Finding vertical & finding north is not a problem, you can get that trivially in a tiny MEMS IMU if you don't want to do it manually, and from there determine t

Finding vertical & finding north is not a problem, you can get that trivially in a tiny MEMS IMU if you don't want to do it manually, and from there determine the optimal path for solar tracking without added variables, supposing you have the timezone set by the distributor (or use a GPS for that at a few dollars a chip). The cost is in the rotating frame and the motors.