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Thread: Capacitor & Overdriving an Alternator

  1. #1
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    Capacitor & Overdriving an Alternator

    Here's my setup:

    Compaq Mobo w/ AMD Slot A 600mhz CPU (hey it was free)
    20GB ATA 66 HDD
    128MB PC 133
    32MB AGP Vid Card
    MN-710 USB 802.11g WiFi Adapter
    Sound Blaster Sound Card
    10.4" Planar VGA LCD (max res. 800x600)
    MS Elite Pro Keyboard
    MS Mouse
    3Com Webcam mounted to Roof

    600 Watt Power Inverter

    MP3-Car pc has been built, tested and ran. Problems with low inverter output were encounter while stopping in traffic, & backing up; These problems were augmented @ night when headlights were on. Also my SU-700net UPS refuses to filter the inverted power from the car, it sees it as too low (for the most part) and instead runs solely on the battery. No problems were encountered when running the entire system solely from the power inverter.

    I'll be purchasing a mid-end battery backup for the Car-PC due to the fact that the APC-SU700net doesn't like the inverted power, and I basically just need something to pick up when the inverter decided to power off when I stop @ a light/stop sign & the rpms drop below 1200 rpm and the voltage drops accordingly. I'm tempted to invest in a 1/2 or 1 farad capacitor to rectify the voltage drops when I clutch the car.

    I am thinking I can put an underdrive pulley on the 63 Amp alternator, but what I'd really like is some type of belt-drive governor that keeps the RPM's UP @ low speeds, and keeps them normal @ high speeds (engine rpm speeds, not actually MPH).

    I've also yet to actually install the extra 63 amp alternator, the time I ran the MP3-Car pc setup was only on the stock alternator.

    Does anyone think a Capacitor would help with the voltage drop when coming to stops?

    Has anyone ever seen any type of clutch/governor that would do what I'm wanting to do with the extra alternator? (keep it going fast @ sub 1500rpm speeds, and not overdrive it above that rpm?)

    I paid extra when I got the alternator, it's got a lifetime warranty, so it's not really a big problem if over-driving it does eventually burn it up. I figure either the brushes will go first from the increased wear @ higher operating RPMS, OR the diodes will burn out from high rpms, and heat load. (operating it @ higher rpms and originally intended in order to compensate for Voltage drop @ idle).
    If you're not paranoid, then you're not paying enough attention. -kmfdmk.com
    http://www.mymp3car.com/MP3Car/PSUpower.asp

    1985 Supra 7M-GTE
    10.4" Planar LCD
    ECS GOAL3+ mobo w/ 512mb + 8GB sdhc
    Edimax EW7318USG Wifi w/ 7 db Ant.
    USB GPS

  2. #2
    Constant Bitrate LeoTheHamster's Avatar
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    Kings Lynn, Norfolk, UK
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    Don't bother with a capacitor, there next to useless (unless you want to hit someone round the head with something, then it could be quite handy....)

    Have a look at Xstatic Batcaps. They discharge as quick as a cap, which is what you want, but have the storage capacity of a battery, instead of the "blip oh was that it" from a cap

    Heres a link so you can have a look. However, as I'm in the UK I don't know where you can source them over the pond http://www.caraudiodirect.co.uk/adva...atcap&x=10&y=7
    Leo

    http://www.talkaudio.co.uk

    A million people can't be wrong, right?

    Well... unless they're all from the red states...

  3. #3
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    Feb 2003
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    SE Ohio
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    Cool, thank you I'll look into it. If it turns out it's just what I need, I don't have a problem ordering stuff overseas. Just goes to show America doesn't have everything despite what we as a nation may think.

    However it appears that it's a rather expensive solution for me:

    http://www.caraudiodirect.co.uk/product_info.php?products_id=3722&osCsid=86bd70e4e 0bc208c9871b85e45bf99dc

    395.646 Watts for Five Minutes = 28.67 Amps * 13.8 volts.

    It would be just what I needed however the price is 360.853 USD. Not to mention I'm unsure if they even provide overseas shipping.

    For that price I might simply invest in a modified 2 battery 2 alternator solution.

    Stock Alternator - Runs Car & Amps for Stereo + Charges Stock Battery
    Extra Alternator - Charges Xtra Battery, and Provides Operating Power for PC

    Put in a switching system that makes the PC run off of the Extra Alternator @ voltages above 13 volts, and automatically switches to the Extra Battery when Extra Alternator voltage drops below 13. This shouldn't be too difficult to cobble together, and since it only happens for short 2 - 3 minute periods of time I shouldn't have a problem.

    I've also yet to try the setup in my new Car, my Supra is a Manual, the old car I tested the same setup in was an Auto.

    Also the simplest solution is to simply adjust the fast Idle up from about 600rpm to around 950rpm, though this means more engine wear, and less fuel economy. (psh like I care.. it's a sports car)

    OH YEAH, another cool though slightly more tricky setup would involve a solenoid that is ON when the PC is powered ON. This solenoid would *increase* the minimum idle of the engine to about 1200rpm, that way the IDLE is increased *only* when the PC is on & requires the higher RPMS.
    If you're not paranoid, then you're not paying enough attention. -kmfdmk.com
    http://www.mymp3car.com/MP3Car/PSUpower.asp

    1985 Supra 7M-GTE
    10.4" Planar LCD
    ECS GOAL3+ mobo w/ 512mb + 8GB sdhc
    Edimax EW7318USG Wifi w/ 7 db Ant.
    USB GPS

  4. #4
    Constant Bitrate LeoTheHamster's Avatar
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    Kings Lynn, Norfolk, UK
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    As far as I know they don't ship overseas, but you could always ask them nicely I've met the guys who run the place and have dealt with them many times before, top blokes
    Leo

    http://www.talkaudio.co.uk

    A million people can't be wrong, right?

    Well... unless they're all from the red states...

  5. #5
    Constant Bitrate
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    Sep 2004
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    bakersfield, ca
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    you can get batcaps on ebay, or just do a search for it on find their website, and you can order from them directly. They are located in Alabama....batcaps good stuff.

  6. #6
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    Feb 2003
    Location
    SE Ohio
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    AC Fast Idle

    I just thought of something. Since I'm removing the AC Compressor to install the extra alternator, I can use the same switch as the AC to turn on the fast Idle.

    I would assume that the Supra has a fast idle for when the AC is on hehe I can just drive around with the AC turned on.

    brb going to go pop the hook on my car.
    If you're not paranoid, then you're not paying enough attention. -kmfdmk.com
    http://www.mymp3car.com/MP3Car/PSUpower.asp

    1985 Supra 7M-GTE
    10.4" Planar LCD
    ECS GOAL3+ mobo w/ 512mb + 8GB sdhc
    Edimax EW7318USG Wifi w/ 7 db Ant.
    USB GPS

  7. #7
    Variable Bitrate choyak's Avatar
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    Jun 2004
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    Buena Park, CA
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    Quote Originally Posted by kmfdmk
    Just goes to show America doesn't have everything despite what we as a nation may think
    www.batcap.net

    Just goes to show what a little web digging can do. The batcap is made in Dothan, Alabama!
    Carputer currently 'ghettoed' into car!!!

    EPIA MII-12000
    Ampie Case with rigged extra USB
    Hitachi 60GB
    Holux GPS mouse with iGuidance 2.0
    Lilliput 7" touchscreen
    Netgear WG121 USB WiFi
    Carnetix P1260

  8. #8
    Constant Bitrate
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    yo go check your ground, or try running the inverter straight off the front(battery) of your car. What gauge wire are you running to the back of the car? A bad ground will decrease the voltage and make your inverter shut off.
    Compaq v6719 Athlon X2 tk-57
    Xenarc 7" Dash Install, iGuidance w/ iGPS 500
    HD Radio, Powermate, ShuttleXpress, XMDirect, DC/Auto turn on, Pioneer TS-C720PRS, 2 12" MTX BTE's, JL 500/1 and RBC

    94.3% of all percentages are made up

  9. #9
    Newbie impulsenine's Avatar
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    What, then, is the minimum Amperage recommended for these crazy systems? I've done some searching around the boards and haven't found a straightforward answer. The biggest I've found for my car ('62 VW) is 75 Amps, which is going to be charging 2 batteries. [One battery is for the car's important things like spark plugs and lights, and the other is for all the fluff; both are also trickle-charged via solar. They are also separated so that one can't drain power from the other.]
    You are all guilty of feeding the drug habit I have: obsessing with my car. Damn you!!

  10. #10
    Maximum Bitrate binary.h4x's Avatar
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    Before you buy more parts, I think you should re-check your current system. I find it really hard to believe that your compaq is drawing so much power that it requires these upgrades.
    2007 Honda Fit Sport 1.5L SOHC-VTEC

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