An on-grid or grid-tie solar photovoltaic system is when your solar photovoltaic system is connected to a utility source or electrical service provider. You pay for the amount of electricity you consume to the utility provider. Grid-tie solar systems use inverters that meet the requirements of the utility and must not emit noise that can interfere with electrical devices such as reception for television and must retain acceptable levels of harmonic distortion for quality of voltage and current output waveforms. On-grid solar systems are advantageous as the electricity is utilized by the owner during the day and any surplus is supplied to the grid; some utilities pay for this surplus electricity at a higher rate known as a Feed In Tariff (FIT). During the evenings, when solar electricity is not generated, electricity is drawn from the grid avoiding the need for costly battery banks.
On-Grid Systems are solar pv systems that only generate power when the utility power grid is available. They must connect to the grid to function. They can send excess power generated back to the grid when you are overproducing so you credit it for later use.
These are are simplest systems and the most cost effective to install.
These do not provide power during a grid outage.
They are cost effective enough to pay for themselves and put money in your pocket long term. If you want to reduce your electric bill and your carbon footprint this is a good choice.