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Thread: SplitCharge system for audio

  1. #1
    Regular Member Whippy's Avatar
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    Default SplitCharge system for audio

    thought it might be best to ask on here.

    has anyone fitted a splitcharge system to their vec-C yet for an audio install?
    if so, was it on a vec-C with the Full Canbus and did it throw a wobbly?


    i've got this little voice in my head telling me i should check before i go mad and buy lots of bits.

    i know the system complains about silly things like led sidelights,
    so what's it going to think when i strap another battery into the equation.


    also, the splitcharge relay is going to need a feed from something that is live when only the engine is on. anyone know of any?


    thanks

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    its easy

    how much do you think you have to spend on the kit and ill tell you whats best

    the best way is 2 new batterys of the same size and type and then you dont need to splite change then

    http://caraudiosecurity.com/shop/pro...s_id/5290.html

    http://caraudiosecurity.com/shop/pro...s_id/5272.html
    Last edited by chrisgettings; 3rd March 2008 at 01:59.

  3. #3
    [Ex]Admin Duncan's Avatar
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    Purely curiosity - what's split charge?

    I'm assuming it's running the audio system, or the extra components of (amps etc.) from a separate dedicated battery, and the split charge bit is allowing both batteries to still be charged from the alternator. Is that it in a nutshell?

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    duncan you are very very close to how its done

    the split charge will keep the batteries from discharging into each other as if you have 2 batteries of diffrent sizes or types or even age of the batteries.

    or the the other way is to buy 2 of the same batteries ie size and type and there will be no discharge to the other .

    or you could just but a higher amped main battery

  5. #5
    [Ex]Admin Duncan's Avatar
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    Quote Originally Posted by chrisgettings View Post
    the split charge will keep the batteries from discharging into each other as if you have 2 batteries of diffrent sizes or types or even age of the batteries.
    Right, gotcha. So is one battery used specifically to power the amps etc., or are they (the batteries) simply wired in parallel to provide more capacity to power everything? I'm guessing the latter?

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    Quote Originally Posted by Duncan View Post
    Right, gotcha. So is one battery used specifically to power the amps etc., or are they (the batteries) simply wired in parallel to provide more capacity to power everything? I'm guessing the latter?
    yes as above but a splite charge will charge the batteries separately, so diffrent batterys car be used and no dischange will happen

    or to save money a large relay aprox 80amps or higher ,this will save you some money but discharge will still happen """"" the lesser battery pulling the new battery down to the lesser battery's level"""

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    found one for the right price for you


    http://www.yachtbits.com/sterling_po...rge_diodes.php

  8. #8
    Regular Member Ben H's Avatar
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    Chris, one big floor to your plan of not using a split charge relay between your two batteries is they will both be drained from use of the audio system whilst the engine is not running. If they become that low that when you come to start the car the starter motor will be drawing current from both the front & the rear batteries.
    If the system has been fitted correctly you will only have say a 40amp fuse fitted both front & rear to protect the power cable if in the event it gets crushed in a side impact. Once the starter motor cranks & blows the small fuse in the rear as too much current is drawn through it the rear battery will no longer charge. In a short period of time the battery will be drained and if equipment pushed hard potential damage could start occuring.
    This is the case as I know from experience. We had a customer who's split charge relays switch wire was connected to an ignition live which didn't die whilst cranking. This allowed the starter motor to draw from the rear battery thus blowing the fuse. Muppet our fitter was had connected it to the ignition coil
    I then asked him did he not think the engine needs the coil to be live whilst cranking to start

    Whippy as you said your split charge relay needs a live when engine is running but also one which dies on crank to avoid the above happening.
    On older cars it was nice and easy, something like windscreen wipers or blower motor which would briefly stop working whilst cranking.
    As for what you could use on the Vectra perhaps the old faithfull cigarette lighter might do the job.

    Duncan you pretty much have it. When the ignition is switched of the relay opens & isolates the front battery from any current draw caused by the stereo system so leaving it nice & healthy to start the car.
    There are other benefits too such as you no longer get voltage loss that you would have across a 5 metre length of cable. Instead you only dealing with 12" to 18" of cable and so very little voltage loss which can help with the dimming headlight syndrome.

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    a true splite charger dosnt need a engine run live to run the unit its picked up from the alternators voltage ..

    the 2 batteries work just as that "" 2 batteries "" and the splite charger should charge the batteries separately

  10. #10
    Regular Member Ben H's Avatar
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    Quote Originally Posted by chrisgettings View Post
    a true splite charger dosnt need a engine run live to run the unit its picked up from the alternators voltage ..

    the 2 batteries work just as that "" 2 batteries "" and the splite charger should charge the batteries separately
    So you don't have a fuse front or rear to prtoect the cable when 80 amps go through it as it's crushed against the body work in an accident



    If you have no way of isolating the rear battery the starter motor draw will blow the fuse which MUST be fitted for your intrests in safety.

    I'm not saying your way isn't a split charge system as it is it's just the question was asked with regards to a stereo system.
    After 10 years of being an ICE specialist and building various manufacturer demo cars the route of using the relay is always favoured.

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