On-grid or grid-tie solar systems are by far the most common and widely used by homes and businesses. These systems do not need batteries and use common solar inverters and are connected to the public electricity grid. Any excess solar power that you generate is exported to the electricity grid and you usually get paid a feed-in-tariff (FiT) or credits for the energy you export. It helps to get up to zero electricity bills.
Features & Benefits
Export excess solar power back to utility grid
Generated power has the advantage of effective utilization because of no storage losses involved
Hybrid solar systems generate power in the same way as a common grid-tie solar system but use special hybrid inverters and batteries to store energy for later use. This ability to store energy enables most hybrid systems to also operate as a backup power supply during a blackout, similar to a UPS system.
Traditionally the term hybrid referred to two generation sources such as wind and solar but in the solar world the term 'hybrid' refers to a combination of solar and energy storage which is also connected to the electricity grid.
Hybrid System Advantages
Allows you to store excess solar or low cost (off-peak) electricity.
Allows use of stored solar energy during peak evening times (known as self-use or load-shifting)
Most hybrid inverters have backup power capability.
Reduces power consumption from the grid (reduced demand)
Enables advanced energy management (ie. peak shaving)
A stand-alone power system (SAPS or SPS), also known as remote area power supply (RAPS), is an off-the-grid electricity system for locations that are not fitted with an electricity distribution system. Typical SAPS include one or more methods of electricity generation, energy storage, and regulation.
Storage is typically implemented as a battery bank, but other solutions exist including fuel cells. Power drawn directly from the battery will be direct current extra low voltage (DC ELV), and this is used especially for lighting as well as for DC appliances. An inverter is used to generate AC low voltage, which more typical appliances can be used with.
Electricity is typically generated by one or more of the following methods: