The original solar container component is

The core component of the solar power box is the photovoltaic panel, which is composed of many solar cells, and these solar cells are usually made of silicon or other semiconductor materials. [pdf]

Lunar solar container

Major projects now deploy clusters of 20+ containers creating storage farms with 100+MWh capacity at costs below $280/kWh. Technological advancements are dramatically improving solar storage container performance while reducing costs. [pdf]