two arrays [RE-wrenches]

[David Katz]

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Hi Jeff,
I have ad an idea for a long time about a device that shorts one module 
in a series at a preset low temperature. It would act like a bypass 
diode on a shaded module controlled by a thermistor so at a preset 
temperature the array would drop in voltage. This would probably not 
cause much loss of power because as soon as the sun hit the array 
directly, it would warm up and drop in voltage.
I will work on the idea.
David
David Katz
President, AEE Solar
formerly Alternative Energy Engineering
1155 Redway Drive - Box 339
Redway, CA 95560 USA
(707) 825-1200
(707) 825-1202
email: david at aeesolar.com
web: www.aeesolar.com


Jeff Wongstrom wrote:

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>
>Hello Daryl,
>
>I just spoke with an Outback tech that was ADAMANT that I not design a
>system with an MX-60 and a 72Vnom array in Montana(low temps similar to
>Minnesota).  He said that with cold temps the MX60 would see greater than
>140Voc and that the MX60 could NOT handle this.
>
>Multiplying the Voc of a 72Vnom Sharp crystalline array by the NEC 1.25
>gives Voc of greater than 160Voc.   I am not as concerned with code as I am
>with having MX-60's fail prematurely.
>
>I was wondering if the MX-60 72Vnom arrays are crystalline and what kind of
>low temps they have experienced the past three years?
>
>
>Jeff Wongstrom
>NABCEP certified solar installer
>Thirsty Lake Solar
>406-889-5324 
>
>      
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