Auxiliary power supply loss of energy storage system

Do auxiliary loads affect the efficiency of battery electrical storage systems?

Abstract: The overall efficiency of battery electrical storage systems (BESSs) strongly depends on auxiliary loads, usually disregarded in studies concerning BESS integration in power systems.

What is the electricity cost for auxiliary loads?

The electricity cost for auxiliary loads depends on the energy consumption (kWh) and the pricing structure set by independent system operators or utilities. For example: In ERCOT, the BESS auxiliary load must be metered separately from energy used for battery charging and is charged at the retail rate.

What is auxiliaries consumption?

The auxiliaries consumption is the energy used for managing the system. This may be fans, air conditioning, electronic devices, lights, or any other energy consumption which has to be deduced from the PV produced energy to be sold to the grid. Auxiliaries losses in the simulation

Who is responsible for auxiliary power supply costs?

The cost of the auxiliary power supply circuit and any required backup power sources must be accounted for in the project's capital expenditures. Project owners are also responsible for the electricity costs associated with the BESS auxiliary load during operation.

What is the rated voltage of auxiliary power supply?

For example, the rated voltage of the auxiliary power supply might be 400V, 480V, or 208V. The circuit must also be sized based on the peak auxiliary load of the selected BESS product and the specific project configuration. Each BESS product has a unique auxiliary load design and peak auxiliary load.

What are auxiliary power supplies?

This includes auxiliary power transformers, switchboards and cables. The auxiliary power supply circuit must be designed to meet the BESS product's technical requirements, which vary by product. For example, the rated voltage of the auxiliary power supply might be 400V, 480V, or 208V.