Re: [RE-wrenches] Aluminum Module Frame To Galvanized Uni-Strut

[Kent Osterberg]

Gary, Zinc (galvanizing) is more anodic than aluminum so it is protective of the aluminum just as it is of the steel in the Unistrut. As long as the installation is in a location that doesn't routinely have high humidity, the Unistrut should last nearly as long as it normally would. Are end cuts of the Unistrut painted with galvanizing or stainless paint? Kent Osterberg Blue Mountain Solar, Inc. Gary Willett wrote: It was brought to my attention that I had an error in my original post. Here's the corrected text: Fellow Wrenches: I am involved in the commissioning of a 300kw parking structure PV system and have a concern about possible galvanic action between the aluminum module frames and the stainless GALVANIZED steel uni-strut. The installation contractor attached the PV modules using a WEEB-like stainless steel top-mounted clamp (to pierce the top of the PV frame). A stainless steel bolt connects the clamp to the channel nut. The bottom of the PV module is resting on the galvanized uni-strut. Should there also be a WEEB-WMC assembly between the PV module and the uni-strut? Anyone have any experience where direct contact of these dissimilar metals became an issue over time? -- Regards, Gary Willett, PE Icarus Solar Services LLC NABCEP Certified Solar PV Installer g...@icarussolarservices.com On 7/12/2011 5:23 PM, Gary Willett wrote: Fellow Wrenches: I am involved in the commissioning of a 300kw parking structure PV system and have a concern about possible galvanic action between the aluminum module frames and the stainless steel uni-strut. The installation contractor attached the PV modules using a WEEB-like stainless steel top-mounted clamp (to pierce the top of the PV frame). A stainless steel bolt connects the clamp to the channel nut. The bottom of the PV module is resting on the galvanized uni-strut. Should there also be a WEEB-WMC assembly between the PV module and the uni-strut? Anyone have any experience where direct contact of these dissimilar metals became an issue over time? -- Regards, Gary Willett, PE Icarus Solar Services LLC NABCEP Certified Solar PV Installer g...@icarussolarservices.com

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