ESCO Energy Storage Systems 3

Question 1

What is the primary financial benefit of pairing battery energy storage with solar PV in a commercial ESCO project?

Accepted Answer

Reducing demand charges by storing solar energy and dispatching it during peak demand intervals

Answer

Eliminating all utility interconnection fees permanently

Answer

Doubling the federal Investment Tax Credit available for the project

Answer

Eliminating the need for a utility interconnection agreement

Question 2

Which NFPA standard specifically governs the installation and safety requirements for stationary energy storage systems in the US?

Accepted Answer

NFPA 855 (Standard for the Installation of Stationary Energy Storage Systems)

Answer

NFPA 70 (National Electrical Code)

Answer

NFPA 101 (Life Safety Code)

Answer

NFPA 13 (Standard for the Installation of Sprinkler Systems)

Question 3

In energy storage, 'frequency regulation' refers to:

Accepted Answer

Rapidly charging and discharging a battery to help stabilize grid frequency near 60 Hz

Answer

Scheduling battery charges on a fixed daily timetable

Answer

Regulating the frequency of battery inspection and maintenance intervals

Answer

Controlling the switching frequency of the battery inverter

Question 4

Compressed air energy storage (CAES) stores energy in what form?

Accepted Answer

Mechanical energy as compressed air in underground caverns or pressure vessels

Answer

Electrical energy in large capacitor banks

Answer

Thermal energy in high-temperature molten salt

Answer

Chemical energy in hydrogen gas cylinders

Question 5

'Capacity fade' in a battery energy storage system describes:

Accepted Answer

The gradual reduction of total energy capacity over time and cycling

Answer

The decrease in battery voltage during deep discharge

Answer

The drop in power output during cold weather operation

Answer

The rapid discharge that occurs when a battery is short-circuited

Question 6

Compared to lithium-ion batteries, lead-acid batteries generally have:

Accepted Answer

Lower upfront cost but shorter cycle life and lower energy density

Answer

Higher energy density and longer cycle life

Answer

Higher round-trip efficiency and greater temperature tolerance

Answer

Lower maintenance requirements and faster charge rates

Question 7

A 'virtual power plant' (VPP) in the context of distributed energy storage refers to:

Accepted Answer

A network of distributed energy resources aggregated and controlled as a single entity for grid services

Answer

A simulated power plant used for training ESCO engineers

Answer

A software model that predicts building energy consumption

Answer

A microgrid that operates entirely off-grid using renewable energy