MX60 question [RE-wrenches]

[Christopher Freitas --- OutBack Power]

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Allan Sindelar wrote:
> Wait a minute, here...

The issue on your system was not related to having a high voltage PV 
array operating close to the MX60 mppt controller (which doesn't know 
how close the PV array is...) but I beleive it was an issue of the cold 
temperatures causing the voltage to get too high under some conditions 
at your altitude and location.

We have made a number of improvements to the MX60 to both handle higher 
input voltages (currently 140VDC is the advised max) but also to self 
protect itself to a degree under conditions which exceed 140 vdc.  The 
two units you originally had did not have these improvements.  

Bob gave you the correct solution - rewiring your array to a three in 
series was probably the best solution for your situation - It allows the 
controller to operate a little bit more efficient and still reduces 
wiring losses substantially.  You also probably don't have any issues 
with partial shading on this system - so that's not an area to make any 
improvement in.  

Thanks for the question - All of us here at OutBack appreciate the 
feedback and "testing" our products get by the wrench community.  
   

Christopher Freitas
OutBack Power Systems, Inc.
cfreitas @ outbackpower.com  
www.outbackpower.com
Arlington WA USA
Tel 360 435 6030  

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