The High Voltage Solar Array is an Industrial Craft 2 generator. It is a more efficient version of the Medium Voltage Solar Array, producing 512 EU/t instead of 64 EU/t in the same amount of space. This is the equivalent of 512 Solar Panels, 64 Low Voltage Solar Arrays, or eight Medium Voltage Solar Arrays. It is still bound by the same placing restrictions, working only in direct sunlight and generating far less EU in rain and thunderstorms.
HV Solar Hat Shapeless Recipe