Solar
Array Testing
Thirty-two 5" by 5"
high efficiency monolithic silicon solar cells are mounted and wired into the
solar plane's ten-foot wing. The cells in each half of the wing are wired in
series. Each half of the wing produces about 8 volts at 4.8 Amps when loaded to
produce the maximum output power. The outputs from the two wing-halves are
paralleled, producing a total output of about 8V at 9.5A in bright, normal
sunshine under the cooling conditions of normal flight. This gives the plane
about 76 Watts (max) of solar-generated electrical power to run the plane's
motor, radio control receiver, servos, and the onboard instrumentation, data
logger and telemetry transmitter.
The solar cells were purchased
from overseas sellers through an online auction. They are exceedingly fragile.
Mounting and wiring them into the wing was a significant effort. Because of
this I serialized and electrically tested all of the cells used in the plane
before installing them. This ensured that all cells used in the plane would
perform as expected.
Following installation into
each half of the wing, each 16-cell array was tested prior to covering the wing
with clear shrink film. Final electrical and thermal tests were performed on
the finished, covered wing. These photos depict some of the testing.
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