Title: Energy Storage Summary Questions

Source: https://www.tesla.com/it_CH/blog/introducing-megapack-utility-scale-energy-storage

Q: Energy storage is a multi-purpose technology. This is advantageous as multiple applications can be combined, and the technology can be developed through the various different applications. Select all applications for which energy storage usage is valid.
- Frequency regulation of the grid. (correct)
- Storage of excess energy produced during low-consumption hours. (correct)
- Mobility Applications (i.e. electric vehicles, hybrid vehicles) (correct)
- Consumer Electronics (correct)

Intermittent Renewable and Storage

Fill in the missing words in the text.

Q: Energy storage is particularily interesting for renewable energy generation from intermittent sources such as [...] (only available during daytime) and [...] energy.

These intermittent sources only produce energy at certain times and this is therefore challenging as the timescale of the production may not meet that of [...].

In particular, with falling costs for renewables these technologies are growing rapidly, competing with traditional [...]-fuel based technologies that currently dominate the market.
A: solar; wind; consumption; fossil

SOURCE: IRENA - https://infogram.com/costs2019_infographic-1hmr6g0ly5m94nl

Drag & Drop: Drag each energy storage technology under the appropriate form of energy it is storing

- [Image: Flywheel]
- [Image: Batteries]
- [Image: Supercapacitor]
- [Image: Hot Water Tank]
- [Image: Fuel Cell]
Q: Mechanical
A: [Image: Flywheel]
Q: Electrochemical
A: [Image: Batteries]
Q: Chemical
A: [Image: Fuel Cell]
Q: Thermal
A: [Image: Hot Water Tank]
Q: Electrical
A: [Image: Supercapacitor]

Types of Energy Storage

Recall that energy storage can be classified based on which form of energy is being stored.

Fill in the missing words.

Q: There are 2 key parameters that are commonly used to classify energy storage techologies.

First,  [...] is a measure of how much energy can be stored by the given technology.

Secondly, the [...] is a measure of how fast the technology can discharge energy.

Varying applications may have different requirements in terms of these two parameters.

The [...] is then the ratio between the [...] and [...] of the technology. Often, this metric is used interchangeably with power rating as it serves as a direct indicator on the time-length scale at which the technology operates (i.e. does it discharge over seconds, minutes, hours, or days?).
A: energy capacity; power rating; discharge time; energy capacity; power rating

Discharge Time - Single Choice Set

Q: You buy a new smartphone and are curious about how long inbetween charges, the phone-life will last. On the specification sheet, you find the nominal energy capacity given as 3.5Ah, and a nominal voltage of 3.7V (i.e. nom. energy capacity = 12.95Wh).

The nominal power rating is then given as 5W. What is the discharge time for this storage technology?
- 2.59 hours (correct)
- 7.95 hours
- 0.39 hours
- 64.75 hours

Q: Based on the discharge time vs. capacity plots for different technologies, which storage technology is most appropriate for this application?
- Batteries (correct)
- Supercapacitors
- Superconducting magnetic storage