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Subject Topic: hobby caravan mains power unit
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Message posted by Delboya on 12/11/2013 at 12:41pm
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Hugh
First a minor correction - that should have read a CTEK charger. Secondly, you may have a different distribution box to mine - you mention a 15A fuse - mine has got 2x10 and 1x7.5 amp. However, the process will be the same.

Obviously, don't have any power connected. Remove the cover from the box. Find where the mains feed enters the box - mine was at the top. Trace the feed to where it is connected to the transformer, and disconnect - if necessary making the feed-in cables electrically safe. You could also disconnect the output wires from the transformer. So that is the transformer out of the system, whilst leaving the 240v RCD and MCBs intact. In my case, I already had the 12v feed from the battery coming in to the feed side of the 12v fuses, so that is all I had to do - apart from replacing the cover!!

The battery I put in years ago - I built a small plywood 'shelf' under the wardrobe behind the gas fire. Built it so I the battery is held in place by a couple of bungie cords. The CTEK charger I screwed to the wall above the Hobby electric box - see photos.






First photo shows mass of cables behind fire. I also cut a hole in side of van and covered with a grill to aid air circulation - this cannot be seen as it is 'behind' battery in pic.

Second pic shows the charger screwed to the wall The big blue box is the electronics for the mover. You can also see a 240v socket bottom left - I had already installed this for something else (a rechargeable hand vacuum cleaner), but when I put the charger in, rather than hard-wire it in I just plugged it in (the cleaner had long since died!!). The switch you can see is between the battery and the 12v fuses, so for travelling, I can turn the 12v systems off. It is actually a double pole switch so it is switching both the positive and -ve. [NB I've had to keep spelling out 'positive' as this website doesn't like the plus sign!!]

As your fuse holders have disintegrated, you will need to get something like these:

http://www.ebay.co.uk/itm/10-x-INLINE-STANDARD-BLADE-FUSE-HOLDER-UP-TO-30-AMPS-ATO-WHITE-SIDE-CONNECTORS-/190608501617?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2c6126eb71

Just enter "in line fuse" in ebay.

Simply install one of these, with the correctly rated fuse, between the 12v positive feed from battery/charger (ie from that switch) and each 12v circuit. There is probably a -ve bus that all the 12v circuits return to - simply connect the -ve wire from the switch to this bus.

If anything not clear or you want further info, let me know.

EDIT (after seeing Jeff's comment). When I bought my charger, I got it on-line, far cheaper than any caravan shop around my area. I think it was Amazon, but shop around.

Del

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Message posted by parkranger on 12/11/2013 at 1:29pm
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thanks again Del. yes we have the same power unit, small diffirence is i cant see the rcd on your mains side were i have one. re the fuses i said there were 2 15amps. in mine were you have 10amps. yours will be the right ones my 15amp fuses were there when i bought van. previous owner probably used what he had.your instructions are great,.really have a decision to make now. had offer from neighbour who is a spark, says if i can get the P.C.B out and to him, he can repair the fuse holder a printed circuit.is that possible removing the 12volt side of unit ie transformer and board with 12 v connectors. ??

hugh

Message posted by Delboya on 12/11/2013 at 4:47pm
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Hugh

The indented bit in the top left quadrant of the box you can see the RCD and 1 MCB. In the indented bit bottom right, in the smaller indented bit is the 3 12v fuses.

If you have the same box, I'll take the cover off mine and take another pic showing the wiring. Dark now, so tomorrow.

Del

Message posted by parkranger on 12/11/2013 at 8:43pm
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really appreciate this Del.

hugh

hughcostello1962 at yahoo.co.uk

Post last edited on 12/11/2013 20:58:01

Message posted by parkranger on 13/11/2013 at 12:38pm
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hi Del, i am taking your advice and going with the workaround details you have kindly sent me. been looking at the ctek chargers there are a few to pick from, can you recomend one best for the job, also can you show me were i will connect to the input side of the 12v. i can see the original wires but they dive behind the pcb, i can see 3 wires on the 12 volt feed side .
hugh

Message posted by Delboya on 13/11/2013 at 1:54pm
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Hugh

First remove single large screw 'A' in photo - you probably have already done this:



This will reveal 3 smaller screws marked (approximately) 'B'. lift cover from the bottom - you may have to prize open the 3 tabs along the top 'C'.

This will reveal the inner works:



The feed to the xformer is the wires 'A' - I simply disconnected these leaving the plastic-covered connectors on, thus it is electrically safe.

The wires from the battery - or better still from an isolating switch - are connected as wires 'B'. These connectors will have nothing connected to them. And that is it - provided of course you have had the fuse-holders repaired on the pcb. If not, you'll have to solder in 3 wires onto the live side of the fuses and use in-line fuses as I explained before.

The charger I bought was the CTEK Multi XS 7000. I believe the MXS7.0 8-stage charger is the current equivalent - 94.80 at Amazon. I remember paying around 72 for mine at the time!!   

EDIT: Just had a thought, Hugh. If it is the pcb that is kaput, all this so much BS. If that is the case, you'll have to connect the 12v feed from the battery/charger (wires 'B') direct to some new in-line fuses. You could probably dump the pcb and use that space for the fuses and hopefully still use the connector strip along the bottom.

Best of luck

Del


Post last edited on 13/11/2013 14:57:09

Message posted by parkranger on 13/11/2013 at 5:21pm
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i am nearly there del, can you tell me why on your photo of 12 v system, i can only see original wireing. and not your improvised wireing. also you mention 3 wires . can i send you a photo of my transformer, its the same apart from mine has more 12v wires attatched to the outlet multi block. can i e.mail you the pics as i am not sure how to upload pics on this forum.

hugh

Message posted by Delboya on 13/11/2013 at 5:37pm
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Hugh

Have sent you email.

The wires 'B' on the second pic above are non-standard - that's the feed from the battery that I installed.

The 3 wires I'm talking about are the 3 output 12v circuits. As you can see from the pic, I have removed 2 fuses and one, a 10amp, is still in the fuse holder. The feed to these fuses is via the pcb, and as I said before, if your pcb is cream-crackered, then you would need to take 3 (or more) feeds from the terminals 'B' to 3 (or more) in-line fuses, depending on how mnay 12vf circuits you have.

Del

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