None are showing wear, to the best of our knowledge. Because they are too complicated. Brushless motors are used in centrifugal solar pumps that use high-speed motors. They use complex electronics that can fail by surprise. Our pumps use a slower speed motor, so brush wear is slow, and predictable.
Brushes are inexpensive and easy to replace in the field.
We have used only simple brush-type motors in the thousands of solar pumps that we have produced since 1983. The brushes routinely last 5 to 10 years, and the motors far longer. Tracking the sun is optional. The SunRise system performs well in low light conditions, so it will work through most of the day without a tracker. Use our performance charts to determine daily yield.