Well here is the schematic for the output stage of the W7 6kw unit I have.
All it needs is the 60hz pwm signal to drive the H bridge.
So, yes If you can get the Jakes output, rectify to dc, and then feed this H bridge with it, the Xantrex should be able to through put, or enhance depending on load. easy... not
To feed the bridge, we need to know what load is, so we can feed it the right pulse information. If we divide the positive going sine wave up into three sections (for example) then we can pulse the thirds with different width pulses, and let the transformer "shape it" for us, and we have our power. Normally this would be done is 30-50 steps, and so we can see how to make the wave, and how we can slip more steps into it to get more power out in a the same unit time.
Now if we have a vast reservoir (battery etc) it is easy to match the load, but if the input is slippery, and the output is vague, how can we do the algorithm for the next pulse.
Driving a grid is easy, the voltage won't sag as the grid carries it when the sun/wind dies out a bit, but driving a load needs a solid power plant behind it, to stop the voltage saging.
If the Xantrex can provide a flexible input, then there is a chance, but I have never seen a wild input device drive a wild output device with true sine wave behaviour.
Best bet is to rectify the jake (use transformer if necessary) and drive the batteries as in the days of old.... or buy an inverter that back feeds.
You will see in the schematic, that is is a property of the H bridge that it WILL do this. It does not even need the fets to pulse, it will feed through the body diodes if you look at the circuit... so it is Xantrex programming stopping you. ( the body diodes create a full wave bridge rectifier.. independent of what the fets are up to at the time)
I don't think an inverter from a genny will get you there. As it increases the steps/pulsewidth, it expects the driving power to increase as well, and if it doesn't keep up, then it all falls over as the output sags, the pulse width will increase, and we may saturate the output transformer.
A decent program may get you there, but I'm not up to it. An analogue D class amp may do it... but I have no hands on with those as yet.
..........I've been wrong plenty of times before too, this is a bit left field for me to fully guess the outcomes.
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I think I need a 10 kW inverter off a big inverter gen because they do exactly just what I want.
--"... the proper inverter is even better. sunny island etc...
..........................oztules