Energy Storage Systems Flashcards
7 cards from real ESCO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Energy Storage Systems flashcards as text
What is the primary financial benefit of pairing battery energy storage with solar PV in a commercial ESCO project?
Answer: Reducing demand charges by storing solar energy and dispatching it during peak demand intervals
Solar-plus-storage allows solar energy to be stored and strategically dispatched during peak demand windows, maximizing demand charge reductions.
Which NFPA standard specifically governs the installation and safety requirements for stationary energy storage systems in the US?
Answer: NFPA 855 (Standard for the Installation of Stationary Energy Storage Systems)
NFPA 855 specifically addresses the installation, operation, and safety of stationary energy storage systems including lithium-ion and other battery types.
In energy storage, 'frequency regulation' refers to:
Answer: Rapidly charging and discharging a battery to help stabilize grid frequency near 60 Hz
Frequency regulation services use storage systems to inject or absorb power rapidly to help maintain grid frequency at the standard 60 Hz.
Compressed air energy storage (CAES) stores energy in what form?
Answer: Mechanical energy as compressed air in underground caverns or pressure vessels
CAES compresses air using off-peak electricity and stores it in underground caverns or tanks, releasing it through a turbine to generate electricity on demand.
'Capacity fade' in a battery energy storage system describes:
Answer: The gradual reduction of total energy capacity over time and cycling
Capacity fade is the irreversible reduction in a battery's usable energy capacity due to chemical degradation occurring over repeated charge-discharge cycles and aging.
Compared to lithium-ion batteries, lead-acid batteries generally have:
Answer: Lower upfront cost but shorter cycle life and lower energy density
Lead-acid batteries have lower upfront costs but are significantly heavier, less energy-dense, and have shorter cycle lives than lithium-ion technologies.
A 'virtual power plant' (VPP) in the context of distributed energy storage refers to:
Answer: A network of distributed energy resources aggregated and controlled as a single entity for grid services
A VPP aggregates multiple distributed storage systems, solar arrays, or other resources into a coordinated fleet that can provide grid services like frequency regulation or demand response.