Would this really work?

Discussion in 'Electric Bicycles' started by s_beaudry, Nov 4, 2008.

  1. s_beaudry

    s_beaudry Member


  2. will_start

    will_start Member

    I thought it was some sorta new golf-club at first.
    Here's the text of the ebay ad.
    How would you use this on a bike, dare I ask ?

    This is a brand new single phase (1 ph) converter for AC operation of DC motors. It converts AC current to DC so you can run low cost treadmill, Ametek and other DC motors for compressors, pumps ECT. Convert any voltage from 0 volts up to 180V AC to DC current. For instance convert 48V AC to 48V DC, 24V AC to 24V DC, 120 AC to 120 DC and 180V AC to 180V DC. Any voltage can be converted to its corresponding DC voltage up to 400V DC. Its maximum ampere rating is 35 Amp at any voltage up to 400V. This converter will not alter voltage, it changes current from AC current (Amps) to DC current only. DC wire are connected to the tabs with the + and - signs next to it as shown in the picture. AC wire can be wired with no difference to which AC tab each AC wire is connect to. The two pictures illustrate hookup of converter, the second item in the picture is a heatsink which should be attached as shown in the second picture. The heat sink keeps the device cool. The red (wire) is connected to the positive DC tab and the green lead (wire) to the negative tab. DC tabs has + sign for positive DC wire and a – sign for negative DC wire. The AC wire which is all black, wire leads connection is interchangeable on the converter tabs as shown. When working with electricity proper precautions must be taken.
     
  3. s_beaudry

    s_beaudry Member

    First let me say that I am in need of a generator alreafy, so there is no lost expense here in this cost...


    I was thinking of building a new push trailer and throwing around an idea of running it as a gas hybrid.

    I was looking at mounting this generator to a small push trailer I would build

    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=120321766309

    It produces 120 volts and a continuous 1000 watts at a very low ~61 or so decibals.

    I would mount a 24v 500 to 750 watt DC motor running off the generator by means of the convertor (AC to DC)

    Just looking for feedback on this, if it is feasable or not to do??
     
  4. HI,

    I like your idea about a hybrid system and I admit I am NOT an electrical guru BUT
    a 750 Watt motor will draw upwards of 31 amps at 24V...Maybe even more as the motor nears stall.....

    That little converter does not look beefy enough to me (I did some searching on the net for AC to DC converters and there were some pretty large substantial units out there for way more $$, that did not even approach 30A capacity).

    I don't want to rain on your parade and would love to see you get something working but I'd hate to see you just toss the $$ away on that piece.... BUT then again they claim it works and it really isn;t too much $$ just to see....decisions decisions!

    Just my opinion for what it's worth....maybe a real guru could step forward? ;-O

    Hope this helps you....Good luck in your build....Please keep us posted... sounds interesting!

    Andrew
     
    Last edited by a moderator: Nov 4, 2008
  5. SirJakesus

    SirJakesus Guest

    This sounds right to me, I'm not a total electrical guru but they make no claims as to amperage (current) and only voltage. Ebikes need a lot of current to run their motors since they're pulling so much weight. In mechanical terms think about it this way. You can get an RC nitro engine that will rev out to say 20,000 rpm (voltage) BUT it has so little horse power (current) that it couldn't move anything more than a few lbs. Then you take your normal 50cc 4 stroke thats producing much less RPM (voltage) but has tons more HP (current) to move a larger load.
    I hope I didn't confuse you more with my explanation. It would be much wiser to use a pure DC output from a generator rather than trying to convert it, every conversion whether its a gearing change in mechanical things or a voltage change in electrical is always at a loss, and usually produces some friction or heat that has to be dissipated.
     
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