DAY 6 PlotWatcher Pro Manual page 26

If you wish to use a solar panel accessory, be sure it is a 12v model. It is a good
idea to select one that has an integrated battery or a battery charging circuit
connected to an external battery which is connected to the PlotWatcher Pro.
If your solar panel is not used in conjunction with an integrated or external
battery, it can still prolong the life of your camera by providing the operating
power during sunlight hours. The internal batteries will be automatically
selected to power the camera when the output of the solar panel is not
present.
Note that the Battery % indicator will show 100% as long as the external
battery power is above 10v. It will not be an accurate indicator of the life
remaining in the external power supply.
www.Day6Outdoors.com Page 26