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The solar battery is designed to store excess electricity generated by your solar system during the day time and to use that electricity to power your home at night. Commercial systems can also be integrated with batteries to completely run without the support of main grids. These islanded systems work in a way such that solar power supplies the load during the day time and the batteries supply in the absence of solar. Excess solar will be used for charging the batteries in this case.
Grid-connected PV systems can have different brands of batteries depending on the size and load demand. The function of these systems are the same in any case.
The Photovoltaic(PV) modules convert sunlight directly into DC power which is then sent to the inverter to produce AC power.AC power is sent to the switchboard and then to the household appliances meeting load demand. Excess AC power is again converted to DC power(using hybrid inverter) and stored in batteries. The inverters will stop recharging the batteries until the maximum level is reached and begins to divert it back to the main grid(after converting to AC) provided there is no load demand in the house. When the solar system is not producing solar power, batteries will supply the power first and then the remaining will be taken from the main grids.
Battery systems can be added on to an existing solar system by having a battery inverter and a battery device. A battery inverter can do dual operations like converting DC power from batteries to AC power for your homes or even AC power from homes or grid to DC power for battery storage (Batteries can store only DC power). Existing solar inverters convert DC power from solar modules to AC power for your homes only.
These systems are very effective and cost-efficient provided tariffs are not manipulated and there is no or less financial benefit of selling energy back to the grid.