Joined: April 06, 2005 Location: Australia Posts: 4
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.
Joined: November 15, 2004 Location: United States Posts: 200
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
Joined: April 06, 2005 Location: Australia Posts: 4
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.
Joined: December 11, 2003 Location: California, United States Posts: 1,306
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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Topic: Relay for 12Volt camper fridge 
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