Search:

Type: Posts; User: ggunn

Page 1 of 8 1 2 3 4

Search: Search took 1.95 seconds.

  1. Replies
    31$$
    Views
    668

    When he manages to kill himself I hope the camera...

    When he manages to kill himself I hope the camera is rolling. :D
  2. Replies
    24$$
    Views
    661

    I don't see why; there's no money in it to speak...

    I don't see why; there's no money in it to speak of.
  3. Replies
    19$$
    Views
    534

    When I was working in the semiconductor biz, a...

    When I was working in the semiconductor biz, a problem came up when a new version of a chip was being designed while I was out on vacation. The product engineers had determined that the chip had to...
  4. Replies
    19$$
    Views
    534

    That is AMAZING!! You made a case of beer last...

    That is AMAZING!! You made a case of beer last TWO WEEKS??? :D
  5. Replies
    24$$
    Views
    661

    You don't do solar, right? If you did you would...

    You don't do solar, right? If you did you would realize how silly that sounds to those of us who do. The last thing any of us want to do is go back to systems we have built to wash panels when we...
  6. Replies
    48$$
    Views
    1,286

    A house burned across the street from a friend of...

    A house burned across the street from a friend of mine. The fire investigator told him that a bathroom fan had a bad connection that developed into a resistive fault that caught fire. A fault like...
  7. Replies
    20$$
    Views
    271

    How far (as the wire flies) is your inverter from...

    How far (as the wire flies) is your inverter from your service? What size conductors are the AC conductors for this run?
  8. Replies
    20$$
    Views
    271

    #6 sounds awfully small to me for service...

    #6 sounds awfully small to me for service entrance conductors.
  9. Replies
    20$$
    Views
    271

    Maybe, maybe not. What he is probably...

    Maybe, maybe not. What he is probably experiencing is voltage rise due to voltage drop between his inverter and the grid source of power. It could be as simple as his conductors to the service being...
  10. Replies
    20$$
    Views
    271

    You can get into the Sunny Boy's controls and...

    You can get into the Sunny Boy's controls and open up that voltage range a bit. You'll need to get SMA customer support to help with it because that parameter is not something you can easily get to....
  11. That's why most PV installers have a boatload of...

    That's why most PV installers have a boatload of it in the truck. :D
  12. I've got a boatload of #10 in the truck. Will...

    I've got a boatload of #10 in the truck. Will that work? :D
  13. Replies
    6$$
    Views
    228

    That looks like a 100A service to me. If it is...

    That looks like a 100A service to me. If it is 240V split phase with a 100A breaker on each phase, it's most likely a 100A service and your PV is limited to 20A.
  14. Oh. CT's do not feed the busbars, so they do not...

    Oh. CT's do not feed the busbars, so they do not contribute to the electrical feed to the panel (i.e., the 120% rule). Installing CT's in panels is a very common practice and does not violate the NEC...
  15. Is the system so small that a transformer on its...

    Is the system so small that a transformer on its output would even fit inside a load center? And what do you mean by the term "module"?
  16. Thread: PV Solar Farm

    by ggunn
    Replies
    2$$
    Views
    145

    ...and not tied in any way to the amount of...

    ...and not tied in any way to the amount of energy the system produces and/or is sold to the utility.
  17. Replies
    48$$
    Views
    922

    It is different. A PV module is a virtual current...

    It is different. A PV module is a virtual current source over most of its IV curve; lowering the load resistance does not draw more current once you get past the knee of the curve. That's more than a...
  18. Replies
    48$$
    Views
    922

    You see? There's no problem. :D

    You see? There's no problem. :D
  19. Replies
    48$$
    Views
    922

    So far I am batting 1000 for AHJ's not even...

    So far I am batting 1000 for AHJ's not even questioning how much I overload inverters. As long as my conductor sizes are correct for the derated Isc of my array, they are happy.

    There is nothing...
  20. Replies
    48$$
    Views
    922

    Addendum: Of course, this does not relieve the...

    Addendum: Of course, this does not relieve the designer of the requirement to size DC conductors to the correct ampacity with respect to STC Isc for the array.
  21. Replies
    48$$
    Views
    922

    Right. An array on a rooftop in Canada with a 5...

    Right. An array on a rooftop in Canada with a 5 degree tilt and pointed due west, for example, is never going to produce anywhere near its STC DC rated Isc. There is no reason to limit the...
  22. Replies
    48$$
    Views
    922

    In some locations and orientations it is fairly...

    In some locations and orientations it is fairly routine to load inverters to 150% DCW STC to ACW. Since voltage is what it is, that overload is all Isc. In some AHJ's that ratio is limited...
  23. Replies
    48$$
    Views
    922

    Maybe I am misunderstanding you, but GT inverters...

    Maybe I am misunderstanding you, but GT inverters are overloaded quite frequently where the maximum input current the inverter can take is significantly lower than the STC Isc of the array. As long...
  24. Replies
    21$$
    Views
    656

    Maybe this is a minor point, but the OCPD at the...

    Maybe this is a minor point, but the OCPD at the interconnection point on a PV system is not there to protect the main supply from the inverter(s). In a properly designed system the inverter(s)...
  25. Replies
    141$$
    Views
    5,721

    Where is that ignore button? Ah yes, there it is....

    Where is that ignore button? Ah yes, there it is. Goodbye.
Results 1 to 25 of 200
Page 1 of 8 1 2 3 4