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Solar Project to Power Computers during daytime - Page 2

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Posted by Roderick on August 27, 2008, 6:05 pm
 

If you went with a grid-tied array with an operating voltage of
between 150 and 340 volts, it might be possible to plug your servers
directly into the array.  Line switching (transformerless) power
supplies that say "100 - 240 VAC" on can really run on any voltage in-
between.  You have to be careful of the ones that say 100-125 VAC or
208-250 VAC", because those have a switch or relay to select the input
voltage range, and are not as versatile.  Anyway, 120 VAC is
immediately rectified inside the power supply, where it becomes 170
VDC.  So you should be able to just connect 170 VDC from the array in
its place, or any voltage up to double that.  If you planned to run
those same servers at night, you could have a transfer switch to
change over to grid power.  It could also be done automatically with
blocking diodes, but that would be against NEC code.  Obviously,
dealing with power systems is a dangerous thing to do, and no one will
guarantee that this sort of scheme will work, myself included.  You
take your own risks.  But bat the idea around with an Electrical
Engineering friend, and see if it has merit.

Posted by busdweller on August 22, 2008, 1:28 pm
 

Hi Scott

Something like this may do it for you. I built this solar bungalow to
stay in when I have to go out of town for work. 9/51 watt panels, 8/6
volt golf cart batteries wired for 12 volts and a 1000 watt Xantrex
Freedom inverter/charger. It will power almost anything. It hinges on
both sides.

[IMG]http://i33.tinypic.com/97jfk6.jpg [/IMG]
[IMG]http://i37.tinypic.com/4kpdy.jpg [/IMG]
[IMG]http://i34.tinypic.com/2cmxmw8.jpg [/IMG]

Peace along the way
Dennis the bus dweller N.Y.

Posted by Eeyore on August 22, 2008, 3:41 pm
 

busdweller wrote:


How much did all the parts cost ?

Graham


Posted by Ed Lomax on February 25, 2009, 5:31 am
 In article


Very nice bungalow!

How much installation experience did you have prior to this one? (I am a
newbie considering a similar project)

What did this project cost you in time and $$$?

TIA.

Posted by Eeyore on August 22, 2008, 3:36 pm
 

Scott Kraemer wrote:


Free ? Bwahahahahahahaaa !

Wait til you see the cost of the panels and inverters.

Graham


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