[RE-wrenches] Best angle - direct grid tie

[Dave Click]

0.9 x latitude seems to be a good rule of thumb for direct grid-tie systems.

-------- Original Message --------
Subject: Re: Malabar Cove  Solar Array
From: ScottT <Schroeders_Homes_Supers at DSchroeders.com>
To: Dave Click <daveclick at fsec.ucf.edu>
Date: 2010/1/2 12:39

> Hello Wrenches,
>
> My Solar Pathfinder Assistant (SPA) claims that the optimum tilt angle
> for the solar modules is latitude. I'm skeptical. The system being
> designed is a direct grid tie, ground mount.
>
> It seems to me that an angle of latitude will give a balanced angle for
> both summer and winter charging. Since there is far less energy
> available in the winter, is this balance really the best. Also, a
> flatter angle in the summer should gain more hours of sun, since the sun
> goes N of the E-W axis.
>
> With ballasted systems, the 15 degree angle is supposed to work just
> fine, due to better summer charging. Does anyone have an answer to what
> really is the optimum tilt angle for a direct grid tie system? Is the
> SPA geared toward off grid systems, or is latitude really the best?
>
> Thank you and best wishes for the New Year,
>
> Drake Chamberlin
> Athens Electric
> OH License 44810
> CO License 3773
> NABCEP TM Certified PV Installer
> Office - 740-448-7328
> Mobile - 740-856-9648
>
>
>
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