The only difference is the battery backup.
On grid and off grid solar system difference.
It works independently from the any utility power grid.
Figure 1 grid connected house image by clker free vector images from pixabay off grid power.
An off grid solar energy system is not connected to the utility grid whereas an on grid aka grid tied solar energy system is connected to the utility grid.
Your choice of an off grid system or on grid system will determine your access to electricity what equipment is needed for excess production what happens when the grid goes down and.
Off grid solar systems require specialised off grid inverters and battery systems large enough to store energy for 2 or more days.
Hybrid grid connected systems use lower cost hybrid battery inverters and only require a battery large enough to supply energy for 5 to 10 hours overnight depending on the application.
Rv solar kits are a grid example of off grid solar.
The working of the on grid system and off grid system is the same.
The benefit of this system is to generate a side income which would be very beneficial for consumers and provide incentives to switch to solar power.
However there are disadvantages because off grid systems require you to purchase back up battery which can be expensive bulky and not very environmentally friendly which defeats the purpose of going solar save money and live greener.
If we now after the failure of supply from the electricity board we have to face the dark situations after having a solar system too.
This system will create its own solar microgrid.
This drawback is converted into an advantage in the off grid solar system.
The entire electrical load will be powered by solar alone.