Design a model of the water pump using solar power

Abstract

The key content of this paper is about the design of water pumping model using PV solar cells to serve for production, irrigation and everyday living for rural residents in Mekong Delta. This system can be used in dual-mode operation, with and without timer. The authors have used microcontroller PIC18F4550-40 to read the input current flow from ACS756-50 sensor, and the input, output voltage from the potentiometer, the temperature of the battery from LM35 sensor to control all Commutation frequency of the MOSFET power circuit, closing/opening of the Relay. Voltage, battery capacity, temperature, time diaphragm are calculated and displayed on the LCD. Besides, the circuits also have capacitors and IC 7812 voltage regulator which are used for stablizing the voltage source, and the other capacitors are used to compensate for voltage drops in order to make the circuit stable.

Experimental results show that the model works quite stably and effectively. The input voltage of solar panels is changing continuously from 14V to 18V dependent on the radiation intensity of sun which shines down the PV. However, the output voltage has not changed dramatically from 24V to 26V. With the experiments, it can be seen the output voltage of the circuit which charges the battery is more stable than that of the pump since the model power is more than the battery power capacity. If the voltage from the battery which supplies to pump decreases through RELAY from 24V to 22V, it will stop working.