The origin of optical discs for solar power generation

An optical disc is a flat, usually disc-shaped object that stores information in the form of physical variations on its surface that can be read with the aid of a beam of light. Optical discs can be reflective, where the light source and detector are on the same side of the disc, or transmissive, where light shines through the disc to be detected on the other side. [pdf]
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What is the voltage of photovoltaic series inverter

A solar inverter or photovoltaic (PV) inverter is a type of which converts the variable (DC) output of a into a (AC) that can be fed into a commercial electrical or used by a local, electrical network. It is a critical (BOS)–component in a , allowing the use of ordinar. Input voltage (Vcc): this value must be equal to that of the battery (12, 24, 48 V). Output voltage (Vac): this value must be normalized (230 Vac). [pdf]