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  1. Replies
    6$$
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    797

    JB is correct, and this is a no-brainer. The...

    JB is correct, and this is a no-brainer. The main breaker in the service panel protects the service panel bus, the feeders to the house panel, and the house panel bus, which is also protected by...
  2. Replies
    4$$
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    568

    We use Cobra X-Flex battery cable. It's UL...

    We use Cobra X-Flex battery cable. It's UL listed and comes in red and black.
  3. Replace the top lugs with the type of lugs used...

    Replace the top lugs with the type of lugs used at the bottom (Ilsco PBHD2-750 or something similar) and then combine the two smaller conductors per phase into a single conductor using Burndy Clear...
  4. Replies
    27$$
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    1,861

    147 kW at 480V 3Ph = 177A line current. Are you...

    147 kW at 480V 3Ph = 177A line current. Are you sure your 300A figure is correct? My VD calculator is telling me that the VD for a 1000' 480V 3Ph 3W circuit with 300A through a #350 AL conductor is...
  5. As long as you have a main breaker in the...

    As long as you have a main breaker in the sub-panel, you won't get excess current coming off the end of the main panel bus and feeder conductors.
  6. I have run into this situation several times, and...

    I have run into this situation several times, and there is a gap in the code here that I hope is addressed in the next revision. The proposed installation certainly meets the letter of...
  7. Replies
    6$$
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    898

    The detached garage sub-panel should have a main...

    The detached garage sub-panel should have a main breaker in it, so correcting that should be the first order of business. Make sure you have a proper GEC to a GES while you are at it. Your...
  8. Replies
    14$$
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    1,623

    21982 Here is a simple schematic showing the...

    21982

    Here is a simple schematic showing the issue. The fuse on the battery end of the shorted conductor will blow eliminating current from the battery to the short. The other 23 batteries that...
  9. Replies
    11$$
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    1,652

    I'll bite. AC modules do not have any controlled...

    I'll bite. AC modules do not have any controlled conductors (no PV source circuits or PV output circuits) and would therefore not require rapid shutdown.
  10. Replies
    14$$
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    1,623

    The battery side of the shorted string conductor...

    The battery side of the shorted string conductor will experience up to 1260 amps, which is the battery's short circuit current rating (in the manual, but not in the spec sheet), and will immediately...
  11. Replies
    14$$
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    1,623

    I get that unfused battery conductors are subject...

    I get that unfused battery conductors are subject to high fault currents that exceed their rating, and I try to design battery systems with fuses located as close to the battery terminals as...
  12. Replies
    14$$
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    1,623

    Sourcing DC rated fuses is not really the issue. ...

    Sourcing DC rated fuses is not really the issue. The advantage of the cable limiters is that their form factor could potentially allow the elimination of an expensive DC panelboard. Because they...
  13. Replies
    14$$
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    1,623

    JaggedBen, the battery unit I had in mind is the...

    JaggedBen, the battery unit I had in mind is the Simpliphi, Phi 3.4. Each unit has its own BMS and 80A breaker. The manufacturer recommends paralleling multiple units and specifically prohibits...
  14. Replies
    14$$
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    1,623

    Battery Combiner OCPD Necessary?

    With L-ion and LFP batteries becoming more popular, I have been thinking about the need to provide fusing for individual battery strings similar to how PV string combiners are fused at a DC combiner...
  15. Most of the residential inverters I work with...

    Most of the residential inverters I work with (SMA, Solectria, SolarEdge, Fronius) specify a max OCPD on the AC side. This is generally found in the installation manual, but not the spec sheet. The...
  16. Replies
    13$$
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    1,376

    When you connect the output of a grid-tied...

    When you connect the output of a grid-tied inverter (or 4 of them) to the output of a hybrid inverter (a.k.a. grid-tied battery inverter), this is known as AC coupling. It is important to understand...
  17. Replies
    12$$
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    1,514

    Have you considered wiring the array with just...

    Have you considered wiring the array with just two strings? Which optimizer are you using? Have you used the SolarEdge online Designer tool? I designed a very similar system earlier this year...
  18. Replies
    33$$
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    3,514

    Wago makes a connector that is essentially a...

    Wago makes a connector that is essentially a back-stab unit, but this is not the one I am looking at. The Wago model 221 lever connectors can be opened and closed with a lever, and it appears that...
  19. I have sat through a couple battery backup...

    I have sat through a couple battery backup training courses where I was advised not to use the term "critical loads panel" to describe a typical residential backup loads panel. The NEC specifically...
  20. Replies
    33$$
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    3,514

    Here is the spec sheet indicating 600V, however,...

    Here is the spec sheet indicating 600V, however, I can see in the picture that it says 300V on one side, and I have seen other photos of them that show 450V on the other side. Not sure what to make...
  21. Replies
    33$$
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    3,514

    I initially ruled out the Wago lever connectors...

    I initially ruled out the Wago lever connectors because they weren't 600V rated, but I have a spec sheet saying the ones they sell in the US are 600V rated and 1000V rated for signs and luminaires.
  22. Replies
    33$$
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    3,514

    I did some more research on the web and...

    I did some more research on the web and discovered the Wago 221-612 lever wire connector. I am not sure if it will work with the larger diameter of the PV wire, but I am going to get and sample and...
  23. Replies
    13$$
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    1,517

    The OP's original question is an excellent one. ...

    The OP's original question is an excellent one. How the heck does the electricity know which way to flow???

    The water analogy is a great way to think about how it all works. Consider the...
  24. Replies
    33$$
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    3,514

    We usually use Burndy clear tap's when we do a...

    We usually use Burndy clear tap's when we do a line-side connect or feeder tap. They make a very solid splice, but when used for the DC splice, they take up a lot of room in a j-box, and they are...
  25. Replies
    39$$
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    2,431

    Interesting situation. With only two strings per...

    Interesting situation. With only two strings per inverter, I don't believe fusing would be required on any of the strings, even if the strings were all in the same conduit. What size homerun wire...
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