cost per kw installed [RE-wrenches]

[Graham Owen]

Hi William,

I still panelize SP75's in shop for flush mounted roof installs .  Heyco
Flex conduit between modules and ground each individual module.  For
ground mounts and racked up systems, with easy rear module access, I
like the SP140's and I still put conduit between the modules.  When I
need to access the rear side of flush mounted modules, it is easy to
undo four bolts and tilt up all four modules.  I prop them up with a
three foot section of 2x4 and crawl underneath.  I realize this wouldn't
be so easy on a steep pitch, but luckily I have not had to access the
back side of any modules (yet) on a steep roof.  The new Shell earthsafe
HV-100 systems give you the option of MC's or conduit.  I may start
installing SP140's on sloped roofs one module at a time with top-down
clamps and MC's.  I have heard that MC's installed on humid days can get
hot in the summer and open up a little bit. (does anyone have more info
on this?) I wish the PV manufacturers would make an approved grounding
point on the narrow end of the modules.  I believe most of the SMUD
installs are panelized in shop and a crane is used on each job to get
the panels on the roof.  If prevailing wage becomes required it is
cheaper to get as much work done in shop as opposed to time on the roof.

Graham

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