Out in the outback with OutBack [RE-wrenches]

[Matt Tritt]

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Eric,

This is what makes the Sunny Island so attractive, but expensive! If 
you're not familiar with them, give SMA a call and request some product 
lit., or check them out on the web.

Matt T

Eric Youngren wrote:

>I have a theory.  I tried to address it in an earlier post about GT w/ BB
>systems but nobody bit.   Here again I'll throw it out there for those who
>understand these things better.
>
>I think the problem is an inherent difference in inverter technologies and
>function.
>
>In my SEI PV2 class in Carbondale a few years back, John Berdner taught
>inverters, and he broke it down like this:
>
>There are two basic types of inverters,  voltage source and current source.
>
>Voltage source are battery based, and produce their own voltage, waveform
>frequency and current flow.
>
>Current source inverters are grid-tied, and generate current flow only.
>They need an AC voltage, waveform and frequency to which they can
>synchronize and "push back" current against.   
>
>I may be oversimplifying this, but is the inherent problem with high
>efficiency grid tie and battery backup simply that these are two very
>different tasks to ask of a single inverter?  Maybe the answer is a "hybrid"
>dual-purpose inverter system utilizing both technologies in a single box?
>
>Eric
>
>
>
>
>The grid tied version of the FX is very fussy about what it will kind of 
>AC input power quality it will accept. Yes, you could possibly set up a 
>manual transfer switch on the bidirectional inverter AC input with an AC 
>inverter generator. You could use an external transfer switch, but the 
>customer would still have to go to the mate and tell the FX the input is 
>now "gen" rather than "grid". This is mighty complicated for your 
>average customer to manage, plus I have not seen large wattage inverter 
>generators. The SW used to do that all automatically... so rather than 
>just have the inverter automatically start the genny and go, you have to 
>change the transfer switch position, change the input configuration in 
>the mate and then start the genny.... and when the grid comes back up 
>you need to reverse everything back.
>
>That is why the other "work around kludge" for what most see as an 
>obvious design fault in the FX is to use a 2:1 step down transformer on 
>the genny output (_any_ genny will work for this), rectify to DC and 
>dump that as another input to the MX60. Yes, this is clunky and home 
>brew (which I try to avoid now days) but workable, and presents nothing 
>to do on the customers part but start the generator (or let the mate do 
>it) when the grid is down and the batteries are low.
>
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