An off-grid PV system has a constant daily energy demand of 100[Wh] . The system is equipped with two batteries of 12[V] and 70[Ah] . After two years of use, the capacity of the battery bank is reduced to 90% of the original value. Moreover, the minimum allowable SoC for the battery bank is 20% . Using this information answer the following questions:
A) What was the autonomy of the system when the batteries were new? Give the answer in [days] and with one decimal place.
B) What is the autonomy of the system after two years? Give the answer in [days] and with one decimal place.
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