In 2014 I did some tests with low voltage batteries for the TFA Primus station (similar to the TFA Opus except for battry powered rain module). i discoveredd the bits which indicate 'low battery' per sensor (rain, wind etc.). Can't say which is first: bad value readings or the battery low indication. See thread: https://groups.google.com/forum/m/#!search/Rain$20battery$20status/weewx-user/LGpAJojtxA4 Cheers, Luc
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