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the12volt`s installbay - Mobile Electronics Forums the12volt's install bay / Relays

Subject Topic: Relay for 12Volt camper fridge (Topic Closed Topic Closed)

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Hilux camper
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Joined: April 06, 2005
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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
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ff-mike
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Joined: November 15, 2004
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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
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Hilux camper
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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
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ff-mike
Copper
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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
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Hilux camper
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Posted: April 17, 2005 at 7:59 PM - IP Logged  

Dear FF

Thanks for the tip and the link.

cheers
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hotwaterwizard
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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 !

posted_image
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Hilux camper
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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?
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hotwaterwizard
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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 !

posted_image
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