SumnerBoy: I have always considered this a risk of installing solar. There is no guarantee our buyback rates will remain the same, and there is every likelihood they will decrease as more solar getting installed. That is why devices like the MK2 PV Router are so clever, and necessary, in my (and many others) opinions. Robin has just started a discussion on the Open Energy Monitor forums about enhancing the logic of the PV router so that you can dump energy to non-resistive loads - i.e. something like a dishwasher or washing machine. This is where things start to get more complicated but the tools are in place now so hopefully these clever chaps can come up with something even more useful.
wouldn't it be cleverer to just set it up to initialise the dishwasher/washing machine directly and just keep topping the battery load used by doing so? I.E i set p the dishwash/washing machine(s) before heading out and once the output reaches a certain point (or the batteries are topped up) the non inductive load is initialised and uses the 'excess' power created?
Think 'connected home' and add 'smarts' :D