Abstract
Sizing of battery storage capacity in solar photovoltaic (PV) systems is based on required autonomy. Most often, batteries used for such energy storage systems after some time come to a state where they can no longer sustain that required autonomy. When this happens, users can only completely replace the old battery set with new ones for a follow up of required system autonomy. That leads to a waste of the remaining active capacity of the batteries in addition to the fact that disposing the old set of battery also leads to environmental challenges. Moreover, charging and using batteries at the same time is not very good for the battery state of health as this stresses up the batteries hence reducing their life span. In this system proposal, in addition to avoiding simultaneous use and charging of battery set, we give possibility of longer use of the old battery set given that it is globally an addition of battery capacity of the two parallel monitored storage sets. The switching between energy storage sources while running each as a supply source at a time was done for different loads. The control of the switches is done using the PIC16F877A microcontroller while the IRF540 MOSFETs have been used as switches. With the static or direct current loads, a switching time of 8.5 ms was obtained while 33.06 ms was obtained for inductive loads; pending on eventual impact investigation of the above switching on AC loads, the switching time of the system is good enough to maintain supply to the loads during the supply sources interchange.
Published Version
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