# Engineering Analysis: Power and Batteries - PowerPoint PPT Presentation

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Engineering Analysis: Power and Batteries. Spring 2014. Innovative System Project for the Increased Recruitment of Emerging STEM Students. Info You Need. Instrument Requirements Table:. The Power that an instrument requires tells us “how much” power an instrument consumes.

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Engineering Analysis: Power and Batteries

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## Engineering Analysis: Power and Batteries

Spring 2014

Innovative System Project for the Increased Recruitment of Emerging STEM Students

### Info You Need

Instrument Requirements Table:

The Power that an instrument requires tells us “how much” power an instrument consumes.

Lifetime, Frequency, and Duration tell us “how long” the instrument consumes the Power.

Batteries are measured in units of “Watt Hours” (W-hr), which requires that we know “how much” power is consumed and for “how long” it is consumed.

### Operational Time

Operational Time is basically the total time that a single instrument (or support device) is “on” and consuming power. (Add up all the “durations” over the lifetime of the instrument.)

### Total Power Required

For each instrument and power-consuming support equipment, multiply the power required (in Watts) by the operational time (in hours). The result is the “total power required” for each instrument, in Watt-hours. Then, add all those Watt-hours to get the “grand total” power required by the entire payload.

### Battery Mass Multiplier

• The specific mass of a space battery is 400 W-hr/kg

• To determine the total mass of batteries that you require for your payload, simply divide your total power required (in W-hr) by 400 W-hr/kg, and the result will be in kg