Development of a lead-acid-battery based storage system for the micro-hydro set-up at the University of the Philippines-Los Baños

Date

3-2011

Degree

Bachelor of Science in Electrical Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Roderick L. Catriz

Committee Member

Rodolfo A. Aguirre Jr., Athena P. Lavega, Billy Jonh Q. Valdez

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Abstract

A storage system using three lead-acid batteries for the micro-hydro set-up at the University of the Philippines – Los Baños was designed and evaluated. The design was composed of three systems: the charger system, which transfers the electrical energy from the micro-hydro set-up to the batteries; the control system, which automates the charging process; and the auxiliary system, which stabilizes the entire system. The charger system used two charging methods: absorption charging and float charging. Each battery was charged consecutively to minimize the power consumption from the micro-hydro set-up. The first battery was connected to the absorption charger with an output voltage of 15.36V while the rest were connected to the float charger with an output voltage of 13.75V. The control system monitored the charge level of each battery and transfered the first battery to the float charger when it reached 80% charge. At the same time, the second battery was transferred to the absorption charger. The process repeated until all batteries reached 80% charge and were connected to the float charger. The auxiliary system was developed to protect the system from voltage spikes, reverse current surges, and over temperature. Results showed that the average absorption charging time using the design was about 16 hours from a fully discharged battery. The average percent efficiency of the storage system was found to be 45.522%. By lowering the voltage input to the charger system to 15V, the % efficiency increased to 47.085% for fully discharged batteries. And by decreasing the output impedance of the charger system, the absorption charging time will be decreased but the power draw from the micro-hydro set-up increased.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993.5 2011 E64 P34

Document Type

Thesis

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