题目内容
Consider a purely grid-connected PV system, i.e. without any battery storage.The PV array efficiency is 20%, while the grid-connected inverter efficiency is 90%. Assuming a 2% loss in the cables, what is the combined efficiency of the PV system from the PV array to the grid?
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Now, since the system is not connected to the grid, the family Smith will also need some energy storage. Mr. Smith has specified that, since it is a weekend house, only 2 days of autonomy will be needed. In this case, batteries with the following specifications will be used:Battery capacity = 100 AhBattery voltage = 12 VMaximum allowed depth of discharge = 50%The system is designed to use 24 V as operating voltage. What will be the minimum needed battery capacity in Ah? How many of the specified batteries will be needed? ______
Now, since the system is not connected to the grid, the family Smith will also need some energy storage. Mr. Smith has specified that, since it is a weekend house, only 2 days of autonomy will be needed. In this case, batteries with the following specifications will be used:Battery capacity = 100 AhBattery voltage = 12 VMaximum allowed depth of discharge = 50%The system is designed to use 24 V as operating voltage. What will be the minimum needed battery capacity in Ah? ______
Mr. Smith is considering solar panels with the following specifications:Power output = 100 WpVmpp = 16 VImpp = 6.25 AVoc = 18 VIsc = 7 AAssume that the combined efficiency for the cables, the charge controller and the battery system is 90% and that of the inverter is 96%. How much energy in Wh must the panels produce to cover the electricity demand of the family Smith in one day?Assume the panels work under MPP conditions. How many panels will be needed to produce that energy? ______
Mr. Smith is considering solar panels with the following specifications:Power output = 100 WpVmpp = 16 VImpp = 6.25 AVoc = 18 VIsc = 7 AAssume that the combined efficiency for the cables, the charge controller and the battery system is 90% and that of the inverter is 96%. How much energy in Wh must the panels produce to cover the electricity demand of the family Smith in one day? ______
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