Search:

Type: Posts; User: ggunn

Page 1 of 8 1 2 3 4

Search: Search took 0.04 seconds.

  1. Thread: PV software

    by ggunn
    Replies
    18$$
    Views
    292

    One doesn't, but I think he sees it now. ...

    One doesn't, but I think he sees it now. http://forums.mikeholt.com/showthread.php?t=170392
  2. With a better understanding of three phase power...

    With a better understanding of three phase power you'll see that there really aren't all that many unique variations.

    With a three phase 4 wire 480/277 service you would combine the inverters'...
  3. I am glad to hear that I haven't offended you....

    I am glad to hear that I haven't offended you. Three phase power is strange to everyone at first; I have a BSEE and it was mindbending to me when I first had to deal with it.

    I think if you were...
  4. Here is one place you could start:...

    Here is one place you could start:
    https://en.wikipedia.org/wiki/Three-phase_electric_power
  5. I think the larger issue is that anything on the...

    I think the larger issue is that anything on the other side of the meter/disconnect is the POCO's issue to deal with. He can get a three phase 480/277V or 208/120V service from them, to which he can...
  6. No, they don't. 480/277 is always three phase....

    No, they don't. 480/277 is always three phase. That's what the two numbers mean - 480V phase to phase and 277V phase to neutral. 277V X sqrt3 = 480V; that's because the THREE phases are 120 degrees...
  7. No. Seriously, no. You CANNOT connect a three...

    No. Seriously, no. You CANNOT connect a three phase inverter to three different services.
  8. Because no matter what you do with transformers...

    Because no matter what you do with transformers you cannot connect a three phase inverter to a single phase service. A three phase high leg service, maybe; it depends on the size of the B phase...
  9. Beat me to it. Look at the entire cost of the...

    Beat me to it. Look at the entire cost of the project rather than just a differential in one of the components.
  10. I think that what he is saying is that you cannot...

    I think that what he is saying is that you cannot connect a single inverter to multiple services. I ask again: why are you so dead set on three phase inverters? A three phase inverter must be...
  11. Why are you going through all this just so you...

    Why are you going through all this just so you can use three phase inverters? There are perfectly good single phase inverters out there.
  12. Thread: PV software

    by ggunn
    Replies
    18$$
    Views
    292

    I have some friends who have a small solar...

    I have some friends who have a small solar operation which is a franchise of a much larger operation. They buy some of their materials through the larger op and get price breaks because of the buying...
  13. Replies
    3$$
    Views
    183

    Normally with a grid tied system when there is a...

    Normally with a grid tied system when there is a generator the solar is interconnected outside the transfer switch so that when the grid goes down and the generator starts up there is no danger of...
  14. I doubt seriously that the POCO is going to let...

    I doubt seriously that the POCO is going to let you interconnect a three phase inverter to three services, if that is what you are saying.
  15. Thread: PV software

    by ggunn
    Replies
    18$$
    Views
    292

    That's understandable. Depending on the size of...

    That's understandable. Depending on the size of the company, its affiliation with a "mother ship" integrator, and a bazillion other factors, everyone's cost of materials is different. Plus, prices...
  16. Thread: PV software

    by ggunn
    Replies
    18$$
    Views
    292

    It does a BOM, does it not?

    It does a BOM, does it not?
  17. Replies
    35$$
    Views
    1,259

    Listen but verify.

    Listen but verify.
  18. Thread: PV software

    by ggunn
    Replies
    18$$
    Views
    292

    I apologize for the diversion, but you touched a...

    I apologize for the diversion, but you touched a hot button of mine. After not using it for more than a year, I subscribed (you cannot buy it any more) to Adobe Acrobat Pro, now called Acrobat DC....
  19. 12869

    12869
  20. Replies
    35$$
    Views
    1,259

    As I said, sometimes... :D

    As I said, sometimes... :D
  21. Replies
    35$$
    Views
    1,259

    Sometimes, yes, but sometimes it's not important...

    Sometimes, yes, but sometimes it's not important which thing you did fixed it. Sometimes it's more important just to get it fixed and get on to the next task, especially when the verification process...
  22. Thread: transformer

    by ggunn
    Replies
    11$$
    Views
    456

    Don't the secondary currents and voltage...

    Don't the secondary currents and voltage determine the kVA for the two cases?
  23. Replies
    6$$
    Views
    418

    That's not the problem it used to be back in the...

    That's not the problem it used to be back in the 1970's. Aluminum for conductors is now alloyed with other metals so that its coefficient of thermal expansion more closely matches that of copper.
  24. I know this sounds cynical, but are you willing...

    I know this sounds cynical, but are you willing to risk your job over this?
  25. Replies
    28$$
    Views
    1,064

    I don't see how it could be anything other than...

    I don't see how it could be anything other than static electricity. Someone in a car on rubber tires has no path to ground and could not be part of a circuit even if the pad were energized. Don't...
Results 1 to 25 of 200
Page 1 of 8 1 2 3 4