Q8) You have a small caravan in Antalya. Assume you will have 6 equivalent sun hours in the region. You decided to install an off-grid PV system to the caravan to supply their electricity demand. You have estimated the caravans electricity needs as below.
| Load | Quantity | Power per item (W) | Time of use (h) | Type |
| :--- | :--- | :--- | :--- | :--- |
| Light bulb | 2 | 20 | 3 | DC |
| TV | 1 | 100 | 2 | AC |
| Laptop | 1 | 100 | 10 | AC |
| Refrigerator | 1 | 200 | 24 | AC |
What is the total energy demand of the caravan in Wh?
What is the total power demanded by the DC loads in W?
What is the total power demanded by the AC loads in W?
You are considering to buy solar panels with the following specifications: Power output = 100 Wp, Vmpp = 16 V, Impp = 6.25 A, Voc = 18 V and Isc = 7 A. Assume that the combined efficiency for the cables, the charge controller and the battery system is 80% and that of the inverter is 90%. How much energy in Wh must the panels produce to cover the electricity demand of the caravan in one day?
Assume the panels work under MPP conditions. How many panels will be needed to produce that energy?
You will also need some energy storage. Assume that, you will mostly use the caravan on weekend, so only for 2 days of autonomy will be needed. You have seen a battery with the following specifications in a shop: battery capacity = 100 Ah, battery voltage = 12 V, maximum 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 you will be need?