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  1. Thread: battery

    by ggunn
    Replies
    3$$
    Views
    200

    Also, once you get higher than 50V, the rules...

    Also, once you get higher than 50V, the rules change.
  2. Granted, but there are batteries a whole lot...

    Granted, but there are batteries a whole lot bigger than 2 AA's.
  3. I don't have my codebook handy, but isn't AC...

    I don't have my codebook handy, but isn't AC resistance always equal to or greater than DC resistance?
  4. Why is that? My little camera has a really bright...

    Why is that? My little camera has a really bright strobe that runs off a pair of AA batteries.
  5. Replies
    3$$
    Views
    307

    No. If you use a 50A breaker then your worst case...

    No. If you use a 50A breaker then your worst case derated conductor ampacity must be more than 45A. Go to a #6. This happens occasionally.
  6. Replies
    6$$
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    242

    What does that mean?

    What does that mean?
  7. But some of those inverter integrated DC...

    But some of those inverter integrated DC combiners have non-finger-safe fuse blocks and the DC disco is between the fuses and the inverter, so those fuses are not serviceable without another disco...
  8. Yeah, even when I was 11 I realized that crawling...

    Yeah, even when I was 11 I realized that crawling under my desk wasn't going to help me survive a nuclear attack. During the Cuban Missile Crisis I was living in Lake Charles, LA, which at the time...
  9. Replies
    5$$
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    247

    Is that what you meant to say? He asked if it...

    Is that what you meant to say? He asked if it would be a violation and your answer says that it would violate code if it had a partition.
  10. Duck and cover, actually. I am old enough to have...

    Duck and cover, actually. I am old enough to have gone through those drills.
  11. Thread: Combiner boxes

    by ggunn
    Replies
    13$$
    Views
    497

    Different voltages? Combining in parallel strings...

    Different voltages? Combining in parallel strings of different voltages will result in less than optimum performance.
  12. Replies
    6$$
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    242

    Is the 480 delta from a separate transformer from...

    Is the 480 delta from a separate transformer from the 480/277Y? If so, I don't think you can bring the neutral from the wye over to the delta if that is what you are suggesting. After the...
  13. Replies
    9$$
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    360

    This rule has always confused me. If an...

    This rule has always confused me. If an inverter's conductor back to the service experiences a fault to ground, the inverter will shut down and the fault will look just like any other ground fault to...
  14. Replies
    9$$
    Views
    360

    Since transformerless inverters do not have...

    Since transformerless inverters do not have galvanic isolation between the DC and AC sides, would the GFP on the DC side suffice?
  15. Replies
    9$$
    Views
    360

    I don't know the answer to your question, but it...

    I don't know the answer to your question, but it might get more attention if it were posted over on the Photovoltaics forum.
  16. Replies
    4$$
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    288

    Maybe I am misunderstanding the question, but the...

    Maybe I am misunderstanding the question, but the systems I have designed have almost all had their own dedicated revenue grade meter irrespective of whether they are line or load side...
  17. Replies
    18$$
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    941

    Tesla batteries might be a good solution for...

    Tesla batteries might be a good solution for folks who are already living off grid. I haven't seen any numbers yet comparing their price per Watt-hour with lead acid batteries or the number and depth...
  18. Replies
    21$$
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    852

    It depends on the AHJ. I have designed load side...

    It depends on the AHJ. I have designed load side connected systems that used AC combiners sized only to accommodate the inverter breakers which passed muster with the AHJ.
  19. Replies
    21$$
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    852

    The 120% rule applies to all the panels through...

    The 120% rule applies to all the panels through which the power from the inverters travels on the way back to the service. If the power is fed through a subpanel, then the inverter output breakers...
  20. He said it was a supply side connection and that...

    He said it was a supply side connection and that the spare breaker was on the load side.
  21. Replies
    87$$
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    2,153

    So I was reviving the issue? Whatever.

    So I was reviving the issue? Whatever.
  22. Is there a disco on the PV circuit out by the...

    Is there a disco on the PV circuit out by the meter? That's the only way I would configure such a system.
  23. Replies
    21$$
    Views
    1,054

    I don't think it's a problem. I have seen discos...

    I don't think it's a problem. I have seen discos on 240V high leg services where the high leg fuse was a lot smaller than the other two.
  24. Replies
    87$$
    Views
    2,153

    What I could care less about is who is the...

    What I could care less about is who is the undisputed champion. Give it a rest.
  25. IMO, the safe installation of a PV system which...

    IMO, the safe installation of a PV system which will supply enough energy to make an appreciable difference to a household's electric bill is far beyond the ability of the average homeowner. Those...
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