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Off grid DC power supply question


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#1 D-C

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Posted 07 November 2011 - 02:24 PM

Hi all. I currently run off my 12v house system, through an inverter, then into the ?brick? for my HP dv5000 notebook, which then provides 18.6 DCv to my puter. I see a cheap adapter on Ebay that lists 20 volts as its output. I'm thinking it would be more efficient to skip a step, (inverter), and run on that. Any thoughts on if this might over volt the puter or cause trouble with the batteries? Thanks, Don.

Edited by D-C, 07 November 2011 - 02:25 PM.


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#2 Sneakycyber

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Posted 07 November 2011 - 04:39 PM

I would be leery of "cheap" adapters they tend to have inferior components and do not accurately provide the proper power (Wattage or Voltage) output. 20VDC may not fry your laptop but I wouldn't suggest it, The more power you feed it that it doesn't use it has to dissipate as heat.
Chad Mockensturm 
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#3 D-C

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Posted 07 November 2011 - 11:24 PM

Much thanks. Partly with your inspiration I searched a little better and found a still "affordable" ($16), 18.5 Volt from China that mentions HP. Am curious at what low voltage this HP shuts down off it's own batteries. I looked at the battery case thinking of putting a pig-tail out so I could monitor the exact voltage, but the blade/plug was so fine I didn't want to mess with it. I'll try to get back with how the Chinese supply works, if it's more efficient. (drawing around 2.7 A now) Thanks again, D.




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