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You can indeed use an emonTx to run the Mk2 (any variant) but if I understand you correctly, are you intending to keep the 'standard' reporting calculations as well?  Then you need one of the free-running or the interrupt versions. So long as one of your c.t's is measuring the nett power to/from the grid, you can use that for both measurement and control purposes, then put the other one on the inverter connection and you'll have a "Type 2" installation. You can easily add a header to the emonTx pcb to take off a digital output; though for all the i/o, you'll need to check and change the outputs in the Mk2 sketches to suit the different board layout of the emonTx compared to the Arduino. We're in the process of documenting that. I've lost track of exactly which Mk 2 sketch does what, I don't think any of the published Mk2 sketches incorporate measurement and reporting, but MartinR has published a design that does: http://openenergymonitor.org/emon/node/1535

I'm using MartinR's sketch which works impressively. I've sent you a PM with a web link to my emoncms site, so that you can see how it performs.

Paul

Paul - Would you mind sending me your web link too?

I am also using MartinR's sketch.  With additions by BrianD we can control both hard-wired diverter and remote radio controlled loads.  This is work in progress.  I haven't looked into the data logging side of things yet.....

Thanks

Robert, message sent.

Paul