expanding my existing grid-tied system with battery and stand by generator.

TN Rubicon

New Member
Mar 26, 2022
I have an existing 5.3 KW grid-tied roof mounted system. This only supports my home 100% for about 4-6 hours in the summer, and when the grid goes down the PV system also goes down and i live off the generator. I'm looking to expand my PV system with additional ground mounted panels and add a battery pack (looking at the Generac Power cell). I want to integrate the new PV/battery system with my existing gird-tied system and the generator so when the grid goes down, i can live off the sun and/or battery until it is drained and then have the generator kick in. Then when the sun provides enough power, the generator would shut down. I want to do as much of the work myself to reduce cost, but need to hire a electrical engineer (EE) or other smart person to design the system and act as a technical advisor during the installation process. I live about an hour west of Knoxville TN and east of Cookville TN. If anyone has experience with this type of setup, any help would be appreciated. Also if you know of a qualified EE for hire that would be helpful also.


If I can do it, you can do it.
Feb 5, 2022
You will need a hybrid inverter capable of AC coupling. To work with your existing system, a generator, And provide backup, during a grid down situation.


Solar Addict
Jan 13, 2022
Riverside County, CA
Suitable Inverters for AC coupling and UL1741SA compliance.
Schneider Conext XW Pro

The Generac Power Cell is a good product but overall is probably going to cost more VS. using one of the above mentioned Inverters along with generic batteries like the EG4.