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BESS Integration Considerations
Duration Limitations
As duration times increase land use increases as well
Li-Ion is competitive from 1-4 hours
Longer duration requires a different DER
Capital Cost Barriers
What is the magnitude of the annual demand charges?
What are the operational / maintenance and fuel costs associated with the current backup generator fleet? How often are the generators operating outside their peak efficiency windows?
Are there frequent short-term outages that impact mission critical operations that the BESS could mitigate?
How good is the power factor at the mission critical? If there are power factor challenges, how much does the utility charge for a poor power factor?
How many incoming utility feeders serve the mission critical which would potentially need to integrate with the BESS?
Fire Safety of a BESS
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Does the BESS supplier adhere to the requirements of NFPA-855?
Is the complete battery system certified to meet UL9540A, which ensures that fire will be contained within a single rack in case of a thermal event?
Has an electrolyte gas detection system been provided to detect off-gassing before a thermal event starts?
If water is used to cool a thermal event, how is the spent water disposed of (floor drain may not be suitable).
What has been provided for fire suppression? Traditional clean agents and aerosols are not effective for the containment of LIB thermal events since the explosive off-gas from the batteries needs to be exhausted, which would also exhaust these clean agents. Water deluge is the best method to cool the batteries.
