 |
|
15 Jul 2002
|
|
Registered Users
HUBB regular
|
|
Join Date: Jul 2001
Location: Amsterdam, The Netherlands
Posts: 93
|
|
|
Baldrick,
I noticed that Daerrs now offer the VIAIR compressors as well. Compared to ARB's offering they're actually cheaper.
In their catalogue, Daerr state that the 12 volt VIAIR compressors can easily be run off a 24V vehicle by putting the clamps on one of the two 12V batteries. In theory this should work obviously but I've always been told that this ruins your batteries. Has anyone got experience with this?
cheers,
Camiel
|
16 Jul 2002
|
|
Registered Users
Veteran HUBBer
|
|
Join Date: Nov 2001
Location: Cairo, Egypt
Posts: 456
|
|
I've done it a handfull of time and got away with it with no problems as long as the engine is running. What's the argument here, why would the batteries go bad?
------------------
A.B.
www.ShortWheelbase.com
__________________
A.B.
OasisPhoto.com – Images from the Magical Sahara.
|
16 Jul 2002
|
|
Registered Users
New on the HUBB
|
|
Join Date: Apr 2002
Location: Vienna, Austria
Posts: 12
|
|
|
I'm no expert, but I think that charging two 12 volt batteries from a 24v source requires the batteries to be of similar capacaties and output rating, that the charge is equally split between the two. Any imbalance would cause one battery to recieve a higher and possibly damaging charge, and theoretically a large enough compressor could cause this imbalance.
I'm no electrical engineer so my theory could be complete rubbish:- Any thoughts?
|
16 Jul 2002
|
|
Registered Users
HUBB regular
|
|
Join Date: Jul 2001
Location: Amsterdam, The Netherlands
Posts: 93
|
|
|
I am no engineer either so I checked with the garage. They basically confirmed what Baldrick is saying. While it is not too harmful to occasionally tap 12V from a 24V system, it does wear out the battery in the long run.
Camiel
|
18 Jul 2002
|
|
Registered Users
HUBB regular
|
|
Join Date: Jul 2001
Posts: 24
|
|
|
Another option, which might be cheaper for some (though not cheaper than buying used stuff out of the junk yard)--
I bought a 12v compressor, in the US but I think the company is australian. It's called "big red" but it is made by one of the main compressor manufacturers, thomas I think. So I bolted it into the rear of the jeep, ran wires, switch, relay, etc forward to the battery, and everything works great. Add a 25' coil hose and it will pump up all the tires in a few minutes. Not as fast as an engine-driven compressor, and no running of air tools, but installing it was nice and easy, and it supplies enough air for my needs. There are a bunch of companies offering similar products if you don't want to go looking through the junk yards...
(And if you do like junkyards, I am told that older cadillacs had air-controlled suspensions, with nice strong air compressors.)
|
25 Jul 2002
|
|
Registered Users
Veteran HUBBer
|
|
Join Date: Nov 2001
Location: Cairo, Egypt
Posts: 456
|
|
Just curious, does this thread win the “Most Posts” award? 
------------------
A.B.
www.ShortWheelbase.com
__________________
A.B.
OasisPhoto.com – Images from the Magical Sahara.
|
25 Jul 2002
|
|
Registered Users
Veteran HUBBer
|
|
Join Date: Apr 2000
Posts: 281
|
|
I couldn't help but notice that this subject has gone crazy with replys!! Good one Sam! I'm sure Chris Scott will give you a free tee shirt. Although it might be one of his old ones!!
Regarding these compressors, the one I now get is 1.7 cfm (about 48 lpm). These are made by VIAIR, and I sell it with a 50 ft (15m) hose and tyre inflator. Have a look at my web site. www.mattsavage.co.uk
We've just returned from the Land Rover show at Billing. I took 10 of these compressor kits with me expecting to sell maybe 4 or 5 over the three day show. We sold them ALL on the first day!
Cheers,
Matt Savage
|
30 Jul 2002
|
|
Registered Users
HUBB regular
|
|
Join Date: Aug 2001
Location: London, UK
Posts: 89
|
|
|
Those people with aircon (ie engine-driven) compressors:
How is the pump turned off and on? I'm just thinking about how much power an aircon unit saps from an engine. If it's belt-driven, how do you turn it off when you're driving?
sorry if this is a stupid question!
|
30 Jul 2002
|
|
Registered Users
Veteran HUBBer
|
|
Join Date: Apr 2001
Location: Scotland
Posts: 775
|
|
The York compressor comes with a magnetic clutch controled by an electric switch. This allows the pump to freewheel when not in use, so power consumption is minimal.
------------------
Roman (UK)
www.polandrover.com
__________________
----------------
Roman (UK)
|
30 Jul 2002
|
|
Registered Users
Veteran HUBBer
|
|
Join Date: Nov 2001
Location: Cairo, Egypt
Posts: 456
|
|
The setup works just like Roman explained above. If you have a tank, then you must install a pressure switch to the tank and hook both it’s pole to one of the switch wires. The switch will turn cut electricity when the tank is full no matter the position of the switch itself. And will turn it on when the tank is empty but the compressor clutch will engage and run the compressor only if the switch is on.
I can dig up a wiring diagram if it would help.
------------------
A.B.
OasisPhoto.com – Images from the Magical Sahara.
ShortWheelbase.com – Jeep preparations.
__________________
A.B.
OasisPhoto.com – Images from the Magical Sahara.
|
30 Aug 2002
|
|
Registered Users
Veteran HUBBer
|
|
Join Date: Mar 2001
Posts: 921
|
|
|
After starting this thread, I figure I may as well tell the end of the story.
I bought a "Grand Erg", with high expectations (given it's impressive cost). It never worked properly from the first moment - see my note approx mid Sept.
I have been told that I will have to pay a further €102 (over £60)(plus postage to Italy) to have it put into working order.
This is not the level of service you should expect for something that costs over £400. I cannot advise anyone to buy this unit - mine didn't work, and now I'm expected to pay more to rectify a factory-original fault.
Just thought I should let you know!
Sam.
|
30 Aug 2002
|
|
Registered Users
Veteran HUBBer
|
|
Join Date: Mar 2001
Location: Switzerland
Posts: 332
|
|
Hi Sam,
"Just back from three months in Sahara, grand Erg was just the job many times. In reality, takes a minimum of five minutes to get each tyre back to road pressure (37psi), and sometimes nearer ten. .... Sam"
Thats is worse than the performance of my little Thomas unit (asuming 7.50R16 tyres).
What, according to Grand Erg, is the problem and what do they propose to improove in detail?
GE provides a table with inflation times on their web site: http://www.granderg.com/compressori.htm
So if the compressor does not fit thees promisses, then it should not be your turn to pay the repair!!??
I will observe this thread, it might get interesting for my german site www.sahara-info.ch
Good luck, Yves
__________________
Yves
|
8 Oct 2002
|
|
Registered Users
Veteran HUBBer
|
|
Join Date: Mar 2001
Posts: 921
|
|
|
Okay,
Took the motor out and sent it off to Grand Erg. It was a 24V motor, no wonder it wasn't very impressive! A replacement motor has just arrived, I will fit it this weekend and see how it goes.
Off to Algeria in three weeks, where the wee beastie will get lots of use and will report back afterwards - expecting to be suitably impressed - we shall see.
Sam.
|
9 Oct 2002
|
|
Registered Users
Veteran HUBBer
|
|
Join Date: Sep 2002
Location: Nottingham, UK
Posts: 180
|
|
Adding another option to the menu:
I am currently installing a 12V ExtremeAire compressor, to my Defender 6x6 conversion, after originally planning to use an inverter and a 240V compressor. (I found my 1500Watt inverter tripped out because the AC induction motor pulls a LOT more current on start-up than its nominal power requirement).
The Extremeaire has 100% duty cycle, which is useful (6 tyres can take quite a while to inflate!). They claim a 4 cfm free flow rate, which is supposed to inflate a 33x12.5x15 tyre from 15psi to 30psi in 90 seconds!)
Cost is a bit frightening at £240, plus freight, plus VAT, though.
I will report back when I've used it in anger
Regards,
Michael
|
9 Oct 2002
|
|
Registered Users
Veteran HUBBer
|
|
Join Date: Sep 2002
Location: Nottingham, UK
Posts: 180
|
|
Quote:
Originally posted by camiel:
Baldrick,
<snip>
In their catalogue, Daerr state that the 12 volt VIAIR compressors can easily be run off a 24V vehicle by putting the clamps on one of the two 12V batteries. In theory this should work obviously but I've always been told that this ruins your batteries. Has anyone got experience with this?
cheers,
Camiel
|
Noooooo, NEVER take a 12V feed directly off a 24V system. Lots of ill-informed debate on this issue, but the short answer is that even a trickle feed off of one battery will sooner or later (and usually sooner) ruin one or both batteries.
Yes, you'll get nice clean 12V from the battery, (which is all Daerr care about, apparently) but the 24V charging system will do some nasty things as it tries to replace the charge.
Remember, the batteries are being charged in series. Imagine one is empty, and the other full. This is NOT the same as charging two batteries in parallel - the empty one will never get full, and the full one will be overcharged. They will both die, one slowly and painfully, and other possibly messily and spectacularly.
The website suggested you do this either knows nothing about batteries, or they own shares in a battery manufacturer!
Regards,
Michael...
P.S. You can get some electronic 24V to 12V converters, but it'd be hell of expensive and bulky to cope with, say, 30 or 40 amps (which I would guess might be what these compressors would draw).
|
LinkBacks (?)
LinkBack to this Thread: https://www.horizonsunlimited.com/hubb/equipping-the-overland-vehicle/vehicle-mounted-air-compressors-20039
|
| Posted By |
For |
Type |
Date |
| air pumps |
This thread |
Refback |
22 Feb 2007 14:35 |
|
Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
|
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
Check the RAW segments; Grant, your HU host is on every month!
Episodes below to listen to while you, err, pretend to do something or other...
2020 Edition of Chris Scott's Adventure Motorcycling Handbook.
"Ultimate global guide for red-blooded bikers planning overseas exploration. Covers choice & preparation of best bike, shipping overseas, baggage design, riding techniques, travel health, visas, documentation, safety and useful addresses." Recommended. (Grant)
Ripcord Rescue Travel Insurance™ combines into a single integrated program the best evacuation and rescue with the premier travel insurance coverages designed for adventurers.
Led by special operations veterans, Stanford Medicine affiliated physicians, paramedics and other travel experts, Ripcord is perfect for adventure seekers, climbers, skiers, sports enthusiasts, hunters, international travelers, humanitarian efforts, expeditions and more.
Ripcord travel protection is now available for ALL nationalities, and travel is covered on motorcycles of all sizes!
What others say about HU...
"This site is the BIBLE for international bike travelers." Greg, Australia
"Thank you! The web site, The travels, The insight, The inspiration, Everything, just thanks." Colin, UK
"My friend and I are planning a trip from Singapore to England... We found (the HU) site invaluable as an aid to planning and have based a lot of our purchases (bikes, riding gear, etc.) on what we have learned from this site." Phil, Australia
"I for one always had an adventurous spirit, but you and Susan lit the fire for my trip and I'll be forever grateful for what you two do to inspire others to just do it." Brent, USA
"Your website is a mecca of valuable information and the (video) series is informative, entertaining, and inspiring!" Jennifer, Canada
"Your worldwide organisation and events are the Go To places to for all serious touring and aspiring touring bikers." Trevor, South Africa
"This is the answer to all my questions." Haydn, Australia
"Keep going the excellent work you are doing for Horizons Unlimited - I love it!" Thomas, Germany
Lots more comments here!
Diaries of a compulsive traveller
by Graham Field
Book, eBook, Audiobook
"A compelling, honest, inspiring and entertaining writing style with a built-in feel-good factor" Get them NOW from the authors' website and Amazon.com, Amazon.ca, Amazon.co.uk.
Back Road Map Books and Backroad GPS Maps for all of Canada - a must have!
New to Horizons Unlimited?
New to motorcycle travelling? New to the HU site? Confused? Too many options? It's really very simple - just 4 easy steps!
Horizons Unlimited was founded in 1997 by Grant and Susan Johnson following their journey around the world on a BMW R80G/S.
Read more about Grant & Susan's story
Membership - help keep us going!
Horizons Unlimited is not a big multi-national company, just two people who love motorcycle travel and have grown what started as a hobby in 1997 into a full time job (usually 8-10 hours per day and 7 days a week) and a labour of love. To keep it going and a roof over our heads, we run events all over the world with the help of volunteers; we sell inspirational and informative DVDs; we have a few selected advertisers; and we make a small amount from memberships.
You don't have to be a Member to come to an HU meeting, access the website, or ask questions on the HUBB. What you get for your membership contribution is our sincere gratitude, good karma and knowing that you're helping to keep the motorcycle travel dream alive. Contributing Members and Gold Members do get additional features on the HUBB. Here's a list of all the Member benefits on the HUBB.
|
|
|
helps answer the question - Why Go? Inspirational stories by veteran travellers Greg Frazier (5 times RTW), Peter and Kay Forwood (193 countries), Tiffany Coates (Mongolia Mayhem) and Rene Cormier (University of Gravel Roads).
Get Ready! covers planning, paperwork, medical and many other topics! "Inspirational and Awesome!" See the trailer here!
What stuff do I need - riding gear, clothing, camping gear, first aid kit, tires, maps and GPS? What don't I need? How do I pack it all in? Lots of opinions from over 150 travellers!
break down language barriers, overcome culture shock, ship the bike and deal with breakdowns and emergencies."Just makes me want to pack up and go!" See the trailer here!
Grant demystifies the black art of Tire Changing and Repair to help you STAY on the road! "Very informative and practical." See the trailer here!
Ladies on the Loose! For the first time ever, a motorcycle travel DVD made for women, by women! These intrepid women share their tips to help you plan your own motorcycle adventure. They also answer the women-only questions, and entertain you with amazing tales from the road! Presented by Lois Pryce, veteran solo traveller through South America and Africa and author of 'Lois on the Loose', and 'Red Tape and White Knuckles.'
Cotton or synth sweat-wicking t-shirts with the cool Horizons Unlimited graphic on the front and a snappy slogan (changing every year) on the back.
Show your route on your panniers. Great conversation starter when you meet people on the road!
Motorcycle and travel books to inspire and inform you!
The definitive guide to planning your motorcycle adventure! This insanely ambitious 2-year project has produced an informative and entertaining 5-part, 18 hour video series. "The ultimate round the world rider's how-to!" MCN UK.
Linear Mode
