1 Solar panel--2 Seperate batteries

I have a 100 watt solar panel. I want to use this 1 panel to charge 2 separate batteries in different locations.

Have you done a power budget? Are you charging or just maintaining these 2 batteries?
Do you need more than 100W?? If so then add a second panel and controller.
If 100W is enough then just get a Morningstar SunSaver Duo and call it a day.
-Mark