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HoleshotQR#24
Big Bore, Stroked & Bling +
Joined: 01 Apr 2006
Posts: 404
Location: South Australia
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Clarkie
The Day Starts With OZATV !
Joined: 26 Jan 2009
Posts: 1138
Location: Mildura VIC
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 Posted: Tue Sep 29, 2009 9:20 pm Post subject: |
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Go to your local Repco, Bursons, Autobarn etc. and get a Projecta DBC150TK dual battery isolator kit for caravans, you get them with the anderson plug kits in them so as you can charge a battery in your trailer/ caravan. I use these in my business and have one on my personal vehicle, there a great kit and easy to fit up. if you cant get one send me a PM and Ill get one out to you, Clarkie
http://www.projecta.com.au/catalogue/cid/23/asset_id/54
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noodles
Big Bore, Stroked & Bling +
Joined: 31 Mar 2006
Posts: 331
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| Posted: Tue Sep 29, 2009 9:40 pm Post subject: |
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pretty easy to make your own with just a 25 amp relay and some correctly placed wires but if your lazy like me go to homeof12volt.com.au and look at their charging kits and their 105 amp hour redback batteries for an easy setup. I might even have a spare relay setup in my shed I'll have look and bring it on the weekend unless you need it for then give me call
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say NO! to ball sports |
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Clarkie
The Day Starts With OZATV !
Joined: 26 Jan 2009
Posts: 1138
Location: Mildura VIC
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| Posted: Tue Sep 29, 2009 9:57 pm Post subject: |
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A 25a relay isnt big enough for the job as most alternators on modern vehicles will charge at least 80A to the 2nd battery,they also create a back EMF when open circuiting which in turn creates voltage spikes which in turn kills lots of stuff in vehicles with ECMs and other sensitive electrical components, not saying it doesnt work but not the best option for todays vehicles.
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Dingo555
Roostin Away
Joined: 25 Sep 2007
Posts: 778
Location: Closer to the Qld coast
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| Posted: Tue Sep 29, 2009 11:12 pm Post subject: |
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Ashdowns....Redarc Smart Solenoid part # SB112.....
12v 100amp fully automatic. When you alt. starts charging it switches on when you stop it turns off.....practically Idiotproof to fit and use 
Cost me about $70.
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noodles
Big Bore, Stroked & Bling +
Joined: 31 Mar 2006
Posts: 331
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| Posted: Tue Sep 29, 2009 11:36 pm Post subject: |
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| Clarkie wrote: | | A 25a relay isnt big enough for the job as most alternators on modern vehicles will charge at least 80A to the 2nd battery,they also create a back EMF when open circuiting which in turn creates voltage spikes which in turn kills lots of stuff in vehicles with ECMs and other sensitive electrical components, not saying it doesnt work but not the best option for todays vehicles. |
what if you only use the relay to open the circuit between two parrallel connected batteries and not straight off the alternator?
In saying that this is what i run in my car
http://www.4wdsystems.com.au/index.php?id=24
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say NO! to ball sports |
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priesty
Roostin Away
Joined: 28 Nov 2006
Posts: 645
Location: melbourne
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| Posted: Wed Sep 30, 2009 7:49 am Post subject: |
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Can any of you electrical gurus tell me if an alternator mounted on a trailer's a-frame would spin fast enough by virtue of it's impellor at say 80-100km p/hour to charge a battery ? Has anyone ever tried this ? I assume it would require an inbuilt regulator to work correctly.
Sorry if it's a stupid question, as I'm electrically illiterate, but it just seems to me that it would work.
Any thoughts ?
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The term "Foolproof" seriously underestimates the ingenuity of Fools.
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HoleshotQR#24
Big Bore, Stroked & Bling +
Joined: 01 Apr 2006
Posts: 404
Location: South Australia
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| Posted: Wed Sep 30, 2009 9:03 am Post subject: |
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cheers for the input. do you just use a standard lead-acid battery for the auxillary or should I look to get a deep-cycle or gas-sealed type? I'm intending to mount it up in a battery box with a charge indicator, isolator, 12v outlet etc from supercheap or the like.
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Clarkie
The Day Starts With OZATV !
Joined: 26 Jan 2009
Posts: 1138
Location: Mildura VIC
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| Posted: Wed Sep 30, 2009 1:29 pm Post subject: |
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| priesty wrote: | Can any of you electrical gurus tell me if an alternator mounted on a trailer's a-frame would spin fast enough by virtue of it's impellor at say 80-100km p/hour to charge a battery ? Has anyone ever tried this ? I assume it would require an inbuilt regulator to work correctly.
Sorry if it's a stupid question, as I'm electrically illiterate, but it just seems to me that it would work.
Any thoughts ? |
The load required by the alternator to charge would probably be greater than the windspeed avalible, unless you geared it down like a wind generator, I have fitted them to the tailshafts of mini sprint cars before.
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yogie
Moderator
Joined: 14 Feb 2006
Posts: 3620
Location: The Otways
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| Posted: Wed Sep 30, 2009 4:08 pm Post subject: |
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| priesty wrote: | Can any of you electrical gurus tell me if an alternator mounted on a trailer's a-frame would spin fast enough by virtue of it's impellor at say 80-100km p/hour to charge a battery ? Has anyone ever tried this ? I assume it would require an inbuilt regulator to work correctly.
Sorry if it's a stupid question, as I'm electrically illiterate, but it just seems to me that it would work.
Any thoughts ? |
if you run two 75 amp batteries, this will give you power enough for a full weeked running a fridge (engal for eg) lighting, but get a cteh charger, Grizzly put me on to those, these are fantastic.
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Clarkie
The Day Starts With OZATV !
Joined: 26 Jan 2009
Posts: 1138
Location: Mildura VIC
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| Posted: Wed Sep 30, 2009 7:41 pm Post subject: |
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| noodles wrote: | | Clarkie wrote: | | A 25a relay isnt big enough for the job as most alternators on modern vehicles will charge at least 80A to the 2nd battery,they also create a back EMF when open circuiting which in turn creates voltage spikes which in turn kills lots of stuff in vehicles with ECMs and other sensitive electrical components, not saying it doesnt work but not the best option for todays vehicles. |
what if you only use the relay to open the circuit between two parrallel connected batteries and not straight off the alternator?
In saying that this is what i run in my car
http://www.4wdsystems.com.au/index.php?id=24 |
Its the relay that creates its own voltage spike, as the electro manetic force that holds the relay shut colapses as you depower the relay, it creates its own voltage in the relay windings giving of an unregulated voltage spike, blowing up voltage sensitive stuff. Clear as mud??
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DON450
50cc nipper
Joined: 21 Jul 2008
Posts: 41
Location: IN A DITCH
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| Posted: Sat Nov 28, 2009 6:47 pm Post subject: |
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| go to a battery world get your vsr voltage sene relay an it will do all the work for you plus you want a smart charger to keep it toped up aswell!!! |
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