Battery in a Photovoltaic Power Supply System
The useful capacity of the battery, C U (20 hours nominal capacity, as defined above, multiplied by the maximum depth of discharge) should allow for a three to five-day period of autonomy.. The cycle life of the battery (i.e., before its residual life drops below 80% of the nominal capacity) at 25°C must exceed NOC cycles when discharged down to a depth of …