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  1. Replies
    10$$
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    247

    Not sure your letter speaks directly to the...

    Not sure your letter speaks directly to the issues at hand. The real issue here, and intent of the code, is that DC and AC circuits not share raceways. (An exception might be a gutter or other...
  2. Thread: 690.47

    by jaggedben
    Replies
    7$$
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    180

    First, the technical distinction is between...

    First, the technical distinction is between grounded and ungrounded DC systems. Enphase's latest line of inverters, for example, are ungrounded but also have a transformer in them.

    My...
  3. Thread: 690.47

    by jaggedben
    Replies
    7$$
    Views
    180

    Maybe, but not really. 690.47(A) you have...

    Maybe, but not really.

    690.47(A) you have correct.

    690.47(B): If you ask me, it should consist of only the first paragraph, and the rest of it (referring to inverters) should be moved to...
  4. Replies
    33$$
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    2,115

    The idea is that in an emergency someone should...

    The idea is that in an emergency someone should be able to shut off power to a building quickly and simply.
  5. Replies
    10$$
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    247

    How can inverter output circuits not be in the...

    How can inverter output circuits not be in the same raceway (etc.) as inverter output circuits? :lol:

    FWIW, the blue part is only in the 2104 code, not the 2011. Maybe he hasn't seen it yet, and...
  6. Replies
    3$$
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    201

    Sorry for bad formatting, this should be more...

    Sorry for bad formatting, this should be more readable...



    Yes. You cannot protect the #12 wire with a 40A OCPD. Consult the trunk cable manufacturer's info for the max OCPD size and max...
  7. Replies
    3$$
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    201

    You don't need both the fused disco and the 40A...

    You don't need both the fused disco and the 40A breaker. You could go with an unfused disco, or perhaps no disco at all if not required by the AHJ or utility.

    [/QUOTE]The questions I have are:
    ...
  8. Back with the books... So yes, that's the way...

    Back with the books...

    So yes, that's the way they wrote it in 2011. And clearly they screwed up, because if you look at 2014 they fixed the language with respect to marking and suitability. ...
  9. To be fair, a vast number of residential rate...

    To be fair, a vast number of residential rate structures assume the same thing for ratepayers without DG.
  10. Replies
    59$$
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    2,103

    The SF Bay Area is dozens of jurisdictions that...

    The SF Bay Area is dozens of jurisdictions that are all quit different from each other.

    In SF itself I think they are pretty lax on AFCI, at least if it's not new construction. We've had many...
  11. LOL :lol:

    LOL :lol:
  12. Do the requirements in 690.31(G) not make it safe...

    Do the requirements in 690.31(G) not make it safe enough? By all means if you think that the disconnect makes things so much safer that you just feel you should install it no matter what, then...
  13. I think perhaps the problem here, PVfarmer, is...

    I think perhaps the problem here, PVfarmer, is that you don't understand how a grid-tie inverter actually works, and how much energy goes where, and when.
  14. I don't see how your getting that from the...

    I don't see how your getting that from the language of the code. It's just not written that way. To my mind, the idea is that it's not safe to run PV circuits inside of buildings unless a) they can...
  15. 690.12 doesn't nullify any requirements in...

    690.12 doesn't nullify any requirements in 690.13. I suppose one could argue that if the Rapid Shutdown control is readily accessible, and results in disconnecting the conductors at a location that...
  16. Yes. Edit: Note that the exception has a...

    Yes.

    Edit: Note that the exception has a misprint in the printed version. It's supposed to refer to 690.31(G), not (F). Refer to previous codes for corroboration. I don't know if the NFPA has...
  17. Well, it affects the LCOE of PV, among many other...

    Well, it affects the LCOE of PV, among many other factors. But for the purposes of this discussion we state the PV LCOE as a given and leave it at that.
  18. He made them up. It's a hypothetical example. ...

    He made them up. It's a hypothetical example.



    No, but it's 5cents per kWh than the 'actual' battery in the example.
  19. Replies
    10$$
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    411

    A lot of the bonding bushing stuff has to do with...

    A lot of the bonding bushing stuff has to do with GEC requirements and readings of 250.64. When you have a large grounded inverter there may be some sense to this, but I agree it's probably overkill...
  20. And not only that, but in many places where it's...

    And not only that, but in many places where it's legal to export to the utility from PV, it's still illegal to do so from batteries.
  21. Why do they sum the meters? Why don't they just...

    Why do they sum the meters? Why don't they just charge you one set of rates for consumption and credit you for production? Or is the solar meter behind the regular meter?
  22. Fwiw, enphase announced its own battery inverters...

    Fwiw, enphase announced its own battery inverters last year, based on the same micro inverter layout and even using the same trunk cable, apparently. Now whether it has the feature you have in mind,...
  23. The only reason I mentioned storage is that I...

    The only reason I mentioned storage is that I gather that some of the commercial scale storage systems that are aimed at demand management and reducing demand charges would probably be capable of...
  24. Well, exactly. Whatever you 'aren't buying' from...

    Well, exactly. Whatever you 'aren't buying' from the grid, you are getting from the PV, and vice versa.
  25. No they are not. The PV is. (And you meant...

    No they are not. The PV is.

    (And you meant 'energy', not power.)
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