Recent Content by Minnesota

  1. Minnesota
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    Flying as of 6/30/2010

    From failure comes understanding, from understanding comes success. Hang in there Sparky (or is it Smokey?) :)
    Post by: Minnesota, May 4, 2013 in forum: Post Your Photos
  2. Minnesota
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    Windtura500 Bearings

    TomT - a video on how to change those would be cool.
    Post by: Minnesota, May 2, 2013 in forum: Windtura Generators
  3. Minnesota
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    Flying as of 6/30/2010

    Is this the smallest board size they allow? Good experience.
    Post by: Minnesota, May 2, 2013 in forum: Post Your Photos
  4. Minnesota
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    Flying as of 6/30/2010

    What establishes the 2V hysteresis?
    Post by: Minnesota, Apr 23, 2013 in forum: Post Your Photos
  5. Minnesota
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    Flying as of 6/30/2010

    Do you guys think preventing the 10-30 from activating until 16V or so is of any benefit, or is it very windspeed dependant? Perhaps Tom can make...
    Post by: Minnesota, Apr 23, 2013 in forum: Post Your Photos
  6. Minnesota
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    China Grid tie inverter"NEW" 1kw

    Josh and Tom - the overvolt/divert port is obviously a cheap and dirty way for SUN to get into the wind GTI world without a major redesign. It's...
    Post by: Minnesota, Apr 23, 2013 in forum: Start here
  7. Minnesota
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    Flying as of 6/30/2010

    Here's a good video on how to heatsink a MOSFET. (or similar part) http://www.youtube.com/watch?v=8ruFVmxf0zs
    Post by: Minnesota, Apr 22, 2013 in forum: Post Your Photos
  8. Minnesota
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    Flying as of 6/30/2010

    Larry - yes. I was exploring the idea of disconnecting the AC but that leaves the 10-30 divert MOSFETs open to see the turbine voltage. If these...
    Post by: Minnesota, Apr 22, 2013 in forum: Post Your Photos
  9. Minnesota
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    Flying as of 6/30/2010

    The IRF3710 has a junction-to-ambient rise of 62 degrees C per watt and has a max junction temp of 175C before it dies. A proper heatsink is...
    Post by: Minnesota, Apr 22, 2013 in forum: Post Your Photos
  10. Minnesota
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    Flying as of 6/30/2010

    FETs that are switching at 60Hz (like in the case of a GTI) have more losses vs those sitting there ON. If we assume 80% efficiency, running at...
    Post by: Minnesota, Apr 22, 2013 in forum: Post Your Photos
  11. Minnesota
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    Flying as of 6/30/2010

    The MOSFETs are just there to channel the power to the divert load, not to dissipate it. If you look at the other main spec on a FET, it is the ON...
    Post by: Minnesota, Apr 22, 2013 in forum: Post Your Photos
  12. Minnesota
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    China Grid tie inverter"NEW" 1kw

    Either of those FETS will work, Tom, but heat sink them well. They obviously try to use best-value parts but these sometimes prove to be...
    Post by: Minnesota, Apr 21, 2013 in forum: Start here
  13. Minnesota
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    China Grid tie inverter"NEW" 1kw

    If you're running it with just 5 ohms then it likely exceeded the MOSFET voltage rating. 100 amps x 60 v seems impossible don't you think?
    Post by: Minnesota, Apr 20, 2013 in forum: Start here
  14. Minnesota
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    China Grid tie inverter"NEW" 1kw

    Some analysis on the divert port on the 1000G. [media]
    Post by: Minnesota, Apr 19, 2013 in forum: Start here
  15. Minnesota
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    China Grid tie inverter"NEW" 1kw

    I assumed basically linear; on the 24V 60rpm=7.4v and 150rpm =24v, so (24-7.4) = 16.6V over a 90rpm range so that is 5.42 revs/volt.
    Post by: Minnesota, Apr 18, 2013 in forum: Start here