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  1. I'm not aware of a requirement for an additional...

    I'm not aware of a requirement for an additional PV disconnect in this situation. If the garage was next to the house with the service disconnect I would probably feel fine without a disconnect. If...
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    If you are looking at doing an AC combiner with...

    If you are looking at doing an AC combiner with 705.12(D)(2)(3)(c) then all the discussion about vector math is moot. The code just adds up the CB ratings, and really is assuming that 3ph services...
  3. You are correct 690.12(C) clearly says on a...

    You are correct 690.12(C) clearly says on a single service, not on a single building. You can have two RSDs grouped together outside the building. They do not need to be mounted next to the service...
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    There's a pretty spirited fight going on over the...

    There's a pretty spirited fight going on over the 2020 NEC on this point. It's been going back and forth between making the PV disconnect on a supply side interconnection have a neutral-ground or...
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    An entertaining thread. Y'all realize that when...

    An entertaining thread. Y'all realize that when we do three phase math and use the square root of three in the calculations that we are doing vector math, right? So we do it all the time. The square...
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    The inverter connectors comply with 690.15(A)(2)....

    The inverter connectors comply with 690.15(A)(2). The interconnection CB at the existing panelboard you interconnect to, assuming it is mounted in a compliant location, will comply with 690.13(A)....
  7. What's the shut down error message? Most...

    What's the shut down error message? Most inverters these days are pretty good about telling you why they are shutting down. Random shutdowns during peak production are also a sign of possible AC...
  8. No one knows where the electron goes.

    No one knows where the electron goes.
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    The terminal temperature rating usually relates...

    The terminal temperature rating usually relates to conductors terminated on an OCPD or an insulated terminal. Often if you land on a busbar with an uninsulated "9" rated lug you can use the full 90C...
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    It is, but then again people punch holes in...

    It is, but then again people punch holes in pressurized gasoline pipelines in Mexico to get free gas. There is no limit to how stupid humans can get when they think they can get some free stuff.
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    I thought that DC Optimizers let you mount...

    I thought that DC Optimizers let you mount modules anywhere? Have I been lied to again? What's next, bifacial modules can't collect the sunlight from the other side of the world on the backside at...
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    All the panels between where the PV interconnects...

    All the panels between where the PV interconnects and the utility POCC have to meet the 705.12 requirements. If the home panel has a 200A main OCPD changing the OCPD in the pedestal will not satisfy...
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    Should have put a rooster sticker on it and said...

    Should have put a rooster sticker on it and said it's a feature of this model.

    NEC 690.4(E) says you can't install an inverter in a bathroom. The only restriction I know of.
  14. AHJ passes something that the contractor thinks...

    AHJ passes something that the contractor thinks might be a code violation, either because the AHJ missed it, does not understand why it is incorrect, or just doesn't care about that one thing, etc....
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    It depends.... In general, a non-fusable...

    It depends....

    In general, a non-fusable disconnect protected upstream by any correctly rated fuse or circuit breaker will give an SCCR of 10kA. If you have more available fault current than that...
  16. Enjoy that you were allowed to do this for years...

    Enjoy that you were allowed to do this for years even though it was not following the code. But now you are being held to the NEC and the AHJ is correct. There was a TIA issued to allow center-fed...
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    A reverse power relay is a protection system that...

    A reverse power relay is a protection system that uses a protection relay to monitor the power flow at the POCC. If the power flow reverses and starts to send power to the utility it trips the PV...
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    There was a time in the dark past, 20,000 PV...

    There was a time in the dark past, 20,000 PV years ago (10 real years) when PV modules were so expensive that inverters were always sized to prevent clipping and therefore were under producing 99% of...
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    There is no guidance on what current to use, and...

    There is no guidance on what current to use, and the output of an inverter is highly variable.
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    I've found a lot of variety in doing the voltage...

    I've found a lot of variety in doing the voltage drop calc. Since it's not a code issue we are left to choose values based on experience and how close we want to get to losing everything on the...
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    We want to look at the voltage window we have to...

    We want to look at the voltage window we have to work with, so we compare the maximum operating AC voltage of the inverter with the max AC voltage the utility is supposed to limit their system to in...
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    ggunn, are you trying to use the SolarEdge Smart...

    ggunn, are you trying to use the SolarEdge Smart Energy Management system to create a no-export system, maybe backed up with a reverse power relay? I'd like to meet the contractor that got that to...
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    The ANSI B range upper end is 508V. That means...

    The ANSI B range upper end is 508V. That means you get at most 11V of voltage drop to work with before you hit 529V . Based on a nominal voltage of 480V that gives you 2.29% voltage drop. Even the...
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    Section 130.5 of the 2019 CA Energy Standard...

    Section 130.5 of the 2019 CA Energy Standard covers electrical distribution system voltage drop. Source to load the combined voltage drop through feeders and branch circuits has to be 5% or less, not...
  25. Possible, but a lot of assembly required unless...

    Possible, but a lot of assembly required unless someone is selling an integrated unit. The GE HPC is a contender except no visible blades. This is the reason 240.67 has delayed implementation, the...
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