Right, I've started *another* project (I have too many going):
https://sourceforge.net/projects/dhddd/The aim is to build prototypes that will make individual houses/appliances more grid-friendly by reducing instantaneous power demand when (a) grid frequency drops and/or (b) the house is not exporting from local grid-tied microgeneration.
This should basically help make the house import less from the grid especially when the grid is stressed.
But this could also help with big off-grid systems by avoiding them tripping if too much load goes on at once and/or the microgen drops, eg the sun briefly goes behind a cloud.
In particular I want first to try with an ordinary electric (tea)kettle, then may also try with my dishwasher.
I may build it with PICAXE or AVR/Arduino for the microcontroller element, and it'll have a radio module, transformer for power (and crude voltage/phase sensing with current clamp at consumer unit), and meaty zero-crossing SSR for appliance control.
Nothing to see yet, but a great chunk of the design will be cut-n-paste from elsewhere!
Rgds
Damon