Inverter Monitoring & Canceling Meter Legs [RE-wrenches]

[Christopher Freitas --- OutBack Power]

Kirk Herander, VSE wrote:
> OK - but don't we want the meter to only register Solar-generated AC? 

Yes Kirk - that is the correct hook-up I believe - although I should 
pull out my notes to be sure (and I will later today as I am writing up 
a "tech note" to put on the OutBack website).  

The funny part is that with the terminals on the back isolated (jumper 
bar removed) and the terminal connected to neutral - the meter measured 
exactly 1/2 of the power produced. So I guess the meter needs 240 vac to 
work properly - even when used on a single phase of AC power setup as 
described.  

So I ran the jumper over to the other meter box and tapped the opposite 
hot phase to get the 240 VAC for each of the meters.  With this they 
worked correctly.  So this is a good solution for systems with 120/240 
vac power - which is fine even with single inverter applications as the 
grid can provide the 240vac (except during an outage).  Another option 
would be to use a small transformer for making the 120 vac into 240 vac 
just for the meter.   

This method of using a single meter will spin backwards when battery 
charging - so it does account for the losses involved at night (as with 
a SW system - the OutBack FX draws zero watts at night).  It also 
records the power provided during an outage as sold power - as it 
should.  

Now all we need is sunny weather to actually produce some power...    

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

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