Linux - HardwareThis forum is for Hardware issues.
Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here.
Having a problem logging in? Please visit this page to clear all LQ-related cookies.
Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
Click Here to receive this Complete Guide absolutely free.
A DC-powered system for use off-grid will occasionally be used at grid-connected locations too. But fanless AC to DC adapters at the psu's rated 270W peak (or higher) are hard to find. The closest I have found so far is this one:
275watts peak, not 270. You shouldnt be going over 220 watts with that PSU. *edit- and you wont be going over 100-125 watts real usage from everything I know. Getting a 275 watt AC-DC converter 'just in case' would be pretty much pointless.
I have a good basic i7-3770 that I use on a kill-a-watt meter. I have never seen it go over 145W and that is the total of switch,router, Ooma, computer, audio system and monitor.
There was a site that was dedicated to DC home products. Everything from toasters to toothbrushs. Might try to see if they have products for your system. Even the best power inverters use a lot of power. I have a number of them and the best one I have is a tripp lite 3Kw model that shuts down on low use.
My inverter is a 3kW one too. It draws 10W for itself when in economy mode with a distorted sinewave. Or 15W in perfect sinewave mode. Plus the losses due to the 93% efficiency, probably another 8W with a 100W load. Definitely very wasteful, a DC psu is essential.
It's all in the internal design.
Given that the drive current is comparatively steady, you would expect the efficiency to rise as power output rises, but this isn't always the case.
Remember there are numerous supplies being fed from the one switching Tx. So to prevent overvoltage, the windings can't provide too much extra voltage (Otherwise you could get 18V on your 12V Line, or 7V on your 5V line). So there can come a stage when you are creating extra power (For, e.g. the 5V line) but not using it; so the efficiency goes down.
Inductors like anything tuned component have a 'sweet spot' efficiency wise, and this also affects efficiency.
Industrial stuff is way behind. They'd rather the thing work over it using less power. I guess there could also be some calculation issue between source and output that messes up the equation.
There are some web pages also on how to modify a standard psu that might work.
The other solution is to get a few power supplies that are 24V to the voltages and current you need.
There is a calculation between source and output on Linear supplies, which are grossly inefficient.
In Switch mode, not really - it's the inductor that makes sure of that. I would not be optimistic about modifying a standard psu to run off 24V, or finding reasonably priced equivalents. 5V 50A would be rare and never cheap. Ditto 12V 35-40A.