Battery inverters are used in off-grid installations where the energy produced by solar panels in Pakistan needs to be stored in batteries and where there is no external electricity grid. These inverters generate their power grid with the appropriate waveform for your home's electrical equipment. They don't synchronize it with anything else, and as long as there's power in the sola... https://cirandas.net/zero/how-to-choose-the-right-solar-inverter-for-your-self-consumption-system