Seeking the sun

We recently had some solar panels installed ... hopefully not too visible from the street. The initial plan included a battery to store excess power, but we were advised by the supplier to monitor how much power we were able to generate over a year before making that additional investment. The issue is, or course, trees, and the lovely shade they provide which is generally desirable, but not for solar power generation.  We have 2 arrays, on different parts of the roof, and they manage to take turns being able to generate power as the sun moves across the sky.