Grid Alternatives receives equipment donations from solar panel and inverter manufacturers such as SunPower and Enphase. They have a portable loud-speaker system, and there is an inverter, as you call it, at the transmitter. We can use automobile batteries, and the inverter will give us 110 AC for a while, until the batteries run down.
The ancient Greeks have made many influential contributions to western civilization. These contributions, which are also the achievements of ancient Greece, include certain things in the areas of philosophy, art and architecture, and math and science.
In 387 B.C. he founded the Academy, which was a  school of philosophy and science in Athens. One of his pupils at  the Academy was Aristotle, who became famous as a philosopher. He  created 36 literary works, 35 dialogues, and a group of letters.  His works were mainly concerned with philosophy and ethics but he  taught Aristotle at his Academy, who in turn contributed to  astronomy and science.