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What is the powerlogic PM820 meter life of the internal battery-backed clock.

The power meter uses its nonvolatile memory to retain all data and metering configuration values. Under the operating temperature range specified for the power meter, this nonvolatile memory has an expected life of up to 100 years. The data logs are stored on a memory chip, which has a life expectancy of up to 20 years under the operating temperature range specified for the power meter. Finally the life of the power meter's internal battery-backed clock is over 10 years at 25°C.
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