• 3 Posts
  • 573 Comments
Joined 3 years ago
cake
Cake day: June 17th, 2023

help-circle

  • I had a chat about this with a friend who works for the national grid (UK).

    Apparently the problem is keeping the grid balanced and stable. Basically, the grid struggles to react fast, so they plan ahead. Things like large scale solar can provide predictions on output. Home solar can’t.

    When clouds pass over an area it can cause slumps and surges in the local grid. The more home solar, the worse it gets. The current grid is designed to work top down, with predictable changes in demand. It needs upgrading to deal with large scale bidirectional flows.

    The plug in units are (potentially) even more ropey. If used properly, they are no worse than normal home solar. Unfortunately, being cheaper, there are worries over the microinverters not shutting down. Either due to the manufacturer cheaping out, or turning on an “off grid” mode.

    There are also worries about overloading household circuits. Back feeding bypasses the household circuit breakers and RCDs. They could overload wall wiring and cause fires, or stop an RCD tripping, allowing for a person to be shocked.

    I don’t know how much this would apply to the American Grid, but I would imagine it would be worse. Your grid is older and larger. You also use 120VAC which makes the current overload issue a lot worse.




  • Modern warships basically gave up on heavy armour. Instead they use manoeuvrability and suppressive fire. They are also intended to support each other in a fleet. A single warship, running close escort, loses all these advantages. It can’t outmanoeuvre an attack, and it lacks the firepower to suppress a heavy attack on its own. Iran would make a point to try and sink both the escort ship and its protected cargo ship.

    In order to work, the American navy would have to run a full convoy. A far bigger logistical challenge.



  • As a parent, an extra layer of protection would be a positive. Balancing everything, and not leaving holes is hard enough, and I’ve yet to deal with the teenage phase.

    As the same time, as a Netizen, the risk of abuse to datamine me is FAR too great.

    The only way I would accept it is via zero knowledge proof type tokens. I can prove I am of age, but nothing more about me can be determined by any party.

    The current laws seem aimed at using “protect the children” to remove anonymity from the web, and are a data miner’s wet dream.




  • I lost a good friend a similar way. He insisted there was a global conspiracy to suppress “free energy” (over unity generators), among other things.

    My background allowed me to personally prove some of his arguments wrong from almost first principles. He then accused me of personally being part of the conspiracy. At that point I concluded he was a lost cause and parted ways.

    Most of his “evidence” was in YouTube videos. I went through a couple. It mostly had the build-up, explanation, consequences, and conclusions. It missed any actual evidence. It’s amazing how someone can fill 2 hours with nothing of substance.




  • Its more a problem with women’s cloths, but there are 2 factors in play. You make them bigger than the listed size and someone can suddenly squeeze into a smaller size. A 14 fitting into a 12 is a big dopamine hit, and so a powerful selling point.

    Counter to that, reducing material usage can add up. 1/2 an inch off every pair of trousers adds up. For cheap clothes this is a noticeable saving.

    Most men tend not to try clothes on in stores. This makes us dependent on the numbers. We react strongly to errors. This kept clothing makers fairly honest. That seems to be breaking down. They are trying the same tricks they use on women, and it’s annoying as hell!


  • cynar@lemmy.worldtoMemes@sopuli.xyzNo u 🫵
    link
    fedilink
    English
    arrow-up
    5
    arrow-down
    6
    ·
    13 days ago

    The point is that the reasonable null hypothesis is flat. It’s the starting point, before you apply the scientific methods.

    It’s quite simple to disprove that however, particularly if you have access to an ocean, or large body of water.



  • The answer is quite mundane. I’ve a few friends in a (non-US) police force. The answer is that the rich/powerful are annoying as hell to go against.

    They either know the law, or pay someone to know it for them. They can make obviously illegal things legal on paper. They can also nitpick everything. E.g. spending £5K on lawyers to get out of a £100 fine, since they don’t want to get the points. Any procedural mistakes, or paperwork errors can kill a case, or at least drag it out for years.

    They also have contacts that can apply pressure. When their wife knows your boss’s, boss’s boss’s wife, they can make your life and career VERY uncomfortable.

    End result, most officers learn to pick their battles with the rich and powerful. They will make your life hard, and will get away without everything being perfect.

    In practice this can easily turn into taking the easy road. Even when the rich aren’t even technically in the right.


  • The rule of thumb with servers is

    • Performance
    • Reliability
    • Power usage
    • Noise
    • Size

    The trick is to remember you don’t actually need much performance. A home server isn’t generally a powerful machine. What matters is that it is always there.

    A raspberry pi would actually make a wonderful server. It’s power efficient, small and quiet, with enough grunt to do most jobs. Unfortunately, it falls down on reliability. Arm servers seem more prone to issues than x64 servers. Pis also seems particularly crash prone. Crashing every 3-6 months isn’t an issue for most pi usages. When it’s running your smart home, it’s a pain in the arse.

    I eventually settled on a intel NUC system. It’s a proper computer (no HDD on usb etc), with a very low power draw. It also seems particularly stable. Mine has done several years at this point, without a crash.

    Bigger servers are only needed when you have too much demand for a low powered option, or need specialist capabilities 24/7. Very few home labbers will need one, in practice.

    It’s also worth noting that you can slave a powerful, but power hungry system, to a smaller, efficient one. Only power it on when a highly demanding task requires sorting.