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24v from 12v

 
 
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naughtyboy
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Joined: 01 Jan 2006
Odometer: 966
Location: west yorks



PostPosted: Thu Sep 29, 2011 4:07 pm    Post subject: 24v from 12v Reply with quote

have just aquired a in cab diesel heater from a wagon.
not sure which one as guy runs a small breakers and done swap for disco doors.
prob is its 24v how can i get 24v from 12v?
am running twin batss to run extras, or am i better fitting second alt where air con should be?
if so how do i wire it up?

hope this makes sense cheers
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bazza_413
Just got MTs


Joined: 28 Aug 2006
Odometer: 258
Location: Eastbourne



PostPosted: Thu Sep 29, 2011 6:08 pm    Post subject: Reply with quote

What current draw does the heater have?? You can get 12 to 24 volt converters but they tend not to have to high a current output. You can set up dual alternators but you need to ensure the positive side is fully isolated.
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spannerman69
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Location: st.helens



PostPosted: Thu Sep 29, 2011 7:33 pm    Post subject: Reply with quote

is this for the project ? .

also have you considered a arctic heater in its place .

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naughtyboy
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PostPosted: Fri Sep 30, 2011 6:24 am    Post subject: Reply with quote

no its for mine as heater in it is useless and we are going to iceland next year.
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Joined: 19 Jun 2002
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Location: Northern Ireland's Gold Coast


2009 Land Rover 110 CSW

PostPosted: Fri Sep 30, 2011 7:08 am    Post subject: Reply with quote

Is it an electric heater or just an electric blower?
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Lolita the Lightweight
???? the V8 90 CSW
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naughtyboy
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Joined: 01 Jan 2006
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Location: west yorks



PostPosted: Fri Sep 30, 2011 11:20 am    Post subject: Reply with quote

its a diesel powered one but timer etc is 24 v
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Difflock Royalty


Joined: 19 Jun 2002
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Location: Northern Ireland's Gold Coast


2009 Land Rover 110 CSW

PostPosted: Fri Sep 30, 2011 11:29 am    Post subject: Reply with quote

Have you tried connecting it to 12 volts to see if it works? You might be surprised!
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Bert the Defender 110 XS - because it's Cool (work it out yourself!)
Lolita the Lightweight
???? the V8 90 CSW
Suzuki DL1000 V-Strom - yes that's right, I have a Zook!
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jeepmadmike
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PostPosted: Fri Sep 30, 2011 11:50 am    Post subject: Reply with quote

There was a thread on here ages ago about the problem

Im sure the guy just used a 12-24v converter

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Now i have gone and bought a D4!

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naughtyboy
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PostPosted: Fri Sep 30, 2011 11:56 am    Post subject: Reply with quote

must admit havent tried it on 12v.
hes bringing it up tonight.
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mrcheese
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Joined: 14 Oct 2003
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PostPosted: Fri Sep 30, 2011 12:57 pm    Post subject: Reply with quote

I would rig up a 24V supply using two car batteries and measure the current taken. That would allow the right decision to be made.

You might consider a 12V to 240V inverter. Then a suitable 24V adapter.
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naughtyboy
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PostPosted: Fri Sep 30, 2011 1:07 pm    Post subject: Reply with quote

that would be easier mr cheese as already got inverter fitted
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Kitesurf
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Joined: 28 Feb 2005
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Location: Luton, Beds


1994 Toyota Surf

PostPosted: Fri Sep 30, 2011 2:54 pm    Post subject: Reply with quote

naughtyboy wrote:
its a diesel powered one but timer etc is 24 v


The timer/igniter circuit on these heaters shouldn't draw too much current and 12V to 24VDC converters are available. Is it an Eberspacher (spelling) heater? If so, it may be dual voltage as they are now popular in motor homes and camper vans.

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teamidris
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PostPosted: Fri Sep 30, 2011 6:37 pm    Post subject: Reply with quote

I believe you can charge a totally isolated 24 volt system by the 12 volt car electrics. You fit a timer and alternately charge the 12 volt batteries in turn. Just like you were taking turns to charge two cars with flat batteries with jump leads. The theory is sound, but no one will try it Confused Pussies

Or: The glow plug is the problem, as it's 24volt. We didn't think it senced the current at the controller, so it could be replaced with a 12volt glow plug driven by a relay from the 24volt circuitry. As the fan doesn't use much power, it should be okay being powered by a 12-to-24 converter.

Or: A friends canal boat nearly sucessfully charged batteries off a 240volt battery charger. So a small 24volt charger should run off a good inverter. But the switchmode system of the charger wasn't that keen on the square wave output of the inverter? Washing machines wern't happy either.

But when all said and done, the 24volt erbaspacer works bettter than the 12volt, which I have 2 of, and both drop out on startup with a slightly low battery Sad

So I got this; http://www.lockgate-stoves.co.uk/ and it doesn't use leccy Very Happy Though not much use while moving, it's a good static heater Cool

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bazza_413
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Joined: 28 Aug 2006
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Location: Eastbourne



PostPosted: Sat Oct 01, 2011 7:43 am    Post subject: Reply with quote

12 to 24 volt step up inverter link http://www.ebay.co.uk/itm/12V-24V-VOLTAGE-CONVE...33#ht_1530wt_1163
240v ac to 12vdc inverter http://www.ebay.co.uk/itm/Input-AC-200-240V-Out...31#ht_1726wt_1163

Which ever way you do it you need to find the current draw of the heater if you go down the 240 to 24 volt route as if you overload the 24v inverter you could also screw up the 240v inverter, you also need to ensure that the 240v inverter you have would provide enough power for the heater and other 240 items at the same time.
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Nathaniel
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Joined: 13 May 2003
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Location: North, North Yorkshire


1979 Suzuki LJ

PostPosted: Sun Oct 09, 2011 10:38 pm    Post subject: Reply with quote

24v Eberspacher CANNOT be economically converted from 24v to 12v...
Its not worth it.

I looked at this for fitting my 24v eber to my fourtrak.

This was the thread
http://forum.difflock.com/viewtopic.php?t=21087&highlight=

I never did it, I bought a Soft top Landrover 109, which needed the heater more than the fourtrak!

Happily the Landy was ex army and was already 24v!

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If You Open Your Mind Too Much Your Brain Will Fall Out
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cynic-al
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Joined: 14 Nov 2006
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Location: scunthorpe


1989 Suzuki SJ

PostPosted: Tue Oct 18, 2011 3:40 pm    Post subject: Reply with quote

you could always sell the 24v and buy a 12v Smile
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