There isn't much of non arable areas every where. We need to figure out a way to grow crops under the solar panels. With current Solar panels we can grow tomatoes easily. Anyway Solar panels have to be cleaned with water so that dust doesn't block the panels. That same water can feed the crops. There is a new emerging space called agrivoltaics.
Solar panels are installed on a elevated level which allows for crops to be grown underneath without loss of land.