Positive ground with batteries? [RE-wrenches]

[Christopher Freitas --- OutBack Power]

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Phil - 

The OutBack HUB does actually work with positive ground systems - but 
there are ways that it can be easily damaged if it is not connected 
properly - which is likely to happen.  Steve was being a bit dramatic 
perhaps... 

Yes - the negative (ungrounded) conductor could be a color other than 
red - I was making a point that the color codes become a little 
confusing from what is normally done - which is why it becomes easy to  
make wiring mistakes with making a positive ground system NEC compliant. 
 

The other point I want to emphasis is that a positive grounded system 
using an OutBack MX60 would still not be NEC compliant since the MX60 
would be switching the grounded conductor - regardless of how well it 
was wired and installed. 

Because of these issues we do not advise using OutBack products in 
positive ground applications.  It can and has been done successfully - 
but I think the risk outweighs the benefits.  A "micro-grid" approach 
using OutBack inverters for the battery and a batteryless grid-tie 
inverter for the PV would be more adviseable when these positive ground 
PV modules must be used.  

Christopher  


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

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