There are 3 types of Solar Inverter, they are the Grand tie, Stand-alone and the backup inverter battery. There is a question of the capacity needed to power bulbs, Fans, TV, Refrigerators, Air conditioner, Home theater etc in bedroom flat, duplex or mansion without power outages. All that depends on generated power in KVA and its rate of usage.
The energy received by Solar panels and stored up as direct current by Batteries are converted to alternating current by Solar Inverters so that home appliances in our houses designed to use AC can be able to function well. That is why you need an inverter and a lot of them exist in every electrical and electronics market you visit in Nigeria.