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Type: Posts; User: ggunn

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  1. Replies
    12$$
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    497

    As in, they can refuse to pass inspection on a...

    As in, they can refuse to pass inspection on a system that has more than one backfed CB in a panel.
  2. Replies
    12$$
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    497

    Many AHJ's will not allow you to have more than...

    Many AHJ's will not allow you to have more than one interconnect point in a service panel.
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    6$$
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    355

    Also, if there are time of use variations in the...

    Also, if there are time of use variations in the electric rate, it may be advantageous for the array to be pointed more to the west. Here in Austin we do not have TOU (not yet, anyway), so it's not...
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    8$$
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    444

    Obviously I did not do the math. :D When I...

    Obviously I did not do the math. :D

    When I was doing residential PV systems we frequently got calls from folks with large homes who told us that they wanted to "get off the grid". When we told...
  5. Replies
    8$$
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    444

    And once you figure the battery amp-hours you...

    And once you figure the battery amp-hours you need to power the load, double it so that your battery state of charge stays above 50%.
  6. In general you do not want the PV inverter and...

    In general you do not want the PV inverter and the generator live to the protected loads panel at the same time. While it is possible under some conditions and with the right hardware to operate the...
  7. Thread: PV only service

    by ggunn
    Replies
    28$$
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    549

    I know we aren't supposed to use a CB that has...

    I know we aren't supposed to use a CB that has line and load distinctions stamped on it for interconnecting PV, but I have never seen one. I assume they exist.
  8. Thread: PV only service

    by ggunn
    Replies
    28$$
    Views
    549

    Of course. Did someone mention a CB?

    Of course. Did someone mention a CB?
  9. Thread: PV only service

    by ggunn
    Replies
    28$$
    Views
    549

    Perhaps I misinterpreted what you said. I was...

    Perhaps I misinterpreted what you said. I was replying to this: "...the PV System will be connected to the supply side." The fuses on a disco are on the load side of the switch. Whether the disco is...
  10. Thread: PV only service

    by ggunn
    Replies
    28$$
    Views
    549

    Do you really want to install fuses on the hot...

    Do you really want to install fuses on the hot side of the switch?
  11. I had a crystal radio set as a kid; same...

    I had a crystal radio set as a kid; same principle, I guess.
  12. That hurts my teeth just to think about it. Over...

    That hurts my teeth just to think about it. Over the years I have had most/all of my silver fillings replaced, but I still remember how it feels to bite down on a piece of foil with silver fillings....
  13. Replies
    52$$
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    2,076

    Actually, it's both.

    Actually, it's both.
  14. I guess I am confused. It is typical for a...

    I guess I am confused. It is typical for a utility to want a lockable AC disco between the inverter and the interconnect, but the power to the building doesn't go through it. It just needs to be...
  15. Replies
    3$$
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    278

    You must run a neutral to that inverter for it to...

    You must run a neutral to that inverter for it to operate, but it's just for voltage sensing. It can be sized to match the size of the EGC but no smaller.
  16. Yes, grounding is indeed Black Magic. :D But...

    Yes, grounding is indeed Black Magic. :D

    But irrespective of that, I do not believe the NEC has any business dictating that wiring methods take "EM sensitivity" into account. If someone claims to...
  17. Thread: copper thefts

    by ggunn
    Replies
    36$$
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    2,310

    That wasn't the case; it was thievery. The...

    That wasn't the case; it was thievery. The utility had nothing to do with the removal of the conductors. I am not sure who had to pay for their replacement.

    The thieves (or possibly other thieves)...
  18. Thread: copper thefts

    by ggunn
    Replies
    36$$
    Views
    2,310

    There is a theatre here in town that was vacant...

    There is a theatre here in town that was vacant for a while. When the new tenants came to move in they found that the overhead lines from the pole mounted transformer to the building were gone.
    ...
  19. Then don't. Wire the house however you see fit. ...

    Then don't. Wire the house however you see fit.

    It is not the job of the NEC to force compliance to standards based on unproven theories. Just because someone thinks demons reside in electrical...
  20. Replies
    27$$
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    865

    OK, then see the definition of ampacity in the...

    OK, then see the definition of ampacity in the NEC, and then tell me what the temperature rating is for bare copper. I couldn't find it.

    Of course there is some current value for which the copper...
  21. Replies
    4$$
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    361

    My Southwire Vd iPhone app says you will need #1...

    My Southwire Vd iPhone app says you will need #1 Al or #3 Cu for single strings at 1900' 434VDC (Vmp) and 8.7ADC (Imp), but most AHJ's will let you string it to 1000V these days. You definitely want...
  22. OK, but my question is: Where do you draw the...

    OK, but my question is: Where do you draw the line?



    The evidence for global climate change is far more compelling.
  23. Replies
    27$$
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    865

    You do understand, don't you, that ampacity...

    You do understand, don't you, that ampacity relates to the temperature rating of an insulator on a conductor and not the metal wire itself? I don't think the word even has meaning for bare conductors.
  24. OK, but where is the end to that? If we were to...

    OK, but where is the end to that? If we were to write into the code proscriptions against everything that someone thinks might be a risk, we would end up with a document which is much larger and even...
  25. Such as?

    Such as?
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