Jump to content

Crossy

Global Moderator
  • Posts

    44,928
  • Joined

  • Last visited

Posts posted by Crossy

  1. 6 minutes ago, scotty1286 said:

    The ratings on these switches are just the maximum voltage the switch contacts can handle, therefore makes no difference if low voltage AC or DC

     

    Unless it's a hall-effect switch, in which case AC will kill it.

  2. 2 hours ago, CallumWK said:

     

    Partly correct.

     

    I just measured, and when put meter on AC I measure ~8V, when put meter on DC I measure ~5V. I measure at the PCB contacts

     

    So how I know if it is AC or DC, as I think that will matter. Not?

     

    What happens if you measure a 9V battery with the meter set to "AC". Some (mainly cheap) meters will measure "something" if set incorrectly, I suspect your 5V DC is actually what you have.

  3. 6 minutes ago, OneMoreFarang said:

    Please pin also a sentence like this:

     

    Don't mess around with mains if you don't know what you are doing. It could kill you.

    page_74_image_14_rgb_copy_.jpg

     

    That will answer at least half the questions in this forum.

     

     

    Image added to the pinned Local Forum Rules thread which already had said warning.

     

    Take care out there.

    image.jpeg.2caa1685dea175460fb8924035cb12d3.jpeg

    • Thanks 1
  4. 34 minutes ago, lom said:

    I don't think any of the digital meters have that but they have a button to switch between display mode, they can display P and Q in both directions.

     

    Depending upon the installed firmware and settings the meters can monitor and record many parameters.

     

    Common settings would include: -

    • Import and Export energy
    • Time of Use (on/off peak) usage

    Pressing the blue(?) button switches between at least two display modes.

  5. 1 hour ago, 007 RED said:

    A few members have in the past commented that there are no real consequences if you get caught for having a grid tied solar system which has not been approved and your system spins the old style meter backwards.  If I recall correctly those members advised that at worst the PEA will just change the spinning meter for a new electronic one so that you can’t spin the meter backwards in future and that they never take any action against that solar system owner.

     

    Thanks for this, this is the first report we've had of actual serious consequences from spinning the meter backwards.

     

    I'm not sure about the legality of the PEA actually damaging private property but the home owner permitted it so ...

     

    I would certainly not recommend the owners of large systems relying upon simply not getting caught which is the main reason we are in the process of upgrading to hybrid inverters with energy storage, if it were grid-tie our system would be well outside the allowable system parameters.

     

    I suspect he's well above the 5kWp permitted for single-phase grid tie, maybe that's what upset PEA, looks like two arrays of 18 panels each.

     

    By the way, it's not exactly difficult to replace those cut off cables and bring the array back into service. He would need a new hybrid inverter and energy storage of course.

     

    • Thanks 1
    • Agree 1
  6. 2 hours ago, patman30 said:

    you need a license/permission to export to the grid
    it can be dangerous to export to grid when not supposed to

     

    It is important to understand the difference between exporting to a live grid (no hazard) and back-feeding a dead grid (hazard to linemen).

     

    All domestic-level grid-tie inverters implement anti-islanding which will kill the inverter should the grid go down.

     

    I'm not aware of any instances where a correctly installed grid-tie inverter has caused a hazard to linemen.

     

    There are documented instances of inverters that are not intended to grid-tie and domestic generators being incorrectly wired to back-feed and worker deaths have been reported.

     

    It is vital to use the correct type of inverter and connect in the approved manner.

    • Thumbs Up 1
×
×
  • Create New...