Electrical Systems

Hubble's Solar Panels are its primary source of power. Each array of solar cells converts solar energy into electrical energy. The electricity produced by the solar cells is used to charge Hubble's batteries.

Hubble has six batteries each consisting of 22 cells in series (and including other components such as additional heaters and electronics). The batteries are packaged in two groups of three in modules weighing about 214 kg each. Each battery holds more than 75 Ampere-hours of energy. This is sufficient to keep the telescope in normal operation for 7.5 hours.