caravan 12 v/ 240v

Submitted: Tuesday, Mar 26, 2013 at 16:52
ThreadID: 101306 Views:1523 Replies:3 FollowUps:3
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Gooday all : electrical question , I have a jayco caravan 12 volt lights only & i have fitted a battery to it , So when i connect it to 240 v , what happens to the 12 volt side ... I tested the wire going to the battery while bis-connected & read about 6 volts . does the battery need to be disconnected when 240v is connected ?

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Cheers Nick b
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Reply By: Racey - Tuesday, Mar 26, 2013 at 17:00

Tuesday, Mar 26, 2013 at 17:00
Nick, The lights are powered by the battery as normal and the 240v will charge the battery. That's assuming the lights originally operated from the 240v supply. The wiring you tested, was that connected to the battery, or from the charger?

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Jon
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Follow Up By: Member - nick b - Wednesday, Mar 27, 2013 at 07:42

Wednesday, Mar 27, 2013 at 07:42
thanks racey , the wire tested is the power wire to the car plug not plugged in or connected to battery but plugged in to 240 .
c/van 2004 , didn't come with battery ,
Am I right in thinking that when plugged in to the 240 supply it is trickle charging the 12v supply .
Cheers Nick b
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Reply By: Ozhumvee - Tuesday, Mar 26, 2013 at 18:21

Tuesday, Mar 26, 2013 at 18:21
Did the van originally have a battery?
If it didn't then the lights are just run off a 240 to 12v transformer when on the mains and straight off the car when not connected to the mains.
The original 240 to 12v transformer will not be able to charge the battery or do what is required.
Might be best to take it to a caravan place or autolecky for sorting out.
Peter
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Reply By: Member - Bruce C (NSW) - Tuesday, Mar 26, 2013 at 19:18

Tuesday, Mar 26, 2013 at 19:18
Hi Nick,
If the Jayco was made after around 2000 then it will more than likely have a multi stage charger which will charge the battery and all 12 volt appliances and outlets will run off the battery. If made after around 2002 it will definitely have a multi stage charger built in.

However if your van was made before they were putting batteries in the vans then it will be as Humvee said. Designed to run the lights only most probably.

Now that you have installed a battery, if it does not already have a factory multi stage charger then I would suggest you get a good sized (15 to 25 amp output) CTEK charger or similar (Projector make good units as well) to charge your battery.
Leave the CTEK (or similar) connected to the battery and plugged into a 240 outlet all the time and it wil always keep your batteries topped up to the max and run your lights as well when plugged into a shore supply (van park power etc).

If in doubt, as Humvee says, see a proffesional.

Cheers, Bruce.
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Follow Up By: Member - nick b - Wednesday, Mar 27, 2013 at 07:57

Wednesday, Mar 27, 2013 at 07:57
thanks all , jayco 2004 & did not come with battery, So the question is ( forgetting the battery i have fitted ) is it all right to connect to car plug & power at the same time ?
cheers
Cheers Nick b
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Follow Up By: Member - Bruce C (NSW) - Wednesday, Mar 27, 2013 at 17:50

Wednesday, Mar 27, 2013 at 17:50
Nick,
Theoretically it should be OK but this brings up another point.

I only got my 23 foot 2006 Jayco Sterling about 12 months ago and as it was already fitted with a battery, albeit that it was not in the van but the wires were, it was easy to sort it out.

The Anderson plug fitted to our van only powered the frig in the van from the car so I do not know if this is normal Jayco practise or if this is something that was done by the previous owner. I never run the van three way frig off 12 volts so it seemed a little strange to me.

When you ask "is it alright to connect the car plug and power at the same time?, I would think it is, but whether the car plug is charging your batteries or just powering the frig while travelling I cannot say.

If you know how to use a multi meter it will be an easy thing to find out.

If your car plug is charging your van battery then all you are doing when plugged into 240 power is charging the car battery as well as the van battery, if your van charger is big enough, I assume.
The charger will merely see it as another battery and keep charging provided the charger is big enough.

I say that because I do not know exactly what your setup is as your outline does not paint a clear enough picture.

The things needed to get a better idea are;
1 What is the rated output of your vans transformer/battery charger
in amps.
2 What sort of plug is fitted to the power supply line between the
car and van. Is it an Anderson plug or the 7 or 12 pin flat plug.
Andesron plugs carry more current.
3 What does that power lead actually power. eg Van battery or Frig
12 Volt power

Nick, I am leaving for a 4 week holiday in the morning so I may or may not be able to get back to you depending on whether I can get internet connection over the weekend. If I can I will certainly help you but there are many others here with far more knowledge than me on these subjects if I am unavailable. Failing that a quick chat to your local autolecy will sort it out in no time.



The above drawing shows how I would expect the circuit to be laid out with the frig comming off the house supply if needed. Some may prefer the frig powered from the car, it is a personal thing in my opinion.

Cheers, Bruce.
At home and at ease on a track that I know not and
restless and lost on a track that I know. HL.

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