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Managing PV Power on Mars - MER RoversThe MER Rovers have recently completed over 5 years of operation! This is a remarkable demonstration of the capabilities of PV power on the Martian surface. The extended mission required the development of an efficient process to predict the power available to the rovers on a day-to-day basis. The performance of the MER solar arrays is quite unlike that of any other Space array and perhaps more akin to Terrestrial PV operation, although even severe by that comparison. The impact of unpredictable factors, such as atmospheric conditions and dust accumulation (and removal) on the panels limits the accurate prediction of array power to short time spans. Based on the above, it is clear that long term power predictions are not sufficiently accurate to allow for detailed long term planning. Instead, the power assessment is essentially a daily activity, effectively resetting the boundary points for the overall predictive power model. A typical analysis begins with the importing of the telemetry from each rover's previous day's power subsystem activities. This includes the array power generated, battery state-of-charge, rover power loads, and rover orientation, all as functions of time. The predicted performance for that day is compared to the actual performance to identify the extent of any differences. The model is then corrected for these changes. Details of JPL's MER power analysis procedure are presented, including the description of steps needed to provide the final prediction for the mission planners. A dust cleaning event of the solar array is also highlighted to illustrate the impact of Martian weather on solar array performance
Document ID
20150009129
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Stella, Paul M.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Chin, Keith
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Wood, Eric
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Herman, Jennifer
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Ewell, Richard
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
June 1, 2015
Publication Date
June 7, 2009
Subject Category
Spacecraft Design, Testing And Performance
Meeting Information
Meeting: 2009 IEEE Photovoltaic Specialists Conference
Location: Philadelphia, PA
Country: United States
Start Date: June 7, 2009
End Date: June 12, 2009
Sponsors: Institute of Electrical and Electronics Engineers
Distribution Limits
Public
Copyright
Other
Keywords
Mars dust
solar array
photovoltaic power

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