[RE-wrenches] Bifacial modules

Keith Cronin electrichi01 at yahoo.com
Tue Nov 1 19:48:07 PDT 2011


Bill

Appreciate the feedback. One of the questions that I'm seeking to determine- how much light will filter through the spaces between the cells to the surface below?

Lets say for someone that wants to grow orchids- they need low light, as an example.

Wondering how much light is diffused through the panels to be able to do things like grow orchids and or have filtered light to work?

As an example: Do any of you have irradiance measurements on any carports that have done bifacials and determined how many watts sq m are below?

Keith


________________________________
From: Bill Brooks <billbrooks7 at yahoo.com>
To: 'Keith Cronin' <electrichi01 at yahoo.com>; 'RE-wrenches' <re-wrenches at lists.re-wrenches.org>
Sent: Tuesday, November 1, 2011 11:44 AM
Subject: RE: [RE-wrenches] Bifacial modules


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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