Two axis tracking solar collectors that rotate around an axis parallel to the earth's axis have no convenient place to mount a controller that requires a user interface. When they stow upside down at night or during stormy weather a controller mounted on the front is hidden underneath. If mounted on the back, it's underneath during midday. Using a cable to mount a controller to something stationary invites lightning surge damage (the metal structure is a Faraday cage that protects electronics inside). Flutter looks like it will be able to operate a solar collector and communicate with a remote second Flutter unit to enable users from a distance to record data and manually control the two motors during maintenance.
A third Flutter unit could even live in the basement and tell the primary controller that no more heat is needed because both the domestic water tank and the space heat/air conditioning storage tank are at their high temperature limit.