[RE-wrenches] Need help to get power torque wrench

[Jeff Clearwater, Village Power Design]

Hey Darryl,

I agree with Jason.  We've done some commercial S5 systems and we 
pre-tighten with a cordless driver and then two guys follow with a 
couple of manual torque wrenches  - it takes but a few seconds to 
turn the final 1/2 turn to the right torque - felt and confirmed by 
human feel and eyes.  We used digital beeping torque wrenches for a 
while but they would eventually fail.  Our tool of choice now is a 
1/4" drive hand held good - ole "click" type torque wrench.  Worth 
the very little bit of extra time in my book to know it's done right.

Jeff Clearwater
NorthEast Solar/Village Power Design






>Hello Darryl,
>I am a big fan of manually tightening all bolts and panel clips on 
>any array. I have done this on a MW tracker and racking systems on 
>schools, which were checked by a special inspector who required them 
>to be hand torqued and yes it's a lot, but in many peoples minds 
>hand tightened is worth it. I do know folks who use a cordless drill 
>and turn the setting down so as not to strip bolts and then go 
>through and torque by hand.
>
>Mostly this is a personnel opinion on the process and wanted to 
>relay my experiences.
>
>
>On Tue, Nov 11, 2008 at 6:04 PM, Darryl Thayer 
><<mailto:daryl_solar at yahoo.com>daryl_solar at yahoo.com> wrote:
>
>Hi all, I need advice
>I am soon starting a 1000 module system, uning top down mounts, What 
>power tools will tighten to torque specification?  I will want to 
>tighten each SS 1/4" nut on bolt to proper specs.  This is about 
>2000 bolts, so i want a power tool, either air or battery electric, 
>or electric that will tighten to specification.
>
>Thanks Darryl
>
>
>
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>--
>Jason Lombard
>Open Hand Solar LLC.
>HC74 Box13
>Pecos, NM. 87552
>505 795 8646
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-- 
~~~~~~~~~~~~~
Jeff Clearwater
Senior Design Engineer
NABCEP (tm) Certified Solar PV Installer
http://www.nabcep.org/
Village Power Design
Turnkey Solar Design & Installation for the Commercial Sector
http://www.villagepower.com
gosolar at villagepower.com

Voice: 413-259-3776
Fax: 413-825-0703
65 Schoolhouse Rd
Amherst, MA 01002
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