Do I need backup power for a Bess auxiliary load?

For certain projects, backup power must be provided for the BESS auxiliary load as required by the BESS supplier or fire codes. Some BESS suppliers mandate uninterrupted power to maintain the operation of thermal management systems, ensuring battery temperatures remain within desired limits to minimize degradation.

Does Bess require uninterrupted power?

Some BESS suppliers mandate uninterrupted power to maintain the operation of thermal management systems, ensuring battery temperatures remain within desired limits to minimize degradation. BESS fire safety standards, such as NFPA 855, outline minimum requirements for backup power for fire safety systems.

What if a Bess product does not meet backup power requirements?

If a BESS product cannot meet these backup power requirements as mandated by the code or the Authority Having Jurisdiction (AHJ), an external backup power source needs to be provided. Options for backup power include local distribution network feeders (if available with sufficient kVA rating) or backup generators.

Who is responsible for the electricity costs associated with Bess auxiliary loads?

Project owners are also responsible for the electricity costs associated with the BESS auxiliary load during operation. 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:

What are Bess auxiliary loads?

BESS auxiliary loads typically fall into the following three categories: ● Control and communication equipment, such as the battery management system and network switches; ● Thermal management systems, such as HVAC or chillers; ● Fire safety systems, such as fire alarms, control panels and gas ventilation systems (if present).

What is NFPA 855 backup power?

BESS fire safety standards, such as NFPA 855, outline minimum requirements for backup power for fire safety systems. For instance, NFPA 855 specifies a minimum of two hours of standby power for gas detection systems and combustible gas concentration reduction systems.