Array Voc > 140V for MX-60 [RE-wrenches]

[David Katz]

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Kelly,
If you were able to get under the ridge cap, we have the perfect product 
for you. Our first production run on our low temperature module bypass 
will be ready in a few days. This is a small box that mounts behind one 
module in a string and essentially takes that module out of the string 
when the temperature drops below 20F, lowering the string voltage by the 
open circuit voltage of one module. The box has 4 MC connectors on it so 
it can easily be wired across the last module in the string. This device 
is being manufactured for us by Apollo Solar. We originally designed it 
for grid tie systems where string sizing is tight, but it could easily 
be used to protect MX-60 and T-80 charge controls from over-voltage.
David

David Katz
AEE Solar, Inc.
formerly Alternative Energy Engineering
1155 Redway Drive - Box 339
Redway, CA  95560  USA
Phone 707-825-1200
Fax 707-825-1202
email david at aeesolar.com
www.aeesolar.com


Kelly Larson wrote:
> Fellow Wrenches,
>
> Has anyone figured out a kluge for the “Voc too high in the morning” 
> problem on the input from the array to the MX-60?  I have run into two 
> systems (not designed by me) where the MX-60 doesn’t connect until later 
> in the morning on cold days due to this.
>
> On one, the array is mounted on a 2 story home under the ridge cap, 
> which at this point is not accessible, (because of weather), so I can’t 
> just go around the last module in the strings.  I figure some 
> diode/relay/electronic thingy…
>
> So I am looking to drop about 10 - 15V, (from 150Voc to 140V, or better, 
> 135V), with 20A max current
>
> Thank you in advance for any ideas,
> Kelly
>
> Kelly Larson
> BSEE, Ca C-10 #868189, Energy Educator
>
>
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