Solar panels with build in battery capability

Not the master Garth here but my input would be it really depends a lot on your climate and where you plan to place the node.

To get through a dark week or so in the cold winter, a large batter may be required even when the same setup would be more than sufficient in the summer. If it gets really cold, you may also need to add some heating for both your battery and even board to keep the crystal at proper temperature. These all mean bigger battery and larger panels and unfortunately there isn’t one catch all solution or prediction without some real world data for where you expect your deployment.

Some further discussion: