Solar cell module, solar cell module string, solar cell system, and method for supervising said solar cell module or solar cell module string

A solar cell module or a solar cell module which is provided with a readable and writable memory medium capable of writing in a large quantity of information of said solar cell module and capable of reading out necessary information from said memory medium. A solar cell system comprising said solar cell module or said solar cell module string. A method for supervising said solar cell module or said solar cell module string.