i had and idea that would be interesting to test.. and that is to get 4 small cheap UPS batteries for about R100 each and connect them to my inverter. Set the unit to 80% DOD.. just to sort of con the inverter to startup and then have enought solar panels to keep from using batteries that much... but as the batteries are cheap why worry if you kill them..
so is a idea, and would basially be the same as a grid tie system..