I have 2 solar panels, 100w and 125w. They will separately power one 100ah battery each. Can I parallel connect the 2 batteries for charging purposes or should the batteries separately go to the same 30amp charge controller to then charge my stuff? This is a 12v system. Thanks for any help.
I would connect the two batteries in parallel to the controller and the two panels in parallel to the controller.
Separating each panel / battery would need a second controller - then you may consider a method of supplying the loads from either battery with a changeover for backup.