I am new to the field of solar panel. I would like to install and use the electricity produced by the solar panels (through inverter) directly on the appliance, e.g. a fridge. In case of cloudy sky, I want to be able to withdraw electricity from the grid. I know of the sine wave difference between AC coming from the inverter and the grid. Do you know of any equipment to synchronize them and where to buy it?
In case of power surplus from the solar panels, I wish to direct it to charge batteries instead of passing it to the grid. Does anyone know if there is such an equipment and where to buy it?