The Low Voltage Solar Array is an Industrial Craft 2 generator. It is a more efficient version of the Solar Panel, producing 8 EU/t instead of 1 EU/t in the same amount of space. It is still bound by the same placing restrictions, working only in direct sunlight and generating far less EU in rain and thunderstorms.
The Low Voltage Solar Array is part of the crafting chain for the Medium Voltage Solar Array, which is in turn used to craft the High Voltage Solar Array. Low Voltage Solar Arrays can also be crafted with an Iron Helmet to create the LV Solar Hat, which acts as an upgraded version of the Solar Helmet.
The GUI of the Low Voltage Solar Array features only a single slot. Tools and batteries can be placed in it to recharge them.
LV Solar Hat Shapeless Recipe