Positive ground with batteries? [RE-wrenches]

[Christopher Freitas --- OutBack Power]

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The SunPower modules do not have a physical connnection of the positive 
to ground - they have an issue caused by their unusual all back 
connected construction.  The simplist way to explain the problem is 
that, when the panels are connected in a negative ground system, some of 
the electrons end up sticking to the glass and the PV module ends up 
with reduced output.  Grounding the PV array positively ends up 
reversing the problem and getting full output again.   

I have heard that this issue is not significant at the 12 and 24vdc 
levels.  I have personally measured and seen the output increase once 
the system was switched to positive ground on a 72vdc PV array with a 
MX60 and a 48vdc battery.    

There is a full technical "white paper" on the SunPower website if you 
want to learn more.  

Christopher
 

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

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