Not getting readings from our Sky

We have not gotten any readings from our Sky since December 12th. It has a solar panel on it and we are wondering if we have not had enough sun to drive it although the last two days have been pretty clear.
Two questions:

  1. We live in Washington state and we are down to our shortest days of the year. Is there not enough sun this time of year to power the Sky unit?
  2. Can we keep batteries in the unit to act as a backup to the solar panel?

2 posts were merged into an existing topic: Not getting readings for our Air