DL in the field

Discussion in '35mm Cameras' started by Alan Justice, Feb 16, 2011.

  1. Alan Justice

    whisky-dave Guest

    I think Apple advise not to run a laptop without the battery present
    as the 'power' from the converter isn't enough to fully drive the
    Although it's probbaly be OK for most things.
    whisky-dave, Feb 21, 2011
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  2. Alan Justice

    Savageduck Guest

    Current MacBook Pros do not have a user replaceable battery. I am not
    sure of the lesser MacBooks. My Old PowerBook Pro (a PPC or non-Intel)
    machine has a user replaceable battery and it is possible to run that
    without the battery. That option is not possible with the Intel

    ....and as I have said I use the Kensington Power Inverter which is able
    to power the MacBook Pro 85W power supply without issue.
    Savageduck, Feb 21, 2011
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  3. Alan Justice

    Eric Stevens Guest

    Apart from anything else, the battery acts as a giant smoothing
    capacitor and smoothes out most of the ripple and harshness of the
    power supplied by most invertors.

    Eric Stevens
    Eric Stevens, Feb 21, 2011
  4. Alan Justice

    K W Hart Guest

    I think Apple advise not to run a laptop without the battery present
    as the 'power' from the converter isn't enough to fully drive the
    Although it's probbaly be OK for most things.

    I would think that such advise (keeping the battery installed) would be to
    act as a capacitor and smooth out the power. If the power from the convertor
    isn't sufficient to drive the machine,, it certainly isn't going to recharge
    the battery.
    When I did consumer electronics repair, I always kept a car battery on hand
    for working on high power car stereos. My bench power supply was rated high
    enough to supply the car stereos, but the capacitors in the power supply
    weren't enough to supply pure DC.
    K W Hart, Feb 21, 2011
  5. Alan Justice

    Eric Stevens Guest

    At one stage my business owned an early Cromemco computer the power
    supply of which was equipped with capacitors the size of bean cans.
    There was a lot of construction work going on in the district and one
    day we experienced a power supply glitch long enough to cause all the
    fluorescent lights go out and then have to go through their restart
    procedure. The large capacitors of the old Cromemco enabled it to just
    sail right on through all of this even though it was running three
    users at the time.


    Eric Stevens
    Eric Stevens, Feb 21, 2011
  6. Alan Justice

    Pete Guest

    Now that's what I call a power supply. Most products have a "sour
    supply": a half second glitch and they shut down; acidic comments
    Pete, Feb 22, 2011
  7. Alan Justice

    whisky-dave Guest

    The air doesn't either.

    I am not
    Well yes if you buy a new Mac but perhaps the better option for the OP
    would be a cheaper laptop such as old old Mac or even PC type
    which I believe most have user replaceable batteries
    That might be the same or similar one to my friends which 'blew up'
    although I thought his was 65W.
    But it was blown by using an inverter (UK inverters give out ~230V).
    he uses his powerPC macbook G4 1.5GHz 15" on a boat and this one time
    forgot to use a surge protector. Although we can't prove it, it
    stopped the
    laptop battery charging. He brought a new charger, no luck so he took
    the labtop
    back to an Apple store where they tried a new battery which worked
    The 5 amp surface mount fuse in the laptop was OK as we tried that

    His inverter has also died so whatever caused this spike from his
    diesel generator
    did something nasty blowing up the inverter, PSU and battery or at
    least that appears
    to be what happened.

    So just a warning really, I hear on a mac podcast that USians are more
    likely to suffer brownouts
    and surges, lightning than we in the UK are generally speaking.
    I can only speak for my bit of London and I can't remember a powerout
    in the last 10 years.
    whisky-dave, Feb 22, 2011
  8. Alan Justice

    Savageduck Guest

    So? You are not going to randomly remove that battery either if you are
    using a MacBook Air.
    At no time have I suggested which "laptop" he should consider. He can
    buy whatever works for him. I have just remarked on some nominal
    differences between "Netbook" & "Laptop" portable computers. I used my
    experience as an example, and I have been using Apple computers since
    He seems to be a Windows user, and I have no idea if he would, or would
    not care to switch OS at this stage, or if he would be comfortable
    switching. (Though I suspect he would be quite happy if he did. There
    are others in this NG who have who are happy with the move.)
    Correct, the PPC G4 Powerbook & MacBook portables use a 65W power
    supply, and they are normally functional with voltage input range of
    100-240V 50/60Hz. Current Mac portables us a 60W power supply for
    portables with displays 13" and smaller, and 85W for 15" & 17"
    I can't speak for what might, or might not have happened to the setup
    your friend was using with diesel generator.
    I have the occasional power outage out here at the lake. The cause can
    be anything from a lightning strike, a localized PG&E transformer
    issue, sometimes an accident where a utility pole has been damaged
    miles from my home. For that eventuality I have a UPS which does a good
    job of giving me time to shut down safely, and which provide a degree
    of protection against power surges. For those extended outages I also
    have a Honda 3000W portable generator (this one is not all that
    portable, or as quiet as I would like), which provides 110/240V output
    and 12V charging when I need it. That has been around twice a year.
    Savageduck, Feb 22, 2011
  9. Alan Justice

    Alan Browne Guest

    Not really. To a degree when the battery is not charged, perhaps, but
    once it is fully charged it doesn't soak ripple as well.

    It's not the job of a battery to do so in any case - the power supply
    front end is there for that.
    Alan Browne, Feb 23, 2011
  10. Alan Justice

    Alan Browne Guest

    No. The power converter can run the MacBook at full load AND charge the
    battery at the same time.

    The PS design may not handle the no load on the battery side for a
    variety of reasons however.
    Alan Browne, Feb 23, 2011
  11. Alan Justice

    whisky-dave Guest

    If the battery goes the laptops dead too, send back to Apple.
    Not the sort of thing you want while out on a photo shoot
    or even arriving back from one.
    Me. too and I agree with the majoroty of what you say until you talk
    buying a new laptop a Macbook pro in this example, they are great
    machines but I think a bit pricey
    for what the OP had in mind which seemed to be just to view images on
    a larger screen
    or to off load images off a card.
    Yep I totally agree if he has $1000 or more to spend.
    There maybe a way of using an ipad2 (when it comes out) or any other
    for viewing what you've taken on a lager screen.

    Yes so I wonder what happens if you put it on a generator that can go
    above 260V.
    I guess it's OK in the US when the generator is pumping out 115V, but
    in the UK
    we need 230/240 not much of a margin, although I though the max range
    was 80-263V
    But that might have been another adaptor, I tend to buy a lot of
    adapters for work too.
    Neither can I that's the problem, we don;t know what caused the
    but with a blown inverter (caps blown), blown kenington charger, and
    knackered battery
    everything points to the generator going over voltage.
    The thing is it's been OK for 2 years, it's just this one time he
    didn't use a mains surge suppressor.
    Few people have them in the UK, home users our national grid is
    surprisingly reliable.
    Similar to my firensd 2KW I assume, yeop and tehy are load in fact
    there's a 'ban'
    on them being on after 8pm where he is. (a canal in London) .
    yes the 240V output going into a 240V input is OK, but if there;s a
    spike ......
    whisky-dave, Feb 23, 2011
  12. Alan Justice

    Eric Stevens Guest

    That's true, but if its fully charged you don't need to hang it on an
    invertor or similar.
    It may not be the job of the battery, but that's what it does. As for
    the computer's power supply, if its a 'switched mode' it can get
    particularly excited if its fed with the output of some of the rougher


    Eric Stevens
    Eric Stevens, Feb 23, 2011
  13. Alan Justice

    Bill Graham Guest

    Here in the US, it depends a lot on where you live. If your area is subject
    to high winds and storms, then you will experience a lot more power outages
    and surges than if you live in a "gentler" area. Here on the Pacific coast,
    the whether is generally pretty mild, so we enjoy pretty steady line power
    most of the time.
    Bill Graham, Feb 24, 2011
  14. Alan Justice

    Alan Browne Guest

    Sure you do. When I'm in the hotel, at home or at work, the laptop is
    plugged in, often for weeks. That battery is well topped up.
    If its fed from its 'brick' that's all it needs. The PS in the laptop
    has further filtering and transient absorption before it converts to the
    various voltages needed by the motherboard and internal peripherals.
    The battery charger part of the laptop has its own regulation in any
    case past that point and the laptop PS and electronics won't even see
    the benefit of whatever ripple absorption the battery may be providing.

    It's just more complex than other battery/ps devices.
    Alan Browne, Feb 24, 2011
  15. Alan Justice

    Alan Justice Guest

    That's not the case in my neck of the Pacific Coast. Here in Northern
    California we get many outages every winter.
    Alan Justice, Mar 3, 2011
  16. Alan Justice

    tony cooper Guest

    We should be so lucky here in Central Florida. Few weeks go by
    without an outage. Everyone's air conditioner kicking on in the late
    afternoon causes the blow-outs. Even in the winter since most of us
    heat our home with our air conditioner as a heat pump.
    tony cooper, Mar 3, 2011
  17. Alan Justice

    Eric Stevens Guest

    No wonder: just look at the longstanding policy by which California
    doesn't build either base or peak load generating capacity of its own
    but relies on buying from surrounding states.


    Eric Stevens
    Eric Stevens, Mar 3, 2011
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