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  1. boBK7IQ

    PG&E- What are they actually shutting down?

    The sun pretty much works in California. You can make your own electricity and at least power the critical loads like refrigerator and lights.
  2. boBK7IQ

    Approval free alternate energy tie ins ??

    >>e started thinking Trace was purchased by some shady entity for the sole purpose of buying the rights of that device and crushing it. Thoughts of dark conspiracies, trench coats, hit men, lobbyists, and lawyers came to mind. Keith, Your are very close here... That micro grid tie unit was...
  3. boBK7IQ

    Approval free alternate energy tie ins ??

    Itsmoked said: >>That company was bought by Xantrex and suddenly that 'solution' disappeared over night. Which unit was that, Keith ? boB
  4. boBK7IQ

    Transformer Operation near Saturation

    > I said: >> I come from the inverter industry where efficiency and tare losses are both very important and must be optimized as much as possible. I wish I could edit posts... I should also have said that in an inverter you do NOT want to operate very far into saturation, but it should be...
  5. boBK7IQ

    Transformer Operation near Saturation

    edison123 (Electrical) 17 Sep 08 22:14 boB - Good luck putting your theory to test in practice. I have many times, and I'm sure you have too. I think that there is just a definition problem here of the word saturation. I'm merely trying to state that there is a point on the B-H curve...
  6. boBK7IQ

    Transformer Operation near Saturation

    "bobk71q Another way to operate more in the saturation region . You cannot operate more in the saturation region for all the reasons already mentioned above by jghrist, itsmoked and slavag. " Sure you can. Saturation is not just a "Yes or No" thing with soft magnetics... The B-H curve slope...
  7. boBK7IQ

    Transformer Operation near Saturation

    Another way to operate more in the saturation region is to reduce the number of turns, (increasing the volts per turn), while keeping the size of the stack the same. The reason this helps full power efficiency is because you can then use bigger wire, thus reducing copper I^2R losses. boB
  8. boBK7IQ

    Sufficiently Isolated scope

    Unfortunately those Tektronix TDS isolated scope channels are only specified to be used with somewhere around 60 or 70 volts of probe differential voltage, although before I read the specs, I used them for phase-to-phase measurements of a few hundred volts. That's why I use those Yokogawa...
  9. boBK7IQ

    Transformer's Theory question

    I think that what is happening is that the leakage inductance is not part of the magnetizing inductance, i.e. that inductance does not contribute to the flux in the core and so has a voltage drop, even without wire resistance. (I ~think~ I said that right)... However, a real transformer does...
  10. boBK7IQ

    Sufficiently Isolated scope

    I use the Yokogawa differential probe. It works great. boB K7IQ http://www.yokogawa.com/tm/dl/700924/tm-700924_01.htm

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