Follow-up Report: Penikese Island School Page: 4 of 6
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Penikese Island . Lool
Mr. Akens will measure the energy consumption of the refrigerator freezer
during January using the watt hour meter installed in the charge controller.
It is understood that once the system is properly sized, and the freezer is
operating properly, the staff will use the freezer to make ice for soft drinks.
Thus, measurements will ba made while the refrigerator is making a few
trays of ice a week.
It is also understood that the refrigerator will not start unless the voltage at
the compressor is at least 11 volts. Starting current is approximately double
the operating current of 5 amps per compressor. The resulting voltage drop
requires that the battery operate at somewhat over 11 volts in order to start
the compressors. This battery state of charge required to produce 11 volts at
the compressor is probably well above the design discharge level of 80%
discharge. In other words, the refrigerator will fail to start well before the
battery reaches a state of charge deleterious to the battery, and the design
storage of 5 days to an 80% depth of discharge is closer to three days storage to
50% depth of discharge.
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Berg, B. Follow-up Report: Penikese Island School, report, December 1, 1992; United States. (digital.library.unt.edu/ark:/67531/metadc666469/m1/4/: accessed January 16, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.