[Cialug] tornado-proofing your data?

[Dave J. Hala Jr.]

You forget...I'm a bohemie with a welder. I'm fairly confident that I
would not build a structure to hold all those pv panels.  I'd probably
build a frame using a 14ga 1in box steel and 18ga sheet stock. I'd put
it 6-8 inches off the ground (so the bunnies could have a home) and then
I'd put up a 50in tall cattle panel fence around it to keep the dogs off
of it.  I realize that dogs and bunnies don't mix, but if you have an
ample supply of de-wormer and bunnies, you have happy dogs.

I've just finished the mockup of a prototype 2kw (in 25 mph wind)
horizontal axis wind generator that sits on the ground. Photos will be
available as soon as its painted and spinning in the back yard.

I'd use an Outback systems inverter to combine the two seperate power
sources and charge the battery. I wouldn't use the optima batteries.
They cost too much and only have a 3-5 year life. I'd purchase a 24 volt
forklift battery that has been recently taken out of service. There have
been numerous reports of re-purposed forklift batteries being used with
wind turbines and being in service in excess of 15 years.

:) Dave

On Wed, 2008-05-28 at 08:21 -0500, murraymckee at wellsfargo.com wrote:
> That's assuming that you built a structure strong enough to hold the
> panels against the wind during the storm.  And even if the frame holding
> the panels survived you'd have to contend with the panels being blown
> out of the frame.  
> 
> Murray McKee 
> Operating Systems Engineer
> WFFIS - Wells Fargo Financial Information Systems 
> 800 Walnut Street
> MAC F4030-037
> Des Moines, IA 50309-3605
> WORK (515)557-6127 Cell (515) 890-9660  FAX (515) 557-6046
> MurrayMcKee at WellsFargo.com 
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> -----Original Message-----
> From: cialug-bounces at cialug.org [mailto:cialug-bounces at cialug.org] On
> Behalf Of Dan Hockey
> Sent: Tuesday, May 27, 2008 11:11 PM
> To: 'Central Iowa Linux Users Group'
> Subject: RE: [Cialug] tornado-proofing your data?
> 
> * Backup onto a remote server located in the underground fruit cellar in
> the
> back yard.
> *Use a combination of a solar/wind power the power it.
> *Since you only need about 500 watts, you could do this for a reasonable
> cost.
> 
> Have you priced solar panels and batteries lately?
> 
> 500 watts x one hour = 500w/hr or 0.500Kw/hr
> 0.5Kw/hr x 24hrs = 12Kw/hr <- and that's just for one day.
> 
> Now for the battery pack..
> Using the Optima blue top (55ahr) for this example.
> 
> (55ahr x 12v) / 1000
>          660  / 1000
>          =0.66Kw/hr just for one battery.
> 
> 55ahr x 20 = 1100ahr
> 
> (1100ahr x 12v / 1000 = 13.2Kw/hr
> 
> 1 battery = $169.95 x 20 = $3399.00
> 
> Keep in mind your solar array is going to be 2x to 3x larger in order to
> charge the battery bank with the ~4hr of useable sunlight(for ia) for
> fixed
> solar panels.
> As you can see this is starting to get expensive to keep your data safe,
> that doesn't include the inverter and charge controller. You will be the
> only one in town with the highest uptime after the tornado blows
> through.
> -dh   
> 
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-- 
___
Dave J. Hala Jr.
President OSIS, Inc.
www.osis.us