pre-engineered ground racks [RE-wrenches]

[Jerry Caldwell]

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Thanks for the input Marco, Graham, William & Jeff,

This is going to be a 12kW system on the side of a
hill that changes slope in the middle of the array
which I want to remain in one plane.  The lower part
of the hill is steeper at about 30 degrees and the
upper part is less steep at about 15 degrees.

I can separate the arry on two racks so that about 3kW
will be on the 15 degree part of the hill, but the
rest will have to be over the area where the hill
changes grade.

I agree that the Pro Solar and DPW products look
easier and simpler than Unirac, but the Unirac large
array product looks stronger with the larger pipe &
cross bracing.  I've also gotten grief from plan check
engineers at local municipalities in the past and have
had to over engineer systems on hillsides to
ridiculous extremes (3'diameter, 10' deep piers for
top of pole mounts).  Here in Northern California
there are concerns with erosion and mudslides.  I'm
hoping a manufacturer's product which has been stamped
by a licensed engineer for this application will be
more readily accepted to be installed to the
manufacturer's recomendations.

Jerry

--- "Jeffery Wolfe, Global Resource Options"
<jeff at globalresourceoptions.com> wrote:
>  
> 
> Jerry,
> 
> In your area of the country, you can use the PSP. In
> snowy areas (or any
> area you want to elevate the area above the ground
> by a couple feet or
> more in the front) you need to use the UniRac ULA
> system with 2" pipe.
> From what I know, both systems work fine, just that
> 2" pipe lets you
> have a longer pipe sticking out of the ground,
> whereas 1 1/4" pipe does
> not have enough bending strength to take the longer
> lengths.
> 
> Jeff
> Jeffery D. Wolfe, P.E.
> NABCEP Certified Solar PV Installer(tm)
> Global Resource Options, LLP, Solar  Wind  Energy
> Solutions
> A Woman-Owned Limited Liability Partnership
> 601 Old River Road, Suite 3, White River Junction,
> VT 05001-9030
> 
> -----Original Message-----
> From: Marco Mangelsdorf [mailto:marco at pvthawaii.com]
> 
> Sent: Friday, July 23, 2004 9:06 PM
> To: RE-wrenches at topica.com
> Subject: RE: pre-engineered ground racks
> [RE-wrenches]
> 
> Jerry,
> 
> I'd go with Stan Ulman and his Professional Solar
> Products ground-mount
> hardware (www.prosolar.com).  Stan has done all the
> necessary
> engineering for his mounting hardware and is a very
> helpful guy to deal
> with.  (And, no, I don't work for PSP.)  Aside from
> the anodized al.
> rails and other hardware he supplies, you would be
> using 1 1/4" gal.
> pipe as posts sunk in concrete every 10'.  His
> phone: 800 847-6527.
> 
> aloha,
> marco
> ProVision Technologies, Inc.
> Hilo, Hawai'i
> 
> -----Original Message-----
> From: Jerry Caldwell [mailto:solarcowboy at yahoo.com]
> Sent: Friday, July 23, 2004 2:58 PM
> To: RE-wrenches at topica.com
> Subject: pre-engineered ground racks [RE-wrenches]
> 
> Wrenches,
> 
> I need to quote a PV system with a ground rack on
> the side of a hill.
> I'm thinking about going with a pre-engineered
> system like Unirac to
> save time both with design and installation.  Does
> anyone have
> experience with Unirac's large ground rack product
> or anyone else's for
> that matter.  Basically, I'm looking for opinions
> pro or con using a kit
> system for this application vs. building our own
> with galvanized pipe &
> strut.
> 
> cheers,
> 
> =====
> Jerry Caldwell
> NABCEP Certified PV Installer
> Light Energy Systems
> 965 Detroit Ave
> Concord, CA
> 
> 925-680-4343 office
> 510-205-2798 mobile

=====
Jerry Caldwell
NABCEP Certified PV Installer
Light Energy Systems
965 Detroit Ave
Concord, CA

925-680-4343 office
510-205-2798 mobile


	
		
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