The ideal solution for this case is the GridFree installation with solar panels, Micro-Inverters and current relay. The Government can put tax on commercial installations, but it cannot put tax or fee on self-consumption. The GridFree does not need any permit or license from the Government:
Please see attached GridFree-schema.
More information about GridFreehttp://gwl-power.tumblr.com/tagged/GridFree
You will need following products for example for 1,4 kW system.
The installation is very easy. Each Micro-Inverter is directly installed and connected to the each solar panel. Cables between Micro-Inverters are included and simply connected together.Current relay switch off the Micro-Inverters when the consumption of the house is lower then power from Micro-Inverters.
Please see attached Connection-schema.
System is divided by 3 Micro-Inverters with 2 current relays so the switching of should be solved in two steps:
1) Consumption of the house lower then 1380 W
2) Consumption of the house lower then 690 W
Please see other Information:
http://www.ev-power.eu/Micro-Inverters/
http://www.ev-power.eu/GridFree-Inverters/
The support pages related to the MicroInverters:
http://gwl-power.tumblr.com/tagged/MicroInv
http://gwl-power.tumblr.com/tagged/MCInfo
http://gwl-power.tumblr.com/tagged/MCFaq