Winter
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Checking on a stored camper without driving there
Off season, the rig sits somewhere you are not. The two questions worth answering remotely are whether it is getting too cold and whether something is still running.
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Freeze protection for an RV you are not standing in
A burst line is a five figure repair that announces itself hours after the temperature crossed the line. Monitoring does not stop the freeze. It buys you the hours.
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The coin cell problem
A sensor that has run out of battery does not tell you it has run out of battery. Why coin cells fail in the cold, why lithium matters, and why last-seen is a reading in its own right.