LAB REORT2.docx

# Ii connected the 24v ac power supply to the power

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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. v. Turned off the fan, which would increase the PV panel temperature. IV. PROCEDURE: i. Measured the open-circuit voltage, short-circuit current and temperature of the single PV module (lower). Open-circuit voltage: 9.54V Short-circuit current: 94mA PV panel temperature: 45°C Percentage decrease in PV module voltage: 0.4% Percentage increase in PV module current: 0.07% ii. Connected the circuit as shown in Figure5 to determine the E-I curve of a PV module (lower). 9

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Figure 5. To determine the E-I characteristics of a PV module iii. Measured the voltage, current and power of a PV panel for a variable load and it was tabulated in Table4. Table4 .Characteristic E-I curve of a PV module Voltage (V) Current (mA) Power (W) Voltage (V) Current (mA) Power (W) 0.15 93 0.003 5.0 91 0.442 0.5 94 0.055 5.5 90 0.489 1.0 94 0.087 6.0 90 0.532 1.5 94 0.130 6.5 90 0.570 2.0 93 0.177 7.0 89 0.599 2.5 93 0.225 7.5 87 0.633 3 93 0.272 8 81 0.630 3.5 92 0.310 8.5 73 0.610 4 92 0.367 9 59 0.520 4.5 91 0.400 9.5 37 0.335 Temperature of the PV panel :42.8°C iv. From the Table4, plotted the characteristic E-I curve of the PV module in Graph4. 10
0 1 2 3 4 5 6 7 8 9 10 0 10 20 30 40 50 60 70 80 90 100 E-I Curve Voltage (V) Current (mA) Graph 4. E-I Curve of single PV module v. Plotted the power Vs voltage to determine the maximum power point on the E-I curve Percentage decrease in the PV power is 0.5% 0 1 2 3 4 5 6 7 8 9 10 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 E-I curve Voltage (V) Power (W) Graph 5. Power Vs voltage V. CONCLUSION: In this experiment, the performance of solar panel in higher temperature is compared to the performance of lower temperature. The output voltage and power of higher temperature is low compared to the lower temperature, whereas the output current is slightly high. The output power of higher temperature is decreased even with increase in current, because of the change in voltage 11

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(percentage of decrease) is higher compared to the change in current (percentage of increase). So that, change in voltage (percentage of decrease) and change in power (percentage of decrease) is almost equal. The PV panel temperature did not increase to more than 45°C due to threat of damaging the PV panel. As the temperature increases, the PV panel may get melting. So that, the higher temperature of the panel is set to 45°C and lower temperature of the panel to 41°C. 3. STORING ENERGY FROM SOLAR PANELS INTO BATTERIES I. AIM: To familiar with the energy storage for solar panels using lead-acid batteries 12
II. EQUIPMENTS REQUIRED: In the EMS workstation, these modules were used, S.No .

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