William,
All of our off grid is residential. In general we never do ground mount for off grid. With rare and specific exception we use pole-top racking. This is simply because pole top racks hold the entire array in balance over a single pivot, making seasonal adjustment easy for one person. Ground mount puts the pivot at the bottom edge of an array, requiring at least two people to adjust: one or more to lift and one to loosen/tighten the leg sliders.

Knowing the depth of your professional competence, you know this already, and this request is about a specific job. But most off-grid Wrenches may be in the same case, and thus not able to easily answer your question.

Having used UniRac a few times for adjustable roof/ground racking, I certainly would recommend against their adjustable tilt legs. Too easy for homeowners to loosen the pinch bolt too far and lose the twist-nut. In years past (I haven't used it in recent years) DP&W made good adjustable racking.
Allan

Allan Sindelar
[email protected]
NABCEP Certified Photovoltaic Installer
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Positive Energy, Inc.
3201 Calle Marie
Santa Fe, New Mexico 87507
505 424-1112
www.positiveenergysolar.com




On 3/23/2012 8:04 AM, Solarguy wrote:

 

Sunearth CompRail is an edge captive type railing that works great when rear access is possible. Its positive steel to steel attachment with SS bolts and threaded inserts is superior to Unirac Sunframe with its sheet metal attachment screw mount.

http://sunearthinc.com

 

Jim Duncan

North Texas renewable Energy

www.ntrei.com

NABCEP PV 031310-57

TECL-27398

[email protected]

817.917.0527


-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of William Miller
Sent: Friday, March 23, 2012 2:21 AM
To: RE-wrenches
Subject: [RE-wrenches] Off-grid ground mount

 

Friends:

 

I am curious about what the rest of you are using for off-grid ground mount

racks.   We need a tilt angle of 45 degrees.

 

Thanks in advance.

 

William Miller

 

 

Miller Solar

Voice :805-438-5600

email: [email protected]

http://millersolar.com

License No. C-10-773985

 

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