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Navigation: Glossary

Battery Wear Cost

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Type:	Intermediate Variable
Units:	$/kWh
Symbol:	cbw

The battery wear cost is the cost of cycling energy through the storage bank. If the storage properties indicate that the storage life is limited by throughput, HOMER assumes the storage bank requires replacement when its total throughput equals its lifetime throughput. Therefore, with each kWh of throughput, the storage bank approaches its required replacement. HOMER calculates the storage wear cost using the following equation:

equations_c_bw

where:
	Crep,batt	= replacement cost of the storage bank [$]
	Nbatt	= the number of batteries in the storage bank
	Qlifetime	= the lifetime throughput of a single storage [kWh]
	ηrt	= storage roundtrip efficiency [fractional]

Tip: The storage bank's marginal cost of generation is equal to the sum of the storage wear cost and the storage energy cost.