Subject: Re: [linux-audio-dev] OT: Electronic advice for PC.
From: Patrick Shirkey (kotau_AT_firstlinux.net)
Date: Tue Apr 30 2002 - 17:39:26 EEST
>1.) Required voltage. What voltage is needed? If this is going to be driving
>an inverter, 12V is typical.
Why would I need an inverter if the power level from the batteres are correct in the first place?
From my research so far I have estimated that the machine would draw about 12v maximum.
Can anyone confirm or deny whether this is correct?
The machine is:
pIII 1ghz cpu
mainboard
cooling fan
256MB sdram
onboard vga
onboard sound card
onboard lan
1x hdd(notebook size)
cdrom
dvd
possible pci soundcard for pro recording.
>2.) Required current. At the required voltage, how much current does the PC
>draw? This is necessary for the next criterion:
Does anyone know what this would be based on the above hardware?
>3.) Required battery run time. How long do you want the battery to provide
>required voltage at the required current? Battery capacity is rated in
>ampere-hours (AH) -- suppose your PC draws 5A at 12V -- and you want to run
>10 hours. 5x10=50AH. That is a little larger than a motorcycle battery. My
>Sony Vaio notebook has twin 3000mAH Li-Ion batteries. It runs for about 2.5
>hours. This means it is drawing 6000mAH/2.5H= 2400mA=2.4A. Of course, the
>Li-Ion discharge curve being what it is, this is approximate at best.
I would say 6 hours would be about right. Most performances don't last much longer than that. Of course more would be better but this thing has to be easily lifted - eg shoulder strap - as I expect people will want to use it in the field.
Another question that I'm unsure of is whether having a battery that is too powerful for the machine is going to cause problems or is that not possible because the machine will just run for longer? Or is that where an inverter comes in?
-- Patrick Shirkey - Boost Hardware Ltd For the discerning hardware connoisseur http://www.boosthardware.com http://www.boosthardware.com/LAU/guide/_____________________________________________________________ Want a new web-based email account ? ---> http://www.firstlinux.net
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