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  • Pure sine wave inverter

    - by Nick
    Not exactly programming (sorry) but I think it's pretty close and can be of interest to other programmers. I'm trying to setup a battery power station so that I can work from anywhere. I go surfing a lot and my idea is to be able to work from wherever I can park my car (given there's coverage). So, I'm getting a deep cycle battery, a 240V charger (I'm in Australia), and an inverter. At the back of my laptop it says 19V and 4.62A. From the people I've spoken to that means it consumes about 90W at most. So my inverter needs to be able to output about 100W. Most of them seem to be 200W and up so this shouldn't be a problem. I want to be able run my laptop for 10 hours (plus the 2 hours I get from the laptop battery) straight. According to the people I've spoken to and from what I gather online I need a battery that has the amp hours for my "amp draw". I have no idea how to calculate this but I've been guesstimating. Most deep cycle batteries seem to be classified using amp hours (Ah)... 35Ah, 50Ah, 75Ah, 100Ah, and so on. However the amp hours on those batteries is for a 240V and I seem to be using 19V. According to an expert I spoke to you'd need a 100Ah battery to power a 5A appliance at 240V for 10 hours (you only get about 50% useful power). That to me is 5A * 240V = 100Ah battery. So, naive as I might be I take 240V and divide that by my 19V and reach the conclusion that I can get away with a battery that's about 12 times smaller than that 100Ah. The expert told me I needed a 50Ah battery so that's probably what I'll be getting, but it would be interesting to know what I theoretically would need to power my laptop for 10 hours. As for charging the battery the expert I spoke to said I needed a 3-5A charger to be able to charge that 50Ah battery from flat to full in about 10 hours (I will just leave it plugged in over night). Now to my question. The expert said it's not a matter of "if" more like a guaranteed "when" my computer will stuff up if I don't use a "pure sine wave inverter". From what I gather the power that comes out of that battery is not as clean as the power we get in the socket at home. Apparently it's "square" and the one in the socket is nice and smooth. I've already got an inverter, but it's not "pure". Do I really need to buy the $200-300 pure sine wave inverter or can I get away with something else? Perhaps the laptop adapter that sits in the middle of my laptop power cable already fixes that wave to be nice and smooth? Thanks!

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  • How to draw N first elements?

    - by noober
    Hello all, There is a canvas element with 10 children (polygons). There is a number in my code from 1 to 10. I'd like to draw the first N elements from the children elements, base on my number. It would be the best solution to do this from XAML with a minimum code-behind like this: ... MyCanvas.N = 5; ...

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  • DB2 timestamp PHP DateTime

    - by Dolfa
    After upgrade to PHP 5.3 my application is returning DB2 columns with Timestamp type as "2010-12-15-10.23.22.716000". This is causing problem for PHP DateTime function, as it fails with Failed to parse time string (2010-12-15-10.23.22.716000) at position 25 (0): Unexpected character It seems its having a problem with too much accuracy in DB2 timestamp. Can I somehow force connection to change timestamp format with it is fetching data into?

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  • Got a question I don't understand, can anyone make sense of it?

    - by user275074
    Question on a on-line resource paper: Create javascript so that the following methods produce the output listed next it. circle = new Circle(); console.log(circle.get_area()); // 3.141592653589793 circle.set_radius(10); console.log(circle.get_area()); // 314.1592653589793 console.log(circle); // the radius of my circle is 10 and it's area is 314.1592653589793 Can anyone understand what is being asked?

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  • sql server query/subquery question

    - by parminder
    Hi Experts, I have a tables with data like this Id BookId TagId 34 113421 9 35 113421 10 36 113421 11 37 113421 1 38 113422 9 39 113422 1 40 113422 12 I need to write a query (SQL Server) which gives me data according to the tags say if I want bookIds where tagid =9 it should return bookid 113421 and 113422 as it exists in both the books, but If I ask data for tags 9 and 10 it should return only book 113421 as that is the only book where both the tags are present. Thanks Parminder

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  • Android hosts file usage

    - by dominos
    I have the following problem: I make a custom hosts file to test some features of my application and then push it to my android emulator. The thing is that these settings do not take effect immediately. I have to wait about 10 minutes before they become active. So my question is: how to make the new hosts file active instantly? I have many different settings to test and I can't wait 10 minutes every time.

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  • Controling page number shown in printing dialog

    - by Matthias Wandel
    I'm trying to implement printing a range of pages in c# While printing, the .net framework throws up a message box that says "Page # of document". This starts at 1, and counts up to the number of pages printed. If I'm printing pages 10-11, I want that count to start at 10, not 1. Is there a way to set the starting value? The logical thing would be if it started at PrinterSettings.FromPage, but it ignores that value.

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  • regular expresson of variables

    - by Kevinniceguy
    what is re of string of 0 and 1 that contain an even number of zeros and even number of ones..... its not or in the middle....its an and...and even number of ones so i got something like (1*01*01*)*(0*10*10*)* does it look good?

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  • (gcc) Multi-Dim Array or Double Pointer for Warning-free Compile

    - by paul simmons
    Hi, I have a function, which is called sometimes with regular, sometimes dynamic arrays. If I define the function as function_name(int[10][10] a) and send int** as a parameter, I get a warning. Opposite, if I declare function_name(int** a) and send int[][] as a parameter (after casting) I cannot access to array elements inside function. What is the correctest way?

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  • jquery adding new class aconfiguration on id?

    - by dupdup
    <area shape="poly" coords="63,10,64,38,89,37,91,10" class={"strokeColor:'0000ff',strokeWidth:5, fillColor:'ff0000',fillOpacity:0.6}" href="#" id="x1"> There is a imagemap in my html and I want to dynamicly add a new configuration "alwaysOn:true" to the class attribute. $("#x1").click(function(){alert(8);}) I am newbea I can add click listener to it but cannot figure out how to add config option How can I do that with jquery?

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  • Formula for popularity? (based on "like it", "comments", "views")

    - by paullb
    I have some pages on a website and I have to create an ordering based on "popularity"/"activity" The parameters that I have to use are: views to the page comments made on the page (there is a form at the bottom where uses can make comments) clicks made to the "like it" icon Are there any standards for what a formula for popularity would be? (if not opinions are good too) (initially I thought of views + 10*comments + 10*likeit)

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  • CheerryPy and concurrency

    - by RadiantHex
    Hi folks, I'm using CheeryPy in order to serve a python application through WSGI. I tried benchmarking it, but it seems as if CheeryPy can only handle exactly 10 req/sec. No matter what I do. Built a simple app with a 3 second pause, in order to accurately determine what is going on... and I can confirm that the 10 req/sec has nothing to do with the resources used by the python script. __ Any ideas?

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  • Number of elements in Python Set

    - by Tim
    I have a list of phone numbers that have been dialed (nums_dialed). I also have a set of phone numbers which are the number in a client's office (client_nums) How do I efficiently figure out how many times I've called a particular client (total) For example: >>>nums_dialed=[1,2,2,3,3] >>>client_nums=set([2,3]) >>>??? total=4 Problem is that I have a large-ish dataset: len(client_nums) ~ 10^5; and len(nums_dialed) ~10^3.

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  • To check the default select value tag!

    - by Small Wolf
    I have a question.Here is the code! f.select(:departments,Department.all.collect{|c|[c.name,c.id]},{},:size=>10,:multiple => ture) class Emergency has many :departments end the html source like this: <select id="emergency_departments" multiple="multiple" name="emergency[departments][]" size="10"><option value ="">""</option>....</select> now I want to get the default selected tag , who can tell me how ?

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  • Android ListView in Activity

    - by Dev.Android
    My layout is like this Title Layout Listview BottomLayout. I have an 150 item which i have custom layout which i want to add in listview. So my main problem is i want to add slowly slowly one by one that customlayouts in listview. So whenever the first screen is displayed i want load 10 items from server and add it to listview.then onscroll down i want to load the remaining 10 items from 150 cutom layouts. So how can I do this activity?

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  • Converting a pointer C# type to F#??

    - by Brendon
    Hello all I am just a beginner in programing i wish covert some code from C# to F#, I have encotered this code: "float[] v1=new float[10]" I need to use this pointer to pass to the function: "ComputeBuffer bufV1 = new ComputeBuffer(Context, ComputeMemoryFlags.ReadWrite | ComputeMemoryFlags.UseHostPointer, v1);" If i creat an array in F# like this: "let v1 = [| 1.0..10.0 |]" and call now the funaction like this: "let bufV1 = new ComputeBuffer(Context, ComputeMemoryFlags.ReadWrite ||| ComputeMemoryFlags.UseHostPointer, v1)" Is it an error?? How do i pass a pointer??

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