it went the same way as the EV200 electronics.  Pity

really because it only weighed a few ounces and I didn't have to pay a one

amp penalty when it was energized.



So, in conclusion, go down to the local NAPA store and by a low tech

contactor or a battery isolator switch, sometimes simple is best.



Paul

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raimo.toivio(at)rwm.fi
Guest

Posted: Fri Aug 10, 2007 9:41 am Post subject: BATTERY MASTER SWITCH

Dear Ferg



here is my solution.



I divided the electrical consumption in two as follows:



1) starter, trimming devices, stall warning, gear warning, 

door warnings, clock, Dynon back-upp charger, burglary-alarm etc.



This is handled by full mechanic main-swithch

which is installed over the glove shelf (it does not

prevent removing the panel, it is light weight, cheap

and solid and it is operated w/o el pwr). 

The switch is about similar somebody has installed

to the co-pilot´s head rest in the case his accu is in the back.

Price was about 15 euros.



2) all the rest is handled by small automotive type relay 

http://www.biztee.com/Products/2649.html

using about 30 mA. It handles 40A which is enough for me.

I use it by "master switch" in my panel´s left side.

Price was about 5 euros.



- normally # 1 is always open and # 2 is closed

(trim CB must open also separately!).



- when flying both are closed (ON) of course.



- in the case of emergency landing I open # 2 and

leave # 1 closed - so I am still able to start, use trim

and have all the warnings I am used to (and clock is in time!)



- during long (more than two weeks) staying period I open (OFF) both 



This was simple, cheap, lightweight, prctical and safe solution for my purposes.



Wishes, Raimo

---

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