12-24v

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phatwake360

Active Member
Posts
104
does anybody know of a way to convert 12v to 24 v??

the reason i ask is that i can get 24v webasto heaters cheap as chips, but 12v cost a flippin fortune.!!!! and its getting cold :)
 
u can get 24 to 12 v converters. surely wired other way round would work. No gurantees it will, but in my dark days as an apprentice on building sites i did it to a 240 to 110v transformer to charge my drill batterys, so cant see why wouldnt work
 
egor8384 said:
u can get 24 to 12 v converters. surely wired other way round would work. No gurantees it will, but in my dark days as an apprentice on building sites i did it to a 240 to 110v transformer to charge my drill batterys, so cant see why wouldnt work
Click to expand...

EPIC fail post..

Because a diode only works one way?? so you can't reverse the flow and still get it to work.
 
It was a transformer from a light fitting. user rip them out wire the input to the output and wack a plug on it, or to the radio. dunno how it worked, but still got it in my celler somewhere. surely if can ger a 24 to 12, u got be able get a 12 to 24. it only a magnet with wire wound it
 
egor8384 said:
It was a transformer from a light fitting. user rip them out wire the input to the output and wack a plug on it, or to the radio. dunno how it worked, but still got it in my celler somewhere. surely if can ger a 24 to 12, u got be able get a 12 to 24. it only a magnet with wire wound it
Click to expand...

even bigger FAIL!

look up AC and DC and note the difference.
 
You can get 24V by connecting another battery in series. However, charging it is another matter.
I used to have a Classic Mini with a very high compression, stage 3 tuned Cooper S engine. That was a bastid to start because the starter wouldn't turn it over fast enough against the compression. We solved that with a second battery, so that the starter had 24V across it and the rest of the car ran off 12V from the centre tap of the 2 batteries. The second battery was charged by a black box, which was built by a mate who was an electronics nerd - some kind of oscillator / transformer / inverter arrangement).
 
Don't forget that converting 12V to 24V you will be drawing twice the current.
If your Webasto is 32W then it will be drawing 1.4A at 24V but on the other side of the transformer it will be drawing 2.7A at 12V assuming no losses.
We are not talking massive figures here but beware.
 
Litch said:
Don't forget that converting 12V to 24V you will be drawing twice the current.
If your Webasto is 32W then it will be drawing 1.4A at 24V but on the other side of the transformer it will be drawing 2.7A at 12V assuming no losses.
We are not talking massive figures here but beware.
Click to expand...

as your working off of a 15A supply i don't thing it will be a problem
 
"as your working off of a 15A supply i don't thing it will be a problem"

If working off a cigarette socket perhaps but why would you plumb in a Webasto heater and then have the power supply plugged into a socket on the dash? Surely it would be hard-wired into its own fused supply and that is where I was coming from, just because the current draw of the Webasto is one figure it doesn't mean you can use this for your cabling or fusing requirements.
As I previously said, we are not talking massive figures here but it might just make a difference depending on how it was wired in.
 
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