Reroofing and installation time. [RE-wrenches]

[Joel Davidson]

If you install conventional roof stand-offs initially, you can re-roof around
them in the standard way, but sometimes you have to remove and re-install the PV
system. We designed and installed a 24 kW PV system on a Sacramento church as
part of a SMUD PV Pioneer contract. The Solec 80-watt modules were
shop-assembled and pre-wired into 7-module panels. The panels were fastened
directly to the roof plywood sheathing with wood screws. Four 6 kW Omnion
inverters and John Berdner's combiner boxes were used. Three years later, the
congregation wanted to re-roof their church. I hired a local, black-owned,
licensed electrical contractor with no PV experience and trained his crew
on-the-job (and paid union scale because SMUD is also practices affirmative
action and pays scale). The electricians removed the panels, c-boxes, j-boxes,
conduit and wire in 1 day and stacked the materials on the ground next to the
building. The roofer re-shingled the building and the electricians re-installed
the panels and wiring in 3 days.
Best regards,
Joel Davidson
February is Black History Month

William Miller wrote:

> Kids:
>
> The issue of reroofing has come up for discussion among our crew.  With a
> tilt up rack, I believe a roof can be replaced without removing the
> modules, especially comp roof:
>
> 1. The racks are tilted up and bolted to the factory provided aluminum legs.
>
> 2. The mastic is carefully removed as much as possible from around the feet
> using a heat gun and putty knife.
>
> 3. The lags are loosened and a flat bar used to pry the feet free of the
> roofing, one at a time.
>
> 4. The lags are removed and the roofing removed from under each foot (for a
> tear off).  The lags is temporarily replaced with care not to over torque.
>
> 4. The legs are lifted one at a time for the new shingles to be slipped
> underneath.  The weight of each leg is not too much for one person to lift
> and hold up for 2 to 3 minutes.  It takes only a few seconds to slip a
> shingle in place and it can be nailed with the foot resting on it.
>
> 5. New mastic is applied and a new lag is installed.
>
> This does require one of our crew to attend the reroofing of the section
> immediately under the racks.  This is far cheaper than the cost of three of
> us for two days, removing and replacing.  Granted, we have yet to try this.
>  If we ever do, we'll report on how it goes!  If this works, it would seem
> to be extremely advantageous over a top down rack.
>
> How about installation time?  With a crew of three using tilt up racks
> (Direct Power Two Tier usually) we can easy install 24 (even up to 30
> recently) large frame modules in two days.  This is from driving up to the
> job through installing the racks, running conduit to the inverter location,
> mounting modules, wiring, pulling feeders, testing and laying down the
> racks.  This results in a conduited installation without the nagging
> question of MC failure.  How does this compare with other crews?
>
> William
>
> At 08:55 PM 1/31/2003 -0800, you wrote:
> >Hey Mo,
> >
> >Congrat's on the Scripp's job, really cool.  I think the heat-shrink is
> >a great idea for the island.  My concern with its application on
> >rooftops is how do you remove it when it comes time for removal and
> >re-installation of modules for re-roofing, without the possibility of
> >cutting into the wire insulation?
> >
> >Graham
> >
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> __________________________________________________________________
> William Miller
> Miller Power and Communications
> PO Box 50, Santa Margarita, CA 93453
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