Out in the outback with OutBack [RE-wrenches]

[Marco Mangelsdorf]

Eric,

The Xantrex SW series inverters have been doing this for years--allowing for
both a line-tie (AC1) and generator input (AC2) with surplus power being
pushed back from the AC1 terminals.

Marco 
ProVision


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


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