two arrays [RE-wrenches]

[Darryl Thayer]

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> Jeff Wongstrom wrote:
Hello to all
More on the MX60 and my 72 volt arrays.  The advice I
was given (by Outback) was don't use 72 volt arrays if
the runs are short. (also that 48 volt battery on 72
volt arrays are much easier on the MX60 than 24 v
batt)  If the runs are long and you want to save wire,
or as in my case the system is installed, the new or
an old MX60 with the NEW software upgrade should work.
 They will up grade at the factory, it can not be done
in the field.  The way it works is the MX60 shuts down
if the PV exceeds the limiting voltage. (as the sun
warms the modules and the Voc comes down the MX
resumes operation.)  Even in my case this would not be
much of a annual loss of power, if any at all. 
Darryl 


> >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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