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[aprssig] Power For a Lap Top

Gerry Creager N5JXS gerry.creager at tamu.edu
Sun Aug 28 13:50:14 UTC 2005


Having fried an inverter doing this (but not with an Armada) make sure 
your inverter is rated for the max current of the power supply... and a 
bit (say, 25%) more.  The startup surge of the power supply and computer 
will be what'll fry the inverter's electronics and there's not much 
ferrite in the output of the inverter to help it cope.

For my Dell Latitude D600, I use a 140 watt inverter to run a 90 watt 
supply.  I tried a 90 watt inverter and it lasted through one trip in a 
rental car... exactly what I needed but a costly learning opportunity.

gerry

Ron wrote:
> Just wondering of any precaution when operating a Lap Top (Compaq Armada 
> 3500) from a 12 VDC to 110 VAC inverter.  I heard of a case where 
> someone tried a cell phone charger only to fry the power supply.  I 
> question that since the cell PS is low current draw and not much iron in 
> the transformer that spikes may have played a roll in this accident or 
> may be it was just that time for the transformer to go?  Thanks for your 
> thoughts.
> WA2WWK
> Ron
> 
> 
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-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University	
Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.847.8578
Page: 979.228.0173
Office: 903A Eller Bldg, TAMU, College Station, TX 77843




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