I recently had a 3KW Grid connect solar system installed which produces on avaerage 10KW/H per day. We typically only use about half of that. The house did have instatant gas hotwater but we have found the majority of our gas bill is the connection fee. So the plan is to build an energy meter that connects to the network and a power control on a new electric hotwater heater to only heat water when there is surplus power.
Power requirement > 2400W continuous
Variable output dependant on available