I thought motor was powerfull enough but unfortunatelly not.

Tests was done on smooth floor and on real tiles which was significantly worth.

When scrashing a little bit a surface, friction is much higher than the motor can reach.

Design is good but mecanic is not.

Second version of this roof cleaner will contain two brushless motor and Herringbone gears.

More improvement will also be no remote wiring and "power back pack". Battery will be hosted directly inside the brush.