with voltage or power driven controller:
http://solarinvert.de/produkte/wechselrichter-tl/batteriewechselrichter-188/batteryinvert-2000-48.html

Since mid 2016 micro photo voltaic systems are allowed in Austria to be plugged into a wall outlet with a max. system power of 600W.

This could be a proper inverter:
Envertech-EVT500

Connected to 2 solar panels with 250W each, this could last for many years and reduce the bill of electricity.

Depending on how much energy can be consumed of the normal devices in your house, the break even point could be within 10 years.