A PV-array system is intended to charge batteries for an off-the-grid, stand-alone system, at a house in Mungule. Everyt

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A Pv Array System Is Intended To Charge Batteries For An Off The Grid Stand Alone System At A House In Mungule Everyt 1 (64.36 KiB) Viewed 18 times

A PV-array system is intended to charge batteries for an off-the-grid, stand-alone system, at a house in Mungule. Everything in the house, as given in Table Ass 4, is planned to run on 240 Vac. The system will use AstroPower APex 90-W modules with DC-STC-rated current of 5.3 A and rated voltage of 17.1 V. The worst solar month is June which has 4.5 hrs of peak sun. Table Ass 4: House appliances Power rating (W) Appliance 1 One 100-litre fridge 2 One 1000-W microwave oven 3 Six 5-W LED lamps 4 One 32-in colour TV 5 One DSTV satellite system 6 One Laptop computer 7 8 Horizontal axis washing machine 9 A Deep-well water pump Six phone charging units 150 (800 Wh/day) As given As given 150 (On) 8 (standby) 15 (On) 12 (Standby) 20 3 250 100 Time of use/day 24 hr 12 minutes 4 hr 4 hr 20 hr 4 hr 20 hr 6 hr All day 0.5 hr (or 3.5 hr/week) Delivers 420 litres at 4 litres/min (i) What is the total energy per day needed by the appliances? [30 marks] (ii) Select an appropriate system de voltage. [10 marks] (iii) How many Ah/day would the battery bank have to deliver if the loads are all ac provided by an 85% efficient inverter? [15 marks] (iv) How many Ah/day would have to be delivered by the batteries if the batteries have a Coulomb efficiency of 90%? [10 marks] (v) How many Ah/day should the PVs provide with a derating of 5% of PV output being lost due to dirt, etc.? [10 marks] (vi) How many modules would be needed in series and parallel? [25 marks]