Working Principle of 3.5kW/5kWh PV Energy Storage System

This 3.5kW off-grid PV energy storage system uses five 620W solar panels to generate direct current. Electricity first supplies household loads such as lighting, TV, fans and refrigerators directly. Excess power charges the 5kWh wall-mounted battery. At night, the battery discharges for domestic use, while the municipal grid serves as backup power to avoid blackouts.