hillbillyracer
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| posted on 3/1/08 at 11:00 AM |
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12v compressor.
Has anyone had much to do with 12v compressors, not the sparrow-fart plug in the faglighter things.
I'm looking at this:
http://www.warn.com/truck/aircompressors_spi.shtml
I'm thinking it's going to draw a fair bit of power but that particular spec is'nt listed, I'm wondering how my alternator
& battery would cope. It'd be going in my VW 2.5 TDI Transporter.
Anybody know if such things are any good? This one is a new product but the company behind it has a decent reputation & it looks a bit more
workman like than some others. They are used on 4x4s to work air-locker diffs etc but this one is supposed to be a bit heavier & rated for 100%
duty cycle.
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wilkingj
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| posted on 3/1/08 at 11:18 AM |
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It doesnt give the current rating, and if its Warn, it wont be cheap.
I bet it pulls 20 plus Amps at least.
There is no data on this in the manual, but it does state:
BATTERY RECOMMENDATIONS
A fully charged battery and good connections are
essential to the proper operation of your compressor.
The minimum requirement for a 12 volt DC battery is
650 Cold Cranking Amperes.
Thats a BIG battery to go in a 7.
Have a look at Matt Savages site, he sells Viair products. (not that cheap either)
Linky
At least it will give you an option, and some prive comparisons.
You could also use an Air Con compressor, as a lot of the Landy people do.
I suppose it depends on how much you will use it, and what for.
I want one to drive my air horns...
they need a constant 150Psi.
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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Bluemoon
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| posted on 3/1/08 at 11:24 AM |
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To be used in VW 2.5 TDI Transporter not a 7..
I would expect the current draw to be very large, for a decent compressor you are probably talking about 1KW, so that's going to be 83A!
So it depends on what size compressor you need. I expect the better option might be a seperate petrol/deisel compresor?
You might get away with that one for jobs that require only a small amount of air, at a low duty cycle (thus not discharging you battery to much).
Dan
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matt_claydon
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| posted on 3/1/08 at 11:43 AM |
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Engine driven compressor on auxillary drive belt? Don't know what's available and space could be an issue but would save on the ridiculous
alternator / wiring requirements.
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dan__wright
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| posted on 3/1/08 at 11:59 AM |
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83A isnt ahuge amount tbh in a tintop, my two amps in mt tintop draw just under 100A when sub drops through 4awg so it shouldn't be too bad and
provided you keep engine running you should be okay.
the alternators on the vw vans are 70 iirc but you there is someone on ebay who sells uprated ones or you could double up and run 2.
FREE THE ROADSTER ONE…!!
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britishtrident
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| posted on 3/1/08 at 12:29 PM |
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The spec says 12 cfm
12 cfm demands at least 2.5 hp motor --- just under 2kw --- I don't know what the efficiency is but I would think it would need >3 kw
input
3kw/13v = 230 amps ---- nb starting current will be much higher.
IMHO Not really viable
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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hillbillyracer
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| posted on 3/1/08 at 12:58 PM |
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The 12 CFM is just the free air CFM, at 90PSI it's only 4. All the same I could see it drawing 40-50amps but I couldn't see how to work
out the actual power requirement.
It'd be used with a small air tank from a lorry to blow up tyres, blast muck from something being taken to bits, a quick burst of an impact gun
etc. Just something to use out on site for minor jobs.
The idea of an air-con compressor is great, it'd crossed my mind but do they not need to be running with the correct gas for seals etc to
last?
I've had nothing to do with WARN till a couple of weeks back when we fitted a winch to a 6x6 Polaris Ranger, seemed well made & no nonsense
kit.
Mabye I could use the air pump from a vehicle with air suspension such as a Range Rover but they seem to make plenty on Ebay for something
that's second hand & would mabye need adapting to suit my needs.
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hillbillyracer
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| posted on 3/1/08 at 02:31 PM |
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Cheers for the link there wilkingj, even the biggest on there uses just 17a but it seems to be a bit slower than the Warn, as you say though not just
for pennies. He also does an engine driven one but thats just a bit too much.
I'm putting the job on hold for now anyway, I'm boarding & insulating the back of the van out & wanted to make any space &
mods needed with a view to fitting one later but the best place for it looks to be under the double passenger seat & that will be easily done
later.
Cheers for the help fellas.
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MkIndy7
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| posted on 3/1/08 at 07:39 PM |
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quote:
Originally posted by dan__wright
83A isnt ahuge amount tbh in a tintop, my two amps in mt tintop draw just under 100A when sub drops through 4awg so it shouldn't be too bad and
provided you keep engine running you should be okay.
Surely to god they don't actually draw 83A! they might be fused upto 83A peak but its not a constant draw like this compressor would be.
I've got 2 amps with 30A fuses in each that are only supplied by a 35A fuse or something like that, not the 60A they should be supplied with in
theory and its never blown and thats far more than loud enough!.
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