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Energy Storage

Analogous to the Solar Cell/Panel/Array structure, Sedaro allows for the modeling of one Battery System which is composed of Battery Packs, themselves composed of Battery Cells.

Battery Cells​

Battery cells are used to assemble the battery packs that will power the satellite. Cells in this table can be swapped in and out to test different cell technologies within your mission architecture. Similar to a Solar Cell, a Battery Cell can be reused many times in one or more battery packs.

To create a Battery Cell, click the "+" button at the bottom of the table and specify the following properties.

  • Capacity - how much charge the cell can store in A-h.
  • Equivalent Series Resistance - a measure of the battery cell's internal resistance. This characterizes the energy dissipated by the battery as it is charged or discharged, which limits the amount of peak current it can deliver.
  • Maximum Charge Current - maximum current at which the battery can be charged.
  • Maximum Discharge Current - maximum current at which the battery can be discharged.
  • Minimum State of Charge - The minimum state of charge is specified as a percentage of the battery cell's total capacity. It is chosen to prevent the battery cell from fully discharging and to extend its lifetime.

Finally, define the discharge curve of the cell, given by the change in open circuit voltage as a function of state-of-charge. You may use any number of points to define this curve.

Battery Packs​

Battery packs are used to assemble the battery that will power the satellite. The packs in this table compose the battery (or "Energy Storage System"), as configured by the parameters in the Battery System. Each pack exists as a discrete Component within the system. To create a Battery Pack, click the "+" button at the bottom of the table and specify the Battery Cell that the pack is built from. Choose the number of cells to use in series and parallel.

Battery System​

The battery provides power to the satellite when the solar arrays are not able to generate the power consumed by all the active loads. The battery is composed of one or more packs, each of which are treated as an individual heat source, as they are often located in different parts of the satellite.

When designing the Battery System, the user chooses the pack configuration and initial state of charge and may optionally override the minimum state of charge and charge and discharge currents implied by the configuration and Battery Cell definition.