[RE-wrenches] Fwd: Re: Cantilevered array

Tue Feb 13 08:03:42 PST 2024

Good question about rain shedding.

My questions for Sky:  were the installations evaluated by a structural
engineer to calculate ability to withstand wind effects and snow load?
What roof anchors were recommended?

William Miller
Miller Solar.com
805-438-5600
www.millersolar.com

On Tue, Feb 13, 2024 at 7:55 AM Drake Chamberlin via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> If the array covers the rain gutters, doesn't that prevent the gutters
> from catching rain? Doesn't the edge of the extended modules form a drip
> edge, where water will not be diverted by the gutters, but hit the ground
> directly?
>
> Will the gutters be accessible for future maintenance?
>
>
> *Drake Chamberlin*
>
> *Athens Electric LLC*
>
> *Ohio Electrical Contractor’s License 44810*
>
> *NABCEP Certified PV Installation Professional*
> ---
>
>
>
> On 2024-02-12 11:02, Christopher Warfel wrote:
>
> Hi, in what way?  The loading is obviously less, and the clamps are rated
> for the load.
> On 2/12/2024 10:56 AM, drake.chamberlin at redwoodalliance.org wrote:
>
> How do you deal with the rain gutters?
>
>
> Drake Chamberlin
>
> Media & Communication Action Project
>
> https://m-cap.org/
> ---
>
>
>
> On 2024-02-08 16:46, Sky Sims via RE-wrenches wrote:
>
> I've designed and installed several thousand cantilevered arrays over the
> last three decades and never had a single issue. Unfortunately, code
> changes have taken a turn for the worse in most jurisdictions and
> oftentimes disallow cantilevering.
>
> Sky Sims
> Https://EcologicalSystems.org
> 732-462-3858
>
> On Jan 19, 2024, at 3:09 PM, Christopher Warfel via RE-wrenches
> <re-wrenches at lists.re-wrenches.org> <re-wrenches at lists.re-wrenches.org>
> wrote:
>
> I've done a fair amount of roof mounted solar structural compliance, and
> I would say that the cantilevered design looks like a disaster waiting to
> happen. You could not use conventional solar racking products.  Chris
>
>
>
> On 1/13/2024 12:42 PM, William Miller via RE-wrenches wrote:
>
> Drake
>
>
>
> My earlier reply may have been a bit facetious.  What I meant by it was
> that big-box solar contractors can be lazy when it comes to solar design.
> They will rely totally on satellite imagery and not check the design on the
> ground.  This is how you get solar proposed for shaded areas, where
> skylights and roof vents are located, or overhanging thin air.  This may be
> what is happening in the image you shared.
>
>
>
> What is unique here is someone actually specified overhanging panels.
> Looking more closely at the image, a roof outline is shown but it is not
> clear that the outline is actually situated over a building.  It almost
> looks like there is landscaped area inside the outline.
>
>
>
> The solution of course is to get on out there, measure the roof and any
> obstructions and analyze the shading.  I use the Sun Seeker
> <https://apps.apple.com/us/app/sun-seeker-tracker-surveyor/id330247123>
> app for IOS for the shading analysis.
>
>
>
> William
>
>
>
> Miller Solar
>
> 17395 Oak Road, Atascadero, CA 93422
>
> 805-438-5600
>
> www.millersolar.com
>
> CA Lic. 773985
>
>
>
>
>
> *From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
> Behalf Of *Drake Chamberlin via RE-wrenches
> *Sent:* Saturday, January 13, 2024 8:47 AM
> *To:* RE-wrenches
> *Cc:* drake.chamberlin at redwoodalliance.org
> *Subject:* [RE-wrenches] Fwd: Re: Cantilevered array
>
>
>
>
>
>
>
>
>
>
>
>
>
>
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>
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>
>
> Here is a larger snip of the situation.
>
>
>
>
> <image001.png>
>
> Label says overhang from upper roof.
>
>
>
> *Drake Chamberlin*
>
> *Athens Electric LLC*
>
> *Ohio Electrical Contractor's License 44810*
>
> *NABCEP Certified PV Installation Professional*
>
>
>
> ---
>
>
>
>
>
> On 2024-01-12 07:29, Jason Szumlanski wrote:
>
> Are you sure that's what you're looking at? To me, that looks like there
> was an addition made to the house, and maybe it's a multi-pitch roof. That
> lower part might be a covered wrap-around porch.
>
>
> Jason Szumlanski
>
> Principal Solar Designer | Florida Solar Design Group
> NABCEP Certified Solar Professional (PVIP)
> Florida State Certified Solar Contractor CVC56956
>
>
>
> On Thu, Jan 11, 2024 at 5:59 PM Drake Chamberlin via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
> I was given a drawing, produced by a very large solar company, showing the
> array cantilevered over the edge of the roof by several feet.
>
> <image002.png>
>
>
>
> Notice how the array hangs out over the lawn for several feet. Is there
> anyway that this is a legitimate way to mount modules?
>
>
>
> Thanks,
>
>
>
> Drake
>
>
>
> *Drake Chamberlin*
>
> *Athens Electric LLC*
>
> *Ohio Electrical Contractor's License 44810*
>
> *NABCEP Certified PV Installation Professional*
>
>
>
> --
>
>
>
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> --
>                                          Christopher Warfel
>                      ENTECH Engineering, Inc.
> PO Box 871, Block Island, RI 02807
>                                                             401-466-8978
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>        Christopher Warfel
>           ENTECH Engineering Inc.
>    PO Box 871, Block Island, RI 02807
>                   401-477-5773
> [image: EE Logo] <https://entech-engineering.com/Home/default.php>
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