don't see why it would eat much power. Just google 'solar tracker add DIY to that and you will fnd dozens of ways to do it. Simplest is 2 photo cells with a diffuse image of the sun shining them feeding a comparator. When image is centered between the cells the comp is in balance and motors are off. If the image favors 1 cell or the other the motor is powered on to move the right way to center the image. All in all depending what you set the in-balance window to, very little power is expended. The at-dusk/nighttime rewind to morning position is just as easy.

Considering you're not running a motor continuously, just doing adjustments, it should not take much energy to do the couple of adjustment during the day. Worse case scenario, you could always do it with a crank, but i can't really imagine saving the power and doing it manually is really worth the effort.

The array style I went with can be converted to a tracking system. As it is currently installed, it can be adjusted seasonally to maximize the yield. I have 4 preset tilt angles built into the array, 10degrees, 20degrees, 30degrees and 40degrees. The issue with solar tracking systems is the extra expense. Trackers cost more per watt than solar panels do. If you're tight for space then spending the extra money on trackers could be appropriate. But at the present time, you get more yield for less expense by buying more solar panels if you have the space for them. If the cost of tracker to solar panels changes in the future I'll consider it again.
My analysis is based on a large number of factors, that are not the same for every project. So just because there is no way to justify the cost of a solar tracker on this project, does not mean that projects do not exist which trackers would be appropriate for.

that looks really good sofar guys cant wait to see a finished version

Enjoying the progress...  Drool.....
Too bad the weather doesn't permit this every where in the U.S. to make it worth it.
What is worth it.... The inevitable move!

Look forward for more.

really gonna spend time in this thread. we are going solar soonish (well we hope anyway), all ground mount, and have room for a lot of panels.