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

[Joe Felker]

Thta's a clever idea.  Is this a temperature-controlled switch?  I would 
be concerned about a device like this operating reliably for 20-30 
years.  This is especially critical if the downstream inverter/charge 
controller can be damaged by the higher voltage.  

Also, what about UL Listing?
Joe
Kelly Larson wrote:
> 
> Hi David,
> 
> Thank you for replying.
> 
> How much do you charge for this box?  I would need two, one for each 
> string, correct?
> 
> Happy day,
> Kelly
> 
> Kelly Larson
> BSEE
> Ca Electrical Contractor #868189
> 
> ~~~~~~~~~
> David Katz wrote:
> > 
> > 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



Joe Felker

Engineering Manager
NABCEP Certified Solar PV Installer
The Solar Center


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