3 Sharp 200W in series to MX60 [RE-wrenches]

[William Miller]

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John:

An employee at Fronus did a study of differing orientation arrays.   IV 
curves stay the same shape at differing light angles, they just become 
smaller.  Therefore, the MPP of arrays at different orientations is 
similar.  Their MPP unit tracks the stronger array, but that charge point 
will also work pretty darn well with the weaker array.  The bottom 
line:  1% loss due to differing orientations (plus the loss inherent in any 
non-optimal orientation).  This study is probably on the Fronius web site, 
but if you can't find it I'll scan it and e-mail it to you.

I'd like to see all manufacturers run tests on their particular MPP units 
to see if they all act equally well in this situation.

I say go for it!

William Miller



>Dave,
>
>      It sounds like you have the right numbers.   We have had good luck with
>the upgraded MX 60's, but I should say the maybe the  jury is still out as we
>are still waiting for the cold temps this winter to see  for sure if they 
>hold
>up well.  When the upgrade was done last spring, wer  were easing out of the
>cold temps.
>
>We are working on a similar design with 3 MX 60s.  Our problem is  working on
>2 roofs with different pitches and one MX 60 will have some panels on  each
>slope.  To add to Dave's question, does anyone else have a comment  about
>performance on two slopes.  I'm guessing that there won't be much of  a 
>problem but
>will the MX 60 do more sweeping to find the MPP?
>
>John  Blittersdorf
>NABCEP Certified Solar PV Installer
>Central Vermont Solar  & Wind, Inc.
>104 River Street
>Rutland, VT  05701
>
>802-747-0577
>802-773-0924 fax
>802-770-8625 cell
>_www.cvsolar.com_ (http://www.cvsolar.com/)
>
>
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