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Generators and switch mode power supplies

Discussion in 'Hobby Electronics' started by Sylvia Else, Feb 4, 2009.

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  1. **Yep. Already done. Badly, but the previous owner did it. I intend
    improving significantly.
    **I think I'll do it by hand. It's good for the soul and feels great to jump
    in the pool after a hard day's digging.
     
  2. Sylvia Else

    Sylvia Else Guest

    It's not for you to tell me how I should seek to apply such resouces as
    I have to avoid the consequences of power cuts. You may not find them
    annoying.

    I do.

    Sylvia.
     
  3. Fair enough.
    It might help then if you tell us what things you might need to keep
    powered during a black-out.
    You've already mentioned the computer as an example, what else?
    How long and frequent are your typical power-outs?
    How long do you want a generator to last?
    Maybe a UPS solution is better suited to your needs?

    Always more than one way to skin a cat. Take your computer for
    example, laptops draw much less power than desktops, and can handle
    black-outs of several hours no problems. Add a small UPS to keep a
    modem and some other stuff going and you are still in business. I was
    happily surfing the web and doing work on my phone while I was stuck
    in the lift the other week for example.

    Dave.
     
  4. Sylvia Else

    Sylvia Else Guest

    I asked a very specific question in relation to the tolerance of split
    mode power supplies to variations in input waveform. That's all I asked.

    Sylvia.
     
  5. Bob Parker

    Bob Parker Guest


    I'm really thick and also my troll filters have blocked out a lot of
    recent discussions.

    Can someone please tell me what a 'split mode' power supply is? I'd
    never heard the term before, and a Google search mainly brings up the
    newsgroup threads where they keep getting talked about.

    Thanks.
     
  6. Bob Parker

    Bob Parker Guest


    plonk
     
  7. I believe it's a typo, she said "switch mode" in her first post.

    Dave.
     
  8. a t e c 7 7

    a t e c 7 7 Guest

    weakling
     
  9. Bob Parker

    Bob Parker Guest


    De-plonk.... it took a while to work out what your comment meant and
    I suspect you might be correct. :)
     
  10. atec 77

    atec 77 Guest

    She has that effect.
    all of us get accused at some stage but saliva is a certainty as you
    will see.

    What was the question again :)
     
  11. Sylvia Else

    Sylvia Else Guest

    Though I did use the expression "split mode" in the subject of another
    thread. No one commented then, but its's true that it doesn't seem to be
    a recognised alternative wording. Put it down to my aging brain cells.

    Sylvia.
     
  12. **As an old mate, of Italian descent used to say:

    "We came, we saw, we concreted."
     
  13. atec 77

    atec 77 Guest

    Good luck getting a good cabler this time of year let alone a sparky who
    even bothers to show up
     
  14. terryc

    terryc Guest

    An Italian neighbour ws discussing my pruning of the orange trees and gave
    me his advice about what to do to help them recover from the heavy pruning
    brought on by rampant bug infestation.

    It basically involved heavy fertilising with compost then mulching
    all withn a foot around the trunk.

    After he left I explained to chief gardener that his advice wasn't that
    useful. He did is that way because they all grew their citrus, figs, etc
    tree in little holes in the concrete wasteland that is usual in italian
    backyards. I was just going to stick to putting the mulch around the
    drip line about 4' & 5' out from the trunk as suit3ed our trees.
     
  15. atec 77

    atec 77 Guest

    who's sister are you doing ?
     
  16. terryc

    terryc Guest

    Unfortunately some around here insists they be taken for a humane death.
     
  17. terryc

    terryc Guest

    I think my method of stunning them with the back of the shovel, then the
    coup de grace with the block splitter is the problem. Tough little
    buggers. You really need a solid rock underneath as bricks inevitably
    split.

    Naah, the local council will take them for free and if wild moggy turns
    out to be someones cut puddy that just escaped that night, then there is
    no evidence.

    Unfortunaely, our local council takes a dim view of recycling anything
    organic and has actually passed a law requring all captured cats to be
    surrendered. Also gives me the opportunity of retail therapy to get over
    the <sob> of sending puddies to the death<sob>. As we leave the
    pound "while we are over this way...." can be used -).

    I just wish she would not pass around the pictures of me of my playing
    with feral kittens to make them cute and cuddly to maximise their adoption
    chances at the pound. I guess that is another fringe benefit.
     
  18. **On a related matter, I had a run-in with my local pound a few months back.
    There was a cat prowling around my yard at night and sometimes during the
    day. I lost at least one fish and I have no idea how many native birds and
    reptiles have succumbed to the creature. Last time I had a problem, I
    arranged with the local animal control guy to loan me a cage, duly baited to
    catch the buggers. Owners whose critters are chipped get them back (at a
    cost) and usually keep their cats indoors after shelling out a few hundred
    Bucks. Moggies get sent to the pound and ferals (and those guys are scary
    critters) are executed. Anyway, my new local council wanted ME to knock on
    all my neighbours doors and ask them if they owned the cat and if they would
    do something about it. Sheesh! I protested that the cat was probably killing
    native animals, but they said that they have a 'no execution' policy now.
    Probably been petitioned by cat owners. I should introduce those cat owners
    to some of the animals living in the stormwater drains.

    Fucking cat owners. They're the problem.
     
  19. Sylvia Else

    Sylvia Else Guest

    I'm on Energy Australia's network. Significant outgages are not that
    common, but they do happen. A friend was without power for an extended
    period because of the Chatswood substation fire in 1999. That fire
    affected 23,000 people.

    There are annecdotal reports of transformers being subject to ad-hoc
    cooling with fire hoses to prevent them from overheating. This doesn't
    lend confidence that the infrastructure is up to the task of handling
    high temperatures.

    Part of Victoria's recent power problem arose because Basslink
    apparently cannot operate at full capacity in high ambient temperatures
    (that is, exactly when it's likely to be most needed).

    And of course, from the USA and UK and Europe (Switerland/Italy) we've
    seen how power systems can have cascading failures that can take 24
    hours to put right. Thought at least we're not likely to see outages
    caused by freezing rain.

    After the UK had its huge windstorm some 20 years back, some country
    properperties were without power for a couple of weeks. I my self was
    without power for 12 hours or so. One doesn't realise just how dependent
    one is on power until it goes off. Even our stove was electric. I ended
    up making tea by sticking a cup of water next to a gas fire (I prefer
    electric fan heaters. I'd kept the gas connected, and paid the service
    charge, just in case).

    I also lived in the UK during a year long miners' strike, and we had
    rotating blackouts lasting three hours on several nights a week. That
    was a real pain.

    Here in NSW we were fortunate that the heatwave occurred most severely
    at the weekend when power demands tend to be lower. Had it occurred a
    couple of days earlier, NSW reserves would have been stretched.

    And of course there's the bushfire season, where bushfires can
    compromise transmission lines (and did so last year, or perhsp a few
    years before - Parliament House got cut off!).

    My main concern is an extended power loss during a worse heatwave then
    the one we've just had. I'm not trying to run the entire house - just
    the study, with its airconditioning and computers, which has a floor big
    enough to drag a a matress or too into to sleep on if the outgage
    continues into the night.

    How much it's really worth spending on protecting against something that
    may never happen, well that's another question, but the price is not
    just to address the issue when it arises, it's, like insurance, to
    provide assurance that the risk is being managed, one way or the other.

    Sylvia.
     
  20. terryc

    terryc Guest

    On Sun, 08 Feb 2009 23:19:02 +1100, Sylvia Else wrote:
    hs so the supply's not exactly parlous where I am.
    I just worry about my own provider. If I was in the countryside anywhere,
    then I would regard a number of diesel generators as absolutely
    essential.

    It really vcomes down to economic rationalism. If you can bill
    $500 per hour, then your own serious UPS with backup generator and
    250litre fuel tank is probably justifiable*.

    But if this is just a home userwith an internet adiction, then a
    laptop with prepaid wireless access and spending the night in the
    knocking shop, woops Formula 1 motel probably makes a lot more
    sense. Telstra has one of their WAP accesspoints just across the road from
    the knock shop at McChuckies.

    * The trouble is where do you stop? Most people do not think about where
    they are going to store the 20, 40, 60l of petrol. Someone thought of
    running his on mains gas, but what do you do if we have a WA supply
    incident. You could end up with more money invested than in your house.
     
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