[RE-wrenches] PV on north roof

Sun Feb 21 19:15:46 EST 2021

I remember the first time I saw East-West racking on a roof from an
airplane some years ago. I was initially confused as it was the North
facing side of the roof and the south side was a typically jam-packed flush
mount install. Quite quickly I smiled thinking that's one way to take
advantage of limited roof space and substantially decreasing PV prices.

This method, the East West rack up on the North side, can be advantageous
to trying to 'back rack' the North side of an array to face south again,
especially in high wind areas with multiple rows where you have to leave a
massive space for inter row shading, much less the inevitable aesthetic
comments.
;-)
Best of luck, the attached shows a photo of how E-West racking on the North
roof can work.

On Sun, Feb 21, 2021 at 6:41 PM <re-wrenches-request at lists.re-wrenches.org>
wrote:

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>    1. Re: PV on north roof (Jerry Shafer)
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> Message: 1
> Date: Sun, 21 Feb 2021 14:27:57 -0800
> From: Jerry Shafer <jerrysgarage01 at gmail.com>
> To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
> Subject: Re: [RE-wrenches] PV on north roof
> Message-ID:
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> HgJKEgqgnA3baHGgKmg-+ydkeGNjZvjbfg at mail.gmail.com>
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> Wrenches
> Low pitch, close to the tropic of cancer with a reverse tilt it works, you
> just need to consider the tilt to the south 15 degrees maybe, l have
> customer all over Hawaii and some are north low pitch because we are south
> of the tropic line the sun is actually in the north sky for a short part of
> the year. You just need to do the right engineering to see what you need
> Jerry
>
>
> On Sun, Feb 21, 2021, 1:00 PM Kirk Herander, VSE <kirkh at vermont.solar>
> wrote:
>
> > All,
> >
> > Apparently this is not necessarily a bad idea anymore (from what I recall
> > some pv gurus saying a few years back), relevant to latitude and pitch of
> > the roof. I have a client in Florida it might work for, and there in no
> > room left on the ground or other roofs. Anyone have a resource or rules
> of
> > thumb for such a thing?
> >
> > *Kirk Herander / **kirkh at vermont.solar <kirkh at vermont.solar>*
> >
> > *Owner|Principal, VT Solar, LLC*
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