how to install auto transfer switching system between grid tied and off grid solar system

how to install auto transfer switching system between grid tied and off grid solar system
here in this video you can watch about solar technology. There are 3 types of solar system in Pakistan
1 off grid solar system
2 on grid solar system
3 hybrid solar system
in thi video you can watch about on grid +off grid solar system
in on grid solar system we can produce energy but in load shedding on grid solar system will turn off and solar power will lose during load shedding.
in this video we are using auto transfer switch between off grid solar system and on grid solar system to get solar power in load shedding.
so there is auto transfer switch of mora company .this swtich is for switching solar panels between on grid and off grid solar system.
we are using 10 kw on grid growatt solar inverter.1.2 kw inverex veron 2 off grid solar inverter.
in case of wapda on grid inverter will feed the grid and in case of load shedding on grid inverter will off and off grid inverter will attach to solar panels automatically and give solar energy.so if you want to learn how to install auto transfer switch so complete watch this video you will know much more.