A grid connected system as the name suggests is the one in which your solar power system is connected to the local main grid. In this case, your loads can run on solar power as long as there is sufficient energy available from the sun during the day. Any deficit is taken care by the main utility supply. However, if the solar energy production is in excess as compared to the load requirement at that moment, the excess energy can be either stored in the batteries or can be transferred back to the utility grid for net-metering. This difference of energy can be tracked using a bi-directional net meter connected to your solar pv system.
Net metering is an agreement that allows the solar PV system owner to set off excess solar energy to the utility company or buy deficit energy from the utility company using a meter to track this energy exchange.
An off-grid solar system (off-the-grid, standalone) is the obvious alternative to one that is grid-tied. To ensure access to electricity at all times, off-grid solar systems require battery storage and a backup generator (if you live off-the-grid).
Typical off-grid solar systems require the following extra components:
Hybrid solar system combines the best of both worlds: the convenience of a grid connected system — including the ability to have power in the absence of solar & grid unavaibility — with the extra peace of mind of a battery backup for continuous uninterruptable power. This means that even during a power blackout, you still have electricity.
Hybrid Solar PV System with battery storage is much cheaper than power from diesel generators (DG Sets). Combining energy storage with a grid connection to your property, hybrid systems can provide the flexibility of being able to store the energy you generate during the day instead of feeding it back into the grid. This energy can then be used in the night instead of buying power back at a higher price.