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

[Kelly Larson]

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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