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The thermal requirements are based on a detailed description of the martian environment as a function of latitude and season. Parameters such as sky temperature and effective conductance to the martian soil are subject to further investigation.
Some criteria which are fundamental to consider include
the charging of the battery during which a temperature range
of 1 to 40°C is planned. During discharge the range expands
to -20 to 60°C and whilst not operating to -40 to 70°C. The
insulated warm compartment needs to be maintained above -40°C
whilst the equipment external to the insulation has to tolerate
directly the martian environment.
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