My grid 15is system has two inverters both can operate in stand alone mode all I have to do is flip my 200 amp main grid breaker and the system automatically senses the drop out of the 60 Hz line signal and goes into stand alone mode. When it was installed I had an existing Genrac backup genny with an automatic grid disconnect breaker so my 200 amp main is tripable by remote and if the sun is shining the panels power my house 100 % grid free, at night or in the clouds the genrac kicks on its a 10la unit and easily runs my dual AC and electric stove ovens and everything else never once have I not had power when the grid is down and in rural North Texas after an ice storm that can be weeks long. Not this guy I will always have power as long as their is sun during the day and my genrac is dual fuel I’m gas grid tied and I have the older 500 gal propane from before they ran a gas line down my street. The propane is back up to the back up should the gas grid go down I have 500 gal of reserve energy. My tankless water heater is also dual fuel as is the furnace just got to adjust the Jets on each a 5 min job and open two valves shut two others easy peasy.
Nice set up.
L