A base transceiver station site has a load of 1000W (@ 48VDC) and has 3 - 200Ah

Question

A base transceiver station site has a load of 1000W (@ 48VDC) and has 3 - 200Ah (@ 10hr discharge rate) battery strings in parallel. Assume a Peukerts constant of 1.2

a) How much of a battery’s charge is discharged by a current of 0.33C in 1 hr? b) How long can the fully charged battery bank carry the BTS load to reach a %DOD of 60% ?

c) The battery bank requires charging at 0.2C. What is the total load on the generator during bulk charging? Use 50VDC as the voltage during battery charge for this calculation

Explanation / Answer

(c) Dc supply = 50V

battery bank requires charging 0.2C

Q = 0.2C

V=QC

C = V/Q

C=50/0.2 = 250F

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