While I only head out for a week at a time, I chose not to tilt the panels and use fixed mounts. 4 panels = 428 watts into two trojan t-125's. Ive found that when extreme ie, 3 college kids laptops, phones tv, water pumps etc, the batts fully charged up in the late afternoon. I might add two more panels.While tilting or trackers are the most efficient, my choice was to have it be autonomously and not have a another thing to add to my list when camping. However I have seen others add a portable panel, one or two and leave them on the ground tilted.