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Relay for 12Volt camper fridge


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Hilux camper 
Member - Posts: 4
Member spacespace
Joined: April 06, 2005
Location: Australia
Posted: April 06, 2005 at 12:46 AM / IP Logged  
Dear 12volt
I plan to install a relay and wiring from my vehicle battery through to a camper trailer which holds a 12 volt camping fridge. The fridge has two dual deep cycle batteries connected in series, and the plan is to 'charge' these batteries as I drive.
A store assistant recommended 50amp wiring and relay from vehicle to trailer as insurance against burning out wiring should my fridge batteries run flat when I reconnect car and trailer.
As I understand it, once I turn off my ignition, I automatically disconnect car from trailer batteries which is desirable to avoid draining my car battery.
The assistant also recommended I consider installing a solenoid as part of the wiring system. I'm not sure whether this is necessary.
Could you help with a wiring diagram for the relay, and also comment on the solenoid suggestion? If you recommend I install a solenoid, could you also provide a wiring diagram for that too please.
cheers
ff-mike 
Copper - Posts: 200
Copper spacespace
Joined: November 15, 2004
Location: United States
Posted: April 13, 2005 at 9:11 AM / IP Logged  
The relay and the solenoid would be redundant. A continuous duty solenoid would probably be the best, but I think a 30A relay would work fine also. Wiring is going to be pretty easy for this...
Using 30A 'Bosch' relay
30-Car Battery
85-Ground
86-Trigger- from fuse-box, on with ignition
87-to trailer batteries
Hilux camper 
Member - Posts: 4
Member spacespace
Joined: April 06, 2005
Location: Australia
Posted: April 14, 2005 at 6:18 PM / IP Logged  
That sounds simple enough even for me!
What is your view about the recommendation I go for 50amp wiring? The existing wiring I have is 15 amp, and I have been advised that I risk burning out wiring if my fridge batteries are dead and my vehicle cranks high amps on start up.
cheers
ff-mike 
Copper - Posts: 200
Copper spacespace
Joined: November 15, 2004
Location: United States
Posted: April 15, 2005 at 8:33 AM / IP Logged  
#1- deep cycle batteries should not be run down to less than 50% charge.
#2- I don't think you would need to run wiring for 50A.
A good place to go for this information is the RV forums located here
Hilux camper 
Member - Posts: 4
Member spacespace
Joined: April 06, 2005
Location: Australia
Posted: April 17, 2005 at 7:59 PM / IP Logged  
Dear FF
Thanks for the tip and the link.
cheers
hotwaterwizard 
Silver - Posts: 1,350
Silver spacespace
Joined: December 11, 2003
Location: California, United States
Posted: April 28, 2005 at 11:12 PM / IP Logged  

Just get a Dual Battery Isolator from the RV place. They are Giant Diodes that Isolate the Batteries from eachother.

posted_image

Here is the other way you can do it.

posted_image

John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Hilux camper 
Member - Posts: 4
Member spacespace
Joined: April 06, 2005
Location: Australia
Posted: May 01, 2005 at 7:52 PM / IP Logged  
Thanks for the diagram John. I presume it makes no difference that I have my second battery in the trailer, and not in the engine bay?
hotwaterwizard 
Silver - Posts: 1,350
Silver spacespace
Joined: December 11, 2003
Location: California, United States
Posted: May 01, 2005 at 8:01 PM / IP Logged  
As long as the wire is connected the battery will charge.
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

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