NABCEP Battery Storage Systems & Energy Storage

Question 1

What is the recommended maximum depth of discharge (DoD) for flooded lead-acid batteries to maximize cycle life?

Accepted Answer

50%

Answer

80%

Answer

100%

Answer

25%

Question 2

Which battery chemistry is most widely used in modern residential solar storage systems due to its high cycle life and energy density?

Accepted Answer

Lithium iron phosphate (LFP)

Answer

Flooded lead-acid

Answer

Nickel-cadmium

Answer

Valve-regulated lead-acid (VRLA)

Question 3

A battery rated at 100 Ah discharged at a 0.2C rate will be fully discharged in approximately how many hours?

Accepted Answer

5 hours

Answer

2 hours

Answer

10 hours

Answer

20 hours

Question 4

What is the primary function of a Battery Management System (BMS) in a lithium battery storage system?

Accepted Answer

Monitor cell voltage, temperature, and SOC to prevent damage

Answer

Convert DC battery power to AC for loads

Answer

Maximize solar harvest from PV arrays

Answer

Control utility interconnection relays

Question 5

In a DC-coupled battery storage system, the battery is connected at which point in the system architecture?

Accepted Answer

On the DC bus between the PV array and the inverter

Answer

On the AC output bus of the solar inverter

Answer

At the utility meter

Answer

On a separate AC subpanel

Question 6

What does 'round-trip efficiency' measure in a battery storage system?

Accepted Answer

The ratio of energy discharged to energy charged

Answer

The total number of charge/discharge cycles

Answer

The peak power output relative to rated capacity

Answer

The time required to fully charge from empty

Question 7

Which NEC article primarily governs the installation requirements for energy storage systems (ESS) in the United States?

Accepted Answer

Article 706

Answer

Article 690

Answer

Article 705

Answer

Article 480