Analysis of energy storage field scale calculation method

How is energy storage capacity calculated?

The energy storage capacity, E, is calculated using the efficiency calculated above to represent energy losses in the BESS itself. This is an approximation since actual battery efficiency will depend on operating parameters such as charge/discharge rate (Amps) and temperature.

Can FEMP assess battery energy storage system performance?

This report describes development of an effort to assess Battery Energy Storage System (BESS) performance that the U.S. Department of Energy (DOE) Federal Energy Management Program (FEMP) and others can employ to evaluate performance of deployed BESS or solar photovoltaic (PV) +BESS systems.

How do you calculate battery efficiency?

Efficiency is the sum of energy discharged from the battery divided by sum of energy charged into the battery (i.e., kWh in/kWh out). This must be summed over a time duration of many cycles so that initial and final states of charge become less important in the calculation of the value.

How is metered PV energy delivery compared to a computer model?

That method compared actual metered PV system energy delivery with that of a computer model. The computer model used was the National Renewable Energy Laboratory’s (NREL’s) System Advisor Model (SAM). The KPIs reported are Availability (% up-time) and Performance Ratio (PR).

How do you evaluate efficiency and demonstrated capacity of a Bess sub-system?

Evaluate Efficiency and Demonstrated Capacity of the BESS sub-system using the new method of this report. Compare actual realized Utility Energy Consumption (kWh/year) and Cost ($/year) with Utility Consumption and Cost as estimated using NREL’s REopt or System Advisor Model (SAM) computer programs.

What are the KPIs of a solar PV system?

The computer model used was the National Renewable Energy Laboratory’s (NREL’s) System Advisor Model (SAM). The KPIs reported are Availability (% up-time) and Performance Ratio (PR). If the PV system output was zero or less than 5% of the model estimate, then the time interval was counted as “unavailable.”