Off grid Islanding [RE-wrenches]

Christopher Freitas --- OutBack Power cfreitas at outbackpower.com
Mon Apr 18 18:40:05 PDT 2005


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Hugh wrote:
> I am intrigued by the differences between bidirectional inverters.
> know they are entirely different from the old mod-sine inverters 

Yes - the FX, SW and Sunny Island (SI?) are basically the same layout 
and are all very different from the old mod-sine wave inverters.  In all 
three of these battery charging is accomplished by "software" and not by 
actually reconfiguring the guts of the inverter into a charger circuit.  
The AC input and AC output are really the same thing - the AC input 
terminals is just connected to the AC output terminals once the inverter 
has sync'd up to the AC source (grid or generator) by the internal AC 
transfer switch system. 

Technically, all three of these inverter designs are capable of "mixing" 
power (charging, selling, supporting) but with the higher frequency 
switching speed of the FX and SI units the control of the AC currents 
flow needs to be done much more carefully as with higher speed switching 
things can go wrong much faster... 

It does seem odd that the FX can actually battery charge while in the 
inverter mode without any "AC source" connected to the AC input 
terminals - but it does and there are some out there using this 
capability with not just Sunny Boy inverters but also with other 
batteryless grid-tie inverters as well as AC sources such as micro-hydro 
systems.  

Welcome to the future... hang on...

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

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