A solar power inverter converts solar energy into electric energy that you can utilize in your home. In the integration process, you need to connect each solar panel in series, but the problem is that you get DC power from the panels, while you require AC at home (don't you?).
A solar power converter helps in getting this job done, and the size of the converter/inverter that you will require will primarily depend upon the peak load of power consumed in your home; you can find it out by adding up the wattage of all the main appliances that you use, such as the AC, refrigerator, TV, microwave, washing machine, dishwasher etc.
Integration of a solar system that still uses grid power doesn't necessary require an external battery for storing the charge, and an inverter should serve the purpose.
Therefore, a power inverter needs to be connected to convert DC to AC power. We're currently not considering the battery part, and assuming that you're using the grid supply alongside the solar power system.
A real-time microcontroller sits in the middle of the inverter that controls very precise algorithms required for inverting DC voltage into AC.
I recommend using Texas Instruments's C2000 inverter, whose block diagram is shown above.