[RE-wrenches] Bifacial modules

[Bill Brooks]

Keith,

 

This is easy to test. Simple take an irradiance sensor, turn it upside-down
and test the irradiance on the bottom surface of any PV array. It will vary
greatly based on exposure to reflected light and so on, but it will rarely
be above 100 W/m^2. 10% improvement is an absolute maximum for any bifacial
technology, and that is on the high side. Any claims above 10% are ignoring
the physics of sunlight, reflectance of typical materials, and PV.

 

Nothing wrong with bi-facials. They are beautiful to look at. I would buy
them based on aesthetics, not on performance.

 

Bill.

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Keith Cronin
Sent: Tuesday, November 01, 2011 1:04 PM
To: RE-Wrenches
Subject: [RE-wrenches] Bifacial modules

 

Hi

 

Was wondering if any of you have installed bifacial modules and know what
the % of light that comes through to a surface below the modules?

 

Looking for a canopy type of installation/ application and wondered if you
have any #'s?

 

Thank you~

 

Aloha,

Keith

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