I have an Inverter! What does it mean in Nigeria?

A few months ago, I heard off and saw a new device in Nigeria called an Inverter. I was visiting a friend of mine who lived in Gbagada phase 2 and as I was leaving I noticed a battery box and an electronic device in her foyer. I asked her what it was and she told me that it was an Inverter. She bought one to minimize using her generator. The system is plugged into the grid and recharges the battery when there is electricity and then when “NEPA takes light” the inverter takes over.

The definition of an Inverter as per Wikipedia. “