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Page 1: Chapter IV

27

JMJ Marist BrothersCollege of Engineering and TechnologyNOTRE DAME OF MARBEL UNIVERSITY

City of Koronadal, South Cotabato

Chapter IV

Hardware Testing and Results

In this chapter the results of the hardware testing and discussions relevant to the

results are presented. The data were collected and then processed in response to the

problems posed in chapter1 of this paper.

1. Testing of Solar Panel

The solar panel was set under a bright sunlight and attain about 18.76V as shown

in figure 4.1.

Figure 7. Open-circuit voltage of solar panel –18.76V

2. Testing of Charge Controller

To be able to charge the 12V battery, we need to obtain a voltage of

~14.4V since it is understood that we need a potential higher than 12V to

successfully charge the battery. After adjusting the potentiometer R9 on the

charge controller, a 14.4V was obtained.

Page 2: Chapter IV

28

JMJ Marist BrothersCollege of Engineering and TechnologyNOTRE DAME OF MARBEL UNIVERSITY

City of Koronadal, South Cotabato

3. Testing of voltage Regulator

Usingthe IC LM2575HVT-5 chip produced a constant volateg of 5. 04V.

Figure 7.3 Output Voltage produced by the voltage Regulator

The voltage regulator is able to charge a LG Optimus mobile phone connected

to it as shown in Fig. 20.

Figure 7. 4 Voltage Regulator charging a mobile phone

Charging indication

Page 3: Chapter IV

29

JMJ Marist BrothersCollege of Engineering and TechnologyNOTRE DAME OF MARBEL UNIVERSITY

City of Koronadal, South Cotabato

The charging process drawn a constant current of 0.4A which is around is around

400mA

4. Testing of Battery Level Indicator

When the battery voltage is around 12.25V, 3 LEDs are lit up. When the battery is

at a voltage level greater than 12.25V all LEDs are turned on, and this indicates

the battery is at full charge.

Figure 7. 5 Testing of the battery indicator circuit

LOAD Pin (Inventer) Pout(Inverter)

Pin (Designed

Voltage

Regulator)

Pout

(Designed

Voltage

Regulator)

LG Optimus

Mobile Phone

Iin = 0.3A

@ V= 12.16V

P= 3.783 watts

Iout = 0.2A

@ V = 5.02V

P = 1 watt

Iin = 0.2A

@ V = 12.65V

P = 2.4 watts

Iout = 0.4A

@ V= 5V

P = 2watts

Table 4.1 Power Input-Output of a Conventional (with inverter) and the proposed (with

step-down DC/DC converter) solar energy system.

Page 4: Chapter IV

30

JMJ Marist BrothersCollege of Engineering and TechnologyNOTRE DAME OF MARBEL UNIVERSITY

City of Koronadal, South Cotabato

Table 4.1 shows the power delivered by the battery to the load and the power

received by the load from the battery. These are the energies supplied by the battery to

the load through two different mediums:

1. Inverter and plugged AC phone charger.

2. Designed Voltage Regulator (DC/DC step-down switching regulator).


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