Generator and Solar Panel

First thanks everyone for the information on this forum it has been very helpful to us new TM owners. Couple of questions. First we have a 70W solar panel and two 6 Volt batteries. Being out twice camping we seem to been not charging very much. We are going up about 50% from morning till evening from where we started even when using minimal lights and radio. We are thinking that we may have a ground somewhere. Any thoughts on if we are on the right trail and if so where to begin on checking.

If this does not work out we are thinking of getting a small generator to assist in this effort.

We have a 2005 2619 and love it so far except for this power issue. Any help would be greatly appreciated.

Tony