This is a combination of renewable and other energy sources which can be implemented to suit your specific requirements.
This is when you have a utility provider and you add a solar solution into your existing municipal system.
The solar panels run your appliances when the sun is shining, the panels also fill the batteries up whilst the sun is shining. Should you have days whereby you are unable to charge your batteries due to poor weather conditions, you are able to charge the batteries with either municipality or generator power.
This solution will also assist should the municipal supply be down.