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How to Properly Protect a BESS Power Circuit from Overcurrents

In a battery energy storage system (BESS), circuit protection becomes necessary when each of the levels--from the cells to the racks--form a combination of energy.

The advantages fuses bring to a BESS are immense. Without a need for complex wiring or additional components, fuses are a great way to protect a system simply and cost-effectively. Fuses can be easily replaced without the accumulation of additional downtime. BESS fuses’ low watt loss prevents energy loss, which efficiently minimizes wasted power from components. Their compact size makes designing high-energy density systems possible. BESS fuses have a dc-breaking capacity of up to 250 kA (or potentially more) at 1500 V dc, which enables the design of a long-duration BESS, but have a low minimum breaking capacity that offers protection for lower fault-current levels. All in all, fuses are a win for a BESS.

Circuit protection must be adequately sized to prevent catastrophic failure. The optimal circuit protection component to use depends on the

system voltage,
system nominal current,
time constant,
withstand rating of the interconnecting components,
ambient conditions, and
location of the component within the system.

This paper discusses the different fault-prone points of a BESS, and how to adequately size the fuse for optimal overcurrent protection.

Download the paper here.

For more information on how to safeguard a BESS, visit: Littelfuse.com/BESS

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