QUESTION:
How much voltage do the solar cell put out on the Hubble ? 

ANSWER from Rick Fredo on 27th, April 1996:
There are 48,760 solar cells mounted on the HST solar array blankets. =
Each cell, operates at between 0.3 to 0.35 volts. The cells are connected =
in groups with 106 cells in series. So, if you measured the voltage at =
the point where the solar array connects to the HST, the actual voltage =
is approximately 34 volts. At the beginning of its life, the HST solar =
array generated 5100 watts and approximately 150 Amps of current. After =
spending some time in orbit, particle (protons and electrons) radiation =
from the Sun causes the solar cells to degrade. After 4 years in orbit, =
the solar array will generate less than 4400 watts of power.