• Posts
  • RSS
  • ◂◂RSS
  • Contact

  • Solar Arc Faults

    April 3rd, 2020
    solar  [html]
    Update 2020-08-30: SMA published a firmware update that fixed this problem.

    Our solar install has shut itself down after detecting an arc fault four times since we installed it eighteen months ago: 2019-03-24, 2019-04-10, 2019-08-17, and 2020-02-17. The 2019-04-10 shutdown was with error code 4301 while the other three were with code 8206. Per the manual for our SunnyBoy 5.0 inverter, these codes are:

    4301: The inverter has detected an electric arc. The inverter interrupts grid feed-in and cannot connect to the utility grid.

    8206: The inverter has detected an electric arc and was recommissioned after a disconnection.

    The inverter can take up to three strings, and ours is configured with two. A sensible inverter would track which of the strings the arc fault had been on, to help narrow down the problem, but apparently this one doesn't. The techs decided to turn off one of the two strings, and see if the fault re-occurs. Based on four faults in 18m, with the longest interval of 6m, you'd need to wait about 8m with no faults before being pretty sure the problem was with the disconnected string. This seems like a long time to be producing at half capacity, but apparently inspecting an installation on a steep roof to locate an arc fault is very difficult? This doesn't make much sense to me, but also I don't know much about it and kind of need to take the techs' word for things.

    Comment via: facebook, lesswrong

    Recent posts on blogs I like:

    Fireside Friday, January 22, 2021

    It’s the first week of classes, so fireside this week. Next week, we’ll dive into a short series looking at the question of the ‘universal warrior,’ the idea – too often repeated – that there is either a single consistent experience or personality true to…

    via A Collection of Unmitigated Pedantry January 22, 2021

    Poor Rich Countries and Isomorphic Mimicry

    A curious pattern can be found in subway construction costs around the world, based on GDP per capita. On the one hand, poor countries that have severe cultural cringe, such as former colonies, have high construction costs, and often the worst projects ar…

    via Pedestrian Observations January 21, 2021

    What is going on in the world?

    Crossposted from world spirit sock puppet. Here’s a list of alternative high level narratives about what is importantly going on in the world—the central plot, as it were—for the purpose of thinking about what role in a plot to take: … Continue reading →

    via Meteuphoric January 17, 2021

    more     (via openring)


  • Posts
  • RSS
  • ◂◂RSS
  • Contact