Pressure Treated Ground Mounts [RE-wrenches]

[Roy Butler, Four Winds RE]

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Hi Jeff,

We install quite a few PT ground mount systems each year for our 
off-grid customers....probably have about 25 of this type out there now. 
But we only use that as a base for a manufactured adjustable tilt ground 
mount system. I would never mount modules directly to the 
wood...dis-similar material expansion/contraction issues...wood 
shrinkage/ warpage issues....all would stress the module.

For smaller systems (under 1KW) we use 4x4 posts...for larger, 6x6s. A 
full 4 feet in the ground (frost line here).
As for the horizontal rail size and post spacing....it's like planning 
floor joists....depends on the load and span.

If you want some specs and pics please contact me off list. FYI....I'm 
in Western NY where the winters are tad worse than where you are....so 
the type of construction we use should be more than adequate for your area!

-- 
Roy Butler
NABCEP Certified Solar PV Installer™
Four Winds Renewable Energy, LLC
8902 Route 46
Arkport, NY 14807
607-324-9747
www.four-winds-energy.com
NYSERDA eligible PV installer for PON 716
NYSERDA eligible wind installer for PON 792



Jeff Irish wrote:

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>Dear fellow Wrenches,
>
>Any advice out there regarding constructing pressure treated ground mount
>structures for PV systems for the northern half of the country?  What column
>size (4x4?), what spacing?  What size cross bracing?  Nails, lags screws or
>bolts to hold it all together?  Mount the modules to the wood directly, or
>use steel Unistrut, or extruded aluminum rails like Solarmounts?  Any
>galvanic corrosion issues with steel?  Any advice about what works and
>doesn't work would be appreciated.
>
>Jeff Irish
>Hudson Valley Clean Energy, Inc.
>New York State
>
>  
>

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