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 sleeper
Wolfsburg Wizard
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| posted on June 25th, 2003 at 03:27 PM |
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converter wiring???please help....
hi guys,
am about to install a stereo in my oval(still 6v) but am gonna instal a converter from 6v to 12v as the sound system will run on a 12v battery and the
converter will charge the battery....just wondering how to do the wiring, it has 3 cables from the back of the converter,a black, a red with a fuse,
and a blue one.....where do i wire them to and where do i wire the 12 v battery????any ideas?any electricians out there that could do a sketch for me
to do my wiring? anyone on the gold coast will be able to help me?
cheers...
D |
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sleeper
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 posted on June 25th, 2003 at 05:58 PM |
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please help !!!! |
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Old Dubber
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| posted on June 25th, 2003 at 07:00 PM |
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D
I'm confused?
I know there is an "inverter" to give you 12volts from your 6volts. So why do you need a 12 volt battery?
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sleeper
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| posted on June 25th, 2003 at 08:23 PM |
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old dubber,
sorry ,you are right it is an inverter to get 12v from the 6v battery, it will be used to charge the 12v battery that i'll use to run my sound
system...does it make sense?
cheers |
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KruizinKombi
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| posted on June 25th, 2003 at 10:53 PM |
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It makes perfect sense, in certain conditions....
If your stereo has a high power draw (High volume, big amps, subwoofers) then the converter may not be able to keep up with the short peaks of high
power draw. Most inverters have a peak rating considerably higher than there constant rating though, so you need to determine if it is in fact
necessary.
Even if it is not necessary for the above reason, there is still another advantage... the inverter should prevent current flowing from the 12V battery
back into the 6V battery (check that it does), which effectively creates a dual battery system - one to perform the usual functions in a car, and
another seperate system to run the stereo. Even if the stereo is left on and the 12V battery goes completely flat, the 6V battery will still start the
car PROVIDED that the 6V battery does not power the inverter unless the engine is running (generator/alternator) is charging. This can be achieved
cheaply by placing a relay in the power supply to the alternator, switched by the field wire of the generator, DF (I think, I can check if
necessary).
There is another problem... check the output voltage of your inverter. 12V auto electrical systems generally charge at between 13.5-14.5 Volts. If
your inverter's output is only 12V then your 12V battery may not charge fully.
As for your original question. The black wire is obviously going to be the earth. The red wire is going to be power, but it is difficult to tell
whether it is power into the inverter or power from the inverter.
Chances are that the inverter should have its own thermal overload circuit, which should protect it from high current draws, making a fuse
unnecessary. The fuse is more likely to be there to prevent damage caused by voltage spikes on the input side, which would make the red fused wire the
power supply (connected to the accessories or ignition power supply), and the blue wire should be the positive out (to the positive terminal on the
12V battery).
Don't take my word for it though, check with somebody who knows what they are talking about, please! :thumb
Kruizin Kol
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sleeper
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| posted on June 26th, 2003 at 12:30 AM |
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kruizin combi,
that was quite informative and interesting at the same time, thank you.
after looking into the inverter i figured out that the red with the fuse will go on the positive of the 6v battery, and the box being bolded on floor
will be the ground ,the black is the negative for the 12v battery and the blue the positive for the 12v battery.
so by doing so.... 6v battery - inverter - 12v battery do you think i will need to do anything else? like you said if my 12v battery goes flat will
the 6v still be running with that setup? i'll go to a car electrician and ask him what his opinion is and let you know of the "expert
response"
cheers. |
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KruizinKombi
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| posted on June 26th, 2003 at 02:31 PM |
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I'm not sure, sleeper. Is it actually an inverter, or is it a transformer?
An 'inverter' is generally used to change Direct Current of a given Voltage, into Alternating Current of the required Voltage. From what you
have described so far, yours seems to be DC to DC, in which case it is possibly a transformer.
A transformer can pass current both ways, which would allow the 12V battery to drain your 6V battery unless you disconnect something whenever the
alternator/generator is not charging.
You could get away with simply powering the inverter through the ignition circuit, so that the inverter switches off whenever the engine does. Your
stereo would still run from the 12V battery regardless.
Better still, you could use the power from the ignition circuit to trigger a relay, and take the power for the inverter straight from your 6V battery,
which would place less strain on the existing ignition wiring.
Its all a matter of how far you want to take it, and how much time and money you want to spend. There are better systems available which are virtually
idiot proof and protect your starting battery perfectly, but a simple relay should be fairly effective at a small price.
Can I also suggest that you use a Deep Cycle battery for the 12V. These are much better suited to constant current draw, such as for running a stereo.
They can also handle being run completely flat better than a standard lead-acid battery. :thumb
I'm still a bit concerned about the output voltage of your inverter though. Is it actually 12V? Can you connect it temporarily and test the
output voltage? Ideally you want 13.5V or so to charge a 12V battery.
Kruizin Kol
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aussiebug
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| posted on June 26th, 2003 at 05:26 PM |
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KruzinKombi,
Errr - ummm - a transformer works with alternating current only - it won't work with the DC a battery provides.
DC/DC Inverter or "voltage converter" is the correct term.
The deep cycle battery for a second battery is a good idea - it will withstand going flat without destroying itself like an auto-battery can (auto
batteries HATE going flat).
Good point about the need for more than 12v to charge a 12v battery.
I've emailed with sleeper (Daniel) about this topic and forgot that point.
I'm wondering why he NEEDS a second battery at all though - so long as the power requirements of the 12v radio are within the specs of the
inverter, he should be able to run the 12v radio direct off the inverter - that's the usual method used in the past for 6v bugs.
I came across a simpler system a while ago too - a guy with a 6V bug had a second battery (12v) under the seat for his modern radio/CD and didn't
bother with any charging method - he connected a bench charger to the 12v battery each weekend. It worked, because the radio/CD was not a boom box
but more modest - it used about 3 amps, so the battery had about 15 hours operation before going flat (50amp/hour battery).
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KruizinKombi
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| posted on June 26th, 2003 at 10:22 PM |
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Thanks Rob, I'm not really up on the terminology, but I was thinking along the lines of two coils, one powered by the 6V, creating current in the
other via magnetic induction. That is a transformer, isn't it?:alien
If we're talking about the best way to do the job, I'd be changing the whole car to 12 Volt.
Kruizin Kol
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sleeper
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| posted on June 27th, 2003 at 01:38 AM |
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thanks guys,
i agree that i should change the car to 12v but that willl come with my full restoration....sometime.....as far as that inverter, i wanted or thought
that i couls connect the stereo on a 12v battery and use the inverter to charge as to avoid having to charge every weekend or so that is it but if you
tell me that i can simply hook up my stereo onto the inverter well that makes thinks easier i guess but will it give enough juice for the head unit,
amp,sub and 6" .....that is why i though a 12v would be the go that is it....all that is getting very complicated for me as i am not quite an
expert in that field...thanks for the replies....
thanks again rob, didn't realise you were actually on this forum too |
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Herbie
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| posted on June 27th, 2003 at 01:09 PM |
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Heres an Idea, I bought one of these so I never have a flat battery, I bought it more for my GSXR 1100 suzuki as I dont get to ride it often enough to
keep it charged,
I would buy one of these solar chargers, {genuine VW accessory} and link it to a separate 12 volt deepcycle battery.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&categor...
62 Ragtop Herbie with a little extra oomph.
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