LAB REORT2.docx

Equipments quantity 1 solar panel test bench 1 2

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Equipments Quantity 1. Solar Panel Test Bench 1 2. Monocrystalline Silicon Solar Panel 1 3. Data Acquisition and Control Interface 1 4. Lead-Acid Battery 1 5. Connecting leads As required for connection III. EXPERIMENTAL SETUP: i. Installed all the required modules in the EMS workstation. ii. Connected the 24V AC power supply to the Power Input of Data Acquisition and Control Interface. iii. Connected the USB port of Data Acquisition and Control Interface to USB ports of the computer and turned on the 24V AC power supply for Data Acquisition and Control Interface unit. iv. Turned on the computer and started the data acquisition software LVDAC_EMS and selected the 240V and 50Hz as operating voltage and frequency. IV. PROCEDURE: i. Connected two PV panels in series and measured the open-circuit voltage, shot-circuit current and temperature of the panel. Open-circuit voltage: 20.3V Short-circuit current: 0.117A Temperature: 28°C ii. Connected the circuit as shown in the Figure6 to obtain the E-I curve of the panel 13
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Figure 6. PV module in series iii. Measured the voltage and current by varying the load and tabulated in Table5. Table 5. Characteristics E-I curve Voltage (V) Curren t (mA) Voltage (V) Curren t (mA) Voltage (V) Curren t (mA) Voltage (V) Curren t (mA) 0.15 115 5.0 116 10 111 15 108 0.5 116 5.5 115 10.5 111 15.5 107 1.0 116 6.0 114 11 111 16 103 1.5 116 6.5 114 11.5 111 16.5 99 2.0 116 7.0 114 12 111 17 93 2.5 116 7.5 113 12.5 110 17.5 86 3 116 8.0 113 13 110 18 77 3.5 116 8.5 113 13.5 110 18.5 64 4 116 9.0 113 14 109 19 53 4.5 116 9.5 111 14.5 109 19.5 36 Temperature of the PV panel : 26.8°C iv. From the Table5, plotted the E-I curve. 14
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0 5 10 15 20 25 0 20 40 60 80 100 120 140 E-I curve Voltage (V) Current (mA) Graph 6. E-I Characteristics of 36V PV cell v. Determined the maximum power point of voltage and current using the Table5. PV module voltage at MPP: 15.5V PV module current at MPP: 107mA vi. Measured the open-circuit voltage of the lead-acid battery Open circuit voltage – 12.6V State of charge – 64% vii. Connected the lead-acid battery to the circuit as shown in Figure7. Figure 7. Lead acid battery connected to 36V PV panel viii. Connected the circuit as shown in Figure8, to observe the effect of 15
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blocking diode Figure 8. Effect of blocking diode ix. Connected the circuit as shown in Figure9, to observe the effect of blocking diode when the light is illuminated. Figure 9. Effect of blocking diode when the light is illuminated V. CONCLUSION: The open-circuit voltage is doubled due to the series connection of the two PV modules. The short-circuit current is slightly increased but not as much compared to parallel connection of PV panels. In parallel connected PV panels, short-circuit current is doubled. The polarity of the current will change, when the battery is being charged or discharged. The current will be in positive polarity, when the battery is charged and it will be in negative polarity, when the battery is discharged. Blocking diode prevents the battery to discharge during night time by acting reverse bias.
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