MX60's and positive ground [RE-wrenches]

[Carl Emerson, Free Power Ltd.]

Hi there team,

Yes we have the issues sorted out now and the conclusion is the hub/mate
combination can be used safely with positive earth.

If anyone wants a copy of Chris's diagram let me know.

Thanks Daryl and Bob for your comments.

Carl Emerson
Free Power Ltd.
Auckland N.Z.



Subject: RE: MX60's and positive ground [RE-wrenches]


Carl, Darryl and All - 

I just sent Carl the diagram - his request was a little unusual in that 
he also wanted to have ground fault protection in the system - which can 
be done.  

One caution - the MX60 is not listed for positive ground applications 
and the method we use for positive ground applications is not completely 
NEC compliant - but it is safe and works.  

It does require a special wiring configuration and the use of two pole 
breakers or a GFP breaker.  If it is not installed per our instructions 
it is possible to damage the HUB due to currents in the communication 
cables.  

Christopher

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


Darryl Thayer wrote:
> 
> HI Carl and everyone, I was just a little to quick in
> my answer.  When you do positive ground, YOu Ground
> the battery, and the Array frame, and the MX60 frame. 
> BUT NOT Ground the positive from the modules only the
> Positive of the Battery (which is grounded at the
> Tele-com site)  Again do not ground the array
> positive, as this will by pass MX60 which does its
> boost operation on the positive circuit through the
> controller.  
> 
> good luck
> Darryl
> --- "Carl Emerson, Free Power Ltd."
> <freepower at freepower.co.nz> wrote:
> 
> > 
> > Hi there team,
> > 
> > We are doing a telecom system with pos earth -48Volt
> > DC.
> > 
> > We have 2 x MX60's on a thin film 2.2 kW array. I
> > need the diagram that
> > shows how to cable this correctly. I tried Chis D
> > and he has been too busy
> > to get back. Can someone help out here as we are
> > running out of time...
> > 
> > Thanks
> > 
> > Carl Emerson
> > Free Power Ltd.
> > Auckland N.Z.
> > 


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