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07-09-2009, 09:50 AM
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#1
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Newbie
Join Date: Apr 2009
Location: Cocoa, Fl
Posts: 35
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Backup battery
Anybody ever use a UPS (uninterrupted power supply) to power their pc for a little while so it can update or sync without having to have the car running?
Last edited by HumungousBacon; 07-09-2009 at 11:12 AM.
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07-09-2009, 11:01 AM
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#2
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Neither darque nor pervert
Join Date: Apr 2004
Location: Elsewhere
Posts: 12,910
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They are big, heavy, and they don't like cheap inverters.
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07-10-2009, 12:01 AM
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#3
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Newbie
Join Date: Apr 2009
Location: Cocoa, Fl
Posts: 35
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07-10-2009, 03:16 AM
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#4
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Fusion Brain Creator
Join Date: Mar 2006
Location: Colorado, but Canadian!
Posts: 8,862
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Quote: Originally Posted by HumungousBacon 
why do you need a 
What DP said is exactly true...
I read a while back someone was using some serial connection to a PIC they programmed and a spare battery on a tank circuit.
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07-10-2009, 03:19 AM
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#5
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Low Bitrate
Join Date: Apr 2009
Location: Lost in Afghanistan
Posts: 96
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I'm not understanding why an UPS is needed, would the car battery not suffice?
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07-10-2009, 03:32 AM
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#6
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Variable Bitrate
Join Date: Mar 2009
Location: Kristiansand, Norway
Posts: 285
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That is my thoughts as well... What is an UPC??? A battery of course!
And bumping a post from yesterday is just plain rude!
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07-10-2009, 05:30 AM
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#7
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North of the land of Hey Huns
Join Date: Jun 2004
Location: Westminster, MD
Posts: 1,038
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As DP said, most UPS's don't like cheap inverters. We use Xantrex Pro Sine inverters at work because they play nice with UPS's, but they cost upwards of $1500. The key thing to look for is "true sine wave" inverters that put out a clean sine wave, UPS's are very finicky about their power input.
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07-10-2009, 06:11 AM
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#8
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Neither darque nor pervert
Join Date: Apr 2004
Location: Elsewhere
Posts: 12,910
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Quote: Originally Posted by Crinos That is my thoughts as well... What is an UPC??? A battery of course!
A UPC is a barcode issued by a product's manufacturer for inventory control.
A UPS (uninterruptable power supply) is a battery.
Quote:
And bumping a post from yesterday is just plain rude!
QFT!
__________________
LOOKING FOR THE FAQ? IT'S HERE.
You never found that link, did you? Why? It's hard to find in the NavBar across the top of the forums, amongst a lot of other crap.
TELL MP3CAR YOU WANT A LINK TO THE FAQ IN A MORE OBVIOUS, NOTICABLE LOCATION HERE.
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07-10-2009, 03:46 PM
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#9
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Newbie
Join Date: Apr 2009
Location: Cocoa, Fl
Posts: 35
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Just a simple question. didn't know all of that. i just don't want to leave my car running while i sync it with my home PC. was trying to figure out a way to power the PC without draining the car's battery. 
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07-10-2009, 04:07 PM
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#10
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Fusion Brain Creator
Join Date: Mar 2006
Location: Colorado, but Canadian!
Posts: 8,862
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Quote: Originally Posted by HumungousBacon Just a simple question. didn't know all of that. i just don't want to leave my car running while i sync it with my home PC. was trying to figure out a way to power the PC without draining the car's battery.
Well you will be draining a battery no matter what.
If you are planning on using it for long periods with the car off, I suggest a secondary battery system consisting of a deep cycle battery (can be discharged and charged to death lots of times without loosing much charge as compared to your standard lead acid which will never be the same after a deep discharge), a charging system that isolates the secondary battery from the car starting battery when off, and charges when on, and a smart DC-DC PSU for the PC.
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07-10-2009, 06:58 PM
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#11
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Newbie
Join Date: Feb 2008
Posts: 36
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Adding my 2 cents  I purchased a second wire harness and attached it to a PC power supply I had laying around. When I need to make large updates, tweaks, transfer songs, etc I run out an extension cord. Granted, the audio doesn't work as my amp isn't powered up but ... you get the picture.
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07-10-2009, 09:58 PM
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#12
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Low Bitrate
Join Date: Feb 2008
Posts: 81
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Just install another battery in the car. I have a 12v 7ah sealed battery under the hood. I have a relay between the main battery and it. If the key is off, the relay is off, that disconnects the main battery from the sound and computer system. If its left on or trickles dead, turn the key on, power is back, backup battery recharges.
Multiple relays or a large relay will be required for heavy duty audio/computer systems over 30ah of draw.
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07-11-2009, 12:03 AM
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#13
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Low Bitrate
Join Date: Apr 2009
Location: Lost in Afghanistan
Posts: 96
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It's possible to specify that the pc should shut down in xx minutes or something of the sort. You could possibly use this to leave it running long enough to sync.
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07-11-2009, 12:53 AM
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#14
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Newbie
Join Date: Apr 2009
Location: Cocoa, Fl
Posts: 35
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wow really negative rep wonderful guys thanks for the warm welcome.
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